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chromium / chromium / src / master / . / third_party / blink / renderer / modules / webgl / webgl_rendering_context_base.cc
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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.h"
#include <memory>
#include "base/numerics/checked_math.h"
#include "base/stl_util.h"
#include "build/build_config.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "gpu/command_buffer/common/capabilities.h"
#include "gpu/config/gpu_feature_info.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/renderer/bindings/modules/v8/html_canvas_element_or_offscreen_canvas.h"
#include "third_party/blink/renderer/bindings/modules/v8/webgl_any.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/frame/dactyloscoper.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/local_frame_client.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/html/canvas/html_canvas_element.h"
#include "third_party/blink/renderer/core/html/canvas/image_data.h"
#include "third_party/blink/renderer/core/html/html_image_element.h"
#include "third_party/blink/renderer/core/html/media/html_video_element.h"
#include "third_party/blink/renderer/core/imagebitmap/image_bitmap.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/layout/layout_box.h"
#include "third_party/blink/renderer/core/origin_trials/origin_trials.h"
#include "third_party/blink/renderer/core/probe/core_probes.h"
#include "third_party/blink/renderer/core/typed_arrays/array_buffer_view_helpers.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_typed_array.h"
#include "third_party/blink/renderer/core/typed_arrays/flexible_array_buffer_view.h"
#include "third_party/blink/renderer/modules/webgl/angle_instanced_arrays.h"
#include "third_party/blink/renderer/modules/webgl/ext_blend_min_max.h"
#include "third_party/blink/renderer/modules/webgl/ext_frag_depth.h"
#include "third_party/blink/renderer/modules/webgl/ext_shader_texture_lod.h"
#include "third_party/blink/renderer/modules/webgl/ext_texture_filter_anisotropic.h"
#include "third_party/blink/renderer/modules/webgl/gl_string_query.h"
#include "third_party/blink/renderer/modules/webgl/oes_element_index_uint.h"
#include "third_party/blink/renderer/modules/webgl/oes_standard_derivatives.h"
#include "third_party/blink/renderer/modules/webgl/oes_texture_float.h"
#include "third_party/blink/renderer/modules/webgl/oes_texture_float_linear.h"
#include "third_party/blink/renderer/modules/webgl/oes_texture_half_float.h"
#include "third_party/blink/renderer/modules/webgl/oes_texture_half_float_linear.h"
#include "third_party/blink/renderer/modules/webgl/oes_vertex_array_object.h"
#include "third_party/blink/renderer/modules/webgl/webgl_active_info.h"
#include "third_party/blink/renderer/modules/webgl/webgl_buffer.h"
#include "third_party/blink/renderer/modules/webgl/webgl_compressed_texture_astc.h"
#include "third_party/blink/renderer/modules/webgl/webgl_compressed_texture_etc.h"
#include "third_party/blink/renderer/modules/webgl/webgl_compressed_texture_etc1.h"
#include "third_party/blink/renderer/modules/webgl/webgl_compressed_texture_pvrtc.h"
#include "third_party/blink/renderer/modules/webgl/webgl_compressed_texture_s3tc.h"
#include "third_party/blink/renderer/modules/webgl/webgl_compressed_texture_s3tc_srgb.h"
#include "third_party/blink/renderer/modules/webgl/webgl_context_attribute_helpers.h"
#include "third_party/blink/renderer/modules/webgl/webgl_context_event.h"
#include "third_party/blink/renderer/modules/webgl/webgl_context_group.h"
#include "third_party/blink/renderer/modules/webgl/webgl_debug_renderer_info.h"
#include "third_party/blink/renderer/modules/webgl/webgl_debug_shaders.h"
#include "third_party/blink/renderer/modules/webgl/webgl_depth_texture.h"
#include "third_party/blink/renderer/modules/webgl/webgl_draw_buffers.h"
#include "third_party/blink/renderer/modules/webgl/webgl_framebuffer.h"
#include "third_party/blink/renderer/modules/webgl/webgl_lose_context.h"
#include "third_party/blink/renderer/modules/webgl/webgl_program.h"
#include "third_party/blink/renderer/modules/webgl/webgl_renderbuffer.h"
#include "third_party/blink/renderer/modules/webgl/webgl_shader.h"
#include "third_party/blink/renderer/modules/webgl/webgl_shader_precision_format.h"
#include "third_party/blink/renderer/modules/webgl/webgl_uniform_location.h"
#include "third_party/blink/renderer/modules/webgl/webgl_vertex_array_object.h"
#include "third_party/blink/renderer/modules/webgl/webgl_vertex_array_object_oes.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable_visitor.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding_macros.h"
#include "third_party/blink/renderer/platform/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/geometry/int_size.h"
#include "third_party/blink/renderer/platform/graphics/accelerated_static_bitmap_image.h"
#include "third_party/blink/renderer/platform/graphics/canvas_2d_layer_bridge.h"
#include "third_party/blink/renderer/platform/graphics/canvas_resource_provider.h"
#include "third_party/blink/renderer/platform/graphics/gpu/shared_gpu_context.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/waitable_event.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#include "third_party/blink/renderer/platform/wtf/text/string_utf8_adaptor.h"
#include "third_party/blink/renderer/platform/wtf/threading_primitives.h"
#include "third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer_contents.h"
namespace blink {
bool WebGLRenderingContextBase::webgl_context_limits_initialized_ = false;
unsigned WebGLRenderingContextBase::max_active_webgl_contexts_ = 0;
unsigned WebGLRenderingContextBase::max_active_webgl_contexts_on_worker_ = 0;
namespace {
constexpr TimeDelta kDurationBetweenRestoreAttempts = TimeDelta::FromSeconds(1);
const int kMaxGLErrorsAllowedToConsole = 256;
Mutex& WebGLContextLimitMutex() {
DEFINE_THREAD_SAFE_STATIC_LOCAL(Mutex, mutex, ());
return mutex;
}
using WebGLRenderingContextBaseSet =
HeapHashSet<WeakMember<WebGLRenderingContextBase>>;
WebGLRenderingContextBaseSet& ActiveContexts() {
DEFINE_THREAD_SAFE_STATIC_LOCAL(
ThreadSpecific<Persistent<WebGLRenderingContextBaseSet>>, active_contexts,
());
Persistent<WebGLRenderingContextBaseSet>& active_contexts_persistent =
*active_contexts;
if (!active_contexts_persistent) {
active_contexts_persistent =
MakeGarbageCollected<WebGLRenderingContextBaseSet>();
active_contexts_persistent.RegisterAsStaticReference();
}
return *active_contexts_persistent;
}
using WebGLRenderingContextBaseMap =
HeapHashMap<WeakMember<WebGLRenderingContextBase>, int>;
WebGLRenderingContextBaseMap& ForciblyEvictedContexts() {
DEFINE_THREAD_SAFE_STATIC_LOCAL(
ThreadSpecific<Persistent<WebGLRenderingContextBaseMap>>,
forcibly_evicted_contexts, ());
Persistent<WebGLRenderingContextBaseMap>&
forcibly_evicted_contexts_persistent = *forcibly_evicted_contexts;
if (!forcibly_evicted_contexts_persistent) {
forcibly_evicted_contexts_persistent =
MakeGarbageCollected<WebGLRenderingContextBaseMap>();
forcibly_evicted_contexts_persistent.RegisterAsStaticReference();
}
return *forcibly_evicted_contexts_persistent;
}
} // namespace
ScopedRGBEmulationColorMask::ScopedRGBEmulationColorMask(
WebGLRenderingContextBase* context,
GLboolean* color_mask,
DrawingBuffer* drawing_buffer)
: context_(context),
requires_emulation_(drawing_buffer->RequiresAlphaChannelToBePreserved()) {
if (requires_emulation_) {
context_->active_scoped_rgb_emulation_color_masks_++;
memcpy(color_mask_, color_mask, 4 * sizeof(GLboolean));
context_->ContextGL()->ColorMask(color_mask_[0], color_mask_[1],
color_mask_[2], false);
}
}
ScopedRGBEmulationColorMask::~ScopedRGBEmulationColorMask() {
if (requires_emulation_) {
DCHECK(context_->active_scoped_rgb_emulation_color_masks_);
context_->active_scoped_rgb_emulation_color_masks_--;
context_->ContextGL()->ColorMask(color_mask_[0], color_mask_[1],
color_mask_[2], color_mask_[3]);
}
}
void WebGLRenderingContextBase::InitializeWebGLContextLimits(
const DrawingBuffer::WebGLContextLimits& limits) {
MutexLocker locker(WebGLContextLimitMutex());
if (!webgl_context_limits_initialized_) {
// These do not change over the lifetime of the browser.
max_active_webgl_contexts_ = limits.max_active_webgl_contexts;
max_active_webgl_contexts_on_worker_ =
limits.max_active_webgl_contexts_on_worker;
webgl_context_limits_initialized_ = true;
}
}
unsigned WebGLRenderingContextBase::CurrentMaxGLContexts() {
MutexLocker locker(WebGLContextLimitMutex());
DCHECK(webgl_context_limits_initialized_);
return IsMainThread() ? max_active_webgl_contexts_
: max_active_webgl_contexts_on_worker_;
}
void WebGLRenderingContextBase::ForciblyLoseOldestContext(
const String& reason) {
WebGLRenderingContextBase* candidate = OldestContext();
if (!candidate)
return;
candidate->PrintWarningToConsole(reason);
probe::didFireWebGLWarning(candidate->canvas());
// This will call deactivateContext once the context has actually been lost.
candidate->ForceLostContext(WebGLRenderingContextBase::kSyntheticLostContext,
WebGLRenderingContextBase::kWhenAvailable);
}
WebGLRenderingContextBase* WebGLRenderingContextBase::OldestContext() {
if (ActiveContexts().IsEmpty())
return nullptr;
WebGLRenderingContextBase* candidate = *(ActiveContexts().begin());
DCHECK(!candidate->isContextLost());
for (WebGLRenderingContextBase* context : ActiveContexts()) {
DCHECK(!context->isContextLost());
if (context->ContextGL()->GetLastFlushIdCHROMIUM() <
candidate->ContextGL()->GetLastFlushIdCHROMIUM()) {
candidate = context;
}
}
return candidate;
}
WebGLRenderingContextBase* WebGLRenderingContextBase::OldestEvictedContext() {
if (ForciblyEvictedContexts().IsEmpty())
return nullptr;
WebGLRenderingContextBase* candidate = nullptr;
int generation = -1;
for (WebGLRenderingContextBase* context : ForciblyEvictedContexts().Keys()) {
if (!candidate || ForciblyEvictedContexts().at(context) < generation) {
candidate = context;
generation = ForciblyEvictedContexts().at(context);
}
}
return candidate;
}
void WebGLRenderingContextBase::ActivateContext(
WebGLRenderingContextBase* context) {
unsigned max_gl_contexts = CurrentMaxGLContexts();
unsigned removed_contexts = 0;
while (ActiveContexts().size() >= max_gl_contexts &&
removed_contexts < max_gl_contexts) {
ForciblyLoseOldestContext(
"WARNING: Too many active WebGL contexts. Oldest context will be "
"lost.");
removed_contexts++;
}
DCHECK(!context->isContextLost());
ActiveContexts().insert(context);
}
void WebGLRenderingContextBase::DeactivateContext(
WebGLRenderingContextBase* context) {
ActiveContexts().erase(context);
}
void WebGLRenderingContextBase::AddToEvictedList(
WebGLRenderingContextBase* context) {
static int generation = 0;
ForciblyEvictedContexts().Set(context, generation++);
}
void WebGLRenderingContextBase::RemoveFromEvictedList(
WebGLRenderingContextBase* context) {
ForciblyEvictedContexts().erase(context);
}
void WebGLRenderingContextBase::RestoreEvictedContext(
WebGLRenderingContextBase* context) {
// These two sets keep weak references to their contexts;
// verify that the GC already removed the |context| entries.
