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
36 namespace WebCore {
37
GeometryBinding(GraphicsContext3D * context)38 GeometryBinding::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
~GeometryBinding()62 GeometryBinding::~GeometryBinding()
63 {
64 GLC(m_context, m_context->deleteBuffer(m_quadVerticesVbo));
65 GLC(m_context, m_context->deleteBuffer(m_quadElementsVbo));
66 }
67
prepareForDraw()68 void 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