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// Copyright 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 "cc/output/texture_copier.h"
#include "base/debug/trace_event.h"
#include "build/build_config.h"
#include "cc/output/gl_renderer.h" // For the GLC() macro.
#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
#include "third_party/khronos/GLES2/gl2.h"
namespace cc {
AcceleratedTextureCopier::AcceleratedTextureCopier(
WebKit::WebGraphicsContext3D* context,
bool using_bind_uniforms)
: context_(context), using_bind_uniforms_(using_bind_uniforms) {
DCHECK(context_);
GLC(context_, fbo_ = context_->createFramebuffer());
GLC(context_, position_buffer_ = context_->createBuffer());
static const float kPositions[4][4] = { { -1, -1, 0, 1 }, { 1, -1, 0, 1 },
{ 1, 1, 0, 1 }, { -1, 1, 0, 1 } };
GLC(context_, context_->bindBuffer(GL_ARRAY_BUFFER, position_buffer_));
GLC(context_,
context_->bufferData(
GL_ARRAY_BUFFER, sizeof(kPositions), kPositions, GL_STATIC_DRAW));
GLC(context_, context_->bindBuffer(GL_ARRAY_BUFFER, 0));
blit_program_.reset(new BlitProgram(context_));
}
AcceleratedTextureCopier::~AcceleratedTextureCopier() {
if (blit_program_)
blit_program_->Cleanup(context_);
if (position_buffer_)
GLC(context_, context_->deleteBuffer(position_buffer_));
if (fbo_)
GLC(context_, context_->deleteFramebuffer(fbo_));
}
void AcceleratedTextureCopier::CopyTexture(Parameters parameters) {
TRACE_EVENT0("cc", "TextureCopier::CopyTexture");
GLC(context_, context_->disable(GL_SCISSOR_TEST));
// Note: this code does not restore the viewport, bound program, 2D texture,
// framebuffer, buffer or blend enable.
GLC(context_, context_->bindFramebuffer(GL_FRAMEBUFFER, fbo_));
GLC(context_,
context_->framebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D,
parameters.dest_texture,
0));
#if defined(OS_ANDROID)
// Clear destination to improve performance on tiling GPUs.
// TODO: Use EXT_discard_framebuffer or skip clearing if it isn't available.
GLC(context_, context_->clear(GL_COLOR_BUFFER_BIT));
#endif
GLC(context_,
context_->bindTexture(GL_TEXTURE_2D, parameters.source_texture));
GLC(context_,
context_->texParameteri(
GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
GLC(context_,
context_->texParameteri(
GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
if (!blit_program_->initialized())
blit_program_->Initialize(context_, using_bind_uniforms_);
// TODO: Use EXT_framebuffer_blit if available.
GLC(context_, context_->useProgram(blit_program_->program()));
const int kPositionAttribute = 0;
GLC(context_, context_->bindBuffer(GL_ARRAY_BUFFER, position_buffer_));
GLC(context_,
context_->vertexAttribPointer(
kPositionAttribute, 4, GL_FLOAT, false, 0, 0));
GLC(context_, context_->enableVertexAttribArray(kPositionAttribute));
GLC(context_, context_->bindBuffer(GL_ARRAY_BUFFER, 0));
GLC(context_,
context_->viewport(
0, 0, parameters.size.width(), parameters.size.height()));
GLC(context_, context_->disable(GL_BLEND));
GLC(context_, context_->drawArrays(GL_TRIANGLE_FAN, 0, 4));
GLC(context_,
context_->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
GLC(context_,
context_->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GLC(context_, context_->disableVertexAttribArray(kPositionAttribute));
GLC(context_, context_->useProgram(0));
GLC(context_,
context_->framebufferTexture2D(
GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0));
GLC(context_, context_->bindFramebuffer(GL_FRAMEBUFFER, 0));
GLC(context_, context_->bindTexture(GL_TEXTURE_2D, 0));
GLC(context_, context_->enable(GL_SCISSOR_TEST));
}
void AcceleratedTextureCopier::Flush() {
GLC(context_, context_->flush());
}
} // namespace cc
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