DCHECK(!ForciblyEvictedContexts().Contains(context));
DCHECK(!ActiveContexts().Contains(context));
unsigned max_gl_contexts = CurrentMaxGLContexts();
// Try to re-enable the oldest inactive contexts.
while (ActiveContexts().size() < max_gl_contexts &&
ForciblyEvictedContexts().size()) {
WebGLRenderingContextBase* evicted_context = OldestEvictedContext();
if (!evicted_context->restore_allowed_) {
ForciblyEvictedContexts().erase(evicted_context);
continue;
}
IntSize desired_size = DrawingBuffer::AdjustSize(
evicted_context->ClampedCanvasSize(), IntSize(),
evicted_context->max_texture_size_);
// If there's room in the pixel budget for this context, restore it.
if (!desired_size.IsEmpty()) {
ForciblyEvictedContexts().erase(evicted_context);
evicted_context->ForceRestoreContext();
}
break;
}
}
namespace {
GLint Clamp(GLint value, GLint min, GLint max) {
if (value < min)
value = min;
if (value > max)
value = max;
return value;
}
// Return true if a character belongs to the ASCII subset as defined in
// GLSL ES 1.0 spec section 3.1.
bool ValidateCharacter(unsigned char c) {
// Printing characters are valid except " $ ` @ \ ' DEL.
if (c >= 32 && c <= 126 && c != '"' && c != '$' && c != '`' && c != '@' &&
c != '\\' && c != '\'')
return true;
// Horizontal tab, line feed, vertical tab, form feed, carriage return
// are also valid.
if (c >= 9 && c <= 13)
return true;
return false;
}
bool IsPrefixReserved(const String& name) {
if (name.StartsWith("gl_") || name.StartsWith("webgl_") ||
name.StartsWith("_webgl_"))
return true;
return false;
}
// Strips comments from shader text. This allows non-ASCII characters
// to be used in comments without potentially breaking OpenGL
// implementations not expecting characters outside the GLSL ES set.
class StripComments {
public:
StripComments(const String& str)
: parse_state_(kBeginningOfLine),
source_string_(str),
length_(str.length()),
position_(0) {
Parse();
}
String Result() { return builder_.ToString(); }
private:
bool HasMoreCharacters() const { return (position_ < length_); }
void Parse() {
while (HasMoreCharacters()) {
Process(Current());
// process() might advance the position.
if (HasMoreCharacters())
Advance();
}
}
void Process(UChar);
bool Peek(UChar& character) const {
if (position_ + 1 >= length_)
return false;
character = source_string_[position_ + 1];
return true;
}
UChar Current() {
SECURITY_DCHECK(position_ < length_);
return source_string_[position_];
}
void Advance() { ++position_; }
static bool IsNewline(UChar character) {
// Don't attempt to canonicalize newline related characters.
return (character == '\n' || character == '\r');
}
void Emit(UChar character) { builder_.Append(character); }
enum ParseState {
// Have not seen an ASCII non-whitespace character yet on
// this line. Possible that we might see a preprocessor
// directive.
kBeginningOfLine,
// Have seen at least one ASCII non-whitespace character
// on this line.
kMiddleOfLine,
// Handling a preprocessor directive. Passes through all
// characters up to the end of the line. Disables comment
// processing.
kInPreprocessorDirective,
// Handling a single-line comment. The comment text is
// replaced with a single space.
kInSingleLineComment,
// Handling a multi-line comment. Newlines are passed
// through to preserve line numbers.
kInMultiLineComment
};
ParseState parse_state_;
String source_string_;
unsigned length_;
unsigned position_;
StringBuilder builder_;
};
void StripComments::Process(UChar c) {
if (IsNewline(c)) {
// No matter what state we are in, pass through newlines
// so we preserve line numbers.
Emit(c);
if (parse_state_ != kInMultiLineComment)
parse_state_ = kBeginningOfLine;
return;
}
UChar temp = 0;
switch (parse_state_) {
case kBeginningOfLine:
if (WTF::IsASCIISpace(c)) {
Emit(c);
break;
}
if (c == '#') {
parse_state_ = kInPreprocessorDirective;
Emit(c);
break;
}
// Transition to normal state and re-handle character.
parse_state_ = kMiddleOfLine;
Process(c);
break;
case kMiddleOfLine:
if (c == '/' && Peek(temp)) {
if (temp == '/') {
parse_state_ = kInSingleLineComment;
Emit(' ');
Advance();
break;
}
if (temp == '*') {
parse_state_ = kInMultiLineComment;
// Emit the comment start in case the user has
// an unclosed comment and we want to later
// signal an error.
Emit('/');
Emit('*');
Advance();
break;
}
}
Emit(c);
break;
case kInPreprocessorDirective:
// No matter what the character is, just pass it
// through. Do not parse comments in this state. This
// might not be the right thing to do long term, but it
// should handle the #error preprocessor directive.
Emit(c);
break;
case kInSingleLineComment:
// Line-continuation characters are processed before comment processing.
// Advance string if a new line character is immediately behind
// line-continuation character.
if (c == '\\') {
if (Peek(temp) && IsNewline(temp))
Advance();
}
// The newline code at the top of this function takes care
// of resetting our state when we get out of the
// single-line comment. Swallow all other characters.
break;
case kInMultiLineComment:
if (c == '*' && Peek(temp) && temp == '/') {
Emit('*');
Emit('/');
parse_state_ = kMiddleOfLine;
Advance();
break;
}
// Swallow all other characters. Unclear whether we may
// want or need to just emit a space per character to try
// to preserve column numbers for debugging purposes.
break;
}
}
static bool g_should_fail_context_creation_for_testing = false;
} // namespace
class ScopedTexture2DRestorer {
STACK_ALLOCATED();
public:
explicit ScopedTexture2DRestorer(WebGLRenderingContextBase* context)
: context_(context) {}
~ScopedTexture2DRestorer() { context_->RestoreCurrentTexture2D(); }
private:
Member<WebGLRenderingContextBase> context_;
};
class ScopedFramebufferRestorer {
STACK_ALLOCATED();
public:
explicit ScopedFramebufferRestorer(WebGLRenderingContextBase* context)
: context_(context) {}
~ScopedFramebufferRestorer() { context_->RestoreCurrentFramebuffer(); }
private:
Member<WebGLRenderingContextBase> context_;
};
class ScopedUnpackParametersResetRestore {
STACK_ALLOCATED();
public:
explicit ScopedUnpackParametersResetRestore(
WebGLRenderingContextBase* context,
bool enabled = true)
: context_(context), enabled_(enabled) {
if (enabled)
context_->ResetUnpackParameters();
}
~ScopedUnpackParametersResetRestore() {
if (enabled_)
context_->RestoreUnpackParameters();
}
private:
Member<WebGLRenderingContextBase> context_;
bool enabled_;
};
static void FormatWebGLStatusString(const StringView& gl_info,
const StringView& info_string,
StringBuilder& builder) {
if (info_string.IsEmpty())
return;
builder.Append(", ");
builder.Append(gl_info);
builder.Append(" = ");
builder.Append(info_string);
}
static String ExtractWebGLContextCreationError(
const Platform::GraphicsInfo& info) {
StringBuilder builder;
builder.Append("Could not create a WebGL context");
FormatWebGLStatusString(
"VENDOR",
info.vendor_id ? String::Format("0x%04x", info.vendor_id) : "0xffff",
builder);
FormatWebGLStatusString(
"DEVICE",
info.device_id ? String::Format("0x%04x", info.device_id) : "0xffff",
builder);
FormatWebGLStatusString("GL_VENDOR", info.vendor_info, builder);
FormatWebGLStatusString("GL_RENDERER", info.renderer_info, builder);
FormatWebGLStatusString("GL_VERSION", info.driver_version, builder);
FormatWebGLStatusString("Sandboxed", info.sandboxed ? "yes" : "no", builder);
FormatWebGLStatusString("Optimus", info.optimus ? "yes" : "no", builder);
FormatWebGLStatusString("AMD switchable", info.amd_switchable ? "yes" : "no",
builder);
FormatWebGLStatusString(
"Reset notification strategy",
String::Format("0x%04x", info.reset_notification_strategy).Utf8().data(),
builder);
FormatWebGLStatusString("ErrorMessage", info.error_message.Utf8().data(),
builder);
builder.Append('.');
return builder.ToString();
}
struct ContextProviderCreationInfo {
// Inputs.
Platform::ContextAttributes context_attributes;
Platform::GraphicsInfo* gl_info;
KURL url;
// Outputs.
std::unique_ptr<WebGraphicsContext3DProvider> created_context_provider;
bool* using_gpu_compositing;
};
static void CreateContextProviderOnMainThread(
ContextProviderCreationInfo* creation_info,
WaitableEvent* waitable_event) {
DCHECK(IsMainThread());
// Ask for gpu compositing mode when making the context. The context will be
// lost if the mode changes.
*creation_info->using_gpu_compositing =
!Platform::Current()->IsGpuCompositingDisabled();
creation_info->created_context_provider =
Platform::Current()->CreateOffscreenGraphicsContext3DProvider(
creation_info->context_attributes, creation_info->url,
creation_info->gl_info);
waitable_event->Signal();
}
static std::unique_ptr<WebGraphicsContext3DProvider>
CreateContextProviderOnWorkerThread(
Platform::ContextAttributes context_attributes,
Platform::GraphicsInfo* gl_info,
bool* using_gpu_compositing,
const KURL& url) {
WaitableEvent waitable_event;
ContextProviderCreationInfo creation_info;
creation_info.context_attributes = context_attributes;
creation_info.gl_info = gl_info;
creation_info.url = url.Copy();
creation_info.using_gpu_compositing = using_gpu_compositing;
scoped_refptr<base::SingleThreadTaskRunner> task_runner =
Thread::MainThread()->GetTaskRunner();
PostCrossThreadTask(*task_runner, FROM_HERE,
CrossThreadBind(&CreateContextProviderOnMainThread,
CrossThreadUnretained(&creation_info),
CrossThreadUnretained(&waitable_event)));
waitable_event.Wait();
return std::move(creation_info.created_context_provider);
}
bool WebGLRenderingContextBase::SupportOwnOffscreenSurface(
ExecutionContext* execution_context) {
// Using an own offscreen surface disables virtualized contexts, and this
// doesn't currently work properly, see https://crbug.com/691102.
// TODO(https://crbug.com/791755): Remove this function and related code once
// the replacement is ready.
return false;
}
std::unique_ptr<WebGraphicsContext3DProvider>
WebGLRenderingContextBase::CreateContextProviderInternal(
CanvasRenderingContextHost* host,
const CanvasContextCreationAttributesCore& attributes,
Platform::ContextType context_type,
bool* using_gpu_compositing) {
DCHECK(host);
ExecutionContext* execution_context = host->GetTopExecutionContext();
DCHECK(execution_context);
Platform::ContextAttributes context_attributes = ToPlatformContextAttributes(
attributes, context_type, SupportOwnOffscreenSurface(execution_context));
Platform::GraphicsInfo gl_info;
std::unique_ptr<WebGraphicsContext3DProvider> context_provider;
const auto& url = execution_context->Url();
if (IsMainThread()) {
// Ask for gpu compositing mode when making the context. The context will be
// lost if the mode changes.
