cc/TextureCopier.cpp

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "config.h"
   6
   7 #include "TextureCopier.h"
   8
   9 #include "CCRendererGL.h" // For the GLC() macro.
  10 #include "GraphicsContext3D.h"
  11 #include "TraceEvent.h"
  12 #include <public/WebGraphicsContext3D.h>
  13
  14 namespace cc {
  15
  16 #if USE(ACCELERATED_COMPOSITING)
  17 AcceleratedTextureCopier::AcceleratedTextureCopier(WebKit::WebGraphicsContext3D* context, bool usingBindUniforms)
  18     : m_context(context)
  19     , m_usingBindUniforms(usingBindUniforms)
  20 {
  21     ASSERT(m_context);
  22     GLC(m_context, m_fbo = m_context->createFramebuffer());
  23     GLC(m_context, m_positionBuffer = m_context->createBuffer());
  24
  25     static const float kPositions[4][4] = {
  26         {-1, -1, 0, 1},
  27         { 1, -1, 0, 1},
  28         { 1, 1, 0, 1},
  29         {-1, 1, 0, 1}
  30     };
  31
  32     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, m_positionBuffer));
  33     GLC(m_context, m_context->bufferData(GraphicsContext3D::ARRAY_BUFFER, sizeof(kPositions), kPositions, GraphicsContext3D::STATIC_DRAW));
  34     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, 0));
  35
  36     m_blitProgram = adoptPtr(new BlitProgram(m_context));
  37 }
  38
  39 AcceleratedTextureCopier::~AcceleratedTextureCopier()
  40 {
  41     if (m_blitProgram)
  42         m_blitProgram->cleanup(m_context);
  43     if (m_positionBuffer)
  44         GLC(m_context, m_context->deleteBuffer(m_positionBuffer));
  45     if (m_fbo)
  46         GLC(m_context, m_context->deleteFramebuffer(m_fbo));
  47 }
  48
  49 void AcceleratedTextureCopier::copyTexture(Parameters parameters)
  50 {
  51     TRACE_EVENT0("cc", "TextureCopier::copyTexture");
  52
  53     // Note: this code does not restore the viewport, bound program, 2D texture, framebuffer, buffer or blend enable.
  54     GLC(m_context, m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo));
  55     GLC(m_context, m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, parameters.destTexture, 0));
  56
  57 #if OS(ANDROID)
  58     // Clear destination to improve performance on tiling GPUs.
  59     // TODO: Use EXT_discard_framebuffer or skip clearing if it isn't available.
  60     GLC(m_context, m_context->clear(GraphicsContext3D::COLOR_BUFFER_BIT));
  61 #endif
  62
  63     GLC(m_context, m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, parameters.sourceTexture));
  64     GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::NEAREST));
  65     GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::NEAREST));
  66
  67     if (!m_blitProgram->initialized())
  68         m_blitProgram->initialize(m_context, m_usingBindUniforms);
  69
  70     // TODO: Use EXT_framebuffer_blit if available.
  71     GLC(m_context, m_context->useProgram(m_blitProgram->program()));
  72
  73     const int kPositionAttribute = 0;
  74     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, m_positionBuffer));
  75     GLC(m_context, m_context->vertexAttribPointer(kPositionAttribute, 4, GraphicsContext3D::FLOAT, false, 0, 0));
  76     GLC(m_context, m_context->enableVertexAttribArray(kPositionAttribute));
  77     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, 0));
  78
  79     GLC(m_context, m_context->viewport(0, 0, parameters.size.width(), parameters.size.height()));
  80     GLC(m_context, m_context->disable(GraphicsContext3D::BLEND));
  81     GLC(m_context, m_context->drawArrays(GraphicsContext3D::TRIANGLE_FAN, 0, 4));
  82
  83     GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR));
  84     GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR));
  85     GLC(m_context, m_context->disableVertexAttribArray(kPositionAttribute));
  86
  87     GLC(m_context, m_context->useProgram(0));
  88
  89     GLC(m_context, m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, 0, 0));
  90     GLC(m_context, m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, 0));
  91     GLC(m_context, m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0));
  92 }
  93
  94 void AcceleratedTextureCopier::flush()
  95 {
  96     GLC(m_context, m_context->flush());
  97 }
  98
  99 }
 100
 101 #endif // USE(ACCELERATED_COMPOSITING)