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 "ProgramBinding.h"
31
32#include "GeometryBinding.h"
33#include "GraphicsContext.h"
34#include "GraphicsContext3D.h"
35#include "LayerRendererChromium.h"
36
37namespace WebCore {
38
39ProgramBindingBase::ProgramBindingBase(GraphicsContext3D* context)
40    : m_context(context)
41    , m_program(0)
42    , m_initialized(false)
43{
44}
45
46ProgramBindingBase::~ProgramBindingBase()
47{
48    if (m_program)
49        GLC(m_context, m_context->deleteProgram(m_program));
50}
51
52bool ProgramBindingBase::init(const String& vertexShader, const String& fragmentShader)
53{
54    m_program = createShaderProgram(vertexShader, fragmentShader);
55    if (!m_program) {
56        LOG_ERROR("Failed to create shader program");
57        return false;
58    }
59    return true;
60}
61
62unsigned ProgramBindingBase::loadShader(unsigned type, const String& shaderSource)
63{
64    unsigned shader = m_context->createShader(type);
65    if (!shader)
66        return 0;
67    String sourceString(shaderSource);
68    GLC(m_context, m_context->shaderSource(shader, sourceString));
69    GLC(m_context, m_context->compileShader(shader));
70    int compiled = 0;
71    GLC(m_context, m_context->getShaderiv(shader, GraphicsContext3D::COMPILE_STATUS, &compiled));
72    if (!compiled) {
73        GLC(m_context, m_context->deleteShader(shader));
74        return 0;
75    }
76    return shader;
77}
78
79unsigned ProgramBindingBase::createShaderProgram(const String& vertexShaderSource, const String& fragmentShaderSource)
80{
81    unsigned vertexShader = loadShader(GraphicsContext3D::VERTEX_SHADER, vertexShaderSource);
82    if (!vertexShader) {
83        LOG_ERROR("Failed to create vertex shader");
84        return 0;
85    }
86
87    unsigned fragmentShader = loadShader(GraphicsContext3D::FRAGMENT_SHADER, fragmentShaderSource);
88    if (!fragmentShader) {
89        GLC(m_context, m_context->deleteShader(vertexShader));
90        LOG_ERROR("Failed to create fragment shader");
91        return 0;
92    }
93
94    unsigned programObject = m_context->createProgram();
95    if (!programObject) {
96        LOG_ERROR("Failed to create shader program");
97        return 0;
98    }
99
100    GLC(m_context, m_context->attachShader(programObject, vertexShader));
101    GLC(m_context, m_context->attachShader(programObject, fragmentShader));
102
103    // Bind the common attrib locations.
104    GLC(m_context, m_context->bindAttribLocation(programObject, GeometryBinding::positionAttribLocation(), "a_position"));
105    GLC(m_context, m_context->bindAttribLocation(programObject, GeometryBinding::texCoordAttribLocation(), "a_texCoord"));
106
107    GLC(m_context, m_context->linkProgram(programObject));
108    int linked = 0;
109    GLC(m_context, m_context->getProgramiv(programObject, GraphicsContext3D::LINK_STATUS, &linked));
110    if (!linked) {
111        LOG_ERROR("Failed to link shader program");
112        GLC(m_context, m_context->deleteProgram(programObject));
113        return 0;
114    }
115
116    GLC(m_context, m_context->deleteShader(vertexShader));
117    GLC(m_context, m_context->deleteShader(fragmentShader));
118    return programObject;
119}
120
121} // namespace WebCore
122
123#endif // USE(ACCELERATED_COMPOSITING)
124