*using_gpu_compositing = !Platform::Current()->IsGpuCompositingDisabled();
context_provider =
Platform::Current()->CreateOffscreenGraphicsContext3DProvider(
context_attributes, url, &gl_info);
} else {
context_provider = CreateContextProviderOnWorkerThread(
context_attributes, &gl_info, using_gpu_compositing, url);
}
if (context_provider && !context_provider->BindToCurrentThread()) {
context_provider = nullptr;
gl_info.error_message =
String("bindToCurrentThread failed: " + String(gl_info.error_message));
}
if (!context_provider || g_should_fail_context_creation_for_testing) {
g_should_fail_context_creation_for_testing = false;
host->HostDispatchEvent(
WebGLContextEvent::Create(event_type_names::kWebglcontextcreationerror,
ExtractWebGLContextCreationError(gl_info)));
return nullptr;
}
gpu::gles2::GLES2Interface* gl = context_provider->ContextGL();
if (!String(gl->GetString(GL_EXTENSIONS))
.Contains("GL_OES_packed_depth_stencil")) {
host->HostDispatchEvent(WebGLContextEvent::Create(
event_type_names::kWebglcontextcreationerror,
"OES_packed_depth_stencil support is required."));
return nullptr;
}
return context_provider;
}
std::unique_ptr<WebGraphicsContext3DProvider>
WebGLRenderingContextBase::CreateWebGraphicsContext3DProvider(
CanvasRenderingContextHost* host,
const CanvasContextCreationAttributesCore& attributes,
Platform::ContextType context_type,
bool* using_gpu_compositing) {
// The host might block creation of a new WebGL context despite the
// page settings; in particular, if WebGL contexts were lost one or
// more times via the GL_ARB_robustness extension.
if (host->IsWebGLBlocked()) {
host->SetContextCreationWasBlocked();
host->HostDispatchEvent(WebGLContextEvent::Create(
event_type_names::kWebglcontextcreationerror,
"Web page caused context loss and was blocked"));
return nullptr;
}
if ((context_type == Platform::kWebGL1ContextType &&
!host->IsWebGL1Enabled()) ||
(context_type == Platform::kWebGL2ContextType &&
!host->IsWebGL2Enabled()) ||
(context_type == Platform::kWebGL2ComputeContextType &&
!host->IsWebGL2Enabled())) {
host->HostDispatchEvent(WebGLContextEvent::Create(
event_type_names::kWebglcontextcreationerror,
"disabled by enterprise policy or commandline switch"));
return nullptr;
}
return CreateContextProviderInternal(host, attributes, context_type,
using_gpu_compositing);
}
void WebGLRenderingContextBase::ForceNextWebGLContextCreationToFail() {
g_should_fail_context_creation_for_testing = true;
}
ImageBitmap* WebGLRenderingContextBase::TransferToImageBitmapBase(
ScriptState* script_state) {
WebFeature feature = WebFeature::kOffscreenCanvasTransferToImageBitmapWebGL;
UseCounter::Count(ExecutionContext::From(script_state), feature);
return ImageBitmap::Create(
GetDrawingBuffer()->TransferToStaticBitmapImage(nullptr));
}
void WebGLRenderingContextBase::commit() {
int width = GetDrawingBuffer()->Size().Width();
int height = GetDrawingBuffer()->Size().Height();
if (PaintRenderingResultsToCanvas(kBackBuffer)) {
if (Host()->GetOrCreateCanvasResourceProvider(kPreferAcceleration)) {
Host()->Commit(Host()->ResourceProvider()->ProduceFrame(),
SkIRect::MakeWH(width, height));
}
}
MarkLayerComposited();
}
scoped_refptr<StaticBitmapImage>
WebGLRenderingContextBase::GetStaticBitmapImage(
std::unique_ptr<viz::SingleReleaseCallback>* out_release_callback) {
if (!GetDrawingBuffer())
return nullptr;
if (CreationAttributes().preserve_drawing_buffer)
return GetImage();
return GetDrawingBuffer()->TransferToStaticBitmapImage(out_release_callback);
}
scoped_refptr<StaticBitmapImage> WebGLRenderingContextBase::GetImage(
AccelerationHint hint) const {
if (!GetDrawingBuffer())
return nullptr;
GetDrawingBuffer()->ResolveAndBindForReadAndDraw();
// Use the drawing buffer size here instead of the canvas size to ensure that
// sizing is consistent for the GetStaticBitmapImage() result. The forced
// downsizing logic in Reshape() can lead to the drawing buffer being smaller
// than the canvas size. See https:://crbug.com/845742.
IntSize size = GetDrawingBuffer()->Size();
// Since we are grabbing a snapshot that is not for compositing, we use a
// custom resource provider. This avoids consuming compositing-specific
// resources (e.g. GpuMemoryBuffer)
std::unique_ptr<CanvasResourceProvider> resource_provider =
CanvasResourceProvider::Create(
size, CanvasResourceProvider::kAcceleratedResourceUsage,
SharedGpuContext::ContextProviderWrapper(), 0, ColorParams(),
CanvasResourceProvider::kDefaultPresentationMode,
nullptr /* canvas_resource_dispatcher */, is_origin_top_left_);
if (!resource_provider || !resource_provider->IsValid())
return nullptr;
if (!CopyRenderingResultsFromDrawingBuffer(resource_provider.get(),
kBackBuffer)) {
// copyRenderingResultsFromDrawingBuffer is expected to always succeed
// because we've explicitly created an Accelerated surface and have
// already validated it.
NOTREACHED();
return nullptr;
}
return resource_provider->Snapshot();
}
ScriptPromise WebGLRenderingContextBase::makeXRCompatible(
ScriptState* script_state) {
if (isContextLost()) {
return ScriptPromise::RejectWithDOMException(
script_state, DOMException::Create(DOMExceptionCode::kInvalidStateError,
"Context lost."));
}
if (xr_compatible_) {
// Returns a script promise resolved with undefined.
return ScriptPromise::CastUndefined(script_state);
}
if (ContextCreatedOnXRCompatibleAdapter()) {
xr_compatible_ = true;
return ScriptPromise::CastUndefined(script_state);
}
// TODO(http://crbug.com/876140) Trigger context loss and recreate on
// compatible GPU.
return ScriptPromise::RejectWithDOMException(
script_state,
DOMException::Create(
DOMExceptionCode::kNotSupportedError,
"Context is not compatible. Switching not yet implemented."));
}
bool WebGLRenderingContextBase::IsXRCompatible() {
return xr_compatible_;
}
namespace {
// Exposed by GL_ANGLE_depth_texture
static const GLenum kSupportedInternalFormatsOESDepthTex[] = {
GL_DEPTH_COMPONENT, GL_DEPTH_STENCIL,
};
// Exposed by GL_EXT_sRGB
static const GLenum kSupportedInternalFormatsEXTsRGB[] = {
GL_SRGB, GL_SRGB_ALPHA_EXT,
};
// ES3 enums supported by both CopyTexImage and TexImage.
static const GLenum kSupportedInternalFormatsES3[] = {
GL_R8, GL_RG8, GL_RGB565, GL_RGB8, GL_RGBA4,
GL_RGB5_A1, GL_RGBA8, GL_RGB10_A2, GL_RGB10_A2UI, GL_SRGB8,
GL_SRGB8_ALPHA8, GL_R8I, GL_R8UI, GL_R16I, GL_R16UI,
GL_R32I, GL_R32UI, GL_RG8I, GL_RG8UI, GL_RG16I,
GL_RG16UI, GL_RG32I, GL_RG32UI, GL_RGBA8I, GL_RGBA8UI,
GL_RGBA16I, GL_RGBA16UI, GL_RGBA32I, GL_RGBA32UI, GL_RGB32I,
GL_RGB32UI, GL_RGB8I, GL_RGB8UI, GL_RGB16I, GL_RGB16UI,
};
// ES3 enums only supported by TexImage
static const GLenum kSupportedInternalFormatsTexImageES3[] = {
GL_R8_SNORM,
GL_R16F,
GL_R32F,
GL_RG8_SNORM,
GL_RG16F,
GL_RG32F,
GL_RGB8_SNORM,
GL_R11F_G11F_B10F,
GL_RGB9_E5,
GL_RGB16F,
GL_RGB32F,
GL_RGBA8_SNORM,
GL_RGBA16F,
GL_RGBA32F,
GL_DEPTH_COMPONENT16,
GL_DEPTH_COMPONENT24,
GL_DEPTH_COMPONENT32F,
GL_DEPTH24_STENCIL8,
GL_DEPTH32F_STENCIL8,
};
// Exposed by EXT_color_buffer_float
static const GLenum kSupportedInternalFormatsCopyTexImageFloatES3[] = {
GL_R16F, GL_R32F, GL_RG16F, GL_RG32F, GL_RGB16F,
GL_RGB32F, GL_RGBA16F, GL_RGBA32F, GL_R11F_G11F_B10F};
// ES3 enums supported by TexImageSource
static const GLenum kSupportedInternalFormatsTexImageSourceES3[] = {
GL_R8, GL_R16F, GL_R32F, GL_R8UI, GL_RG8,
GL_RG16F, GL_RG32F, GL_RG8UI, GL_RGB8, GL_SRGB8,
GL_RGB565, GL_R11F_G11F_B10F, GL_RGB9_E5, GL_RGB16F, GL_RGB32F,
GL_RGB8UI, GL_RGBA8, GL_SRGB8_ALPHA8, GL_RGB5_A1, GL_RGBA4,
GL_RGBA16F, GL_RGBA32F, GL_RGBA8UI, GL_RGB10_A2,
};
// ES2 enums
// Internalformat must equal format in ES2.
static const GLenum kSupportedFormatsES2[] = {
GL_RGB, GL_RGBA, GL_LUMINANCE_ALPHA, GL_LUMINANCE, GL_ALPHA,
};
// Exposed by GL_ANGLE_depth_texture
static const GLenum kSupportedFormatsOESDepthTex[] = {
GL_DEPTH_COMPONENT, GL_DEPTH_STENCIL,
};
// Exposed by GL_EXT_sRGB
static const GLenum kSupportedFormatsEXTsRGB[] = {
GL_SRGB, GL_SRGB_ALPHA_EXT,
};
// ES3 enums
static const GLenum kSupportedFormatsES3[] = {
GL_RED, GL_RED_INTEGER, GL_RG,
GL_RG_INTEGER, GL_RGB, GL_RGB_INTEGER,
GL_RGBA, GL_RGBA_INTEGER, GL_DEPTH_COMPONENT,
GL_DEPTH_STENCIL,
};
// ES3 enums supported by TexImageSource
static const GLenum kSupportedFormatsTexImageSourceES3[] = {
GL_RED, GL_RED_INTEGER, GL_RG, GL_RG_INTEGER,
GL_RGB, GL_RGB_INTEGER, GL_RGBA, GL_RGBA_INTEGER,
};
// ES2 enums
static const GLenum kSupportedTypesES2[] = {
GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_4_4_4_4,
GL_UNSIGNED_SHORT_5_5_5_1,
};
// Exposed by GL_OES_texture_float
static const GLenum kSupportedTypesOESTexFloat[] = {
GL_FLOAT,
};
// Exposed by GL_OES_texture_half_float
static const GLenum kSupportedTypesOESTexHalfFloat[] = {
GL_HALF_FLOAT_OES,
};
// Exposed by GL_ANGLE_depth_texture
static const GLenum kSupportedTypesOESDepthTex[] = {
GL_UNSIGNED_SHORT, GL_UNSIGNED_INT, GL_UNSIGNED_INT_24_8,
};
// ES3 enums
static const GLenum kSupportedTypesES3[] = {
GL_BYTE,
GL_UNSIGNED_SHORT,
GL_SHORT,
GL_UNSIGNED_INT,
GL_INT,
GL_HALF_FLOAT,
GL_FLOAT,
GL_UNSIGNED_INT_2_10_10_10_REV,
GL_UNSIGNED_INT_10F_11F_11F_REV,
GL_UNSIGNED_INT_5_9_9_9_REV,
GL_UNSIGNED_INT_24_8,
GL_FLOAT_32_UNSIGNED_INT_24_8_REV,
};
// ES3 enums supported by TexImageSource
static const GLenum kSupportedTypesTexImageSourceES3[] = {
GL_HALF_FLOAT, GL_FLOAT, GL_UNSIGNED_INT_10F_11F_11F_REV,
GL_UNSIGNED_INT_2_10_10_10_REV,
};
} // namespace
WebGLRenderingContextBase::WebGLRenderingContextBase(
CanvasRenderingContextHost* host,
std::unique_ptr<WebGraphicsContext3DProvider> context_provider,
bool using_gpu_compositing,
const CanvasContextCreationAttributesCore& requested_attributes,
Platform::ContextType version)
: WebGLRenderingContextBase(
host,
host->GetTopExecutionContext()->GetTaskRunner(TaskType::kWebGL),
std::move(context_provider),
using_gpu_compositing,
requested_attributes,
version) {}
WebGLRenderingContextBase::WebGLRenderingContextBase(
CanvasRenderingContextHost* host,
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
std::unique_ptr<WebGraphicsContext3DProvider> context_provider,
bool using_gpu_compositing,
const CanvasContextCreationAttributesCore& requested_attributes,
Platform::ContextType context_type)
: CanvasRenderingContext(host, requested_attributes),
context_group_(MakeGarbageCollected<WebGLContextGroup>()),
dispatch_context_lost_event_timer_(
task_runner,
this,
&WebGLRenderingContextBase::DispatchContextLostEvent),
restore_timer_(task_runner,
this,
&WebGLRenderingContextBase::MaybeRestoreContext),
task_runner_(task_runner),
num_gl_errors_to_console_allowed_(kMaxGLErrorsAllowedToConsole),
context_type_(context_type) {
DCHECK(context_provider);
// TODO(http://crbug.com/876140) Make sure this is being created on a
// compatible adapter.
