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      1 /*
      2  * Copyright (C) 2012 Adobe Systems Incorporated. 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
      9  *    copyright notice, this list of conditions and the following
     10  *    disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above
     12  *    copyright notice, this list of conditions and the following
     13  *    disclaimer in the documentation and/or other materials
     14  *    provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AS IS AND ANY
     17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
     20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     21  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     25  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #include "config.h"
     31 #include "platform/graphics/filters/custom/CustomFilterGlobalContext.h"
     32 
     33 #include "platform/graphics/GraphicsContext3D.h"
     34 #include "platform/graphics/filters/custom/CustomFilterValidatedProgram.h"
     35 
     36 namespace WebCore {
     37 
     38 CustomFilterGlobalContext::CustomFilterGlobalContext()
     39 {
     40 }
     41 
     42 CustomFilterGlobalContext::~CustomFilterGlobalContext()
     43 {
     44     for (CustomFilterValidatedProgramsMap::iterator iter = m_programs.begin(); iter != m_programs.end(); ++iter)
     45         iter->value->detachFromGlobalContext();
     46 }
     47 
     48 ANGLEPlatformBridge* CustomFilterGlobalContext::webglShaderValidator()
     49 {
     50     if (!m_webglShaderValidator)
     51         m_webglShaderValidator = createShaderValidator(SH_WEBGL_SPEC);
     52     return m_webglShaderValidator.get();
     53 }
     54 
     55 ANGLEPlatformBridge* CustomFilterGlobalContext::mixShaderValidator()
     56 {
     57     if (!m_mixShaderValidator)
     58         m_mixShaderValidator = createShaderValidator(SH_CSS_SHADERS_SPEC);
     59     return m_mixShaderValidator.get();
     60 }
     61 
     62 PassOwnPtr<ANGLEPlatformBridge> CustomFilterGlobalContext::createShaderValidator(ShShaderSpec shaderSpec)
     63 {
     64     OwnPtr<ANGLEPlatformBridge> validator = adoptPtr(new ANGLEPlatformBridge(SH_ESSL_OUTPUT, shaderSpec));
     65     ShBuiltInResources resources;
     66     ShInitBuiltInResources(&resources);
     67     validator->setResources(resources);
     68     return validator.release();
     69 }
     70 
     71 void CustomFilterGlobalContext::prepareContextIfNeeded()
     72 {
     73     if (m_context.get())
     74         return;
     75 
     76     GraphicsContext3D::Attributes attributes;
     77     attributes.preserveDrawingBuffer = true;
     78     attributes.premultipliedAlpha = false;
     79     attributes.shareResources = true;
     80     attributes.preferDiscreteGPU = true;
     81     m_context = GraphicsContext3D::create(attributes);
     82     if (!m_context)
     83         return;
     84     m_context->makeContextCurrent();
     85     m_context->enable(GL_DEPTH_TEST);
     86 }
     87 
     88 PassRefPtr<CustomFilterValidatedProgram> CustomFilterGlobalContext::getValidatedProgram(const CustomFilterProgramInfo& programInfo)
     89 {
     90     CustomFilterValidatedProgramsMap::iterator iter = m_programs.find(programInfo);
     91     if (iter != m_programs.end())
     92         return iter->value;
     93 
     94     RefPtr<CustomFilterValidatedProgram> validatedProgram = CustomFilterValidatedProgram::create(this, programInfo);
     95     m_programs.set(programInfo, validatedProgram.get());
     96     return validatedProgram.release();
     97 }
     98 
     99 void CustomFilterGlobalContext::removeValidatedProgram(const CustomFilterValidatedProgram* program)
    100 {
    101     CustomFilterValidatedProgramsMap::iterator iter = m_programs.find(program->programInfo());
    102     ASSERT_WITH_SECURITY_IMPLICATION(iter != m_programs.end());
    103     m_programs.remove(iter);
    104 
    105 #ifndef NDEBUG
    106     // Check that there's no way we could have the same program under a different key.
    107     for (iter = m_programs.begin(); iter != m_programs.end(); ++iter)
    108         ASSERT(iter->value != program);
    109 #endif
    110 }
    111 
    112 } // namespace WebCore
    113