SDL_x11gl.c
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:12k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: SDL_x11gl.c,v 1.4 2002/04/22 21:38:05 wmay Exp $";
- #endif
- #include <stdlib.h> /* For getenv() prototype */
- #include <string.h>
- #include "SDL_events_c.h"
- #include "SDL_error.h"
- #include "SDL_x11video.h"
- #include "SDL_x11dga_c.h"
- #include "SDL_x11gl_c.h"
- #define DEFAULT_OPENGL "libGL.so.1"
- /* return the preferred visual to use for openGL graphics */
- XVisualInfo *X11_GL_GetVisual(_THIS)
- {
- #ifdef HAVE_OPENGL
- /* 64 seems nice. */
- int attribs[64];
- int i;
- /* load the gl driver from a default path */
- if ( ! this->gl_config.driver_loaded ) {
- /* no driver has been loaded, use default (ourselves) */
- if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {
- return NULL;
- }
- }
- /* See if we already have a window which we must use */
- if ( SDL_windowid ) {
- XWindowAttributes a;
- XVisualInfo vi_in;
- int out_count;
- XGetWindowAttributes(SDL_Display, SDL_Window, &a);
- vi_in.screen = SDL_Screen;
- vi_in.visualid = XVisualIDFromVisual(a.visual);
- glx_visualinfo = XGetVisualInfo(SDL_Display,
- VisualScreenMask|VisualIDMask, &vi_in, &out_count);
- return glx_visualinfo;
- }
- /* Setup our GLX attributes according to the gl_config. */
- i = 0;
- attribs[i++] = GLX_RGBA;
- attribs[i++] = GLX_RED_SIZE;
- attribs[i++] = this->gl_config.red_size;
- attribs[i++] = GLX_GREEN_SIZE;
- attribs[i++] = this->gl_config.green_size;
- attribs[i++] = GLX_BLUE_SIZE;
- attribs[i++] = this->gl_config.blue_size;
- if( this->gl_config.alpha_size ) {
- attribs[i++] = GLX_ALPHA_SIZE;
- attribs[i++] = this->gl_config.alpha_size;
- }
- if( this->gl_config.buffer_size ) {
- attribs[i++] = GLX_BUFFER_SIZE;
- attribs[i++] = this->gl_config.buffer_size;
- }
- if( this->gl_config.double_buffer ) {
- attribs[i++] = GLX_DOUBLEBUFFER;
- }
- attribs[i++] = GLX_DEPTH_SIZE;
- attribs[i++] = this->gl_config.depth_size;
- if( this->gl_config.stencil_size ) {
- attribs[i++] = GLX_STENCIL_SIZE;
- attribs[i++] = this->gl_config.stencil_size;
- }
- if( this->gl_config.accum_red_size ) {
- attribs[i++] = GLX_ACCUM_RED_SIZE;
- attribs[i++] = this->gl_config.accum_red_size;
- }
- if( this->gl_config.accum_green_size ) {
- attribs[i++] = GLX_ACCUM_GREEN_SIZE;
- attribs[i++] = this->gl_config.accum_green_size;
- }
- if( this->gl_config.accum_blue_size ) {
- attribs[i++] = GLX_ACCUM_BLUE_SIZE;
- attribs[i++] = this->gl_config.accum_blue_size;
- }
- if( this->gl_config.accum_alpha_size ) {
- attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
- attribs[i++] = this->gl_config.accum_alpha_size;
- }
- #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
- attribs[i++] = GLX_X_VISUAL_TYPE;
- attribs[i++] = GLX_DIRECT_COLOR;
- #endif
- attribs[i++] = None;
- glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
- SDL_Screen, attribs);
- #ifdef GLX_DIRECT_COLOR
- if( !glx_visualinfo ) { /* No DirectColor visual? Try again.. */
- attribs[i-3] = None;
- glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
- SDL_Screen, attribs);
- }
- #endif
- if( !glx_visualinfo ) {
- SDL_SetError( "Couldn't find matching GLX visual");
- return NULL;
- }
- return glx_visualinfo;
- #else
- SDL_SetError("X11 driver not configured with OpenGL");
- return NULL;
- #endif
- }
- int X11_GL_CreateWindow(_THIS, int w, int h)
- {
- int retval;
- #ifdef HAVE_OPENGL
- XSetWindowAttributes attributes;
- unsigned long mask;
- unsigned long black;
- black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
- SDL_Screen))
