1 files changed, 101 insertions, 0 deletions
diff --git a/cc/texture_copier.cc b/cc/texture_copier.cc
new file mode 100644
index 0000000..b0db144
--- /dev/null
+++ b/cc/texture_copier.cc
@@ -0,0 +1,101 @@
+// 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 "config.h"
+
+#include "TextureCopier.h"
+
+#include "CCRendererGL.h" // For the GLC() macro.
+#include "GraphicsContext3D.h"
+#include "TraceEvent.h"
+#include <public/WebGraphicsContext3D.h>
+
+namespace cc {
+
+#if USE(ACCELERATED_COMPOSITING)
+AcceleratedTextureCopier::AcceleratedTextureCopier(WebKit::WebGraphicsContext3D* context, bool usingBindUniforms)
+    : m_context(context)
+    , m_usingBindUniforms(usingBindUniforms)
+{
+    ASSERT(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(GraphicsContext3D::ARRAY_BUFFER, m_positionBuffer));
+    GLC(m_context, m_context->bufferData(GraphicsContext3D::ARRAY_BUFFER, sizeof(kPositions), kPositions, GraphicsContext3D::STATIC_DRAW));
+    GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, 0));
+
+    m_blitProgram = adoptPtr(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");
+
+    // Note: this code does not restore the viewport, bound program, 2D texture, framebuffer, buffer or blend enable.
+    GLC(m_context, m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo));
+    GLC(m_context, m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, parameters.destTexture, 0));
+
+#if 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(GraphicsContext3D::COLOR_BUFFER_BIT));
+#endif
+
+    GLC(m_context, m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, parameters.sourceTexture));
+    GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::NEAREST));
+    GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::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(GraphicsContext3D::ARRAY_BUFFER, m_positionBuffer));
+    GLC(m_context, m_context->vertexAttribPointer(kPositionAttribute, 4, GraphicsContext3D::FLOAT, false, 0, 0));
+    GLC(m_context, m_context->enableVertexAttribArray(kPositionAttribute));
+    GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, 0));
+
+    GLC(m_context, m_context->viewport(0, 0, parameters.size.width(), parameters.size.height()));
+    GLC(m_context, m_context->disable(GraphicsContext3D::BLEND));
+    GLC(m_context, m_context->drawArrays(GraphicsContext3D::TRIANGLE_FAN, 0, 4));
+
+    GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR));
+    GLC(m_context, m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR));
+    GLC(m_context, m_context->disableVertexAttribArray(kPositionAttribute));
+
+    GLC(m_context, m_context->useProgram(0));
+
+    GLC(m_context, m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, 0, 0));
+    GLC(m_context, m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, 0));
+    GLC(m_context, m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0));
+}
+
+void AcceleratedTextureCopier::flush()
+{
+    GLC(m_context, m_context->flush());
+}
+
+}
+
+#endif // USE(ACCELERATED_COMPOSITING)