2 * Copyright (C) Volition, Inc. 1999. All rights reserved.
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
10 #include "osregistry.h"
13 #include "gropenglinternal.h"
16 #include "grinternal.h"
22 bool OGL_inited = false;
25 SDL_Window *GL_window = NULL;
26 SDL_GLContext GL_context;
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;
41 rb_t *render_buffer = NULL;
42 static size_t render_buffer_size = 0;
45 void opengl_alloc_render_buffer(unsigned int nelems)
51 if ( render_buffer && (nelems <= render_buffer_size) ) {
59 render_buffer = (rb_t*) malloc(sizeof(rb_t) * nelems);
60 render_buffer_size = nelems;
63 void opengl_free_render_buffer()
68 render_buffer_size = 0;
72 static void opengl_set_variables()
74 GL_min_texture_height = 16;
75 GL_min_texture_width = 16;
77 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &GL_max_texture_width);
78 GL_max_texture_height = GL_max_texture_width;
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;
86 void gr_opengl_set_viewport(int width, int height)
90 float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
93 h = i2fl((width / ratio) + 0.5f);
97 w = i2fl((height * ratio) + 0.5f);
101 y = (height - h) / 2;
107 GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
108 GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
110 glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
112 glMatrixMode(GL_PROJECTION);
114 glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
115 glMatrixMode(GL_MODELVIEW);
117 glScalef(GL_viewport_scale_w, GL_viewport_scale_h, 1.0f);
120 void gr_opengl_force_windowed()
122 SDL_SetWindowFullscreen(GL_window, 0);
125 void gr_opengl_force_fullscreen()
127 SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
130 void gr_opengl_toggle_fullscreen()
132 Uint32 flags = SDL_GetWindowFlags(GL_window);
134 if ( (flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP ) {
135 gr_opengl_force_windowed();
137 gr_opengl_force_fullscreen();
141 void gr_opengl_set_color_fast(color *dst)
143 if ( dst->screen_sig != gr_screen.signature ) {
144 if ( dst->is_alphacolor ) {
145 gr_opengl_init_alphacolor( dst, dst->red, dst->green, dst->blue, dst->alpha, dst->ac_type );
147 gr_opengl_init_color( dst, dst->red, dst->green, dst->blue );
150 gr_screen.current_color = *dst;
153 void gr_opengl_get_color( int * r, int * g, int * b )
155 if (r) *r = gr_screen.current_color.red;
156 if (g) *g = gr_screen.current_color.green;
157 if (b) *b = gr_screen.current_color.blue;
160 void gr_opengl_init_color(color *c, int r, int g, int b)
162 c->screen_sig = gr_screen.signature;
163 c->red = (unsigned char)r;
164 c->green = (unsigned char)g;
165 c->blue = (unsigned char)b;
167 c->ac_type = AC_TYPE_NONE;
169 c->is_alphacolor = 0;
173 void gr_opengl_init_alphacolor( color *clr, int r, int g, int b, int alpha, int type )
175 if ( r < 0 ) r = 0; else if ( r > 255 ) r = 255;
176 if ( g < 0 ) g = 0; else if ( g > 255 ) g = 255;
177 if ( b < 0 ) b = 0; else if ( b > 255 ) b = 255;
178 if ( alpha < 0 ) alpha = 0; else if ( alpha > 255 ) alpha = 255;
180 gr_opengl_init_color( clr, r, g, b );
182 clr->alpha = (unsigned char)alpha;
183 clr->ac_type = (ubyte)type;
184 clr->alphacolor = -1;
185 clr->is_alphacolor = 1;
188 void gr_opengl_set_color( int r, int g, int b )
190 SDL_assert((r >= 0) && (r < 256));
191 SDL_assert((g >= 0) && (g < 256));
192 SDL_assert((b >= 0) && (b < 256));
194 gr_opengl_init_color( &gr_screen.current_color, r, g, b );
197 void gr_opengl_set_clear_color(int r, int g, int b)
199 gr_opengl_init_color(&gr_screen.current_clear_color, r, g, b);
202 void gr_opengl_set_bitmap(int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy)
204 gr_screen.current_alpha = alpha;
205 gr_screen.current_alphablend_mode = alphablend_mode;
206 gr_screen.current_bitblt_mode = bitblt_mode;
207 gr_screen.current_bitmap = bitmap_num;
209 gr_screen.current_bitmap_sx = sx;
210 gr_screen.current_bitmap_sy = sy;
213 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
215 shade->screen_sig = gr_screen.signature;
222 void gr_opengl_set_shader( shader * shade )
225 if (shade->screen_sig != gr_screen.signature) {
226 gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
228 gr_screen.current_shader = *shade;
