Home | History | Annotate | Download | only in gtk 
      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2011 Igalia S.L.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      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 COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "GraphicsContext3D.h"
     29 
     30 #if ENABLE(WEBGL)
     31 
     32 #include "Extensions3DOpenGL.h"
     33 #include "GraphicsContext3DInternal.h"
     34 #include "OpenGLShims.h"
     35 #include "ShaderLang.h"
     36 #include <wtf/NotFound.h>
     37 
     38 namespace WebCore {
     39 
     40 PassRefPtr<GraphicsContext3D> GraphicsContext3D::create(GraphicsContext3D::Attributes attributes, HostWindow* hostWindow, GraphicsContext3D::RenderStyle renderStyle)
     41 {
     42     // This implementation doesn't currently support rendering directly to the HostWindow.
     43     if (renderStyle == RenderDirectlyToHostWindow)
     44         return 0;
     45 
     46     GraphicsContext3DInternal* internal = GraphicsContext3DInternal::create();
     47     if (!internal)
     48         return 0;
     49 
     50     RefPtr<GraphicsContext3D> context = adoptRef(new GraphicsContext3D(attributes, hostWindow, false));
     51     context->m_internal.set(internal);
     52     return context.release();
     53 }
     54 
     55 GraphicsContext3D::GraphicsContext3D(GraphicsContext3D::Attributes attributes, HostWindow*, bool)
     56     : m_currentWidth(0)
     57     , m_currentHeight(0)
     58     , m_attrs(attributes)
     59     , m_texture(0)
     60     , m_fbo(0)
     61     , m_depthStencilBuffer(0)
     62     , m_boundFBO(0)
     63     , m_multisampleFBO(0)
     64     , m_multisampleDepthStencilBuffer(0)
     65     , m_multisampleColorBuffer(0)
     66 {
     67     GraphicsContext3DInternal::addActiveGraphicsContext(this);
     68 
     69     validateAttributes();
     70 
     71     // Create a texture to render into.
     72     ::glGenTextures(1, &m_texture);
     73     ::glBindTexture(GL_TEXTURE_2D, m_texture);
     74     ::glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     75     ::glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     76     ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
     77     ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
     78     ::glBindTexture(GL_TEXTURE_2D, 0);
     79 
     80     // Create an FBO.
     81     ::glGenFramebuffersEXT(1, &m_fbo);
     82     ::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
     83 
     84     m_boundFBO = m_fbo;
     85     if (!m_attrs.antialias && (m_attrs.stencil || m_attrs.depth))
     86         ::glGenRenderbuffersEXT(1, &m_depthStencilBuffer);
     87 
     88     // Create a multisample FBO.
     89     if (m_attrs.antialias) {
     90         ::glGenFramebuffersEXT(1, &m_multisampleFBO);
     91         ::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_multisampleFBO);
     92         m_boundFBO = m_multisampleFBO;
     93         ::glGenRenderbuffersEXT(1, &m_multisampleColorBuffer);
     94         if (m_attrs.stencil || m_attrs.depth)
     95             ::glGenRenderbuffersEXT(1, &m_multisampleDepthStencilBuffer);
     96     }
     97 
     98     // ANGLE initialization.
     99     ShBuiltInResources ANGLEResources;
    100     ShInitBuiltInResources(&ANGLEResources);
    101 
    102     getIntegerv(GraphicsContext3D::MAX_VERTEX_ATTRIBS, &ANGLEResources.MaxVertexAttribs);
    103     getIntegerv(GraphicsContext3D::MAX_VERTEX_UNIFORM_VECTORS, &ANGLEResources.MaxVertexUniformVectors);
    104     getIntegerv(GraphicsContext3D::MAX_VARYING_VECTORS, &ANGLEResources.MaxVaryingVectors);
    105     getIntegerv(GraphicsContext3D::MAX_VERTEX_TEXTURE_IMAGE_UNITS, &ANGLEResources.MaxVertexTextureImageUnits);
    106     getIntegerv(GraphicsContext3D::MAX_COMBINED_TEXTURE_IMAGE_UNITS, &ANGLEResources.MaxCombinedTextureImageUnits);
    107     getIntegerv(GraphicsContext3D::MAX_TEXTURE_IMAGE_UNITS, &ANGLEResources.MaxTextureImageUnits);
    108     getIntegerv(GraphicsContext3D::MAX_FRAGMENT_UNIFORM_VECTORS, &ANGLEResources.MaxFragmentUniformVectors);
    109 
    110     // Always set to 1 for OpenGL ES.
    111     ANGLEResources.MaxDrawBuffers = 1;
    112     m_compiler.setResources(ANGLEResources);
    113 
    114     ::glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
    115     ::glEnable(GL_POINT_SPRITE);
    116     ::glClearColor(0, 0, 0, 0);
    117 }
    118 
    119 GraphicsContext3D::~GraphicsContext3D()
    120 {
    121     GraphicsContext3DInternal::removeActiveGraphicsContext(this);
    122     if (!m_internal->m_context)
    123         return;
    124 
    125     makeContextCurrent();
    126     ::glDeleteTextures(1, &m_texture);
    127     if (m_attrs.antialias) {
    128         ::glDeleteRenderbuffersEXT(1, &m_multisampleColorBuffer);
    129         if (m_attrs.stencil || m_attrs.depth)
    130             ::glDeleteRenderbuffersEXT(1, &m_multisampleDepthStencilBuffer);
    131         ::glDeleteFramebuffersEXT(1, &m_multisampleFBO);
    132     } else {
    133         if (m_attrs.stencil || m_attrs.depth)
    134             ::glDeleteRenderbuffersEXT(1, &m_depthStencilBuffer);
    135     }
    136     ::glDeleteFramebuffersEXT(1, &m_fbo);
    137 }
    138 
    139 void GraphicsContext3D::makeContextCurrent()
    140 {
    141     if (!m_internal)
    142         return;
    143     m_internal->makeContextCurrent();
    144 }
    145 
    146 PlatformGraphicsContext3D GraphicsContext3D::platformGraphicsContext3D()
    147 {
    148     return m_internal->m_context;
    149 }
    150 
    151 bool GraphicsContext3D::isGLES2Compliant() const
    152 {
    153     return false;
    154 }
    155 
    156 }
    157 
    158 #endif // ENABLE(WEBGL)
    159