1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27
28#if USE(ACCELERATED_COMPOSITING)
29
30#include "GeometryBinding.h"
31
32#include "GraphicsContext.h"
33#include "GraphicsContext3D.h"
34#include "LayerRendererChromium.h"
35
36namespace WebCore {
37
38GeometryBinding::GeometryBinding(GraphicsContext3D* context)
39    : m_context(context)
40    , m_quadVerticesVbo(0)
41    , m_quadElementsVbo(0)
42    , m_initialized(false)
43{
44    // Vertex positions and texture coordinates for the 4 corners of a 1x1 quad.
45    float vertices[] = { -0.5f,  0.5f, 0.0f, 0.0f,  1.0f,
46                         -0.5f, -0.5f, 0.0f, 0.0f,  0.0f,
47                         0.5f, -0.5f, 0.0f, 1.0f,  0.0f,
48                         0.5f,  0.5f, 0.0f, 1.0f,  1.0f };
49    uint16_t indices[] = { 0, 1, 2, 0, 2, 3, // The two triangles that make up the layer quad.
50                           0, 1, 2, 3}; // A line path for drawing the layer border.
51
52    GLC(m_context, m_quadVerticesVbo = m_context->createBuffer());
53    GLC(m_context, m_quadElementsVbo = m_context->createBuffer());
54    GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, m_quadVerticesVbo));
55    GLC(m_context, m_context->bufferData(GraphicsContext3D::ARRAY_BUFFER, sizeof(vertices), vertices, GraphicsContext3D::STATIC_DRAW));
56    GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ELEMENT_ARRAY_BUFFER, m_quadElementsVbo));
57    GLC(m_context, m_context->bufferData(GraphicsContext3D::ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GraphicsContext3D::STATIC_DRAW));
58
59    m_initialized = true;
60}
61
62GeometryBinding::~GeometryBinding()
63{
64    GLC(m_context, m_context->deleteBuffer(m_quadVerticesVbo));
65    GLC(m_context, m_context->deleteBuffer(m_quadElementsVbo));
66}
67
68void GeometryBinding::prepareForDraw()
69{
70    GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ARRAY_BUFFER, quadVerticesVbo()));
71    GLC(m_context, m_context->bindBuffer(GraphicsContext3D::ELEMENT_ARRAY_BUFFER, quadElementsVbo()));
72    unsigned offset = 0;
73    GLC(m_context, m_context->vertexAttribPointer(positionAttribLocation(), 3, GraphicsContext3D::FLOAT, false, 5 * sizeof(float), offset));
74    offset += 3 * sizeof(float);
75    GLC(m_context, m_context->vertexAttribPointer(texCoordAttribLocation(), 2, GraphicsContext3D::FLOAT, false, 5 * sizeof(float), offset));
76    GLC(m_context, m_context->enableVertexAttribArray(positionAttribLocation()));
77    GLC(m_context, m_context->enableVertexAttribArray(texCoordAttribLocation()));
78}
79
80} // namespace WebCore
81
82#endif // USE(ACCELERATED_COMPOSITING)
83