src/graphics/gropengl.cpp

   1 /*
   2  * Copyright (C) Volition, Inc. 1999.  All rights reserved.
   3  *
   4  * All source code herein is the property of Volition, Inc. You may not sell
   5  * or otherwise commercially exploit the source or things you created based on
   6  * the source.
   7  */
   8
   9 #include "pstypes.h"
  10 #include "osregistry.h"
  11 #include "gropengl.h"
  12 #include "grgl1.h"
  13 #include "gropenglinternal.h"
  14 #include "2d.h"
  15 #include "bmpman.h"
  16 #include "grinternal.h"
  17 #include "cmdline.h"
  18 #include "mouse.h"
  19 #include "osapi.h"
  20
  21
  22 bool OGL_inited = false;
  23 int GL_version = 0;
  24
  25 SDL_Window *GL_window = NULL;
  26 SDL_GLContext GL_context;
  27
  28 static int FSAA = 0;
  29
  30 int GL_viewport_x = 0;
  31 int GL_viewport_y = 0;
  32 int GL_viewport_w = 640;
  33 int GL_viewport_h = 480;
  34 float GL_viewport_scale_w = 1.0f;
  35 float GL_viewport_scale_h = 1.0f;
  36 int GL_min_texture_width = 0;
  37 int GL_max_texture_width = 0;
  38 int GL_min_texture_height = 0;
  39 int GL_max_texture_height = 0;
  40
  41 rb_t *render_buffer = NULL;
  42 static size_t render_buffer_size = 0;
  43
  44
  45 void opengl_alloc_render_buffer(unsigned int nelems)
  46 {
  47         if (nelems < 0) {
  48                 nelems = 1;
  49         }
  50
  51         if ( render_buffer && (nelems <= render_buffer_size) ) {
  52                 return;
  53         }
  54
  55         if (render_buffer) {
  56                 free(render_buffer);
  57         }
  58
  59         render_buffer = (rb_t*) malloc(sizeof(rb_t) * nelems);
  60         render_buffer_size = nelems;
  61 }
  62
  63 void opengl_free_render_buffer()
  64 {
  65         if (render_buffer) {
  66                 free(render_buffer);
  67                 render_buffer = NULL;
  68                 render_buffer_size = 0;
  69         }
  70 }
  71
  72 static void opengl_set_variables()
  73 {
  74         GL_min_texture_height = 16;
  75         GL_min_texture_width = 16;
  76
  77         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &GL_max_texture_width);
  78         GL_max_texture_height = GL_max_texture_width;
  79
  80         // no texture is larger than 1024, so maybe don't use sections
  81         if (GL_max_texture_width >= 1024) {
  82                 gr_screen.use_sections = 0;
  83         }
  84 }
  85
  86 static void opengl_init_viewport()
  87 {
  88         GL_viewport_x = 0;
  89         GL_viewport_y = 0;
  90         GL_viewport_w = gr_screen.max_w;
  91         GL_viewport_h = gr_screen.max_h;
  92         GL_viewport_scale_w = 1.0f;
  93         GL_viewport_scale_h = 1.0f;
  94
  95         glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
  96
  97         glMatrixMode(GL_PROJECTION);
  98         glLoadIdentity();
  99         glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
 100         glMatrixMode(GL_MODELVIEW);
 101         glLoadIdentity();
 102 }
 103
 104 void gr_opengl_force_windowed()
 105 {
 106         SDL_SetWindowFullscreen(GL_window, 0);
 107 }
 108
 109 void gr_opengl_force_fullscreen()
 110 {
 111         SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 112 }
 113
 114 void gr_opengl_toggle_fullscreen()
 115 {
 116         Uint32 flags = SDL_GetWindowFlags(GL_window);
 117
 118         if ( (flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP ) {
 119                 gr_opengl_force_windowed();
 120         } else {
 121                 gr_opengl_force_fullscreen();
 122         }
 123 }
 124
 125 void gr_opengl_cleanup()
 126 {
 127         opengl1_cleanup();
 128
 129         opengl_free_render_buffer();
 130 }
 131
 132 void gr_opengl_init()
 133 {
 134         if ( OGL_inited )       {
 135                 gr_opengl_cleanup();
 136                 OGL_inited = false;
 137         }
 138
 139         mprintf(( "Initializing OpenGL graphics device...\n" ));
 140
 141         OGL_inited = true;
 142
 143         if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
 144                 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
 145         }
 146
 147         int a = 1, r = 5, g = 5, b = 5, bpp = 16, db = 1;
 148
 149         SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
 150         SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
 151         SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
 152         SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
 153         SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
 154         SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, db);
 155
 156         FSAA = os_config_read_uint(NULL, "FSAA", 0);
 157
 158         if (FSAA) {
 159             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
 160             SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
 161         }
 162
 163         GL_window = SDL_CreateWindow(os_get_title(), SDL_WINDOWPOS_CENTERED,
 164                                                 SDL_WINDOWPOS_CENTERED,
 165                                                 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
 166
 167         if ( !GL_window ) {
 168                 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
 169         }
 170
 171         GL_context = SDL_GL_CreateContext(GL_window);
 172
 173         const char *gl_version = (const char*)glGetString(GL_VERSION);
 174         int v_major = 0, v_minor = 0;
 175
 176         sscanf(gl_version, "%d.%d", &v_major, &v_minor);
 177
 178         GL_version = (v_major * 10) + v_minor;
 179
