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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEBGL)
#include "Extensions3DOpenGL.h"
#include "GraphicsContext3D.h"
#include <wtf/Vector.h>
#if PLATFORM(MAC)
#include "ANGLE/ShaderLang.h"
#include <OpenGL/gl.h>
#elif PLATFORM(GTK)
#include "OpenGLShims.h"
#endif
namespace WebCore {
Extensions3DOpenGL::Extensions3DOpenGL(GraphicsContext3D* context)
: m_initializedAvailableExtensions(false)
, m_context(context)
{
}
Extensions3DOpenGL::~Extensions3DOpenGL()
{
}
bool Extensions3DOpenGL::supports(const String& name)
{
// Note on support for BGRA:
//
// For OpenGL ES2.0, requires checking for
// GL_EXT_texture_format_BGRA8888 and GL_EXT_read_format_bgra.
// For desktop GL, BGRA has been supported since OpenGL 1.2.
//
// However, note that the GL ES2 extension requires the
// internalFormat to glTexImage2D() be GL_BGRA, while desktop GL
// will not accept GL_BGRA (must be GL_RGBA), so this must be
// checked on each platform. Desktop GL offers neither
// GL_EXT_texture_format_BGRA8888 or GL_EXT_read_format_bgra, so
// treat them as unsupported here.
if (!m_initializedAvailableExtensions) {
String extensionsString(reinterpret_cast<const char*>(::glGetString(GL_EXTENSIONS)));
Vector<String> availableExtensions;
extensionsString.split(" ", availableExtensions);
for (size_t i = 0; i < availableExtensions.size(); ++i)
m_availableExtensions.add(availableExtensions[i]);
m_initializedAvailableExtensions = true;
}
// GL_ANGLE_framebuffer_blit and GL_ANGLE_framebuffer_multisample are "fake". They are implemented using other
// extensions. In particular GL_EXT_framebuffer_blit and GL_EXT_framebuffer_multisample
if (name == "GL_ANGLE_framebuffer_blit")
return m_availableExtensions.contains("GL_EXT_framebuffer_blit");
if (name == "GL_ANGLE_framebuffer_multisample")
return m_availableExtensions.contains("GL_EXT_framebuffer_multisample");
// Desktop GL always supports GL_OES_rgb8_rgba8.
if (name == "GL_OES_rgb8_rgba8")
return true;
// If GL_ARB_texture_float is available then we report GL_OES_texture_float and
// GL_OES_texture_half_float as available.
if (name == "GL_OES_texture_float" || name == "GL_OES_texture_half_float")
return m_availableExtensions.contains("GL_ARB_texture_float");
// GL_OES_vertex_array_object
if (name == "GL_OES_vertex_array_object")
return m_availableExtensions.contains("GL_APPLE_vertex_array_object");
// Desktop GL always supports the standard derivative functions
if (name == "GL_OES_standard_derivatives")
return true;
return m_availableExtensions.contains(name);
}
void Extensions3DOpenGL::ensureEnabled(const String& name)
{
#if PLATFORM(MAC)
if (name == "GL_OES_standard_derivatives") {
// Enable support in ANGLE (if not enabled already)
ANGLEWebKitBridge& compiler = m_context->m_compiler;
ShBuiltInResources ANGLEResources = compiler.getResources();
if (!ANGLEResources.OES_standard_derivatives) {
ANGLEResources.OES_standard_derivatives = 1;
compiler.setResources(ANGLEResources);
}
}
#else
ASSERT_UNUSED(name, supports(name));
#endif
}
bool Extensions3DOpenGL::isEnabled(const String& name)
{
#if PLATFORM(MAC)
if (name == "GL_OES_standard_derivatives") {
ANGLEWebKitBridge& compiler = m_context->m_compiler;
return compiler.getResources().OES_standard_derivatives;
}
#endif
return supports(name);
}
int Extensions3DOpenGL::getGraphicsResetStatusARB()
{
return GraphicsContext3D::NO_ERROR;
}
void Extensions3DOpenGL::blitFramebuffer(long srcX0, long srcY0, long srcX1, long srcY1, long dstX0, long dstY0, long dstX1, long dstY1, unsigned long mask, unsigned long filter)
{
::glBlitFramebufferEXT(srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, mask, filter);
}
void Extensions3DOpenGL::renderbufferStorageMultisample(unsigned long target, unsigned long samples, unsigned long internalformat, unsigned long width, unsigned long height)
{
::glRenderbufferStorageMultisampleEXT(target, samples, internalformat, width, height);
}
Platform3DObject Extensions3DOpenGL::createVertexArrayOES()
{
m_context->makeContextCurrent();
#if !PLATFORM(GTK) && defined(GL_APPLE_vertex_array_object) && GL_APPLE_vertex_array_object
GLuint array = 0;
glGenVertexArraysAPPLE(1, &array);
return array;
#else
return 0;
#endif
}
void Extensions3DOpenGL::deleteVertexArrayOES(Platform3DObject array)
{
if (!array)
return;
m_context->makeContextCurrent();
#if !PLATFORM(GTK) && defined(GL_APPLE_vertex_array_object) && GL_APPLE_vertex_array_object
glDeleteVertexArraysAPPLE(1, &array);
#endif
}
GC3Dboolean Extensions3DOpenGL::isVertexArrayOES(Platform3DObject array)
{
if (!array)
return GL_FALSE;
m_context->makeContextCurrent();
#if !PLATFORM(GTK) && defined(GL_APPLE_vertex_array_object) && GL_APPLE_vertex_array_object
return glIsVertexArrayAPPLE(array);
#else
return GL_FALSE;
#endif
}
void Extensions3DOpenGL::bindVertexArrayOES(Platform3DObject array)
{
if (!array)
return;
m_context->makeContextCurrent();
#if !PLATFORM(GTK) && defined(GL_APPLE_vertex_array_object) && GL_APPLE_vertex_array_object
glBindVertexArrayAPPLE(array);
#endif
}
} // namespace WebCore
#endif // ENABLE(WEBGL)
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