quakeforge/libs/video/targets/vid_sdl_gl.c

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/*
vid_sdl.c
Video driver for Sam Lantinga's Simple DirectMedia Layer
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>
#include <SDL.h>
#include "QF/console.h"
#include "QF/cvar.h"
#include "QF/qendian.h"
#include "QF/sys.h"
#include "QF/vid.h"
#include "context_sdl.h"
#include "d_iface.h"
#include "vid_internal.h"
#include "vid_gl.h"
// Define GLAPIENTRY to a useful value
#ifndef GLAPIENTRY
# ifdef _WIN32
# include <windows.h>
# define GLAPIENTRY WINAPI
# undef LoadImage
# else
# ifdef APIENTRY
# define GLAPIENTRY APIENTRY
# else
# define GLAPIENTRY
# endif
# endif
#endif
static void (GLAPIENTRY *qfglFinish) (void);
static int use_gl_procaddress = 0;
static cvar_t *gl_driver;
static void *
QFGL_ProcAddress (const char *name, qboolean crit)
{
void *glfunc = NULL;
Sys_MaskPrintf (SYS_VID, "DEBUG: Finding symbol %s ... ", name);
glfunc = SDL_GL_GetProcAddress (name);
if (glfunc) {
Sys_MaskPrintf (SYS_VID, "found [%p]\n", glfunc);
return glfunc;
}
Sys_MaskPrintf (SYS_VID, "not found\n");
if (crit) {
if (strncmp ("fxMesa", name, 6) == 0) {
Sys_Printf ("This target requires a special version of Mesa with "
"support for Glide and SVGAlib.\n");
Sys_Printf ("If you are in X, try using a GLX or SGL target.\n");
}
Sys_Error ("Couldn't load critical OpenGL function %s, exiting...",
name);
}
return NULL;
}
static void
sdlgl_set_vid_mode (gl_ctx_t *ctx)
{
int i, j;
sdl_flags |= SDL_OPENGL;
// Setup GL Attributes
SDL_GL_SetAttribute (SDL_GL_DOUBLEBUFFER, 1);
// SDL_GL_SetAttribute (SDL_GL_STENCIL_SIZE, 0); // Try for 0, 8
// SDL_GL_SetAttribute (SDL_GL_STEREO, 1); // Someday...
for (i = 0; i < 5; i++) {
int k;
int color[5] = {32, 24, 16, 15, 0};
int rgba[5][4] = {
{8, 8, 8, 0},
{8, 8, 8, 8},
{5, 6, 5, 0},
{5, 5, 5, 0},
{5, 5, 5, 1},
};
SDL_GL_SetAttribute (SDL_GL_RED_SIZE, rgba[i][0]);
SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, rgba[i][1]);
SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, rgba[i][2]);
SDL_GL_SetAttribute (SDL_GL_ALPHA_SIZE, rgba[i][3]);
for (j = 0; j < 5; j++) {
for (k = 32; k >= 16; k -= 8) {
SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, k);
if ((sdl_screen = SDL_SetVideoMode (viddef.width, viddef.height,
color[j], sdl_flags)))
goto success;
}
}
}
Sys_Error ("Couldn't set video mode: %s", SDL_GetError ());
SDL_Quit ();
success:
viddef.numpages = 2;
ctx->init_gl ();
}
static void
sdlgl_end_rendering (void)
{
qfglFinish ();
SDL_GL_SwapBuffers ();
}
static void
sdl_load_gl (void)
{
if (SDL_GL_LoadLibrary (gl_driver->string) != 0)
Sys_Error ("Couldn't load OpenGL library %s!", gl_driver->string);
use_gl_procaddress = 1;
qfglFinish = QFGL_ProcAddress ("glFinish", true);
}
gl_ctx_t *
SDL_GL_Context (void)
{
gl_ctx_t *ctx = calloc (1, sizeof (gl_ctx_t));
ctx->load_gl = sdl_load_gl;
ctx->create_context = sdlgl_set_vid_mode;
ctx->get_proc_address = QFGL_ProcAddress;
ctx->end_rendering = sdlgl_end_rendering;
return ctx;
}
void
SDL_GL_Init_Cvars ()
{
gl_driver = Cvar_Get ("gl_driver", GL_DRIVER, CVAR_ROM, NULL,
"The OpenGL library to use. (path optional)");
}