xr_compatible_ = requested_attributes.xr_compatible;
context_group_->AddContext(this);
max_viewport_dims_[0] = max_viewport_dims_[1] = 0;
context_provider->ContextGL()->GetIntegerv(GL_MAX_VIEWPORT_DIMS,
max_viewport_dims_);
scoped_refptr<DrawingBuffer> buffer;
buffer =
CreateDrawingBuffer(std::move(context_provider), using_gpu_compositing);
if (!buffer) {
context_lost_mode_ = kSyntheticLostContext;
return;
}
InitializeWebGLContextLimits(buffer->webgl_context_limits());
drawing_buffer_ = std::move(buffer);
GetDrawingBuffer()->Bind(GL_FRAMEBUFFER);
SetupFlags();
String disabled_webgl_extensions(GetDrawingBuffer()
->ContextProvider()
->GetGpuFeatureInfo()
.disabled_webgl_extensions.c_str());
Vector<String> disabled_extension_list;
disabled_webgl_extensions.Split(' ', disabled_extension_list);
for (const auto& entry : disabled_extension_list) {
disabled_extensions_.insert(entry);
}
#define ADD_VALUES_TO_SET(set, values) \
for (size_t i = 0; i < base::size(values); ++i) { \
set.insert(values[i]); \
}
ADD_VALUES_TO_SET(supported_internal_formats_, kSupportedFormatsES2);
ADD_VALUES_TO_SET(supported_tex_image_source_internal_formats_,
kSupportedFormatsES2);
ADD_VALUES_TO_SET(supported_internal_formats_copy_tex_image_,
kSupportedFormatsES2);
ADD_VALUES_TO_SET(supported_formats_, kSupportedFormatsES2);
ADD_VALUES_TO_SET(supported_tex_image_source_formats_, kSupportedFormatsES2);
ADD_VALUES_TO_SET(supported_types_, kSupportedTypesES2);
ADD_VALUES_TO_SET(supported_tex_image_source_types_, kSupportedTypesES2);
}
scoped_refptr<DrawingBuffer> WebGLRenderingContextBase::CreateDrawingBuffer(
std::unique_ptr<WebGraphicsContext3DProvider> context_provider,
bool using_gpu_compositing) {
bool premultiplied_alpha = CreationAttributes().premultiplied_alpha;
bool want_alpha_channel = CreationAttributes().alpha;
bool want_depth_buffer = CreationAttributes().depth;
bool want_stencil_buffer = CreationAttributes().stencil;
bool want_antialiasing = CreationAttributes().antialias;
DrawingBuffer::PreserveDrawingBuffer preserve =
CreationAttributes().preserve_drawing_buffer ? DrawingBuffer::kPreserve
: DrawingBuffer::kDiscard;
DrawingBuffer::WebGLVersion web_gl_version = DrawingBuffer::kWebGL1;
if (context_type_ == Platform::kWebGL1ContextType) {
web_gl_version = DrawingBuffer::kWebGL1;
} else if (context_type_ == Platform::kWebGL2ContextType) {
web_gl_version = DrawingBuffer::kWebGL2;
} else if (context_type_ == Platform::kWebGL2ComputeContextType) {
web_gl_version = DrawingBuffer::kWebGL2Compute;
} else {
NOTREACHED();
}
// On Mac OS, DrawingBuffer is using an IOSurface as its backing storage, this
// allows WebGL-rendered canvases to be composited by the OS rather than
// Chrome.
// IOSurfaces are only compatible with the GL_TEXTURE_RECTANGLE_ARB binding
// target. So to avoid the knowledge of GL_TEXTURE_RECTANGLE_ARB type textures
// being introduced into more areas of the code, we use the code path of
// non-WebGLImageChromium for OffscreenCanvas.
// See detailed discussion in crbug.com/649668.
DrawingBuffer::ChromiumImageUsage chromium_image_usage =
Host()->IsOffscreenCanvas() ? DrawingBuffer::kDisallowChromiumImage
: DrawingBuffer::kAllowChromiumImage;
return DrawingBuffer::Create(
std::move(context_provider), using_gpu_compositing, this,
ClampedCanvasSize(), premultiplied_alpha, want_alpha_channel,
want_depth_buffer, want_stencil_buffer, want_antialiasing, preserve,
web_gl_version, chromium_image_usage, ColorParams());
}
void WebGLRenderingContextBase::InitializeNewContext() {
DCHECK(!isContextLost());
DCHECK(GetDrawingBuffer());
// TODO(http://crbug.com/876140) Does compatible_xr_device needs to be taken
// into account here?
marked_canvas_dirty_ = false;
must_paint_to_canvas_ = false;
active_texture_unit_ = 0;
pack_alignment_ = 4;
unpack_alignment_ = 4;
unpack_flip_y_ = false;
unpack_premultiply_alpha_ = false;
unpack_colorspace_conversion_ = GC3D_BROWSER_DEFAULT_WEBGL;
bound_array_buffer_ = nullptr;
current_program_ = nullptr;
framebuffer_binding_ = nullptr;
renderbuffer_binding_ = nullptr;
depth_mask_ = true;
stencil_enabled_ = false;
stencil_mask_ = 0xFFFFFFFF;
stencil_mask_back_ = 0xFFFFFFFF;
stencil_func_ref_ = 0;
stencil_func_ref_back_ = 0;
stencil_func_mask_ = 0xFFFFFFFF;
stencil_func_mask_back_ = 0xFFFFFFFF;
num_gl_errors_to_console_allowed_ = kMaxGLErrorsAllowedToConsole;
clear_color_[0] = clear_color_[1] = clear_color_[2] = clear_color_[3] = 0;
scissor_enabled_ = false;
clear_depth_ = 1;
clear_stencil_ = 0;
color_mask_[0] = color_mask_[1] = color_mask_[2] = color_mask_[3] = true;
GLint num_combined_texture_image_units = 0;
ContextGL()->GetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS,
&num_combined_texture_image_units);
texture_units_.clear();
texture_units_.resize(num_combined_texture_image_units);
GLint num_vertex_attribs = 0;
ContextGL()->GetIntegerv(GL_MAX_VERTEX_ATTRIBS, &num_vertex_attribs);
max_vertex_attribs_ = num_vertex_attribs;
max_texture_size_ = 0;
ContextGL()->GetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size_);
max_texture_level_ =
WebGLTexture::ComputeLevelCount(max_texture_size_, max_texture_size_, 1);
max_cube_map_texture_size_ = 0;
ContextGL()->GetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE,
&max_cube_map_texture_size_);
max3d_texture_size_ = 0;
max3d_texture_level_ = 0;
max_array_texture_layers_ = 0;
if (IsWebGL2OrHigher()) {
ContextGL()->GetIntegerv(GL_MAX_3D_TEXTURE_SIZE, &max3d_texture_size_);
max3d_texture_level_ = WebGLTexture::ComputeLevelCount(
max3d_texture_size_, max3d_texture_size_, max3d_texture_size_);
ContextGL()->GetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS,
&max_array_texture_layers_);
}
max_cube_map_texture_level_ = WebGLTexture::ComputeLevelCount(
max_cube_map_texture_size_, max_cube_map_texture_size_, 1);
max_renderbuffer_size_ = 0;
ContextGL()->GetIntegerv(GL_MAX_RENDERBUFFER_SIZE, &max_renderbuffer_size_);
// These two values from EXT_draw_buffers are lazily queried.
max_draw_buffers_ = 0;
max_color_attachments_ = 0;
back_draw_buffer_ = GL_BACK;
read_buffer_of_default_framebuffer_ = GL_BACK;
default_vertex_array_object_ = WebGLVertexArrayObject::Create(
this, WebGLVertexArrayObjectBase::kVaoTypeDefault);
bound_vertex_array_object_ = default_vertex_array_object_;
vertex_attrib_type_.resize(max_vertex_attribs_);
ContextGL()->Viewport(0, 0, drawingBufferWidth(), drawingBufferHeight());
scissor_box_[0] = scissor_box_[1] = 0;
scissor_box_[2] = drawingBufferWidth();
scissor_box_[3] = drawingBufferHeight();
ContextGL()->Scissor(scissor_box_[0], scissor_box_[1], scissor_box_[2],
scissor_box_[3]);
GetDrawingBuffer()->ContextProvider()->SetLostContextCallback(
WTF::BindRepeating(&WebGLRenderingContextBase::ForceLostContext,
WrapWeakPersistent(this),
WebGLRenderingContextBase::kRealLostContext,
WebGLRenderingContextBase::kAuto));
GetDrawingBuffer()->ContextProvider()->SetErrorMessageCallback(
WTF::BindRepeating(&WebGLRenderingContextBase::OnErrorMessage,
WrapWeakPersistent(this)));
// If the context has the flip_y extension, it will behave as having the
// origin of coordinates on the top left.
is_origin_top_left_ = GetDrawingBuffer()
->ContextProvider()
->GetCapabilities()
.mesa_framebuffer_flip_y;
// If WebGL 2, the PRIMITIVE_RESTART_FIXED_INDEX should be always enabled.
// See the section <Primitive Restart is Always Enabled> in WebGL 2 spec:
// https://www.khronos.org/registry/webgl/specs/latest/2.0/#4.1.4
if (IsWebGL2OrHigher())
ContextGL()->Enable(GL_PRIMITIVE_RESTART_FIXED_INDEX);
// This ensures that the context has a valid "lastFlushID" and won't be
// mistakenly identified as the "least recently used" context.
ContextGL()->Flush();
for (int i = 0; i < kWebGLExtensionNameCount; ++i)
extension_enabled_[i] = false;
is_web_gl2_formats_types_added_ = false;
is_web_gl2_tex_image_source_formats_types_added_ = false;
is_web_gl2_internal_formats_copy_tex_image_added_ = false;
is_oes_texture_float_formats_types_added_ = false;
is_oes_texture_half_float_formats_types_added_ = false;
is_web_gl_depth_texture_formats_types_added_ = false;
is_ext_srgb_formats_types_added_ = false;
is_ext_color_buffer_float_formats_added_ = false;
supported_internal_formats_.clear();
ADD_VALUES_TO_SET(supported_internal_formats_, kSupportedFormatsES2);
supported_tex_image_source_internal_formats_.clear();
ADD_VALUES_TO_SET(supported_tex_image_source_internal_formats_,
kSupportedFormatsES2);
supported_internal_formats_copy_tex_image_.clear();
ADD_VALUES_TO_SET(supported_internal_formats_copy_tex_image_,
kSupportedFormatsES2);
supported_formats_.clear();
ADD_VALUES_TO_SET(supported_formats_, kSupportedFormatsES2);
supported_tex_image_source_formats_.clear();
ADD_VALUES_TO_SET(supported_tex_image_source_formats_, kSupportedFormatsES2);
supported_types_.clear();
ADD_VALUES_TO_SET(supported_types_, kSupportedTypesES2);
supported_tex_image_source_types_.clear();
ADD_VALUES_TO_SET(supported_tex_image_source_types_, kSupportedTypesES2);
// The DrawingBuffer was unable to store the state that dirtied when it was
// initialized. Restore it now.
