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      1 /*
      2  * Copyright (C) 2010 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 #if ENABLE(WEBGL)
     29 
     30 #include "ANGLEWebKitBridge.h"
     31 #include <wtf/OwnArrayPtr.h>
     32 
     33 namespace WebCore {
     34 
     35 
     36 ANGLEWebKitBridge::ANGLEWebKitBridge() :
     37     builtCompilers(false),
     38     m_fragmentCompiler(0),
     39     m_vertexCompiler(0)
     40 {
     41     ShInitialize();
     42 }
     43 
     44 ANGLEWebKitBridge::~ANGLEWebKitBridge()
     45 {
     46     cleanupCompilers();
     47 }
     48 
     49 void ANGLEWebKitBridge::cleanupCompilers()
     50 {
     51     if (m_fragmentCompiler)
     52         ShDestruct(m_fragmentCompiler);
     53     m_fragmentCompiler = 0;
     54     if (m_vertexCompiler)
     55         ShDestruct(m_vertexCompiler);
     56     m_vertexCompiler = 0;
     57 
     58     builtCompilers = false;
     59 }
     60 
     61 void ANGLEWebKitBridge::setResources(ShBuiltInResources resources)
     62 {
     63     // Resources are (possibly) changing - cleanup compilers if we had them already
     64     cleanupCompilers();
     65 
     66     m_resources = resources;
     67 }
     68 
     69 bool ANGLEWebKitBridge::validateShaderSource(const char* shaderSource, ANGLEShaderType shaderType, String& translatedShaderSource, String& shaderValidationLog)
     70 {
     71     if (!builtCompilers) {
     72         m_fragmentCompiler = ShConstructCompiler(SH_FRAGMENT_SHADER, SH_WEBGL_SPEC, &m_resources);
     73         m_vertexCompiler = ShConstructCompiler(SH_VERTEX_SHADER, SH_WEBGL_SPEC, &m_resources);
     74         if (!m_fragmentCompiler || !m_vertexCompiler) {
     75             cleanupCompilers();
     76             return false;
     77         }
     78 
     79         builtCompilers = true;
     80     }
     81 
     82     ShHandle compiler;
     83 
     84     if (shaderType == SHADER_TYPE_VERTEX)
     85         compiler = m_vertexCompiler;
     86     else
     87         compiler = m_fragmentCompiler;
     88 
     89     const char* const shaderSourceStrings[] = { shaderSource };
     90 
     91     bool validateSuccess = ShCompile(compiler, shaderSourceStrings, 1, SH_OBJECT_CODE);
     92     if (!validateSuccess) {
     93         int logSize = 0;
     94         ShGetInfo(compiler, SH_INFO_LOG_LENGTH, &logSize);
     95         if (logSize > 1) {
     96             OwnArrayPtr<char> logBuffer = adoptArrayPtr(new char[logSize]);
     97             if (logBuffer) {
     98                 ShGetInfoLog(compiler, logBuffer.get());
     99                 shaderValidationLog = logBuffer.get();
    100             }
    101         }
    102         return false;
    103     }
    104 
    105     int translationLength = 0;
    106     ShGetInfo(compiler, SH_OBJECT_CODE_LENGTH, &translationLength);
    107     if (translationLength > 1) {
    108         OwnArrayPtr<char> translationBuffer = adoptArrayPtr(new char[translationLength]);
    109         if (!translationBuffer)
    110             return false;
    111         ShGetObjectCode(compiler, translationBuffer.get());
    112         translatedShaderSource = translationBuffer.get();
    113     }
    114 
    115     return true;
    116 }
    117 
    118 }
    119 
    120 #endif // ENABLE(WEBGL)
    121