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/*
* Copyright (C) 2019 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) && USE(ANGLE)
#include "ExtensionsGLANGLE.h"
#include "ANGLEHeaders.h"
#include "GraphicsContextGLOpenGL.h"
namespace WebCore {
ExtensionsGLANGLE::ExtensionsGLANGLE(GraphicsContextGLOpenGL* context)
: m_initializedAvailableExtensions(false)
, m_context(context)
{
}
ExtensionsGLANGLE::~ExtensionsGLANGLE() = default;
bool ExtensionsGLANGLE::supports(const String& name)
{
if (!m_initializedAvailableExtensions) {
if (!m_context->makeContextCurrent())
return false;
initializeAvailableExtensions();
}
return supportsExtension(name);
}
void ExtensionsGLANGLE::ensureEnabled(const String& name)
{
// Enable support in ANGLE (if not enabled already).
if (m_requestableExtensions.contains(name) && !m_enabledExtensions.contains(name)) {
if (!m_context->makeContextCurrent())
return;
gl::RequestExtensionANGLE(name.ascii().data());
m_enabledExtensions.add(name);
if (name == "GL_CHROMIUM_color_buffer_float_rgba"_s)
m_webglColorBufferFloatRGBA = true;
else if (name == "GL_CHROMIUM_color_buffer_float_rgb"_s)
m_webglColorBufferFloatRGB = true;
}
}
bool ExtensionsGLANGLE::isEnabled(const String& name)
{
return m_availableExtensions.contains(name) || m_enabledExtensions.contains(name);
}
GLint ExtensionsGLANGLE::getGraphicsResetStatusARB()
{
return GraphicsContextGL::NO_ERROR;
}
String ExtensionsGLANGLE::getTranslatedShaderSourceANGLE(PlatformGLObject shader)
{
if (!m_context->makeContextCurrent())
return String();
int sourceLength = m_context->getShaderi(shader, GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE);
if (!sourceLength)
return emptyString();
Vector<GLchar> name(sourceLength); // GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE includes null termination.
GCGLint returnedLength = 0;
gl::GetTranslatedShaderSourceANGLE(shader, sourceLength, &returnedLength, name.data());
if (!returnedLength)
return emptyString();
// returnedLength does not include the null terminator.
ASSERT(returnedLength == sourceLength - 1);
return String(name.data(), returnedLength);
}
void ExtensionsGLANGLE::initializeAvailableExtensions()
{
String extensionsString = getExtensions();
for (auto& extension : extensionsString.split(' '))
m_availableExtensions.add(extension);
extensionsString = String(reinterpret_cast<const char*>(gl::GetString(GL_REQUESTABLE_EXTENSIONS_ANGLE)));
for (auto& extension : extensionsString.split(' '))
m_requestableExtensions.add(extension);
m_initializedAvailableExtensions = true;
}
bool ExtensionsGLANGLE::supportsExtension(const String& name)
{
return m_availableExtensions.contains(name) || m_requestableExtensions.contains(name);
}
void ExtensionsGLANGLE::drawBuffersEXT(GCGLSpan<const GCGLenum> bufs)
{
if (!m_context->makeContextCurrent())
return;
gl::DrawBuffersEXT(bufs.bufSize, bufs.data);
}
String ExtensionsGLANGLE::getExtensions()
{
return String(reinterpret_cast<const char*>(gl::GetString(GL_EXTENSIONS)));
}
GCGLenum ExtensionsGLANGLE::adjustWebGL1TextureInternalFormat(GCGLenum internalformat, GCGLenum format, GCGLenum type)
{
// The implementation of WEBGL_color_buffer_float for WebGL 1.0 / ES 2.0 requires a sized
// internal format. Adjust it if necessary at this lowest level.
if (type == GL_FLOAT) {
if (m_webglColorBufferFloatRGBA && format == GL_RGBA && internalformat == GL_RGBA)
return GL_RGBA32F;
if (m_webglColorBufferFloatRGB && format == GL_RGB && internalformat == GL_RGB)
return GL_RGB32F;
}
return internalformat;
}
} // namespace WebCore
#endif // ENABLE(WEBGL) && USE(ANGLE)
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