92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2007 Rivo Laks <rivolaks@hot.ee>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "kwinglutils.h"
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#include "kwinglplatform.h"
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// Resolves given function, using getProcAddress
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// Useful when functionality is defined in an extension with a different name
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#define GL_RESOLVE_WITH_EXT( function, symbolName ) \
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function = (function ## _func)resolveFunction( #symbolName );
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namespace KWin
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{
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static GLenum GetGraphicsResetStatus();
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static void ReadnPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
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GLenum type, GLsizei bufSize, GLvoid *data);
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static void GetnUniformfv(GLuint program, GLint location, GLsizei bufSize, GLfloat *params);
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// GL_ARB_robustness / GL_EXT_robustness
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glGetGraphicsResetStatus_func glGetGraphicsResetStatus;
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glReadnPixels_func glReadnPixels;
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glGetnUniformfv_func glGetnUniformfv;
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void glResolveFunctions(const std::function<resolveFuncPtr(const char*)> &resolveFunction)
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{
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const bool haveArbRobustness = hasGLExtension(QByteArrayLiteral("GL_ARB_robustness"));
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const bool haveExtRobustness = hasGLExtension(QByteArrayLiteral("GL_EXT_robustness"));
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bool robustContext = false;
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if (GLPlatform::instance()->isGLES()) {
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if (haveExtRobustness) {
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GLint value = 0;
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glGetIntegerv(GL_CONTEXT_ROBUST_ACCESS_EXT, &value);
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robustContext = (value != 0);
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}
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} else {
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if (haveArbRobustness) {
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if (hasGLVersion(3, 0)) {
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GLint value = 0;
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glGetIntegerv(GL_CONTEXT_FLAGS, &value);
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if (value & GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB) {
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robustContext = true;
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}
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} else {
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robustContext = true;
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}
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}
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}
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if (robustContext && haveArbRobustness) {
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// See https://www.opengl.org/registry/specs/ARB/robustness.txt
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GL_RESOLVE_WITH_EXT(glGetGraphicsResetStatus, glGetGraphicsResetStatusARB);
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GL_RESOLVE_WITH_EXT(glReadnPixels, glReadnPixelsARB);
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GL_RESOLVE_WITH_EXT(glGetnUniformfv, glGetnUniformfvARB);
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} else if (robustContext && haveExtRobustness) {
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// See https://www.khronos.org/registry/gles/extensions/EXT/EXT_robustness.txt
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glGetGraphicsResetStatus = (glGetGraphicsResetStatus_func) resolveFunction("glGetGraphicsResetStatusEXT");
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glReadnPixels = (glReadnPixels_func) resolveFunction("glReadnPixelsEXT");
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glGetnUniformfv = (glGetnUniformfv_func) resolveFunction("glGetnUniformfvEXT");
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} else {
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glGetGraphicsResetStatus = KWin::GetGraphicsResetStatus;
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glReadnPixels = KWin::ReadnPixels;
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glGetnUniformfv = KWin::GetnUniformfv;
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}
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}
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static GLenum GetGraphicsResetStatus()
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{
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return GL_NO_ERROR;
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}
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static void ReadnPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format,
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GLenum type, GLsizei bufSize, GLvoid *data)
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{
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Q_UNUSED(bufSize)
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glReadPixels(x, y, width, height, format, type, data);
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}
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static void GetnUniformfv(GLuint program, GLint location, GLsizei bufSize, GLfloat *params)
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{
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Q_UNUSED(bufSize)
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glGetUniformfv(program, location, params);
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}
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} // namespace
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