- ? BlackPixel(SDL_Display, SDL_Screen) : 0;
- attributes.background_pixel = black;
- attributes.border_pixel = black;
- attributes.colormap = SDL_XColorMap;
- mask = CWBackPixel | CWBorderPixel | CWColormap;
- SDL_Window = XCreateWindow(SDL_Display, WMwindow,
- 0, 0, w, h, 0, glx_visualinfo->depth,
- InputOutput, glx_visualinfo->visual,
- mask, &attributes);
- if ( !SDL_Window ) {
- SDL_SetError("Could not create window");
- return -1;
- }
- retval = 0;
- #else
- SDL_SetError("X11 driver not configured with OpenGL");
- retval = -1;
- #endif
- return(retval);
- }
- int X11_GL_CreateContext(_THIS)
- {
- int retval;
- #ifdef HAVE_OPENGL
- /* We do this to create a clean separation between X and GLX errors. */
- XSync( SDL_Display, False );
- glx_context = this->gl_data->glXCreateContext(GFX_Display,
- glx_visualinfo, NULL, True);
- XSync( GFX_Display, False );
- if (glx_context == NULL) {
- SDL_SetError("Could not create GL context");
- return -1;
- }
- gl_active = 1;
- #else
- SDL_SetError("X11 driver not configured with OpenGL");
- #endif
- if ( gl_active ) {
- retval = 0;
- } else {
- retval = -1;
- }
- return(retval);
- }
- void X11_GL_Shutdown(_THIS)
- {
- #ifdef HAVE_OPENGL
- /* Clean up OpenGL */
- if( glx_context ) {
- this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
- if (glx_context != NULL)
- this->gl_data->glXDestroyContext(GFX_Display, glx_context);
- if( this->gl_data->glXReleaseBuffersMESA ) {
- this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window);
- }
- glx_context = NULL;
- }
- gl_active = 0;
- #endif /* HAVE_OPENGL */
- }
- #ifdef HAVE_OPENGL
- /* Make the current context active */
- int X11_GL_MakeCurrent(_THIS)
- {
- int retval;
- retval = 0;
- if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
- SDL_Window, glx_context) ) {
- SDL_SetError("Unable to make GL context current");
- retval = -1;
- }
- XSync( GFX_Display, False );
- /* More Voodoo X server workarounds... Grr... */
- SDL_Lock_EventThread();
- X11_CheckDGAMouse(this);
- SDL_Unlock_EventThread();
- return(retval);
- }
- /* Get attribute data from glX. */
- int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
- {
- int retval;
- int glx_attrib = None;
- switch( attrib ) {
- case SDL_GL_RED_SIZE:
- glx_attrib = GLX_RED_SIZE;
- break;
- case SDL_GL_GREEN_SIZE:
- glx_attrib = GLX_GREEN_SIZE;
- break;
- case SDL_GL_BLUE_SIZE:
- glx_attrib = GLX_BLUE_SIZE;
- break;
- case SDL_GL_ALPHA_SIZE:
- glx_attrib = GLX_ALPHA_SIZE;
- break;
- case SDL_GL_DOUBLEBUFFER:
- glx_attrib = GLX_DOUBLEBUFFER;
- break;
- case SDL_GL_BUFFER_SIZE:
- glx_attrib = GLX_BUFFER_SIZE;
- break;
- case SDL_GL_DEPTH_SIZE:
- glx_attrib = GLX_DEPTH_SIZE;
- break;
- case SDL_GL_STENCIL_SIZE:
- glx_attrib = GLX_STENCIL_SIZE;
- break;
- case SDL_GL_ACCUM_RED_SIZE:
- glx_attrib = GLX_ACCUM_RED_SIZE;
- break;
- case SDL_GL_ACCUM_GREEN_SIZE:
- glx_attrib = GLX_ACCUM_GREEN_SIZE;
- break;
- case SDL_GL_ACCUM_BLUE_SIZE:
- glx_attrib = GLX_ACCUM_BLUE_SIZE;
- break;
- case SDL_GL_ACCUM_ALPHA_SIZE:
- glx_attrib = GLX_ACCUM_ALPHA_SIZE;
- break;
- default:
- return(-1);
- }
- retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
- return retval;
- }
- void X11_GL_SwapBuffers(_THIS)
- {
- this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
- }
- #endif /* HAVE_OPENGL */
- void X11_GL_UnloadLibrary(_THIS)
- {
- #ifdef HAVE_OPENGL
- if ( this->gl_config.driver_loaded ) {
- dlclose(this->gl_config.dll_handle);
- this->gl_data->glXGetProcAddress = NULL;
- this->gl_data->glXChooseVisual = NULL;
- this->gl_data->glXCreateContext = NULL;
