arch/ogl/sdlgl.c

   1 /* $Id: sdlgl.c,v 1.11 2004-05-20 02:04:28 btb Exp $ */
   2 /*
   3  *
   4  * Graphics functions for SDL-GL.
   5  *
   6  *
   7  */
   8
   9 #ifdef HAVE_CONFIG_H
  10 #include <conf.h>
  11 #endif
  12
  13 #include <SDL.h>
  14 #ifdef SDL_IMAGE
  15 #include <SDL_image.h>
  16 #endif
  17
  18 #include "internal.h"
  19 #include "vers_id.h"
  20 #include "error.h"
  21 #include "u_mem.h"
  22 #include "args.h"
  23
  24 static int curx=-1,cury=-1,curfull=0;
  25
  26 void ogl_do_fullscreen_internal(void){
  27         ogl_init_window(curx,cury);
  28 }
  29
  30 static Uint16 gammaramp[512];
  31
  32 static void init_gammaramp(void)
  33 {
  34         int i;
  35
  36         for (i = 0; i < 256; ++i)
  37                 gammaramp[i] = i * 256;
  38         for (i = 256; i < 512; ++i)
  39                 gammaramp[i] = 0xffff;
  40 }
  41
  42 int ogl_setbrightness_internal(void)
  43 {
  44         return SDL_SetGammaRamp(gammaramp + ogl_brightness_r * 4,
  45                                 gammaramp + ogl_brightness_g * 4,
  46                                 gammaramp + ogl_brightness_b * 4
  47                                                         );
  48 }
  49
  50 // maybe we might add a real gamma setting (as opposed to brightness setting)
  51 // however, SDL_SetGamma seems to call SetGammaRamp internally, so we would need
  52 // to modify our own gamma ramp instead.
  53 //int ogl_setgamma_internal(void)
  54 //{
  55 //      float gamma = 1 + gr_palette_realgamma / 8.0;
  56 //      return SDL_SetGamma(gamma, gamma, gamma);
  57 //}
  58
  59 void ogl_swap_buffers_internal(void)
  60 {
  61         SDL_GL_SwapBuffers();
  62 }
  63
  64
  65 int ogl_check_mode(int x, int y)
  66 {
  67         return !SDL_VideoModeOK(x, y, 16, SDL_OPENGL | (ogl_fullscreen?SDL_FULLSCREEN:0));
  68 }
  69
  70
  71 int ogl_init_window(int x, int y){
  72         if (gl_initialized){
  73                 if (x==curx && y==cury && curfull==ogl_fullscreen)
  74                         return 0;
  75 #ifdef __linux__ // Windows, at least, seems to need to reload every time.
  76                 if (ogl_fullscreen || curfull)
  77 #endif
  78                         ogl_smash_texture_list_internal();//if we are or were fullscreen, changing vid mode will invalidate current textures
  79         }
  80         SDL_WM_SetCaption(DESCENT_VERSION, "Descent II");
  81
  82 #ifdef SDL_IMAGE
  83         {
  84 #include "descent.xpm"
  85                 SDL_WM_SetIcon(IMG_ReadXPMFromArray(pixmap), NULL);
  86         }
  87 #endif
  88
  89         if (!SDL_SetVideoMode(x,y, 16, SDL_OPENGL | (ogl_fullscreen?SDL_FULLSCREEN:0))) {
  90            Error("Could not set %dx%dx16 opengl video mode\n",x,y);
  91         }
  92         SDL_ShowCursor(0);
  93
  94         curx=x;cury=y;curfull=ogl_fullscreen;
  95         gl_initialized=1;
  96
  97         return 0;
  98 }
  99
 100 void ogl_destroy_window(void){
 101         if (gl_initialized){
 102                 ogl_smash_texture_list_internal();
 103                 SDL_ShowCursor(1);
 104                 //gl_initialized=0;
 105                 //well..SDL doesn't really let you kill the window.. so we just need to wait for sdl_quit
 106         }
 107         return;
 108 }
 109
 110 void ogl_init(void){
 111         int t;
 112         if ((t=FindArg("-gl_red")))
 113                 SDL_GL_SetAttribute( SDL_GL_RED_SIZE, atoi(Args[t+1]) );
 114         if ((t=FindArg("-gl_green")))
 115                 SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, atoi(Args[t+1]) );
 116         if ((t=FindArg("-gl_blue")))
 117                 SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, atoi(Args[t+1]) );
 118         if ((t=FindArg("-gl_alpha")))
 119                 SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, atoi(Args[t+1]) );
 120         if ((t=FindArg("-gl_buffer")))
 121                 SDL_GL_SetAttribute( SDL_GL_BUFFER_SIZE, atoi(Args[t+1]) );
 122 //      SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
 123 //      SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
 124 //      SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
 125 //      SDL_GL_SetAttribute( SDL_GL_ALPHA_SIZE, 8 );
 126
 127
 128         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,0);
 129         SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE,0);
 130         SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE,0);
 131         SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE,0);
 132         SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE,0);
 133         SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE,0);
 134         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1);
 135
 136         init_gammaramp();
 137 }
 138
 139 void ogl_close(void){
 140 #if 0  // shouldn't really be necessary...
 141         if (ogl_fullscreen){
 142                 ogl_fullscreen=0;
 143                 ogl_do_fullscreen_internal();
 144         }
 145 #endif
 146         ogl_destroy_window();
 147 }