230 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
234 int gr_opengl_zbuffer_get()
236 if ( !Gr_global_zbuffering ) {
237 return GR_ZBUFF_NONE;
240 return Gr_zbuffering_mode;
243 int gr_opengl_zbuffer_set(int mode)
245 int tmp = Gr_zbuffering_mode;
247 Gr_zbuffering_mode = mode;
249 if (Gr_zbuffering_mode == GR_ZBUFF_NONE) {
258 void gr_opengl_cleanup()
262 opengl_free_render_buffer();
265 void gr_opengl_init()
272 mprintf(( "Initializing OpenGL graphics device...\n" ));
276 if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
277 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
280 int a = 1, r = 5, g = 5, b = 5, bpp = 16, db = 1;
282 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
283 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
284 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
285 SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
286 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
287 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, db);
289 FSAA = os_config_read_uint(NULL, "FSAA", 0);
292 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
293 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
296 GL_window = SDL_CreateWindow(Osreg_title, SDL_WINDOWPOS_CENTERED,
297 SDL_WINDOWPOS_CENTERED,
298 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
301 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
304 GL_context = SDL_GL_CreateContext(GL_window);
306 const char *gl_version = (const char*)glGetString(GL_VERSION);
307 int v_major = 0, v_minor = 0;
309 sscanf(gl_version, "%d.%d", &v_major, &v_minor);
311 GL_version = (v_major * 10) + v_minor;
313 // version check, require 1.2+ for sake of simplicity
314 if (GL_version < 12) {
315 Error(LOCATION, "Minimum OpenGL version is 1.2!");
318 mprintf((" Vendor : %s\n", glGetString(GL_VENDOR)));
319 mprintf((" Renderer : %s\n", glGetString(GL_RENDERER)));
320 mprintf((" Version : %s\n", gl_version));
322 mprintf((" Attributes requested: ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
324 SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
325 SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
326 SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
327 SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
328 SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
329 SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &db);
330 SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
332 mprintf((" Attributes received : ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
335 SDL_DisableScreenSaver();
338 // initial viewport setup
339 gr_opengl_set_viewport(gr_screen.max_w, gr_screen.max_h);
341 // set up generic variables before further init() calls
342 opengl_set_variables();
347 // maybe go fullscreen - should be done *after* main GL init
348 int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
349 if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
350 SDL_SetWindowFullscreen(GL_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
351 // poll for window events
361 gr_screen.bits_per_pixel = 16;
362 gr_screen.bytes_per_pixel = 2;
368 Gr_red.mask = 0x7C00;
373 Gr_green.mask = 0x3E0;
382 Gr_alpha.scale = 255;
383 Gr_alpha.mask = 0x8000;
389 gr_screen.bits_per_pixel = 32;
390 gr_screen.bytes_per_pixel = 4;
396 Gr_red.mask = 0xff0000;
401 Gr_green.mask = 0xff00;
411 Gr_alpha.mask = 0xff000000;
416 Int3(); // Illegal bpp
420 // DDOI - set these so no one else does!
421 // texture values, always 1555 - 16-bit
422 Gr_t_red.mask = 0x7C00;
426 Gr_t_green.mask = 0x3E0;
427 Gr_t_green.shift = 5;
428 Gr_t_green.scale = 8;
430 Gr_t_blue.mask = 0x1F;
434 Gr_t_alpha.mask = 0x8000;
435 Gr_t_alpha.scale = 255;
436 Gr_t_alpha.shift = 15;
438 // alpha-texture values
439 Gr_ta_red.mask = 0x0f00;
441 Gr_ta_red.scale = 16;
443 Gr_ta_green.mask = 0x00f0;
444 Gr_ta_green.shift = 4;
445 Gr_ta_green.scale = 16;
447 Gr_ta_blue.mask = 0x000f;
448 Gr_ta_blue.shift = 0;
449 Gr_ta_blue.scale = 16;
451 Gr_ta_alpha.mask = 0xf000;
452 Gr_ta_alpha.shift = 12;
453 Gr_ta_alpha.scale = 16;
456 Gr_current_red = &Gr_red;
457 Gr_current_blue = &Gr_blue;
458 Gr_current_green = &Gr_green;
459 Gr_current_alpha = &Gr_alpha;