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Aminet 44 (2001)(GTI - Schatztruhe)[!][Aug 2001].iso
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AmigaSDLsrc.lha
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SDL_cgxgl.c
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2000-08-11
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000 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@devolution.com
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id: SDL_x11gl.c,v 1.1.2.20 2000/07/27 04:37:51 hercules Exp $";
#endif
// #include <stdlib.h> /* For getenv() prototype */
// #include <string.h>
#include "SDL_events_c.h"
#include "SDL_error.h"
#include "SDL_cgxvideo.h"
#include "SDL_cgxgl_c.h"
#define DEFAULT_OPENGL "libGL.so.1"
/* return the preferred visual to use for openGL graphics */
void *CGX_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;
}
attribs[i++] = None;
glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
SDL_Screen, attribs);
if( !glx_visualinfo ) {
SDL_SetError( "Couldn't find matching GLX visual");
return NULL;
}
return glx_visualinfo;
#else
SDL_SetError("CGX driver is not yet supporting OpenGL");
return NULL;
#endif
}
int CGX_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("CGX driver is not yet supporting OpenGL");
retval = -1;
#endif
return(retval);
}
int CGX_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("CGX driver is not yet supporting OpenGL");
#endif
if ( gl_active ) {
retval = 0;
} else {
retval = -1;
}
return(retval);
}
void CGX_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 CGX_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 CGX_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 CGX_GL_SwapBuffers(_THIS)
{
this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
}
#endif /* HAVE_OPENGL */
void CGX_GL_UnloadLibrary(_THIS)
{
#ifdef HAVE_OPENGL
if ( this->gl_config.driver_loaded ) {
dlclose(this->gl_config.dll_handle);
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 CGX_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->glXChooseVisual = dlsym(handle, "glXChooseVisual");
this->gl_data->glXCreateContext = dlsym(handle, "glXCreateContext");
this->gl_data->glXDestroyContext = dlsym(handle, "glXDestroyContext");
this->gl_data->glXMakeCurrent = dlsym(handle, "glXMakeCurrent");
this->gl_data->glXSwapBuffers = dlsym(handle, "glXSwapBuffers");
this->gl_data->glXGetConfig = dlsym(handle, "glXGetConfig");
/* We don't compare below for this in case we're not using Mesa. */
this->gl_data->glXReleaseBuffersMESA = 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 *CGX_GL_GetProcAddress(_THIS, const char* proc)
{
void* handle;
handle = this->gl_config.dll_handle;
return dlsym(handle, proc);
}
#endif /* HAVE_OPENGL */