101 lines
3.7 KiB
C++
101 lines
3.7 KiB
C++
#include "GLExt.h"
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#include <cstring>
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#include <iostream>
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#ifdef __APPLE__
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#include <OpenGL/OpenGL.h>
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#endif
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#ifdef __linux__
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#include <dlfcn.h>
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#endif
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#ifdef _WIN32
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PFNWGLGETEXTENSIONSSTRINGEXTPROC wglGetExtensionsStringEXT = NULL;
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PFNWGLSWAPINTERVALEXTPROC wglSwapIntervalEXT = NULL;
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PFNWGLGETSWAPINTERVALEXTPROC wglGetSwapIntervalEXT = NULL;
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bool GLExtSupported(const char *extension_name) {
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const GLubyte *extensions = glGetString(GL_EXTENSIONS);
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return (std::strstr((const char *)extensions, extension_name) != NULL);
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}
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#endif
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bool GLExt_initialized = false;
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void initGLExtensions() {
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if (GLExt_initialized) {
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return;
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}
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// const GLubyte *extensions = glGetString(GL_EXTENSIONS);
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// std::cout << std::endl << "Supported GL Extensions: " << std::endl << extensions << std::endl << std::endl;
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#ifdef __APPLE__
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const GLint interval = 1;
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#else
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const GLint interval = 2;
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#endif
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#ifdef _WIN32
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if (GLExtSupported("WGL_EXT_swap_control")) {
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std::cout << "Initializing WGL swap control extensions.." << std::endl;
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wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
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wglGetSwapIntervalEXT = (PFNWGLGETSWAPINTERVALEXTPROC) wglGetProcAddress("wglGetSwapIntervalEXT");
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wglSwapIntervalEXT(interval);
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}
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#endif
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#ifdef __APPLE__
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// OSX is just ON / OFF
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CGLSetParameter (CGLGetCurrentContext(), kCGLCPSwapInterval, &interval);
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#endif
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#ifdef __linux__
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dlopen("libglx.so",RTLD_LAZY);
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void (*glxSwapIntervalEXTFunc) (Display *dpy, GLXDrawable drawable, int interval) = 0;
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int (*glxSwapIntervalMESAFunc)(unsigned int interval) = 0;
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int (*glxSwapIntervalSGIFunc) (int interval) = 0;
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void (*DRI2SwapIntervalFunc) (Display *dpy, XID drawable, int interval) = 0;
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glxSwapIntervalEXTFunc = (void (*) (Display *dpy, GLXDrawable drawable, int interval)) dlsym(RTLD_DEFAULT,"glXSwapIntervalEXT");
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glxSwapIntervalMESAFunc = (int (*)(unsigned int interval)) dlsym(RTLD_DEFAULT,"glXSwapIntervalMESA");
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glxSwapIntervalSGIFunc = (int (*) (int interval)) dlsym(RTLD_DEFAULT,"glXSwapIntervalSGI");
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DRI2SwapIntervalFunc = (void (*) (Display *dpy, XID drawable, int interval)) dlsym(RTLD_DEFAULT,"DRI2SwapInterval");
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std::cout << "Available vertical sync SwapInterval functions: " << std::endl;
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std::cout << "\tglxSwapIntervalEXT: " << ((glxSwapIntervalEXTFunc != 0)?"Yes":"No") << std::endl;
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std::cout << "\tDRI2SwapInterval: " << ((DRI2SwapIntervalFunc != 0)?"Yes":"No") << std::endl;
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std::cout << "\tglxSwapIntervalMESA: " << ((glxSwapIntervalMESAFunc != 0)?"Yes":"No") << std::endl;
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std::cout << "\tglxSwapIntervalSGI: " << ((glxSwapIntervalSGIFunc != 0)?"Yes":"No") << std::endl;
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if (glxSwapIntervalEXTFunc) {
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Display *dpy = glXGetCurrentDisplay();
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GLXDrawable drawable = glXGetCurrentDrawable();
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glxSwapIntervalEXTFunc(dpy, drawable, interval);
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std::cout << "Using glxSwapIntervalEXT." << std::endl << std::endl;
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} else if (DRI2SwapIntervalFunc) {
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Display *dpy = glXGetCurrentDisplay();
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GLXDrawable drawable = glXGetCurrentDrawable();
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DRI2SwapIntervalFunc(dpy, drawable, interval);
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std::cout << "Using DRI2SwapInterval." << std::endl << std::endl;
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} else if (glxSwapIntervalMESAFunc) {
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glxSwapIntervalMESAFunc(interval);
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std::cout << "Using glxSwapIntervalMESA." << std::endl << std::endl;
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} else if (glxSwapIntervalSGIFunc) {
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glxSwapIntervalSGIFunc(interval);
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std::cout << "Using glxSwapIntervalSGI." << std::endl << std::endl;
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} else {
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std::cout << "No vertical sync swap interval functions available." << std::endl;
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}
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#endif
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GLExt_initialized = true;
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}
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