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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include <string>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "gpu/command_buffer/common/context_creation_attribs.h"
#include "gpu/command_buffer/common/gpu_memory_buffer_support.h"
#include "gpu/command_buffer/service/gles2_cmd_decoder.h"
#include "gpu/command_buffer/service/gles2_cmd_validation.h"
#include "gpu/config/gpu_driver_bug_workarounds.h"
#include "gpu/config/gpu_feature_info.h"
#include "gpu/gpu_gles2_export.h"
#include "ui/gfx/extension_set.h"
namespace base {
class CommandLine;
namespace gl {
struct GLVersionInfo;
namespace gpu {
namespace gles2 {
// FeatureInfo records the features that are available for a ContextGroup.
class GPU_GLES2_EXPORT FeatureInfo : public base::RefCounted<FeatureInfo> {
struct FeatureFlags {
GpuMemoryBufferFormatSet gpu_memory_buffer_formats = {
gfx::BufferFormat::BGR_565, gfx::BufferFormat::RGBA_4444,
gfx::BufferFormat::RGBA_8888, gfx::BufferFormat::RGBX_8888,
// Use glBlitFramebuffer() and glRenderbufferStorageMultisample() with
// GL_EXT_framebuffer_multisample-style semantics (as opposed to
// GL_EXT_multisampled_render_to_texture semantics).
bool chromium_framebuffer_multisample = false;
bool chromium_sync_query = false;
bool multisampled_render_to_texture = false;
// Use the IMG GLenum values rather than EXT.
bool use_img_for_multisampled_render_to_texture = false;
bool chromium_screen_space_antialiasing = false;
bool use_chromium_screen_space_antialiasing_via_shaders = false;
bool oes_standard_derivatives = false;
bool oes_egl_image_external = false;
bool nv_egl_stream_consumer_external = false;
bool oes_depth24 = false;
bool oes_compressed_etc1_rgb8_texture = false;
bool packed_depth24_stencil8 = false;
bool npot_ok = false;
bool enable_texture_float_linear = false;
bool enable_texture_half_float_linear = false;
bool enable_color_buffer_float = false;
bool enable_color_buffer_half_float = false;
bool angle_translated_shader_source = false;
bool angle_pack_reverse_row_order = false;
bool arb_texture_rectangle = false;
bool angle_instanced_arrays = false;
bool occlusion_query = false;
bool occlusion_query_boolean = false;
bool use_arb_occlusion_query2_for_occlusion_query_boolean = false;
bool use_arb_occlusion_query_for_occlusion_query_boolean = false;
bool native_vertex_array_object = false;
bool ext_texture_format_astc = false;
bool ext_texture_format_atc = false;
bool ext_texture_format_bgra8888 = false;
bool ext_texture_format_dxt1 = false;
bool ext_texture_format_dxt5 = false;
bool enable_shader_name_hashing = false;
bool enable_samplers = false;
bool ext_draw_buffers = false;
bool nv_draw_buffers = false;
bool ext_frag_depth = false;
bool ext_shader_texture_lod = false;
bool use_async_readpixels = false;
bool map_buffer_range = false;
bool ext_discard_framebuffer = false;
bool angle_depth_texture = false;
bool is_swiftshader_for_webgl = false;
bool is_swiftshader = false;
bool chromium_texture_filtering_hint = false;
bool angle_texture_usage = false;
bool ext_texture_storage = false;
bool chromium_path_rendering = false;
bool chromium_raster_transport = false;
bool chromium_framebuffer_mixed_samples = false;
bool blend_equation_advanced = false;
bool blend_equation_advanced_coherent = false;
bool ext_texture_rg = false;
bool ext_texture_norm16 = false;
bool chromium_image_ycbcr_420v = false;
bool chromium_image_ycbcr_422 = false;
bool chromium_image_xr30 = false;
bool chromium_image_xb30 = false;
bool emulate_primitive_restart_fixed_index = false;
bool ext_render_buffer_format_bgra8888 = false;
bool ext_multisample_compatibility = false;
bool ext_blend_func_extended = false;
bool ext_read_format_bgra = false;
bool desktop_srgb_support = false;
bool arb_es3_compatibility = false;
bool chromium_color_buffer_float_rgb = false;
bool chromium_color_buffer_float_rgba = false;
bool angle_robust_client_memory = false;
bool khr_debug = false;
bool chromium_bind_generates_resource = false;
bool angle_webgl_compatibility = false;
bool ext_srgb_write_control = false;
bool ext_srgb = false;
bool chromium_copy_texture = false;
bool chromium_copy_compressed_texture = false;
bool ext_disjoint_timer_query = false;
bool angle_client_arrays = false;
bool angle_request_extension = false;
bool ext_debug_marker = false;
bool arb_robustness = false;
bool khr_robustness = false;
bool ext_robustness = false;
bool ext_pixel_buffer_object = false;
bool ext_unpack_subimage = false;
bool oes_rgb8_rgba8 = false;
bool angle_robust_resource_initialization = false;
bool nv_fence = false;
bool chromium_texture_storage_image = false;
bool ext_window_rectangles = false;
bool chromium_gpu_fence = false;
bool unpremultiply_and_dither_copy = false;
bool separate_stencil_ref_mask_writemask = false;
bool mesa_framebuffer_flip_y = false;
bool angle_multiview = false;
bool khr_parallel_shader_compile = false;
bool android_surface_control = false;
bool khr_robust_buffer_access_behavior = false;
// Constructor with workarounds taken from the current process's CommandLine
FeatureInfo(const GpuDriverBugWorkarounds& gpu_driver_bug_workarounds,
const GpuFeatureInfo& gpu_feature_info);
// Initializes the feature information. Needs a current GL context.
