| /* |
| * Copyright (C) 2013 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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 "modules/webgl/WebGLDrawBuffers.h" |
| |
| #include "gpu/command_buffer/client/gles2_interface.h" |
| #include "modules/webgl/WebGLFramebuffer.h" |
| |
| namespace blink { |
| |
| WebGLDrawBuffers::WebGLDrawBuffers(WebGLRenderingContextBase* context) |
| : WebGLExtension(context) |
| { |
| context->extensionsUtil()->ensureExtensionEnabled("GL_EXT_draw_buffers"); |
| } |
| |
| WebGLDrawBuffers::~WebGLDrawBuffers() |
| { |
| } |
| |
| WebGLExtensionName WebGLDrawBuffers::name() const |
| { |
| return WebGLDrawBuffersName; |
| } |
| |
| WebGLDrawBuffers* WebGLDrawBuffers::create(WebGLRenderingContextBase* context) |
| { |
| return new WebGLDrawBuffers(context); |
| } |
| |
| // static |
| bool WebGLDrawBuffers::supported(WebGLRenderingContextBase* context) |
| { |
| return (context->extensionsUtil()->supportsExtension("GL_EXT_draw_buffers") |
| && satisfiesWebGLRequirements(context)); |
| } |
| |
| // static |
| const char* WebGLDrawBuffers::extensionName() |
| { |
| return "WEBGL_draw_buffers"; |
| } |
| |
| void WebGLDrawBuffers::drawBuffersWEBGL(const Vector<GLenum>& buffers) |
| { |
| WebGLExtensionScopedContext scoped(this); |
| if (scoped.isLost()) |
| return; |
| GLsizei n = buffers.size(); |
| const GLenum* bufs = buffers.data(); |
| if (!scoped.context()->m_framebufferBinding) { |
| if (n != 1) { |
| scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "must provide exactly one buffer"); |
| return; |
| } |
| if (bufs[0] != GL_BACK && bufs[0] != GL_NONE) { |
| scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "BACK or NONE"); |
| return; |
| } |
| // Because the backbuffer is simulated on all current WebKit ports, we need to change BACK to COLOR_ATTACHMENT0. |
| GLenum value = (bufs[0] == GL_BACK) ? GL_COLOR_ATTACHMENT0 : GL_NONE; |
| scoped.context()->contextGL()->DrawBuffersEXT(1, &value); |
| scoped.context()->setBackDrawBuffer(bufs[0]); |
| } else { |
| if (n > scoped.context()->maxDrawBuffers()) { |
| scoped.context()->synthesizeGLError(GL_INVALID_VALUE, "drawBuffersWEBGL", "more than max draw buffers"); |
| return; |
| } |
| for (GLsizei i = 0; i < n; ++i) { |
| if (bufs[i] != GL_NONE && bufs[i] != static_cast<GLenum>(GL_COLOR_ATTACHMENT0_EXT + i)) { |
| scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "COLOR_ATTACHMENTi_EXT or NONE"); |
| return; |
| } |
| } |
| scoped.context()->m_framebufferBinding->drawBuffers(buffers); |
| } |
| } |
| |
| // static |
| bool WebGLDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContextBase* webglContext) |
| { |
| gpu::gles2::GLES2Interface* gl = webglContext->contextGL(); |
| Extensions3DUtil* extensionsUtil = webglContext->extensionsUtil(); |
| |
| // This is called after we make sure GL_EXT_draw_buffers is supported. |
| GLint maxDrawBuffers = 0; |
| GLint maxColorAttachments = 0; |
| gl->GetIntegerv(GL_MAX_DRAW_BUFFERS_EXT, &maxDrawBuffers); |
| gl->GetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &maxColorAttachments); |
| if (maxDrawBuffers < 4 || maxColorAttachments < 4) |
| return false; |
| |
| GLuint fbo; |
| gl->GenFramebuffers(1, &fbo); |
| gl->BindFramebuffer(GL_FRAMEBUFFER, fbo); |
| |
| const unsigned char* buffer = 0; // Chromium doesn't allow init data for depth/stencil tetxures. |
| bool supportsDepth = (extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture") |
| || extensionsUtil->supportsExtension("GL_OES_depth_texture") |
| || extensionsUtil->supportsExtension("GL_ARB_depth_texture")); |
| bool supportsDepthStencil = (extensionsUtil->supportsExtension("GL_EXT_packed_depth_stencil") |
| || extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil")); |
| GLuint depthStencil = 0; |
| if (supportsDepthStencil) { |
| gl->GenTextures(1, &depthStencil); |
| gl->BindTexture(GL_TEXTURE_2D, depthStencil); |
| gl->TexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_OES, 1, 1, 0, GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, buffer); |
| } |
| GLuint depth = 0; |
| if (supportsDepth) { |
| gl->GenTextures(1, &depth); |
| gl->BindTexture(GL_TEXTURE_2D, depth); |
| gl->TexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 1, 1, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buffer); |
| } |
| |
| Vector<GLuint> colors; |
| bool ok = true; |
| GLint maxAllowedBuffers = std::min(maxDrawBuffers, maxColorAttachments); |
| for (GLint i = 0; i < maxAllowedBuffers; ++i) { |
| GLuint color; |
| |
| gl->GenTextures(1, &color); |
| colors.append(color); |
| gl->BindTexture(GL_TEXTURE_2D, color); |
| gl->TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer); |
| gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, color, 0); |
| if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { |
| ok = false; |
| break; |
| } |
| if (supportsDepth) { |
| gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth, 0); |
| if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { |
| ok = false; |
| break; |
| } |
| gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0); |
| } |
| if (supportsDepthStencil) { |
| // For ES 2.0 contexts DEPTH_STENCIL is not available natively, so we emulate it |
| // at the command buffer level for WebGL contexts. |
| gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0); |
| if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { |
| ok = false; |
| break; |
| } |
| gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_TEXTURE_2D, 0, 0); |
| } |
| } |
| |
| webglContext->restoreCurrentFramebuffer(); |
| gl->DeleteFramebuffers(1, &fbo); |
| webglContext->restoreCurrentTexture2D(); |
| if (supportsDepth) |
| gl->DeleteTextures(1, &depth); |
| if (supportsDepthStencil) |
| gl->DeleteTextures(1, &depthStencil); |
| gl->DeleteTextures(colors.size(), colors.data()); |
| |
| return ok; |
| } |
| |
| } // namespace blink |
