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 "gropengl1.h"
11 #include "gropenglinternal.h"
17 #include "grinternal.h"
22 static int GL_one_inited = 0;
25 volatile int GL_activate = 0;
26 volatile int GL_deactivate = 0;
28 static GLuint Gr_saved_screen_tex = 0;
30 static int Gr_opengl_mouse_saved = 0;
31 static int Gr_opengl_mouse_saved_x = 0;
32 static int Gr_opengl_mouse_saved_y = 0;
33 static int Gr_opengl_mouse_saved_w = 0;
34 static int Gr_opengl_mouse_saved_h = 0;
35 static ubyte *Gr_opengl_mouse_saved_data = NULL;
38 PFNGLSECONDARYCOLORPOINTERPROC vglSecondaryColorPointer = NULL;
41 static gr_alpha_blend GL_current_alpha_blend = (gr_alpha_blend) -1;
42 static gr_zbuffer_type GL_current_zbuffer_type = (gr_zbuffer_type) -1;
44 void opengl1_set_state(gr_texture_source ts, gr_alpha_blend ab, gr_zbuffer_type zt)
46 opengl1_set_texture_state(ts);
48 if (ab != GL_current_alpha_blend) {
50 case ALPHA_BLEND_NONE: // 1*SrcPixel + 0*DestPixel
51 glBlendFunc(GL_ONE, GL_ZERO);
53 case ALPHA_BLEND_ADDITIVE: // 1*SrcPixel + 1*DestPixel
54 glBlendFunc(GL_ONE, GL_ONE);
56 case ALPHA_BLEND_ALPHA_ADDITIVE: // Alpha*SrcPixel + 1*DestPixel
57 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
59 case ALPHA_BLEND_ALPHA_BLEND_ALPHA: // Alpha*SrcPixel + (1-Alpha)*DestPixel
60 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
62 case ALPHA_BLEND_ALPHA_BLEND_SRC_COLOR: // Alpha*SrcPixel + (1-SrcPixel)*DestPixel
63 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_COLOR);
69 GL_current_alpha_blend = ab;
72 if (zt != GL_current_zbuffer_type) {
74 case ZBUFFER_TYPE_NONE:
75 glDepthFunc(GL_ALWAYS);
76 glDepthMask(GL_FALSE);
78 case ZBUFFER_TYPE_READ:
80 glDepthMask(GL_FALSE);
82 case ZBUFFER_TYPE_WRITE:
83 glDepthFunc(GL_ALWAYS);
86 case ZBUFFER_TYPE_FULL:
94 GL_current_zbuffer_type = zt;
98 void opengl1_cleanup()
100 if ( !GL_one_inited ) {
104 gr_opengl1_reset_clip();
108 opengl1_tcache_cleanup();
113 static void opengl1_init_func_pointers()
115 gr_screen.gf_flip = gr_opengl1_flip;
116 gr_screen.gf_set_clip = gr_opengl1_set_clip;
117 gr_screen.gf_reset_clip = gr_opengl1_reset_clip;
119 gr_screen.gf_set_color = gr_opengl_set_color;
120 gr_screen.gf_set_bitmap = gr_opengl_set_bitmap;
121 gr_screen.gf_create_shader = gr_opengl_create_shader;
122 gr_screen.gf_set_shader = gr_opengl_set_shader;
123 gr_screen.gf_clear = gr_opengl1_clear;
125 gr_screen.gf_aabitmap = gr_opengl1_aabitmap;
126 gr_screen.gf_aabitmap_ex = gr_opengl1_aabitmap_ex;
128 gr_screen.gf_rect = gr_opengl1_rect;
129 gr_screen.gf_shade = gr_opengl1_shade;
130 gr_screen.gf_string = gr_opengl1_string;
131 gr_screen.gf_circle = gr_opengl1_circle;
133 gr_screen.gf_line = gr_opengl1_line;
134 gr_screen.gf_aaline = gr_opengl1_aaline;
135 gr_screen.gf_pixel = gr_opengl1_pixel;
136 gr_screen.gf_scaler = gr_opengl1_scaler;
137 gr_screen.gf_tmapper = gr_opengl1_tmapper;
139 gr_screen.gf_gradient = gr_opengl1_gradient;
141 gr_screen.gf_get_color = gr_opengl_get_color;
142 gr_screen.gf_init_color = gr_opengl_init_color;
143 gr_screen.gf_init_alphacolor = gr_opengl_init_alphacolor;
144 gr_screen.gf_set_color_fast = gr_opengl_set_color_fast;
145 gr_screen.gf_print_screen = gr_opengl1_print_screen;
147 gr_screen.gf_fade_in = gr_opengl1_fade_in;
148 gr_screen.gf_fade_out = gr_opengl1_fade_out;
149 gr_screen.gf_flash = gr_opengl1_flash;
151 gr_screen.gf_zbuffer_get = gr_opengl_zbuffer_get;
