Mercurial > sdl-ios-xcode
view test/testdyngl.c @ 1077:f122afdfa025
The Darwin/MacOSX joystick code is largely copied from the HID Utilities
package...make the symbols defined by HID Utilities static inside SDL so that
an app can link against their own copy of this package without symbol clash.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Wed, 15 Jun 2005 23:41:57 +0000 |
parents | 8e20c48a9c13 |
children | be9c9c8f6d53 |
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/* * Small SDL example to demonstrate dynamically loading * OpenGL lib and functions * * (FYI it was supposed to look like snow in the wind or something...) * * Compile with : * gcc testdyngl.c `sdl-config --libs --cflags` -o testdyngl -DHAVE_OPENGL * * You can specify a different OpenGL lib on the command line, i.e. : * ./testdyngl /usr/X11R6/lib/libGL.so.1.2 * or * ./testdyngl /usr/lib/libGL.so.1.0.4496 * */ #include <stdio.h> #include <stdlib.h> #include "SDL.h" #ifdef HAVE_OPENGL #include "SDL_opengl.h" void* get_funcaddr(const char* p) { void* f=SDL_GL_GetProcAddress(p); if (f) { return f; } else { printf("Unable to get function pointer for %s\n",p); exit(1); } } typedef struct { void(APIENTRY*glBegin)(GLenum); void(APIENTRY*glEnd)(); void(APIENTRY*glVertex3f)(GLfloat, GLfloat, GLfloat); void(APIENTRY*glClearColor)(GLfloat, GLfloat, GLfloat, GLfloat); void(APIENTRY*glClear)(GLbitfield); void(APIENTRY*glDisable)(GLenum); void(APIENTRY*glEnable)(GLenum); void(APIENTRY*glColor4ub)(GLubyte,GLubyte,GLubyte,GLubyte); void(APIENTRY*glPointSize)(GLfloat); void(APIENTRY*glHint)(GLenum,GLenum); void(APIENTRY*glBlendFunc)(GLenum,GLenum); void(APIENTRY*glMatrixMode)(GLenum); void(APIENTRY*glLoadIdentity)(); void(APIENTRY*glOrtho)(GLdouble,GLdouble,GLdouble,GLdouble,GLdouble,GLdouble); void(APIENTRY*glRotatef)(GLfloat,GLfloat,GLfloat,GLfloat); void(APIENTRY*glViewport)(GLint,GLint,GLsizei,GLsizei); void(APIENTRY*glFogf)(GLenum,GLfloat); } glfuncs; void init_glfuncs(glfuncs* f) { f->glBegin=get_funcaddr("glBegin"); f->glEnd=get_funcaddr("glEnd"); f->glVertex3f=get_funcaddr("glVertex3f"); f->glClearColor=get_funcaddr("glClearColor"); f->glClear=get_funcaddr("glClear"); f->glDisable=get_funcaddr("glDisable"); f->glEnable=get_funcaddr("glEnable"); f->glColor4ub=get_funcaddr("glColor4ub"); f->glPointSize=get_funcaddr("glPointSize"); f->glHint=get_funcaddr("glHint"); f->glBlendFunc=get_funcaddr("glBlendFunc"); f->glMatrixMode=get_funcaddr("glMatrixMode"); f->glLoadIdentity=get_funcaddr("glLoadIdentity"); f->glOrtho=get_funcaddr("glOrtho"); f->glRotatef=get_funcaddr("glRotatef"); f->glViewport=get_funcaddr("glViewport"); f->glFogf=get_funcaddr("glFogf"); } #define NB_PIXELS 1000 int main(int argc,char *argv[]) { glfuncs f; int i; SDL_Event event; int done=0; GLfloat pixels[NB_PIXELS*3]; #if defined(_WIN32) char *gl_library = "OpenGL32.DLL"; #elif defined(__QNXNTO__) char *gl_library = "libGL.so.3"; #else char *gl_library = "libGL.so.1"; #endif if (argv[1]) { gl_library = argv[1]; } if (SDL_Init(SDL_INIT_VIDEO)<0) { printf("Unable to init SDL : %s\n",SDL_GetError()); exit(1); } atexit(SDL_Quit); if (SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1)<0) { printf("Unable to set GL attribute : %s\n",SDL_GetError()); exit(1); } if (SDL_GL_LoadLibrary(gl_library)<0) { printf("Unable to dynamically open GL lib : %s\n",SDL_GetError()); exit(1); } if (SDL_SetVideoMode(640,480,0,SDL_OPENGL)==NULL) { printf("Unable to open video mode : %s\n",SDL_GetError()); exit(1); } /* Set the window manager title bar */ SDL_WM_SetCaption( "SDL Dynamic OpenGL Loading Test", "testdyngl" ); init_glfuncs(&f); for(i=0;i<NB_PIXELS;i++) { pixels[3*i]=rand()%250-125; pixels[3*i+1]=rand()%250-125; pixels[3*i+2]=rand()%250-125; } f.glViewport(0,0,640,480); f.glMatrixMode(GL_PROJECTION); f.glLoadIdentity(); f.glOrtho(-100,100,-100,100,-500,500); f.glMatrixMode(GL_MODELVIEW); f.glLoadIdentity(); f.glEnable(GL_DEPTH_TEST); f.glDisable(GL_TEXTURE_2D); f.glEnable(GL_BLEND); f.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); f.glClearColor(0.0f,0.0f,0.0f,0.0f); f.glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); f.glEnable(GL_POINT_SMOOTH); f.glHint(GL_POINT_SMOOTH_HINT,GL_NICEST); f.glPointSize(5.0f); f.glEnable(GL_FOG); f.glFogf(GL_FOG_START,-500); f.glFogf(GL_FOG_END,500); f.glFogf(GL_FOG_DENSITY,0.005); do { f.glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); f.glRotatef(2.0,1.0,1.0,1.0); f.glRotatef(1.0,0.0,1.0,1.0); f.glColor4ub(255,255,255,255); f.glBegin(GL_POINTS); for(i=0;i<NB_PIXELS;i++) { f.glVertex3f(pixels[3*i],pixels[3*i+1],pixels[3*i+2]); } f.glEnd(); SDL_GL_SwapBuffers(); while(SDL_PollEvent(&event)) { if(event.type & SDL_KEYDOWN) done=1; } SDL_Delay(20); } while(!done); SDL_Quit(); return 0; } #else /* HAVE_OPENGL */ int main(int argc, char *argv[]) { printf("No OpenGL support on this system\n"); return 1; } #endif /* HAVE_OPENGL */