GetDrawingBuffer()->RestoreAllState();
ActivateContext(this);
}
void WebGLRenderingContextBase::SetupFlags() {
DCHECK(GetDrawingBuffer());
if (canvas()) {
if (Page* p = canvas()->GetDocument().GetPage()) {
synthesized_errors_to_console_ =
p->GetSettings().GetWebGLErrorsToConsoleEnabled();
}
}
is_depth_stencil_supported_ =
ExtensionsUtil()->IsExtensionEnabled("GL_OES_packed_depth_stencil");
}
void WebGLRenderingContextBase::AddCompressedTextureFormat(GLenum format) {
if (!compressed_texture_formats_.Contains(format))
compressed_texture_formats_.push_back(format);
}
void WebGLRenderingContextBase::RemoveAllCompressedTextureFormats() {
compressed_texture_formats_.clear();
}
// Helper function for V8 bindings to identify what version of WebGL a
// CanvasRenderingContext supports.
unsigned WebGLRenderingContextBase::GetWebGLVersion(
const CanvasRenderingContext* context) {
if (!context->Is3d())
return 0;
return static_cast<const WebGLRenderingContextBase*>(context)->ContextType();
}
WebGLRenderingContextBase::~WebGLRenderingContextBase() {
// It's forbidden to refer to other GC'd objects in a GC'd object's
// destructor. It's useful for DrawingBuffer to guarantee that it
// calls its DrawingBufferClient during its own destruction, but if
// the WebGL context is also being destroyed, then it's essential
// that the DrawingBufferClient methods not try to touch other
// objects like WebGLTextures that were previously hooked into the
// context state.
destruction_in_progress_ = true;
// Now that the context and context group no longer hold on to the
// objects they create, and now that the objects are eagerly finalized
// rather than the context, there is very little useful work that this
// destructor can do, since it's not allowed to touch other on-heap
// objects. All it can do is destroy its underlying context, which, if
// there are no other contexts in the same share group, will cause all of
// the underlying graphics resources to be deleted. (Currently, it's
// always the case that there are no other contexts in the same share
// group -- resource sharing between WebGL contexts is not yet
// implemented, and due to its complex semantics, it's doubtful that it
// ever will be.)
DestroyContext();
// Now that this context is destroyed, see if there's a
// previously-evicted one that should be restored.
RestoreEvictedContext(this);
}
void WebGLRenderingContextBase::DestroyContext() {
if (!GetDrawingBuffer())
return;
extensions_util_.reset();
base::RepeatingClosure null_closure;
base::RepeatingCallback<void(const char*, int32_t)> null_function;
GetDrawingBuffer()->ContextProvider()->SetLostContextCallback(
std::move(null_closure));
GetDrawingBuffer()->ContextProvider()->SetErrorMessageCallback(
std::move(null_function));
DCHECK(GetDrawingBuffer());
drawing_buffer_->BeginDestruction();
drawing_buffer_ = nullptr;
}
void WebGLRenderingContextBase::MarkContextChanged(
ContentChangeType change_type) {
if (isContextLost())
return;
if (framebuffer_binding_) {
framebuffer_binding_->SetContentsChanged(true);
return;
}
// Regardless of whether dirty propagations are optimized away, the back
// buffer is now out of sync with respect to the canvas's internal backing
// store -- which is only used for certain purposes, like printing.
must_paint_to_canvas_ = true;
if (!GetDrawingBuffer()->MarkContentsChanged() && marked_canvas_dirty_) {
return;
}
if (Host()->IsOffscreenCanvas()) {
marked_canvas_dirty_ = true;
DidDraw();
return;
}
if (!canvas())
return;
if (!marked_canvas_dirty_) {
marked_canvas_dirty_ = true;
LayoutBox* layout_box = canvas()->GetLayoutBox();
if (layout_box && layout_box->HasAcceleratedCompositing()) {
layout_box->ContentChanged(change_type);
}
IntSize canvas_size = ClampedCanvasSize();
DidDraw(SkIRect::MakeXYWH(0, 0, canvas_size.Width(), canvas_size.Height()));
}
}
void WebGLRenderingContextBase::DidDraw(const SkIRect& dirty_rect) {
MarkContextChanged(kCanvasChanged);
CanvasRenderingContext::DidDraw(dirty_rect);
}
void WebGLRenderingContextBase::DidDraw() {
MarkContextChanged(kCanvasChanged);
CanvasRenderingContext::DidDraw();
}
void WebGLRenderingContextBase::PushFrame() {
int width = GetDrawingBuffer()->Size().Width();
int height = GetDrawingBuffer()->Size().Height();
if (PaintRenderingResultsToCanvas(kBackBuffer)) {
if (Host()->GetOrCreateCanvasResourceProvider(kPreferAcceleration)) {
Host()->PushFrame(Host()->ResourceProvider()->ProduceFrame(),
SkIRect::MakeWH(width, height));
}
}
MarkLayerComposited();
}
void WebGLRenderingContextBase::FinalizeFrame() {
marked_canvas_dirty_ = false;
}
void WebGLRenderingContextBase::OnErrorMessage(const char* message,
int32_t id) {
if (synthesized_errors_to_console_)
PrintGLErrorToConsole(message);
probe::didFireWebGLErrorOrWarning(canvas(), message);
}
WebGLRenderingContextBase::HowToClear
WebGLRenderingContextBase::ClearIfComposited(GLbitfield mask) {
if (isContextLost())
return kSkipped;
GLbitfield buffers_needing_clearing =
GetDrawingBuffer()->GetBuffersToAutoClear();
if (buffers_needing_clearing == 0 || (mask && framebuffer_binding_))
return kSkipped;
WebGLContextAttributes* context_attributes = getContextAttributes();
if (!context_attributes) {
// Unlikely, but context was lost.
return kSkipped;
}
// Determine if it's possible to combine the clear the user asked for and this
// clear.
bool combined_clear = mask && !scissor_enabled_;
ContextGL()->Disable(GL_SCISSOR_TEST);
if (combined_clear && (mask & GL_COLOR_BUFFER_BIT)) {
ContextGL()->ClearColor(color_mask_[0] ? clear_color_[0] : 0,
color_mask_[1] ? clear_color_[1] : 0,
color_mask_[2] ? clear_color_[2] : 0,
color_mask_[3] ? clear_color_[3] : 0);
} else {
ContextGL()->ClearColor(0, 0, 0, 0);
}
ContextGL()->ColorMask(
true, true, true,
!GetDrawingBuffer()->RequiresAlphaChannelToBePreserved());
GLbitfield clear_mask = GL_COLOR_BUFFER_BIT;
if (context_attributes->depth()) {
if (!combined_clear || !depth_mask_ || !(mask & GL_DEPTH_BUFFER_BIT))
ContextGL()->ClearDepthf(1.0f);
clear_mask |= GL_DEPTH_BUFFER_BIT;
ContextGL()->DepthMask(true);
}
if (context_attributes->stencil() ||
GetDrawingBuffer()->HasImplicitStencilBuffer()) {
if (combined_clear && (mask & GL_STENCIL_BUFFER_BIT))
ContextGL()->ClearStencil(clear_stencil_ & stencil_mask_);
else
ContextGL()->ClearStencil(0);
clear_mask |= GL_STENCIL_BUFFER_BIT;
ContextGL()->StencilMaskSeparate(GL_FRONT, 0xFFFFFFFF);
}
ContextGL()->ColorMask(
true, true, true,
!GetDrawingBuffer()->DefaultBufferRequiresAlphaChannelToBePreserved());
// If the WebGL 2.0 clearBuffer APIs already have been used to
// selectively clear some of the buffers, don't destroy those
// results.
GetDrawingBuffer()->ClearFramebuffers(clear_mask & buffers_needing_clearing);
// Call the DrawingBufferClient method to restore scissor test, mask, and
// clear values, because we dirtied them above.
DrawingBufferClientRestoreScissorTest();
DrawingBufferClientRestoreMaskAndClearValues();
GetDrawingBuffer()->SetBuffersToAutoClear(0);
return combined_clear ? kCombinedClear : kJustClear;
}
void WebGLRenderingContextBase::MarkCompositedAndClearBackbufferIfNeeded() {
MarkLayerComposited();
ClearIfComposited();
}
void WebGLRenderingContextBase::RestoreScissorEnabled() {
if (isContextLost())
return;
if (scissor_enabled_) {
ContextGL()->Enable(GL_SCISSOR_TEST);
} else {
ContextGL()->Disable(GL_SCISSOR_TEST);
}
}
void WebGLRenderingContextBase::RestoreScissorBox() {
if (isContextLost())
return;
ContextGL()->Scissor(scissor_box_[0], scissor_box_[1], scissor_box_[2],
scissor_box_[3]);
}
void WebGLRenderingContextBase::RestoreClearColor() {
if (isContextLost())
return;
ContextGL()->ClearColor(clear_color_[0], clear_color_[1], clear_color_[2],
clear_color_[3]);
}
void WebGLRenderingContextBase::RestoreColorMask() {
if (isContextLost())
return;
ContextGL()->ColorMask(color_mask_[0], color_mask_[1], color_mask_[2],
color_mask_[3]);
}
void WebGLRenderingContextBase::MarkLayerComposited() {
if (!isContextLost())
GetDrawingBuffer()->ResetBuffersToAutoClear();
}
bool WebGLRenderingContextBase::IsOriginTopLeft() const {
if (isContextLost())
return false;
return is_origin_top_left_;
}
void WebGLRenderingContextBase::SetIsHidden(bool hidden) {
is_hidden_ = hidden;
if (GetDrawingBuffer())
GetDrawingBuffer()->SetIsHidden(hidden);
if (!hidden && isContextLost() && restore_allowed_ &&
auto_recovery_method_ == kAuto) {
DCHECK(!restore_timer_.IsActive());
restore_timer_.StartOneShot(TimeDelta(), FROM_HERE);
}
}
bool WebGLRenderingContextBase::PaintRenderingResultsToCanvas(
SourceDrawingBuffer source_buffer) {
if (isContextLost())
return false;
bool must_clear_now = ClearIfComposited() != kSkipped;
if (!must_paint_to_canvas_ && !must_clear_now)
return false;
must_paint_to_canvas_ = false;
if (Host()->ResourceProvider() &&
Host()->ResourceProvider()->Size() != GetDrawingBuffer()->Size()) {
Host()->DiscardResourceProvider();
}
if (!Host()->GetOrCreateCanvasResourceProvider(kPreferAcceleration))
return false;
ScopedTexture2DRestorer restorer(this);
ScopedFramebufferRestorer fbo_restorer(this);
GetDrawingBuffer()->ResolveAndBindForReadAndDraw();
if (!CopyRenderingResultsFromDrawingBuffer(Host()->ResourceProvider(),
source_buffer)) {
// Currently, CopyRenderingResultsFromDrawingBuffer is expected to always
// succeed because cases where canvas()-buffer() is not accelerated are
// handled before reaching this point. If that assumption ever stops
// holding true, we may need to implement a fallback right here.
NOTREACHED();
return false;
}
return true;
}
void WebGLRenderingContextBase::ProvideBackBufferToResourceProvider() const {
if (isContextLost())
return;
DCHECK(Host()->ResourceProvider());
if (Host()->ResourceProvider()->Size() != GetDrawingBuffer()->Size())
Host()->DiscardResourceProvider();
CanvasResourceProvider* resource_provider =
Host()->GetOrCreateCanvasResourceProvider(kPreferAcceleration);
if (!resource_provider || !resource_provider->IsAccelerated())
return;
resource_provider->ImportResource(
GetDrawingBuffer()->AsCanvasResource(resource_provider->CreateWeakPtr()));
}
bool WebGLRenderingContextBase::ContextCreatedOnXRCompatibleAdapter() {
// TODO(http://crbug.com/876140) Determine if device is compatible with
// current context.
return true;
}
bool WebGLRenderingContextBase::CopyRenderingResultsFromDrawingBuffer(
CanvasResourceProvider* resource_provider,
SourceDrawingBuffer source_buffer) const {
if (!drawing_buffer_)
return false;
if (resource_provider->IsAccelerated()) {
base::WeakPtr<WebGraphicsContext3DProviderWrapper> shared_context_wrapper =
SharedGpuContext::ContextProviderWrapper();
if (!shared_context_wrapper)
return false;
gpu::gles2::GLES2Interface* gl =
shared_context_wrapper->ContextProvider()->ContextGL();
GLuint texture_id =
resource_provider->GetBackingTextureHandleForOverwrite();
if (!texture_id)
return false;
// TODO(xlai): Flush should not be necessary if the synchronization in
// CopyToPlatformTexture is done correctly. See crbug.com/794706.
gl->Flush();
bool flip_y = is_origin_top_left_ && !canvas()->LowLatencyEnabled();
return drawing_buffer_->CopyToPlatformTexture(
gl, GL_TEXTURE_2D, texture_id, true, flip_y,
IntPoint(0, 0), IntRect(IntPoint(0, 0), drawing_buffer_->Size()),
source_buffer);
}
// Note: This code path could work for all cases. The only reason there
// is a separate path for the accelerated case is that we assume texture
// copying is faster than drawImage.
scoped_refptr<StaticBitmapImage> image = GetImage(kPreferAcceleration);
if (!image)
return false;
cc::PaintFlags paint_flags;
paint_flags.setBlendMode(SkBlendMode::kSrc);
resource_provider->Canvas()->drawImage(image->PaintImageForCurrentFrame(), 0,
0, &paint_flags);
return true;
}
IntSize WebGLRenderingContextBase::DrawingBufferSize() const {
if (isContextLost())
return IntSize(0, 0);
return GetDrawingBuffer()->Size();
}
scoped_refptr<Uint8Array>
WebGLRenderingContextBase::PaintRenderingResultsToDataArray(
SourceDrawingBuffer source_buffer) {
if (isContextLost())
return nullptr;
ClearIfComposited();
GetDrawingBuffer()->ResolveAndBindForReadAndDraw();
ScopedFramebufferRestorer restorer(this);
return GetDrawingBuffer()->PaintRenderingResultsToDataArray(source_buffer);
}
void WebGLRenderingContextBase::Reshape(int width, int height) {
if (isContextLost())
return;
GLint buffer = 0;
if (IsWebGL2OrHigher()) {
// This query returns client side cached binding, so it's trivial.
