Mercurial > sdl-ios-xcode
view test/testdyngl.c @ 1879:cb232e63552c
Default the X11 dynamically loading on if the OS loader loads libraries
with their private symbols hidden. If that isn't the case, and someone
tries to enable it anyway, spit out a warning and don't let them do it.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 23 Jun 2006 08:39:05 +0000 |
parents | 871090feb7ad |
children | 782fd950bd46 c121d94672cb |
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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 __MACOS__ #define HAVE_OPENGL #endif #ifdef HAVE_OPENGL #include "SDL_opengl.h" /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ static void quit(int rc) { SDL_Quit(); exit(rc); } 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); quit(1); } return NULL; } 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]; const char *gl_library = NULL; /* Use the default GL library */ if (argv[1]) { gl_library = argv[1]; } if (SDL_Init(SDL_INIT_VIDEO)<0) { printf("Unable to init SDL : %s\n",SDL_GetError()); return(1); } if (SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1)<0) { printf("Unable to set GL attribute : %s\n",SDL_GetError()); quit(1); } if (SDL_GL_LoadLibrary(gl_library)<0) { printf("Unable to dynamically open GL lib : %s\n",SDL_GetError()); quit(1); } if (SDL_SetVideoMode(640,480,0,SDL_OPENGL)==NULL) { printf("Unable to open video mode : %s\n",SDL_GetError()); quit(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 */