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"
12 #include "gropengl1.h"
13 #include "gropenglinternal.h"
16 #include "grinternal.h"
21 bool OGL_inited = false;
24 SDL_Window *GL_window = NULL;
25 SDL_GLContext GL_context;
29 int GL_viewport_x = 0;
30 int GL_viewport_y = 0;
31 int GL_viewport_w = 640;
32 int GL_viewport_h = 480;
33 float GL_viewport_scale_w = 1.0f;
34 float GL_viewport_scale_h = 1.0f;
35 int GL_min_texture_width = 0;
36 int GL_max_texture_width = 0;
37 int GL_min_texture_height = 0;
38 int GL_max_texture_height = 0;
40 rb_t *render_buffer = NULL;
41 static size_t render_buffer_size = 0;
44 void opengl_alloc_render_buffer(unsigned int nelems)
50 if ( render_buffer && (nelems <= render_buffer_size) ) {
58 render_buffer = (rb_t*) malloc(sizeof(rb_t) * nelems);
59 render_buffer_size = nelems;
62 void opengl_free_render_buffer()
67 render_buffer_size = 0;
71 static void opengl_set_variables()
73 GL_min_texture_height = 16;
74 GL_min_texture_width = 16;
76 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &GL_max_texture_width);
77 GL_max_texture_height = GL_max_texture_width;
79 // no texture is larger than 1024, so maybe don't use sections
80 if (GL_max_texture_width >= 1024) {
81 gr_screen.use_sections = 0;
85 void gr_opengl_set_viewport(int width, int height)
89 float ratio = gr_screen.max_w / i2fl(gr_screen.max_h);
92 h = i2fl((width / ratio) + 0.5f);
96 w = i2fl((height * ratio) + 0.5f);
100 y = (height - h) / 2;
106 GL_viewport_scale_w = w / i2fl(gr_screen.max_w);
107 GL_viewport_scale_h = h / i2fl(gr_screen.max_h);
109 glViewport(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h);
111 glMatrixMode(GL_PROJECTION);
113 glOrtho(0, GL_viewport_w, GL_viewport_h, 0, 0.0, 1.0);
114 glMatrixMode(GL_MODELVIEW);
116 glScalef(GL_viewport_scale_w, GL_viewport_scale_h, 1.0f);
119 void gr_opengl_force_windowed()
121 SDL_SetWindowFullscreen(GL_window, 0);
124 void gr_opengl_force_fullscreen()
126 int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
127 int flag = SDL_WINDOW_FULLSCREEN_DESKTOP;
129 if (fullscreen == 2) {
130 flag = SDL_WINDOW_FULLSCREEN;
133 SDL_SetWindowFullscreen(GL_window, flag);
136 void gr_opengl_set_color_fast(color *dst)
138 if ( dst->screen_sig != gr_screen.signature ) {
139 if ( dst->is_alphacolor ) {
140 gr_opengl_init_alphacolor( dst, dst->red, dst->green, dst->blue, dst->alpha, dst->ac_type );
142 gr_opengl_init_color( dst, dst->red, dst->green, dst->blue );
145 gr_screen.current_color = *dst;
148 void gr_opengl_get_color( int * r, int * g, int * b )
150 if (r) *r = gr_screen.current_color.red;
151 if (g) *g = gr_screen.current_color.green;
152 if (b) *b = gr_screen.current_color.blue;
155 void gr_opengl_init_color(color *c, int r, int g, int b)
157 c->screen_sig = gr_screen.signature;
158 c->red = (unsigned char)r;
159 c->green = (unsigned char)g;
160 c->blue = (unsigned char)b;
162 c->ac_type = AC_TYPE_NONE;
164 c->is_alphacolor = 0;
168 void gr_opengl_init_alphacolor( color *clr, int r, int g, int b, int alpha, int type )
170 if ( r < 0 ) r = 0; else if ( r > 255 ) r = 255;
171 if ( g < 0 ) g = 0; else if ( g > 255 ) g = 255;
172 if ( b < 0 ) b = 0; else if ( b > 255 ) b = 255;
173 if ( alpha < 0 ) alpha = 0; else if ( alpha > 255 ) alpha = 255;
175 gr_opengl_init_color( clr, r, g, b );
177 clr->alpha = (unsigned char)alpha;
178 clr->ac_type = (ubyte)type;
179 clr->alphacolor = -1;
180 clr->is_alphacolor = 1;
183 void gr_opengl_set_color( int r, int g, int b )
185 SDL_assert((r >= 0) && (r < 256));
186 SDL_assert((g >= 0) && (g < 256));
187 SDL_assert((b >= 0) && (b < 256));
189 gr_opengl_init_color( &gr_screen.current_color, r, g, b );
192 void gr_opengl_set_clear_color(int r, int g, int b)
194 gr_opengl_init_color(&gr_screen.current_clear_color, r, g, b);
197 void gr_opengl_set_bitmap(int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy)
