cc/GeometryBinding.cpp

   1 // Copyright 2011 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 #if USE(ACCELERATED_COMPOSITING)
   8
   9 #include "GeometryBinding.h"
  10
  11 #include "CCRendererGL.h" // For the GLC() macro.
  12 #include "GraphicsContext3D.h"
  13 #include <public/WebGraphicsContext3D.h>
  14
  15 namespace cc {
  16
  17 GeometryBinding::GeometryBinding(WebKit::WebGraphicsContext3D* context, const FloatRect& quadVertexRect)
  18     : m_context(context)
  19     , m_quadVerticesVbo(0)
  20     , m_quadElementsVbo(0)
  21     , m_initialized(false)
  22 {
  23     // Vertex positions and texture coordinates for the 4 corners of a 1x1 quad.
  24     float vertices[] = { quadVertexRect.x(), quadVertexRect.maxY(), 0.0f, 0.0f,  1.0f,
  25                          quadVertexRect.x(), quadVertexRect.y(), 0.0f, 0.0f,  0.0f,
  26                          quadVertexRect.maxX(), quadVertexRect.y(), 0.0f, 1.0f,  0.0f,
  27                          quadVertexRect.maxX(),  quadVertexRect.maxY(), 0.0f, 1.0f,  1.0f };
  28     uint16_t indices[] = { 0, 1, 2, 0, 2, 3, // The two triangles that make up the layer quad.
  29                            0, 1, 2, 3}; // A line path for drawing the layer border.
  30
  31     GLC(m_context, m_quadVerticesVbo = m_context->createBuffer());
  32     GLC(m_context, m_quadElementsVbo = m_context->createBuffer());
  33     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, m_quadVerticesVbo));
  34     GLC(m_context, m_context->bufferData(GraphicsContext3D::ARRAY_BUFFER, sizeof(vertices), vertices, GraphicsContext3D::STATIC_DRAW));
  35     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ELEMENT_ARRAY_BUFFER, m_quadElementsVbo));
  36     GLC(m_context, m_context->bufferData(GraphicsContext3D::ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GraphicsContext3D::STATIC_DRAW));
  37
  38     m_initialized = true;
  39 }
  40
  41 GeometryBinding::~GeometryBinding()
  42 {
  43     GLC(m_context, m_context->deleteBuffer(m_quadVerticesVbo));
  44     GLC(m_context, m_context->deleteBuffer(m_quadElementsVbo));
  45 }
  46
  47 void GeometryBinding::prepareForDraw()
  48 {
  49     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, quadVerticesVbo()));
  50     GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ELEMENT_ARRAY_BUFFER, quadElementsVbo()));
  51     unsigned offset = 0;
  52     GLC(m_context, m_context->vertexAttribPointer(positionAttribLocation(), 3, GraphicsContext3D::FLOAT, false, 5 * sizeof(float), offset));
  53     offset += 3 * sizeof(float);
  54     GLC(m_context, m_context->vertexAttribPointer(texCoordAttribLocation(), 2, GraphicsContext3D::FLOAT, false, 5 * sizeof(float), offset));
  55     GLC(m_context, m_context->enableVertexAttribArray(positionAttribLocation()));
  56     GLC(m_context, m_context->enableVertexAttribArray(texCoordAttribLocation()));
  57 }
  58
  59 } // namespace cc
  60
  61 #endif // USE(ACCELERATED_COMPOSITING)