// If it changes in the future, such query is heavy and should be avoided.
ContextGL()->GetIntegerv(GL_PIXEL_UNPACK_BUFFER_BINDING, &buffer);
if (buffer) {
ContextGL()->BindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}
}
// This is an approximation because at WebGLRenderingContextBase level we
// don't know if the underlying FBO uses textures or renderbuffers.
GLint max_size = std::min(max_texture_size_, max_renderbuffer_size_);
GLint max_width = std::min(max_size, max_viewport_dims_[0]);
GLint max_height = std::min(max_size, max_viewport_dims_[1]);
width = Clamp(width, 1, max_width);
height = Clamp(height, 1, max_height);
// Limit drawing buffer area to 4k*4k to avoid memory exhaustion. Width or
// height may be larger than 4k as long as it's within the max viewport
// dimensions and total area remains within the limit.
// For example: 5120x2880 should be fine.
const int kMaxArea = 4096 * 4096;
int current_area = width * height;
if (current_area > kMaxArea) {
// If we've exceeded the area limit scale the buffer down, preserving
// ascpect ratio, until it fits.
float scale_factor =
sqrtf(static_cast<float>(kMaxArea) / static_cast<float>(current_area));
width = std::max(1, static_cast<int>(width * scale_factor));
height = std::max(1, static_cast<int>(height * scale_factor));
}
// We don't have to mark the canvas as dirty, since the newly created image
// buffer will also start off clear (and this matches what reshape will do).
GetDrawingBuffer()->Resize(IntSize(width, height));
if (buffer) {
ContextGL()->BindBuffer(GL_PIXEL_UNPACK_BUFFER,
static_cast<GLuint>(buffer));
}
}
int WebGLRenderingContextBase::drawingBufferWidth() const {
return isContextLost() ? 0 : GetDrawingBuffer()->Size().Width();
}
int WebGLRenderingContextBase::drawingBufferHeight() const {
return isContextLost() ? 0 : GetDrawingBuffer()->Size().Height();
}
void WebGLRenderingContextBase::activeTexture(GLenum texture) {
if (isContextLost())
return;
if (texture - GL_TEXTURE0 >= texture_units_.size()) {
SynthesizeGLError(GL_INVALID_ENUM, "activeTexture",
"texture unit out of range");
return;
}
active_texture_unit_ = texture - GL_TEXTURE0;
ContextGL()->ActiveTexture(texture);
}
void WebGLRenderingContextBase::attachShader(WebGLProgram* program,
WebGLShader* shader) {
if (!ValidateWebGLProgramOrShader("attachShader", program) ||
!ValidateWebGLProgramOrShader("attachShader", shader))
return;
if (!program->AttachShader(shader)) {
SynthesizeGLError(GL_INVALID_OPERATION, "attachShader",
"shader attachment already has shader");
return;
}
ContextGL()->AttachShader(ObjectOrZero(program), ObjectOrZero(shader));
shader->OnAttached();
}
void WebGLRenderingContextBase::bindAttribLocation(WebGLProgram* program,
GLuint index,
const String& name) {
if (!ValidateWebGLObject("bindAttribLocation", program))
return;
if (!ValidateLocationLength("bindAttribLocation", name))
return;
if (IsPrefixReserved(name)) {
SynthesizeGLError(GL_INVALID_OPERATION, "bindAttribLocation",
"reserved prefix");
return;
}
ContextGL()->BindAttribLocation(ObjectOrZero(program), index,
name.Utf8().data());
}
bool WebGLRenderingContextBase::ValidateAndUpdateBufferBindTarget(
const char* function_name,
GLenum target,
WebGLBuffer* buffer) {
if (!ValidateBufferTarget(function_name, target))
return false;
if (buffer && buffer->GetInitialTarget() &&
buffer->GetInitialTarget() != target) {
SynthesizeGLError(GL_INVALID_OPERATION, function_name,
"buffers can not be used with multiple targets");
return false;
}
switch (target) {
case GL_ARRAY_BUFFER:
bound_array_buffer_ = buffer;
break;
case GL_ELEMENT_ARRAY_BUFFER:
bound_vertex_array_object_->SetElementArrayBuffer(buffer);
break;
default:
NOTREACHED();
return false;
}
if (buffer && !buffer->GetInitialTarget())
buffer->SetInitialTarget(target);
return true;
}
void WebGLRenderingContextBase::bindBuffer(GLenum target, WebGLBuffer* buffer) {
if (!ValidateNullableWebGLObject("bindBuffer", buffer))
return;
if (!ValidateAndUpdateBufferBindTarget("bindBuffer", target, buffer))
return;
ContextGL()->BindBuffer(target, ObjectOrZero(buffer));
}
void WebGLRenderingContextBase::bindFramebuffer(GLenum target,
WebGLFramebuffer* buffer) {
if (!ValidateNullableWebGLObject("bindFramebuffer", buffer))
return;
if (target != GL_FRAMEBUFFER) {
SynthesizeGLError(GL_INVALID_ENUM, "bindFramebuffer", "invalid target");
return;
}
SetFramebuffer(target, buffer);
}
void WebGLRenderingContextBase::bindRenderbuffer(
GLenum target,
WebGLRenderbuffer* render_buffer) {
if (!ValidateNullableWebGLObject("bindRenderbuffer", render_buffer))
return;
if (target != GL_RENDERBUFFER) {
SynthesizeGLError(GL_INVALID_ENUM, "bindRenderbuffer", "invalid target");
return;
}
renderbuffer_binding_ = render_buffer;
ContextGL()->BindRenderbuffer(target, ObjectOrZero(render_buffer));
if (render_buffer)
render_buffer->SetHasEverBeenBound();
}
void WebGLRenderingContextBase::bindTexture(GLenum target,
WebGLTexture* texture) {
if (!ValidateNullableWebGLObject("bindTexture", texture))
return;
if (texture && texture->GetTarget() && texture->GetTarget() != target) {
SynthesizeGLError(GL_INVALID_OPERATION, "bindTexture",
"textures can not be used with multiple targets");
return;
}
if (target == GL_TEXTURE_2D) {
texture_units_[active_texture_unit_].texture2d_binding_ = texture;
} else if (target == GL_TEXTURE_CUBE_MAP) {
texture_units_[active_texture_unit_].texture_cube_map_binding_ = texture;
} else if (IsWebGL2OrHigher() && target == GL_TEXTURE_2D_ARRAY) {
texture_units_[active_texture_unit_].texture2d_array_binding_ = texture;
} else if (IsWebGL2OrHigher() && target == GL_TEXTURE_3D) {
texture_units_[active_texture_unit_].texture3d_binding_ = texture;
} else {
SynthesizeGLError(GL_INVALID_ENUM, "bindTexture", "invalid target");
return;
}
ContextGL()->BindTexture(target, ObjectOrZero(texture));
if (texture) {
texture->SetTarget(target);
one_plus_max_non_default_texture_unit_ =
max(active_texture_unit_ + 1, one_plus_max_non_default_texture_unit_);
} else {
// If the disabled index is the current maximum, trace backwards to find the
// new max enabled texture index
if (one_plus_max_non_default_texture_unit_ == active_texture_unit_ + 1) {
FindNewMaxNonDefaultTextureUnit();
}
}
// Note: previously we used to automatically set the TEXTURE_WRAP_R
// repeat mode to CLAMP_TO_EDGE for cube map textures, because OpenGL
// ES 2.0 doesn't expose this flag (a bug in the specification) and
// otherwise the application has no control over the seams in this
// dimension. However, it appears that supporting this properly on all
// platforms is fairly involved (will require a HashMap from texture ID
// in all ports), and we have not had any complaints, so the logic has
// been removed.
}
void WebGLRenderingContextBase::blendColor(GLfloat red,
GLfloat green,
GLfloat blue,
GLfloat alpha) {
if (isContextLost())
return;
ContextGL()->BlendColor(red, green, blue, alpha);
}
void WebGLRenderingContextBase::blendEquation(GLenum mode) {
if (isContextLost() || !ValidateBlendEquation("blendEquation", mode))
return;
ContextGL()->BlendEquation(mode);
}
void WebGLRenderingContextBase::blendEquationSeparate(GLenum mode_rgb,
GLenum mode_alpha) {
if (isContextLost() ||
!ValidateBlendEquation("blendEquationSeparate", mode_rgb) ||
!ValidateBlendEquation("blendEquationSeparate", mode_alpha))
return;
ContextGL()->BlendEquationSeparate(mode_rgb, mode_alpha);
}
void WebGLRenderingContextBase::blendFunc(GLenum sfactor, GLenum dfactor) {
if (isContextLost() ||
!ValidateBlendFuncFactors("blendFunc", sfactor, dfactor))
return;
ContextGL()->BlendFunc(sfactor, dfactor);
}
void WebGLRenderingContextBase::blendFuncSeparate(GLenum src_rgb,
GLenum dst_rgb,
GLenum src_alpha,
GLenum dst_alpha) {
// Note: Alpha does not have the same restrictions as RGB.
