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      1 /*
      2  * Copyright (C) 2009 Apple 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  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 
     28 #include "core/html/canvas/WebGLProgram.h"
     29 
     30 #include "core/html/canvas/WebGLRenderingContextBase.h"
     31 
     32 namespace WebCore {
     33 
     34 PassRefPtr<WebGLProgram> WebGLProgram::create(WebGLRenderingContextBase* ctx)
     35 {
     36     return adoptRef(new WebGLProgram(ctx));
     37 }
     38 
     39 WebGLProgram::WebGLProgram(WebGLRenderingContextBase* ctx)
     40     : WebGLSharedObject(ctx)
     41     , m_linkStatus(false)
     42     , m_linkCount(0)
     43     , m_infoValid(true)
     44 {
     45     ScriptWrappable::init(this);
     46     setObject(ctx->webContext()->createProgram());
     47 }
     48 
     49 WebGLProgram::~WebGLProgram()
     50 {
     51     deleteObject(0);
     52 }
     53 
     54 void WebGLProgram::deleteObjectImpl(blink::WebGraphicsContext3D* context3d, Platform3DObject obj)
     55 {
     56     context3d->deleteProgram(obj);
     57     if (m_vertexShader) {
     58         m_vertexShader->onDetached(context3d);
     59         m_vertexShader = nullptr;
     60     }
     61     if (m_fragmentShader) {
     62         m_fragmentShader->onDetached(context3d);
     63         m_fragmentShader = nullptr;
     64     }
     65 }
     66 
     67 unsigned WebGLProgram::numActiveAttribLocations()
     68 {
     69     cacheInfoIfNeeded();
     70     return m_activeAttribLocations.size();
     71 }
     72 
     73 GLint WebGLProgram::getActiveAttribLocation(GLuint index)
     74 {
     75     cacheInfoIfNeeded();
     76     if (index >= numActiveAttribLocations())
     77         return -1;
     78     return m_activeAttribLocations[index];
     79 }
     80 
     81 bool WebGLProgram::isUsingVertexAttrib0()
     82 {
     83     cacheInfoIfNeeded();
     84     for (unsigned ii = 0; ii < numActiveAttribLocations(); ++ii) {
     85         if (!getActiveAttribLocation(ii))
     86             return true;
     87     }
     88     return false;
     89 }
     90 
     91 bool WebGLProgram::linkStatus()
     92 {
     93     cacheInfoIfNeeded();
     94     return m_linkStatus;
     95 }
     96 
     97 void WebGLProgram::increaseLinkCount()
     98 {
     99     ++m_linkCount;
    100     m_infoValid = false;
    101 }
    102 
    103 WebGLShader* WebGLProgram::getAttachedShader(GLenum type)
    104 {
    105     switch (type) {
    106     case GL_VERTEX_SHADER:
    107         return m_vertexShader.get();
    108     case GL_FRAGMENT_SHADER:
    109         return m_fragmentShader.get();
    110     default:
    111         return 0;
    112     }
    113 }
    114 
    115 bool WebGLProgram::attachShader(WebGLShader* shader)
    116 {
    117     if (!shader || !shader->object())
    118         return false;
    119     switch (shader->type()) {
    120     case GL_VERTEX_SHADER:
    121         if (m_vertexShader)
    122             return false;
    123         m_vertexShader = shader;
    124         return true;
    125     case GL_FRAGMENT_SHADER:
    126         if (m_fragmentShader)
    127             return false;
    128         m_fragmentShader = shader;
    129         return true;
    130     default:
    131         return false;
    132     }
    133 }
    134 
    135 bool WebGLProgram::detachShader(WebGLShader* shader)
    136 {
    137     if (!shader || !shader->object())
    138         return false;
    139     switch (shader->type()) {
    140     case GL_VERTEX_SHADER:
    141         if (m_vertexShader != shader)
    142             return false;
    143         m_vertexShader = nullptr;
    144         return true;
    145     case GL_FRAGMENT_SHADER:
    146         if (m_fragmentShader != shader)
    147             return false;
    148         m_fragmentShader = nullptr;
    149         return true;
    150     default:
    151         return false;
    152     }
    153 }
    154 
    155 void WebGLProgram::cacheActiveAttribLocations(blink::WebGraphicsContext3D* context3d)
    156 {
    157     m_activeAttribLocations.clear();
    158 
    159     GLint numAttribs = 0;
    160     context3d->getProgramiv(object(), GL_ACTIVE_ATTRIBUTES, &numAttribs);
    161     m_activeAttribLocations.resize(static_cast<size_t>(numAttribs));
    162     for (int i = 0; i < numAttribs; ++i) {
    163         blink::WebGraphicsContext3D::ActiveInfo info;
    164         context3d->getActiveAttrib(object(), i, info);
    165         m_activeAttribLocations[i] = context3d->getAttribLocation(object(), info.name.utf8().data());
    166     }
    167 }
    168 
    169 void WebGLProgram::cacheInfoIfNeeded()
    170 {
    171     if (m_infoValid)
    172         return;
    173 
    174     if (!object())
    175         return;
    176 
    177     blink::WebGraphicsContext3D* context = getAWebGraphicsContext3D();
    178     if (!context)
    179         return;
    180     GLint linkStatus = 0;
    181     context->getProgramiv(object(), GL_LINK_STATUS, &linkStatus);
    182     m_linkStatus = linkStatus;
    183     if (m_linkStatus)
    184         cacheActiveAttribLocations(context);
    185     m_infoValid = true;
    186 }
    187 
    188 }
    189