145 lines
5.2 KiB
C++
145 lines
5.2 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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Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#include "kwinglutils.h"
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#include "kwinglplatform.h"
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#include <dlfcn.h>
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#if HAVE_EPOXY_GLX
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#include <epoxy/glx.h>
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#endif
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// Resolves given function, using getProcAddress
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#define GL_RESOLVE( function ) \
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if (platformInterface == GlxPlatformInterface) \
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function = (function ## _func)getProcAddress( #function ); \
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else if (platformInterface == EglPlatformInterface) \
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function = (function ## _func)eglGetProcAddress( #function );
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// Same as above but tries to use function "symbolName"
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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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if (platformInterface == GlxPlatformInterface) { \
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function = (function ## _func)getProcAddress( #symbolName ); \
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} else if (platformInterface == EglPlatformInterface) { \
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function = (function ## _func)eglGetProcAddress( #symbolName ); \
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}
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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_MESA_swap_control
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glXSwapIntervalMESA_func glXSwapIntervalMESA;
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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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typedef void (*glXFuncPtr)();
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static glXFuncPtr getProcAddress(const char* name)
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{
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glXFuncPtr ret = nullptr;
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#if HAVE_EPOXY_GLX
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ret = glXGetProcAddress((const GLubyte*) name);
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#endif
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if (ret == nullptr)
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ret = (glXFuncPtr) dlsym(RTLD_DEFAULT, name);
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return ret;
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}
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void glxResolveFunctions()
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{
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if (hasGLExtension(QByteArrayLiteral("GLX_MESA_swap_control")))
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glXSwapIntervalMESA = (glXSwapIntervalMESA_func) getProcAddress("glXSwapIntervalMESA");
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else
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glXSwapIntervalMESA = nullptr;
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}
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void eglResolveFunctions()
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{
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}
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void glResolveFunctions(OpenGLPlatformInterface platformInterface)
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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 http://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 http://www.khronos.org/registry/gles/extensions/EXT/EXT_robustness.txt
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glGetGraphicsResetStatus = (glGetGraphicsResetStatus_func) eglGetProcAddress("glGetGraphicsResetStatusEXT");
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glReadnPixels = (glReadnPixels_func) eglGetProcAddress("glReadnPixelsEXT");
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glGetnUniformfv = (glGetnUniformfv_func) eglGetProcAddress("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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