void Initialize(ContextType context_type,
bool is_passthrough_cmd_decoder,
const DisallowedFeatures& disallowed_features);
// Helper that defaults to no disallowed features and a GLES2 context.
void InitializeForTesting();
// Helper that defaults to no disallowed Features.
void InitializeForTesting(ContextType context_type);
// Helper that defaults to a GLES2 context.
void InitializeForTesting(const DisallowedFeatures& disallowed_features);
const Validators* validators() const {
return &validators_;
ContextType context_type() const { return context_type_; }
const gfx::ExtensionSet& extensions() const { return extensions_; }
const FeatureFlags& feature_flags() const {
return feature_flags_;
const GpuDriverBugWorkarounds& workarounds() const { return workarounds_; }
const DisallowedFeatures& disallowed_features() const {
return disallowed_features_;
const gl::GLVersionInfo& gl_version_info() const {
return *(gl_version_info_.get());
bool IsES3Capable() const;
void EnableES3Validators();
bool disable_shader_translator() const { return disable_shader_translator_; }
bool IsWebGLContext() const;
bool IsWebGL1OrES2Context() const;
bool IsWebGL2OrES3Context() const;
bool IsWebGL2OrES3OrHigherContext() const;
bool IsWebGL2ComputeContext() const;
void EnableCHROMIUMTextureStorageImage();
void EnableCHROMIUMColorBufferFloatRGBA();
void EnableCHROMIUMColorBufferFloatRGB();
void EnableEXTColorBufferFloat();
void EnableEXTColorBufferHalfFloat();
void EnableOESTextureFloatLinear();
void EnableOESTextureHalfFloatLinear();
bool ext_color_buffer_float_available() const {
return ext_color_buffer_float_available_;
bool ext_color_buffer_half_float_available() const {
return ext_color_buffer_half_float_available_;
bool oes_texture_float_linear_available() const {
return oes_texture_float_linear_available_;
bool oes_texture_half_float_linear_available() const {
return oes_texture_half_float_linear_available_;
friend class base::RefCounted<FeatureInfo>;
friend class BufferManagerClientSideArraysTest;
void AddExtensionString(const base::StringPiece& s);
void InitializeBasicState(const base::CommandLine* command_line);
void InitializeFeatures();
void InitializeFloatAndHalfFloatFeatures(const gfx::ExtensionSet& extensions);
Validators validators_;
DisallowedFeatures disallowed_features_;
ContextType context_type_ = CONTEXT_TYPE_OPENGLES2;
bool is_passthrough_cmd_decoder_ = false;
// The set of extensions returned by glGetString(GL_EXTENSIONS);
gfx::ExtensionSet extensions_;
// Flags for some features
FeatureFlags feature_flags_;
// Flags for Workarounds.
GpuDriverBugWorkarounds workarounds_;
bool ext_color_buffer_float_available_ = false;
bool ext_color_buffer_half_float_available_ = false;
bool oes_texture_float_linear_available_ = false;
bool oes_texture_half_float_linear_available_ = false;
bool disable_shader_translator_;
std::unique_ptr<gl::GLVersionInfo> gl_version_info_;
} // namespace gles2
} // namespace gpu