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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/texture_copier.h"
#include "base/debug/trace_event.h"
#include "build/build_config.h"
#include "cc/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 usingBindUniforms)
: m_context(context)
, m_usingBindUniforms(usingBindUniforms)
{
DCHECK(m_context);
GLC(m_context, m_fbo = m_context->createFramebuffer());
GLC(m_context, m_positionBuffer = m_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(m_context, m_context->bindBuffer(GL_ARRAY_BUFFER, m_positionBuffer));
GLC(m_context, m_context->bufferData(GL_ARRAY_BUFFER, sizeof(kPositions), kPositions, GL_STATIC_DRAW));
GLC(m_context, m_context->bindBuffer(GL_ARRAY_BUFFER, 0));
m_blitProgram.reset(new BlitProgram(m_context));
}
AcceleratedTextureCopier::~AcceleratedTextureCopier()
{
if (m_blitProgram)
m_blitProgram->cleanup(m_context);
if (m_positionBuffer)
GLC(m_context, m_context->deleteBuffer(m_positionBuffer));
if (m_fbo)
GLC(m_context, m_context->deleteFramebuffer(m_fbo));
}
void AcceleratedTextureCopier::copyTexture(Parameters parameters)
{
TRACE_EVENT0("cc", "TextureCopier::copyTexture");
GLC(m_context, m_context->disable(GL_SCISSOR_TEST));
// Note: this code does not restore the viewport, bound program, 2D texture, framebuffer, buffer or blend enable.
GLC(m_context, m_context->bindFramebuffer(GL_FRAMEBUFFER, m_fbo));
GLC(m_context, m_context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, parameters.destTexture, 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(m_context, m_context->clear(GL_COLOR_BUFFER_BIT));
#endif
GLC(m_context, m_context->bindTexture(GL_TEXTURE_2D, parameters.sourceTexture));
GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
if (!m_blitProgram->initialized())
m_blitProgram->initialize(m_context, m_usingBindUniforms);
// TODO: Use EXT_framebuffer_blit if available.
GLC(m_context, m_context->useProgram(m_blitProgram->program()));
const int kPositionAttribute = 0;
GLC(m_context, m_context->bindBuffer(GL_ARRAY_BUFFER, m_positionBuffer));
GLC(m_context, m_context->vertexAttribPointer(kPositionAttribute, 4, GL_FLOAT, false, 0, 0));
GLC(m_context, m_context->enableVertexAttribArray(kPositionAttribute));
GLC(m_context, m_context->bindBuffer(GL_ARRAY_BUFFER, 0));
GLC(m_context, m_context->viewport(0, 0, parameters.size.width(), parameters.size.height()));
GLC(m_context, m_context->disable(GL_BLEND));
GLC(m_context, m_context->drawArrays(GL_TRIANGLE_FAN, 0, 4));
GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
GLC(m_context, m_context->texParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GLC(m_context, m_context->disableVertexAttribArray(kPositionAttribute));
GLC(m_context, m_context->useProgram(0));
GLC(m_context, m_context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0));
GLC(m_context, m_context->bindFramebuffer(GL_FRAMEBUFFER, 0));
GLC(m_context, m_context->bindTexture(GL_TEXTURE_2D, 0));
GLC(m_context, m_context->enable(GL_SCISSOR_TEST));
}
void AcceleratedTextureCopier::flush()
{
GLC(m_context, m_context->flush());
}
} // namespace cc
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