152 gr_screen.gf_zbuffer_set = gr_opengl_zbuffer_set;
153 gr_screen.gf_zbuffer_clear = gr_opengl1_zbuffer_clear;
155 gr_screen.gf_save_screen = gr_opengl1_save_screen;
156 gr_screen.gf_restore_screen = gr_opengl1_restore_screen;
157 gr_screen.gf_free_screen = gr_opengl1_free_screen;
159 gr_screen.gf_dump_frame_start = gr_opengl1_dump_frame_start;
160 gr_screen.gf_dump_frame_stop = gr_opengl1_dump_frame_stop;
161 gr_screen.gf_dump_frame = gr_opengl1_dump_frame;
163 gr_screen.gf_set_gamma = gr_opengl1_set_gamma;
165 gr_screen.gf_lock = gr_opengl1_lock;
166 gr_screen.gf_unlock = gr_opengl1_unlock;
168 gr_screen.gf_fog_set = gr_opengl1_fog_set;
170 gr_screen.gf_get_region = gr_opengl1_get_region;
172 gr_screen.gf_set_cull = gr_opengl1_set_cull;
174 gr_screen.gf_cross_fade = gr_opengl1_cross_fade;
176 gr_screen.gf_set_clear_color = gr_opengl_set_clear_color;
178 gr_screen.gf_preload_init = gr_opengl1_preload_init;
179 gr_screen.gf_preload = gr_opengl1_preload;
181 gr_screen.gf_zbias = gr_opengl1_zbias;
183 gr_screen.gf_force_windowed = gr_opengl_force_windowed;
184 gr_screen.gf_force_fullscreen = gr_opengl_force_fullscreen;
185 gr_screen.gf_toggle_fullscreen = gr_opengl_toggle_fullscreen;
187 gr_screen.gf_set_viewport = gr_opengl_set_viewport;
189 gr_screen.gf_activate = gr_opengl1_activate;
199 1 = use secondary color ext
200 2 = use opengl linear fog
204 // only available with OpenGL 1.2+, must get ptr for Windows
205 vglSecondaryColorPointer = (PFNGLSECONDARYCOLORPOINTERPROC)SDL_GL_GetProcAddress("glSecondaryColorPointer");
207 if (vglSecondaryColorPointer) {
211 mprintf((" Fog mode: %s\n", (OGL_fog_mode == 1) ? "secondary color" : "linear"));
213 glShadeModel(GL_SMOOTH);
215 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
216 glHint(GL_FOG_HINT, GL_NICEST);
218 glEnable(GL_DEPTH_TEST);
221 glEnable(GL_TEXTURE_2D);
223 glDepthRange(0.0, 1.0);
225 glPixelStorei(GL_PACK_ALIGNMENT, 1);
226 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
230 opengl1_init_func_pointers();
231 opengl1_tcache_init();
238 void gr_opengl1_activate(int active)
243 // don't grab key/mouse if cmdline says so or if we're fullscreen
244 // if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
245 // SDL_WM_GrabInput(SDL_GRAB_ON);
250 // let go of mouse/keyboard
251 // SDL_WM_GrabInput(SDL_GRAB_OFF);
255 void gr_opengl1_clear()
257 glClearColor(gr_screen.current_clear_color.red / 255.0,
258 gr_screen.current_clear_color.green / 255.0,
259 gr_screen.current_clear_color.blue / 255.0, 1.0);
261 glClear( GL_COLOR_BUFFER_BIT );
264 void gr_opengl1_flip()
266 if ( !GL_one_inited ) {
274 Gr_opengl_mouse_saved = 0;
276 if ( mouse_is_visible() ) {
280 mouse_get_pos( &mx, &my );
282 gr_opengl1_save_mouse_area(mx,my,32,32);
284 if (Gr_cursor == -1) {
286 gr_set_color(255,255,255);
287 gr_line(mx, my, mx+7, my + 7);
288 gr_line(mx, my, mx+5, my );
289 gr_line(mx, my, mx, my+5);
292 gr_set_bitmap(Gr_cursor);
298 GLenum error = GL_NO_ERROR;
301 error = glGetError();
303 if (error != GL_NO_ERROR) {
304 nprintf(("Warning", "!!DEBUG!! OpenGL Error: %d\n", error));
306 } while (error != GL_NO_ERROR);
309 SDL_GL_SwapWindow(GL_window);
311 opengl1_tcache_frame();
313 int cnt = GL_activate;
316 opengl1_tcache_flush();
317 // gr_opengl_clip_cursor(1); /* mouse grab, see opengl_activate */
323 // gr_opengl_clip_cursor(0); /* mouse grab, see opengl_activate */