 180         // version check, require 1.2+ for sake of simplicity
 181         if (GL_version < 12) {
 182                 Error(LOCATION, "Minimum OpenGL version is 1.2!");
 183         }
 184
 185         mprintf(("  Vendor   : %s\n", glGetString(GL_VENDOR)));
 186         mprintf(("  Renderer : %s\n", glGetString(GL_RENDERER)));
 187         mprintf(("  Version  : %s\n", gl_version));
 188
 189         mprintf(("  Attributes requested: ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 190
 191         SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
 192         SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
 193         SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
 194         SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
 195         SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
 196         SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &db);
 197         SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
 198
 199         mprintf(("  Attributes received : ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
 200
 201
 202         SDL_DisableScreenSaver();
 203         SDL_ShowCursor(0);
 204
 205         // initial viewport setup
 206         opengl_init_viewport();
 207
 208         // set up generic variables before further init() calls
 209         opengl_set_variables();
 210
 211         // main GL init
 212         opengl1_init();
 213
 214         // maybe go fullscreen - should be done *after* main GL init
 215         int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
 216         if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
 217                 SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
 218                 // poll for window events
 219                 os_poll();
 220         }
 221
 222         mprintf(("\n"));
 223
 224
 225         switch (bpp) {
 226                 case 15:
 227                 case 16:
 228                         gr_screen.bits_per_pixel = 16;
 229                         gr_screen.bytes_per_pixel = 2;
 230
 231                         // screen values
 232                         Gr_red.bits = 5;
 233                         Gr_red.shift = 10;
 234                         Gr_red.scale = 8;
 235                         Gr_red.mask = 0x7C00;
 236
 237                         Gr_green.bits = 5;
 238                         Gr_green.shift = 5;
 239                         Gr_green.scale = 8;
 240                         Gr_green.mask = 0x3E0;
 241
 242                         Gr_blue.bits = 5;
 243                         Gr_blue.shift = 0;
 244                         Gr_blue.scale = 8;
 245                         Gr_blue.mask = 0x1F;
 246
 247                         Gr_alpha.bits = 1;
 248                         Gr_alpha.shift = 15;
 249                         Gr_alpha.scale = 255;
 250                         Gr_alpha.mask = 0x8000;
 251
 252                         break;
 253
 254                 case 24:
 255                 case 32:
 256                         gr_screen.bits_per_pixel = 32;
 257                         gr_screen.bytes_per_pixel = 4;
 258
 259                         // screen values
 260                         Gr_red.bits = 8;
 261                         Gr_red.shift = 16;
 262                         Gr_red.scale = 1;
 263                         Gr_red.mask = 0xff0000;
 264
 265                         Gr_green.bits = 8;
 266                         Gr_green.shift = 8;
 267                         Gr_green.scale = 1;
 268                         Gr_green.mask = 0xff00;
 269
 270                         Gr_blue.bits = 8;
 271                         Gr_blue.shift = 0;
 272                         Gr_blue.scale = 1;
 273                         Gr_blue.mask = 0xff;
 274
 275                         Gr_alpha.bits = 8;
 276                         Gr_alpha.shift = 24;
 277                         Gr_alpha.scale = 1;
 278                         Gr_alpha.mask = 0xff000000;
 279
 280                         break;
 281
 282                 default:
 283                         Int3(); // Illegal bpp
 284                         break;
 285         }
 286
 287         // DDOI - set these so no one else does!
 288         // texture values, always 1555 - 16-bit
 289         Gr_t_red.mask = 0x7C00;
 290         Gr_t_red.shift = 10;
 291         Gr_t_red.scale = 8;
 292
 293         Gr_t_green.mask = 0x3E0;
 294         Gr_t_green.shift = 5;
 295         Gr_t_green.scale = 8;
 296
 297         Gr_t_blue.mask = 0x1F;
 298         Gr_t_blue.shift = 0;
 299         Gr_t_blue.scale = 8;
 300
 301         Gr_t_alpha.mask = 0x8000;
 302         Gr_t_alpha.scale = 255;
 303         Gr_t_alpha.shift = 15;
 304
 305         // alpha-texture values
 306         Gr_ta_red.mask = 0x0f00;
 307         Gr_ta_red.shift = 8;
 308         Gr_ta_red.scale = 16;
 309
 310         Gr_ta_green.mask = 0x00f0;
 311         Gr_ta_green.shift = 4;
 312         Gr_ta_green.scale = 16;
 313
 314         Gr_ta_blue.mask = 0x000f;
 315         Gr_ta_blue.shift = 0;
 316         Gr_ta_blue.scale = 16;
 317
 318         Gr_ta_alpha.mask = 0xf000;
 319         Gr_ta_alpha.shift = 12;
 320         Gr_ta_alpha.scale = 16;
 321
 322         // default to screen
 323         Gr_current_red = &Gr_red;
 324         Gr_current_blue = &Gr_blue;
 325         Gr_current_green = &Gr_green;
 326         Gr_current_alpha = &Gr_alpha;
 327
 328
 329         Mouse_hidden++;
 330         gr_reset_clip();
 331         gr_clear();
 332         gr_flip();
 333         gr_clear();
 334         Mouse_hidden--;
 335 }