Mercurial > sdl-ios-xcode
view test/testdyngl.c @ 3877:81f66f258d77 SDL-1.2
Fixed bug #281
------- Comment #2 From Christian Walther 2006-07-23 07:37 [reply] -------
Wow, that was an interesting bug to chase. It was a timing issue: it seems that
for some reason, a certain time must pass between ShowMenuBar() being called in
QZ_UnsetVideoMode() and the application quitting. Before rev. 1885, this delay
was provided by the slow hand-coded fade. With the asynchronous Core Graphics
fading introduced in rev. 1885, that delay was no longer present (most of the
time) and the bug became apparent. Adding an SDL_Delay(100) somewhere between
ShowMenuBar() and the end of QZ_VideoQuit() lowered the frequency of the bug
appearing from "almost every time" to "very rarely" here.
However, there is another solution: doing the ShowMenuBar() before releasing
the captured display instead of afterwards. Apparently, no delay is necessary
in that case, and it looks nicer to me anyway because it is the reverse order
of the way things are set up in the beginning: capture display - set video mode
- hide menu bar - ... - show menu bar - reset video mode - release captured
display. So, this is what the attached patch does.
In addition, I've taken the liberty of
- removing some unused code that I forgot to remove in rev. 1885,
- fixing two warnings about undeclared functions in SDL_QuartzVideo.m by
including OpenGL.h (whose name is a bit misleading - it only declares CGL
stuff, so there's no interference with SDL_opengl.h).
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 24 Sep 2006 01:27:40 +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 */