199 gr_screen.current_alpha = alpha;
200 gr_screen.current_alphablend_mode = alphablend_mode;
201 gr_screen.current_bitblt_mode = bitblt_mode;
202 gr_screen.current_bitmap = bitmap_num;
204 gr_screen.current_bitmap_sx = sx;
205 gr_screen.current_bitmap_sy = sy;
208 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
210 shade->screen_sig = gr_screen.signature;
217 void gr_opengl_set_shader( shader * shade )
220 if (shade->screen_sig != gr_screen.signature) {
221 gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
223 gr_screen.current_shader = *shade;
225 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
229 int gr_opengl_zbuffer_get()
231 if ( !Gr_global_zbuffering ) {
232 return GR_ZBUFF_NONE;
235 return Gr_zbuffering_mode;
238 int gr_opengl_zbuffer_set(int mode)
240 int tmp = Gr_zbuffering_mode;
242 Gr_zbuffering_mode = mode;
244 if (Gr_zbuffering_mode == GR_ZBUFF_NONE) {
253 void gr_opengl_cleanup()
257 opengl_free_render_buffer();
260 void gr_opengl_init()
267 mprintf(( "Initializing OpenGL graphics device...\n" ));
271 if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
272 Error(LOCATION, "Couldn't init SDL: %s", SDL_GetError());
275 int a = 1, r = 5, g = 5, b = 5, bpp = 16, db = 1;
277 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, r);
278 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, g);
279 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, b);
280 SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, a);
281 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, bpp);
282 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, db);
284 FSAA = os_config_read_uint(NULL, "FSAA", 2);
287 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
288 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, FSAA);
291 GL_window = SDL_CreateWindow(Osreg_title, SDL_WINDOWPOS_CENTERED,
292 SDL_WINDOWPOS_CENTERED,
293 gr_screen.max_w, gr_screen.max_h, SDL_WINDOW_OPENGL);
296 Error(LOCATION, "Couldn't create window: %s\n", SDL_GetError());
299 GL_context = SDL_GL_CreateContext(GL_window);
301 const char *gl_version = (const char*)glGetString(GL_VERSION);
302 int v_major = 0, v_minor = 0;
304 sscanf(gl_version, "%d.%d", &v_major, &v_minor);
306 GL_version = (v_major * 10) + v_minor;
308 // version check, require 1.2+ for sake of simplicity
309 if (GL_version < 12) {
310 Error(LOCATION, "Minimum OpenGL version is 1.2!");
313 mprintf((" Vendor : %s\n", glGetString(GL_VENDOR)));
314 mprintf((" Renderer : %s\n", glGetString(GL_RENDERER)));
315 mprintf((" Version : %s\n", gl_version));
317 mprintf((" Attributes requested: ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
319 SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &r);
320 SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &g);
321 SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &b);
322 SDL_GL_GetAttribute(SDL_GL_ALPHA_SIZE, &a);
323 SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &bpp);
324 SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &db);
325 SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &FSAA);
327 mprintf((" Attributes received : ARGB %d%d%d%d, BPP %d, DB %d, AA %d\n", a, r, g, b, bpp, db, FSAA));
332 // initial setup viewport
333 gr_opengl_set_viewport(gr_screen.max_w, gr_screen.max_h);
335 // maybe go fullscreen - should be done *after* initial viewport setup
336 int fullscreen = os_config_read_uint(NULL, "Fullscreen", 1);
337 if ( !Cmdline_window && (fullscreen || Cmdline_fullscreen) ) {
338 int flag = SDL_WINDOW_FULLSCREEN_DESKTOP;
340 if (fullscreen == 2) {
341 flag = SDL_WINDOW_FULLSCREEN;
344 SDL_SetWindowFullscreen(GL_window, flag);
347 // set up generic variables before further init() calls
348 opengl_set_variables();
355 extern int D3D_enabled;
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;