if (isContextLost() ||
!ValidateBlendFuncFactors("blendFuncSeparate", src_rgb, dst_rgb))
return;
ContextGL()->BlendFuncSeparate(src_rgb, dst_rgb, src_alpha, dst_alpha);
}
void WebGLRenderingContextBase::BufferDataImpl(GLenum target,
long long size,
const void* data,
GLenum usage) {
WebGLBuffer* buffer = ValidateBufferDataTarget("bufferData", target);
if (!buffer)
return;
if (!ValidateBufferDataUsage("bufferData", usage))
return;
if (!ValidateValueFitNonNegInt32("bufferData", "size", size))
return;
buffer->SetSize(size);
ContextGL()->BufferData(target, static_cast<GLsizeiptr>(size), data, usage);
}
void WebGLRenderingContextBase::bufferData(GLenum target,
long long size,
GLenum usage) {
if (isContextLost())
return;
BufferDataImpl(target, size, nullptr, usage);
}
void WebGLRenderingContextBase::bufferData(GLenum target,
DOMArrayBuffer* data,
GLenum usage) {
if (isContextLost())
return;
if (!data) {
SynthesizeGLError(GL_INVALID_VALUE, "bufferData", "no data");
return;
}
BufferDataImpl(target, data->ByteLength(), data->Data(), usage);
}
void WebGLRenderingContextBase::bufferData(GLenum target,
MaybeShared<DOMArrayBufferView> data,
GLenum usage) {
if (isContextLost())
return;
DCHECK(data);
BufferDataImpl(target, data.View()->byteLength(),
data.View()->BaseAddressMaybeShared(), usage);
}
void WebGLRenderingContextBase::BufferSubDataImpl(GLenum target,
long long offset,
GLsizeiptr size,
const void* data) {
WebGLBuffer* buffer = ValidateBufferDataTarget("bufferSubData", target);
if (!buffer)
return;
if (!ValidateValueFitNonNegInt32("bufferSubData", "offset", offset))
return;
if (!data)
return;
if (offset + static_cast<long long>(size) > buffer->GetSize()) {
SynthesizeGLError(GL_INVALID_VALUE, "bufferSubData", "buffer overflow");
return;
}
ContextGL()->BufferSubData(target, static_cast<GLintptr>(offset), size, data);
}
void WebGLRenderingContextBase::bufferSubData(GLenum target,
long long offset,
DOMArrayBuffer* data) {
if (isContextLost())
return;
DCHECK(data);
BufferSubDataImpl(target, offset, data->ByteLength(), data->Data());
}
void WebGLRenderingContextBase::bufferSubData(
GLenum target,
long long offset,
const FlexibleArrayBufferView& data) {
if (isContextLost())
return;
DCHECK(data);
BufferSubDataImpl(target, offset, data.ByteLength(),
data.BaseAddressMaybeOnStack());
}
bool WebGLRenderingContextBase::ValidateFramebufferTarget(GLenum target) {
if (target == GL_FRAMEBUFFER)
return true;
return false;
}
WebGLFramebuffer* WebGLRenderingContextBase::GetFramebufferBinding(
GLenum target) {
if (target == GL_FRAMEBUFFER)
return framebuffer_binding_.Get();
return nullptr;
}
WebGLFramebuffer* WebGLRenderingContextBase::GetReadFramebufferBinding() {
return framebuffer_binding_.Get();
}
GLenum WebGLRenderingContextBase::checkFramebufferStatus(GLenum target) {
if (isContextLost())
return GL_FRAMEBUFFER_UNSUPPORTED;
if (!ValidateFramebufferTarget(target)) {
SynthesizeGLError(GL_INVALID_ENUM, "checkFramebufferStatus",
"invalid target");
return 0;
}
WebGLFramebuffer* framebuffer_binding = GetFramebufferBinding(target);
if (framebuffer_binding) {
const char* reason = "framebuffer incomplete";
GLenum status = framebuffer_binding->CheckDepthStencilStatus(&reason);
if (status != GL_FRAMEBUFFER_COMPLETE) {
EmitGLWarning("checkFramebufferStatus", reason);
return status;
}
}
return ContextGL()->CheckFramebufferStatus(target);
}
void WebGLRenderingContextBase::clear(GLbitfield mask) {
if (isContextLost())
return;
if (mask &
~(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) {
SynthesizeGLError(GL_INVALID_VALUE, "clear", "invalid mask");
return;
}
const char* reason = "framebuffer incomplete";
if (framebuffer_binding_ && framebuffer_binding_->CheckDepthStencilStatus(
&reason) != GL_FRAMEBUFFER_COMPLETE) {
SynthesizeGLError(GL_INVALID_FRAMEBUFFER_OPERATION, "clear", reason);
return;
}
if (!mask) {
// Use OnErrorMessage because it's both rate-limited and obeys the
// webGLErrorsToConsole setting.
OnErrorMessage(
"Performance warning: clear() called with no buffers in bitmask", 0);
// Don't skip the call to ClearIfComposited below; it has side
// effects even without the user requesting to clear any buffers.
}
ScopedRGBEmulationColorMask emulation_color_mask(this, color_mask_,
drawing_buffer_.get());
if (ClearIfComposited(mask) != kCombinedClear) {
// If clearing the default back buffer's depth buffer, also clear the
// stencil buffer, if one was allocated implicitly. This avoids performance
// problems on some GPUs.
if (!framebuffer_binding_ &&
GetDrawingBuffer()->HasImplicitStencilBuffer() &&
(mask & GL_DEPTH_BUFFER_BIT)) {
// It shouldn't matter what value it's cleared to, since in other queries
// in the API, we claim that the stencil buffer doesn't exist.
mask |= GL_STENCIL_BUFFER_BIT;
}
ContextGL()->Clear(mask);
}
MarkContextChanged(kCanvasChanged);
}
void WebGLRenderingContextBase::clearColor(GLfloat r,
GLfloat g,
GLfloat b,
GLfloat a) {
if (isContextLost())
return;
if (std::isnan(r))
r = 0;
if (std::isnan(g))
g = 0;
if (std::isnan(b))
b = 0;
if (std::isnan(a))
a = 1;
clear_color_[0] = r;
clear_color_[1] = g;
clear_color_[2] = b;
clear_color_[3] = a;
ContextGL()->ClearColor(r, g, b, a);
}
void WebGLRenderingContextBase::clearDepth(GLfloat depth) {
if (isContextLost())
return;
clear_depth_ = depth;
ContextGL()->ClearDepthf(depth);
}
void WebGLRenderingContextBase::clearStencil(GLint s) {
if (isContextLost())
return;
clear_stencil_ = s;
ContextGL()->ClearStencil(s);
}
void WebGLRenderingContextBase::colorMask(GLboolean red,
GLboolean green,
GLboolean blue,
GLboolean alpha) {
if (isContextLost())
return;
color_mask_[0] = red;
color_mask_[1] = green;
color_mask_[2] = blue;
color_mask_[3] = alpha;
ContextGL()->ColorMask(red, green, blue, alpha);
}
void WebGLRenderingContextBase::compileShader(WebGLShader* shader) {
if (!ValidateWebGLProgramOrShader("compileShader", shader))
return;
ContextGL()->CompileShader(ObjectOrZero(shader));
}
void WebGLRenderingContextBase::compressedTexImage2D(
GLenum target,
GLint level,
GLenum internalformat,
GLsizei width,
GLsizei height,
GLint border,
MaybeShared<DOMArrayBufferView> data) {
if (isContextLost())
return;
if (!ValidateTexture2DBinding("compressedTexImage2D", target))
return;
if (!ValidateCompressedTexFormat("compressedTexImage2D", internalformat))
return;
ContextGL()->CompressedTexImage2D(target, level, internalformat, width,
height, border, data.View()->byteLength(),
data.View()->BaseAddressMaybeShared());
}
void WebGLRenderingContextBase::compressedTexSubImage2D(
GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLsizei width,
GLsizei height,
GLenum format,
MaybeShared<DOMArrayBufferView> data) {
if (isContextLost())
return;
if (!ValidateTexture2DBinding("compressedTexSubImage2D", target))
return;
if (!ValidateCompressedTexFormat("compressedTexSubImage2D", format))
return;
ContextGL()->CompressedTexSubImage2D(
target, level, xoffset, yoffset, width, height, format,
data.View()->byteLength(), data.View()->BaseAddressMaybeShared());
}
bool WebGLRenderingContextBase::ValidateSettableTexFormat(
const char* function_name,
GLenum format) {
if (IsWebGL2OrHigher())
return true;
if (WebGLImageConversion::GetChannelBitsByFormat(format) &
WebGLImageConversion::kChannelDepthStencil) {
SynthesizeGLError(GL_INVALID_OPERATION, function_name,
"format can not be set, only rendered to");
return false;
}
return true;
}
bool WebGLRenderingContextBase::ValidateCopyTexFormat(const char* function_name,
GLenum internalformat) {
if (!is_web_gl2_internal_formats_copy_tex_image_added_ &&
IsWebGL2OrHigher()) {
ADD_VALUES_TO_SET(supported_internal_formats_copy_tex_image_,
kSupportedInternalFormatsES3);
is_web_gl2_internal_formats_copy_tex_image_added_ = true;
}
if (!is_ext_color_buffer_float_formats_added_ &&
ExtensionEnabled(kEXTColorBufferFloatName)) {
ADD_VALUES_TO_SET(supported_internal_formats_copy_tex_image_,
kSupportedInternalFormatsCopyTexImageFloatES3);
is_ext_color_buffer_float_formats_added_ = true;
}
if (supported_internal_formats_copy_tex_image_.find(internalformat) ==
supported_internal_formats_copy_tex_image_.end()) {
SynthesizeGLError(GL_INVALID_ENUM, function_name, "invalid internalformat");
return false;
}
return true;
}
void WebGLRenderingContextBase::copyTexImage2D(GLenum target,
GLint level,
GLenum internalformat,
GLint x,
GLint y,
GLsizei width,
GLsizei height,
GLint border) {
if (isContextLost())
return;
if (!ValidateTexture2DBinding("copyTexImage2D", target))
return;
if (!ValidateCopyTexFormat("copyTexImage2D", internalformat))
return;
if (!ValidateSettableTexFormat("copyTexImage2D", internalformat))
return;
WebGLFramebuffer* read_framebuffer_binding = nullptr;
if (!ValidateReadBufferAndGetInfo("copyTexImage2D", read_framebuffer_binding))
return;
ClearIfComposited();
ScopedDrawingBufferBinder binder(GetDrawingBuffer(),
read_framebuffer_binding);
ContextGL()->CopyTexImage2D(target, level, internalformat, x, y, width,
height, border);
}
void WebGLRenderingContextBase::copyTexSubImage2D(GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLint x,
GLint y,
GLsizei width,
GLsizei height) {
if (isContextLost())
return;
if (!ValidateTexture2DBinding("copyTexSubImage2D", target))
return;
WebGLFramebuffer* read_framebuffer_binding = nullptr;
if (!ValidateReadBufferAndGetInfo("copyTexSubImage2D",
read_framebuffer_binding))
return;
ClearIfComposited();
ScopedDrawingBufferBinder binder(GetDrawingBuffer(),
read_framebuffer_binding);
ContextGL()->CopyTexSubImage2D(target, level, xoffset, yoffset, x, y, width,
height);
}
WebGLBuffer* WebGLRenderingContextBase::createBuffer() {
if (isContextLost())
return nullptr;
return WebGLBuffer::Create(this);
}
WebGLFramebuffer* WebGLRenderingContextBase::createFramebuffer() {
if (isContextLost())
return nullptr;
return WebGLFramebuffer::Create(this);
}
WebGLTexture* WebGLRenderingContextBase::createTexture() {
if (isContextLost())
return nullptr;
return WebGLTexture::Create(this);
}
WebGLProgram* WebGLRenderingContextBase::createProgram() {
if (isContextLost())
return nullptr;
return WebGLProgram::Create(this);
}
WebGLRenderbuffer* WebGLRenderingContextBase::createRenderbuffer() {
if (isContextLost())
return nullptr;
return WebGLRenderbuffer::Create(this);
}
void WebGLRenderingContextBase::SetBoundVertexArrayObject(
WebGLVertexArrayObjectBase* array_object) {
if (array_object)
bound_vertex_array_object_ = array_object;
else
bound_vertex_array_object_ = default_vertex_array_object_;
}
bool WebGLRenderingContextBase::ValidateShaderType(const char* function_name,
GLenum shader_type) {
switch (shader_type) {
case GL_VERTEX_SHADER:
case GL_FRAGMENT_SHADER:
return true;
case GL_COMPUTE_SHADER:
if (context_type_ != Platform::kWebGL2ComputeContextType) {
SynthesizeGLError(GL_INVALID_ENUM, function_name,
"invalid shader type");
return false;
}
return true;
default:
SynthesizeGLError(GL_INVALID_ENUM, function_name, "invalid shader type");
return false;
}
}
WebGLShader* WebGLRenderingContextBase::createShader(GLenum type) {
if (isContextLost())
return nullptr;
if (!ValidateShaderType("createShader", type)) {
return nullptr;
}
return WebGLShader::Create(this, type);
}
void WebGLRenderingContextBase::cullFace(GLenum mode) {
if (isContextLost())
return;
ContextGL()->CullFace(mode);
}
bool WebGLRenderingContextBase::DeleteObject(WebGLObject* object) {
if (isContextLost() || !object)
return false;
if (!object->Validate(ContextGroup(), this)) {
SynthesizeGLError(GL_INVALID_OPERATION, "delete",
"object does not belong to this context");
return false;
}
if (object->MarkedForDeletion()) {
// This is specified to be a no-op, including skipping all unbinding from
// the context's attachment points that would otherwise happen.
return false;
}
if (object->HasObject()) {
// We need to pass in context here because we want
// things in this context unbound.
object->DeleteObject(ContextGL());
}
return true;
}
void WebGLRenderingContextBase::deleteBuffer(WebGLBuffer* buffer) {
if (!DeleteObject(buffer))
return;
RemoveBoundBuffer(buffer);
}
void WebGLRenderingContextBase::deleteFramebuffer(
WebGLFramebuffer* framebuffer) {
// Don't allow the application to delete an opaque framebuffer.
if (framebuffer && framebuffer->Opaque()) {
SynthesizeGLError(GL_INVALID_OPERATION, "deleteFramebuffer",
"cannot delete an opaque framebuffer");
return;
}
if (!DeleteObject(framebuffer))
return;
if (framebuffer == framebuffer_binding_) {
framebuffer_binding_ = nullptr;
// Have to call drawingBuffer()->bind() here to bind back to internal fbo.