- this->gl_data->glXDestroyContext = NULL;
- this->gl_data->glXMakeCurrent = NULL;
- this->gl_data->glXSwapBuffers = NULL;
- this->gl_config.dll_handle = NULL;
- this->gl_config.driver_loaded = 0;
- }
- #endif
- }
- #ifdef HAVE_OPENGL
- /* Passing a NULL path means load pointers from the application */
- int X11_GL_LoadLibrary(_THIS, const char* path)
- {
- void* handle;
- int dlopen_flags;
- if ( gl_active ) {
- SDL_SetError("OpenGL context already created");
- return -1;
- }
- #ifdef RTLD_GLOBAL
- dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
- #else
- dlopen_flags = RTLD_LAZY;
- #endif
- handle = dlopen(path, dlopen_flags);
- /* Catch the case where the application isn't linked with GL */
- if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) {
- dlclose(handle);
- path = getenv("SDL_VIDEO_GL_DRIVER");
- if ( path == NULL ) {
- path = DEFAULT_OPENGL;
- }
- handle = dlopen(path, dlopen_flags);
- }
- if ( handle == NULL ) {
- SDL_SetError("Could not load OpenGL library");
- return -1;
- }
- /* Unload the old driver and reset the pointers */
- X11_GL_UnloadLibrary(this);
- /* Load new function pointers */
- this->gl_data->glXGetProcAddress =
- (void *(*)(const GLubyte *)) dlsym(handle, "glXGetProcAddressARB");
- this->gl_data->glXChooseVisual =
- (XVisualInfo *(*)(Display *, int, int *)) dlsym(handle, "glXChooseVisual");
- this->gl_data->glXCreateContext =
- (GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) dlsym(handle, "glXCreateContext");
- this->gl_data->glXDestroyContext =
- (void (*)(Display *, GLXContext)) dlsym(handle, "glXDestroyContext");
- this->gl_data->glXMakeCurrent =
- (int (*)(Display *, GLXDrawable, GLXContext)) dlsym(handle, "glXMakeCurrent");
- this->gl_data->glXSwapBuffers =
- (void (*)(Display *, GLXDrawable)) dlsym(handle, "glXSwapBuffers");
- this->gl_data->glXGetConfig =
- (int (*)(Display *, XVisualInfo *, int, int *)) dlsym(handle, "glXGetConfig");
- /* We don't compare below for this in case we're not using Mesa. */
- this->gl_data->glXReleaseBuffersMESA =
- (void (*)(Display *, GLXDrawable)) dlsym( handle, "glXReleaseBuffersMESA" );
- if ( (this->gl_data->glXChooseVisual == NULL) ||
- (this->gl_data->glXCreateContext == NULL) ||
- (this->gl_data->glXDestroyContext == NULL) ||
- (this->gl_data->glXMakeCurrent == NULL) ||
- (this->gl_data->glXSwapBuffers == NULL) ||
- (this->gl_data->glXGetConfig == NULL) ) {
- SDL_SetError("Could not retrieve OpenGL functions");
- return -1;
- }
- this->gl_config.dll_handle = handle;
- this->gl_config.driver_loaded = 1;
- if ( path ) {
- strncpy(this->gl_config.driver_path, path,
- sizeof(this->gl_config.driver_path)-1);
- } else {
- strcpy(this->gl_config.driver_path, "");
- }
- return 0;
- }
- void *X11_GL_GetProcAddress(_THIS, const char* proc)
- {
- static char procname[1024];
- void* handle;
- void* retval;
- handle = this->gl_config.dll_handle;
- #if 0 /* This doesn't work correctly yet */
- if ( this->gl_data->glXGetProcAddress ) {
- void *func, *func2;
- func = this->gl_data->glXGetProcAddress(proc);
- func2 = dlsym(handle, proc);
- if ( func != func2 ) {
- fprintf(stderr, "glXGetProcAddress returned %p and dlsym returned %p for %sn", func, func2, proc);
- }
- return this->gl_data->glXGetProcAddress(proc);
- }
- #endif
- #if defined(__OpenBSD__) && !defined(__ELF__)
- #undef dlsym(x,y);
- #endif
- retval = dlsym(handle, proc);
- if (!retval && strlen(proc) <= 1022) {
- procname[0] = '_';
- strcpy(procname + 1, proc);
- retval = dlsym(handle, procname);
- }
- return retval;
- }
- #endif /* HAVE_OPENGL */