GetDrawingBuffer()->Bind(GL_FRAMEBUFFER);
}
}
void WebGLRenderingContextBase::deleteProgram(WebGLProgram* program) {
DeleteObject(program);
// We don't reset m_currentProgram to 0 here because the deletion of the
// current program is delayed.
}
void WebGLRenderingContextBase::deleteRenderbuffer(
WebGLRenderbuffer* renderbuffer) {
if (!DeleteObject(renderbuffer))
return;
if (renderbuffer == renderbuffer_binding_) {
renderbuffer_binding_ = nullptr;
}
if (framebuffer_binding_)
framebuffer_binding_->RemoveAttachmentFromBoundFramebuffer(GL_FRAMEBUFFER,
renderbuffer);
if (GetFramebufferBinding(GL_READ_FRAMEBUFFER))
GetFramebufferBinding(GL_READ_FRAMEBUFFER)
->RemoveAttachmentFromBoundFramebuffer(GL_READ_FRAMEBUFFER,
renderbuffer);
}
void WebGLRenderingContextBase::deleteShader(WebGLShader* shader) {
DeleteObject(shader);
}
void WebGLRenderingContextBase::deleteTexture(WebGLTexture* texture) {
if (!DeleteObject(texture))
return;
int max_bound_texture_index = -1;
for (wtf_size_t i = 0; i < one_plus_max_non_default_texture_unit_; ++i) {
if (texture == texture_units_[i].texture2d_binding_) {
texture_units_[i].texture2d_binding_ = nullptr;
max_bound_texture_index = i;
}
if (texture == texture_units_[i].texture_cube_map_binding_) {
texture_units_[i].texture_cube_map_binding_ = nullptr;
max_bound_texture_index = i;
}
if (IsWebGL2OrHigher()) {
if (texture == texture_units_[i].texture3d_binding_) {
texture_units_[i].texture3d_binding_ = nullptr;
max_bound_texture_index = i;
}
if (texture == texture_units_[i].texture2d_array_binding_) {
texture_units_[i].texture2d_array_binding_ = nullptr;
max_bound_texture_index = i;
}
}
}
if (framebuffer_binding_)
framebuffer_binding_->RemoveAttachmentFromBoundFramebuffer(GL_FRAMEBUFFER,
texture);
if (GetFramebufferBinding(GL_READ_FRAMEBUFFER))
GetFramebufferBinding(GL_READ_FRAMEBUFFER)
->RemoveAttachmentFromBoundFramebuffer(GL_READ_FRAMEBUFFER, texture);
// If the deleted was bound to the the current maximum index, trace backwards
// to find the new max texture index.
if (one_plus_max_non_default_texture_unit_ ==
static_cast<unsigned long>(max_bound_texture_index + 1)) {
FindNewMaxNonDefaultTextureUnit();
}
}
void WebGLRenderingContextBase::depthFunc(GLenum func) {
if (isContextLost())
return;
ContextGL()->DepthFunc(func);
}
void WebGLRenderingContextBase::depthMask(GLboolean flag) {
if (isContextLost())
return;
depth_mask_ = flag;
ContextGL()->DepthMask(flag);
}
void WebGLRenderingContextBase::depthRange(GLfloat z_near, GLfloat z_far) {
if (isContextLost())
return;
// Check required by WebGL spec section 6.12
if (z_near > z_far) {
SynthesizeGLError(GL_INVALID_OPERATION, "depthRange", "zNear > zFar");
return;
}
ContextGL()->DepthRangef(z_near, z_far);
}
void WebGLRenderingContextBase::detachShader(WebGLProgram* program,
WebGLShader* shader) {
if (!ValidateWebGLProgramOrShader("detachShader", program) ||
!ValidateWebGLProgramOrShader("detachShader", shader))
return;
if (!program->DetachShader(shader)) {
SynthesizeGLError(GL_INVALID_OPERATION, "detachShader",
"shader not attached");
return;
}
ContextGL()->DetachShader(ObjectOrZero(program), ObjectOrZero(shader));
shader->OnDetached(ContextGL());
}
void WebGLRenderingContextBase::disable(GLenum cap) {
if (isContextLost() || !ValidateCapability("disable", cap))
return;
if (cap == GL_STENCIL_TEST) {
stencil_enabled_ = false;
ApplyStencilTest();
return;
}
if (cap == GL_SCISSOR_TEST)
scissor_enabled_ = false;
ContextGL()->Disable(cap);
}
void WebGLRenderingContextBase::disableVertexAttribArray(GLuint index) {
if (isContextLost())
return;
if (index >= max_vertex_attribs_) {
SynthesizeGLError(GL_INVALID_VALUE, "disableVertexAttribArray",
"index out of range");
return;
}
bound_vertex_array_object_->SetAttribEnabled(index, false);
ContextGL()->DisableVertexAttribArray(index);
}
bool WebGLRenderingContextBase::ValidateRenderingState(
const char* function_name) {
// Command buffer will not error if no program is bound.
if (!current_program_) {
SynthesizeGLError(GL_INVALID_OPERATION, function_name,
"no valid shader program in use");
return false;
}
return true;
}
bool WebGLRenderingContextBase::ValidateNullableWebGLObject(
const char* function_name,
WebGLObject* object) {
if (isContextLost())
return false;
if (!object) {
// This differs in behavior to ValidateWebGLObject; null objects are allowed
// in these entry points.
return true;
}
return ValidateWebGLObject(function_name, object);
}
bool WebGLRenderingContextBase::ValidateWebGLObject(const char* function_name,
WebGLObject* object) {
if (isContextLost())
return false;
DCHECK(object);
if (object->MarkedForDeletion()) {
SynthesizeGLError(GL_INVALID_OPERATION, function_name,
"attempt to use a deleted object");
return false;
}
if (!object->Validate(ContextGroup(), this)) {
SynthesizeGLError(GL_INVALID_OPERATION, function_name,
"object does not belong to this context");
return false;
}
return true;
}
bool WebGLRenderingContextBase::ValidateWebGLProgramOrShader(
const char* function_name,
WebGLObject* object) {
if (isContextLost())
return false;
DCHECK(object);
// OpenGL ES 3.0.5 p. 45:
// "Commands that accept shader or program object names will generate the
// error INVALID_VALUE if the provided name is not the name of either a shader
// or program object and INVALID_OPERATION if the provided name identifies an
// object that is not the expected type."
//
// Programs and shaders also have slightly different lifetime rules than other
// objects in the API; they continue to be usable after being marked for
// deletion.
if (!object->HasObject()) {
SynthesizeGLError(GL_INVALID_VALUE, function_name,
"attempt to use a deleted object");
return false;
}
if (!object->Validate(ContextGroup(), this)) {
SynthesizeGLError(GL_INVALID_OPERATION, function_name,
"object does not belong to this context");
return false;
}
return true;
}
void WebGLRenderingContextBase::drawArrays(GLenum mode,
GLint first,
GLsizei count) {
if (!ValidateDrawArrays("drawArrays"))
return;
if (!bound_vertex_array_object_->IsAllEnabledAttribBufferBound()) {
SynthesizeGLError(GL_INVALID_OPERATION, "drawArrays",
"no buffer is bound to enabled attribute");
return;
}
ScopedRGBEmulationColorMask emulation_color_mask(this, color_mask_,
drawing_buffer_.get());
OnBeforeDrawCall();
ContextGL()->DrawArrays(mode, first, count);
}
void WebGLRenderingContextBase::drawElements(GLenum mode,
GLsizei count,
GLenum type,
long long offset) {
if (!ValidateDrawElements("drawElements", type, offset))
return;
if (!bound_vertex_array_object_->IsAllEnabledAttribBufferBound()) {
SynthesizeGLError(GL_INVALID_OPERATION, "drawElements",
"no buffer is bound to enabled attribute");
return;
}
ScopedRGBEmulationColorMask emulation_color_mask(this, color_mask_,
drawing_buffer_.get());
OnBeforeDrawCall();
ContextGL()->DrawElements(
mode, count, type,
reinterpret_cast<void*>(static_cast<intptr_t>(offset)));
}
void WebGLRenderingContextBase::DrawArraysInstancedANGLE(GLenum mode,
GLint first,
GLsizei count,
GLsizei primcount) {
if (!ValidateDrawArrays("drawArraysInstancedANGLE"))
return;
if (!bound_vertex_array_object_->IsAllEnabledAttribBufferBound()) {
SynthesizeGLError(GL_INVALID_OPERATION, "drawArraysInstancedANGLE",
"no buffer is bound to enabled attribute");
return;
}
ScopedRGBEmulationColorMask emulation_color_mask(this, color_mask_,
drawing_buffer_.get());
OnBeforeDrawCall();
ContextGL()->DrawArraysInstancedANGLE(mode, first, count, primcount);
}
void WebGLRenderingContextBase::DrawElementsInstancedANGLE(GLenum mode,
GLsizei count,
GLenum type,
long long offset,
GLsizei primcount) {
if (!ValidateDrawElements("drawElementsInstancedANGLE", type, offset))
return;
if (!bound_vertex_array_object_->IsAllEnabledAttribBufferBound()) {
SynthesizeGLError(GL_INVALID_OPERATION, "drawElementsInstancedANGLE",
"no buffer is bound to enabled attribute");
return;
}
ScopedRGBEmulationColorMask emulation_color_mask(this, color_mask_,
drawing_buffer_.get());
OnBeforeDrawCall();
ContextGL()->DrawElementsInstancedANGLE(
mode, count, type, reinterpret_cast<void*>(static_cast<intptr_t>(offset)),
primcount);
}
void WebGLRenderingContextBase::enable(GLenum cap) {
if (isContextLost() || !ValidateCapability("enable", cap))
return;
if (cap == GL_STENCIL_TEST) {
stencil_enabled_ = true;
ApplyStencilTest();
return;
}
if (cap == GL_SCISSOR_TEST)
scissor_enabled_ = true;
ContextGL()->Enable(cap);
}
void WebGLRenderingContextBase::enableVertexAttribArray(GLuint index) {
if (isContextLost())
return;
if (index >= max_vertex_attribs_) {
SynthesizeGLError(GL_INVALID_VALUE, "enableVertexAttribArray",
"index out of range");
return;
}
bound_vertex_array_object_->SetAttribEnabled(index, true);
ContextGL()->EnableVertexAttribArray(index);
}
void WebGLRenderingContextBase::finish() {
if (isContextLost())
return;
ContextGL()->Flush(); // Intentionally a flush, not a finish.
}
void WebGLRenderingContextBase::flush() {
if (isContextLost())
return;
ContextGL()->Flush();
}
void WebGLRenderingContextBase::framebufferRenderbuffer(
GLenum target,
GLenum attachment,
GLenum renderbuffertarget,
WebGLRenderbuffer* buffer) {
if (isContextLost() || !ValidateFramebufferFuncParameters(
"framebufferRenderbuffer", target, attachment))
return;
if (renderbuffertarget != GL_RENDERBUFFER) {
SynthesizeGLError(GL_INVALID_ENUM, "framebufferRenderbuffer",
"invalid target");
return;
}
if (!ValidateNullableWebGLObject("framebufferRenderbuffer", buffer))
return;
if (buffer && (!buffer->HasEverBeenBound())) {
SynthesizeGLError(GL_INVALID_OPERATION, "framebufferRenderbuffer",
"renderbuffer has never been bound");
return;
}
// Don't allow the default framebuffer to be mutated; all current
// implementations use an FBO internally in place of the default