327 void gr_opengl1_set_clip(int x,int y,int w,int h)
329 // check for sanity of parameters
335 if (x >= gr_screen.max_w)
336 x = gr_screen.max_w - 1;
337 if (y >= gr_screen.max_h)
338 y = gr_screen.max_h - 1;
340 if (x + w > gr_screen.max_w)
341 w = gr_screen.max_w - x;
342 if (y + h > gr_screen.max_h)
343 h = gr_screen.max_h - y;
345 if (w > gr_screen.max_w)
347 if (h > gr_screen.max_h)
350 gr_screen.offset_x = x;
351 gr_screen.offset_y = y;
352 gr_screen.clip_left = 0;
353 gr_screen.clip_right = w-1;
354 gr_screen.clip_top = 0;
355 gr_screen.clip_bottom = h-1;
356 gr_screen.clip_width = w;
357 gr_screen.clip_height = h;
359 x = fl2i((x * GL_viewport_scale_w) + 0.5f) + GL_viewport_x;
360 y = fl2i((y * GL_viewport_scale_h) + 0.5f) + GL_viewport_y;
361 w = fl2i((w * GL_viewport_scale_w) + 0.5f);
362 h = fl2i((h * GL_viewport_scale_h) + 0.5f);
364 glEnable(GL_SCISSOR_TEST);
365 glScissor(x, GL_viewport_h-y-h, w, h);
368 void gr_opengl1_reset_clip()
370 gr_screen.offset_x = 0;
371 gr_screen.offset_y = 0;
372 gr_screen.clip_left = 0;
373 gr_screen.clip_top = 0;
374 gr_screen.clip_right = gr_screen.max_w - 1;
375 gr_screen.clip_bottom = gr_screen.max_h - 1;
376 gr_screen.clip_width = gr_screen.max_w;
377 gr_screen.clip_height = gr_screen.max_h;
379 glDisable(GL_SCISSOR_TEST);
382 void gr_opengl1_print_screen(const char *filename)
384 char tmp[MAX_FILENAME_LEN];
387 strcpy( tmp, filename );
388 strcat( tmp, NOX(".tga"));
390 buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
396 CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
403 // Write the TGA header
404 cfwrite_ubyte( 0, f ); // IDLength;
405 cfwrite_ubyte( 0, f ); // ColorMapType;
406 cfwrite_ubyte( 2, f ); // ImageType; // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
407 cfwrite_ushort( 0, f ); // CMapStart;
408 cfwrite_ushort( 0, f ); // CMapLength;
409 cfwrite_ubyte( 0, f ); // CMapDepth;
410 cfwrite_ushort( 0, f ); // XOffset;
411 cfwrite_ushort( 0, f ); // YOffset;
412 cfwrite_ushort( (ushort)GL_viewport_w, f ); // Width;
413 cfwrite_ushort( (ushort)GL_viewport_h, f ); // Height;
414 cfwrite_ubyte( 24, f ); //PixelDepth;
415 cfwrite_ubyte( 0, f ); //ImageDesc;
417 memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
419 glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_BGR, GL_UNSIGNED_BYTE, buf);
421 cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
428 void gr_opengl1_fog_set(int fog_mode, int r, int g, int b, float fog_near, float fog_far)
430 SDL_assert((r >= 0) && (r < 256));
431 SDL_assert((g >= 0) && (g < 256));
432 SDL_assert((b >= 0) && (b < 256));
434 if (fog_mode == GR_FOGMODE_NONE) {
435 if (gr_screen.current_fog_mode != fog_mode) {
438 if (OGL_fog_mode == 1) {
439 glDisable(GL_COLOR_SUM);
443 gr_screen.current_fog_mode = fog_mode;
448 if (gr_screen.current_fog_mode != fog_mode) {
451 if (OGL_fog_mode == 1) {
452 glEnable(GL_COLOR_SUM);
453 } else if (OGL_fog_mode == 2) {
454 glFogi(GL_FOG_MODE, GL_LINEAR);
457 gr_screen.current_fog_mode = fog_mode;
460 if ( (gr_screen.current_fog_color.red != r) ||
461 (gr_screen.current_fog_color.green != g) ||
462 (gr_screen.current_fog_color.blue != b) ) {
465 gr_opengl_init_color( &gr_screen.current_fog_color, r, g, b );
467 fc[0] = (float)r/255.0;
468 fc[1] = (float)g/255.0;
469 fc[2] = (float)b/255.0;
472 glFogfv(GL_FOG_COLOR, fc);
475 if( (fog_near >= 0.0f) && (fog_far >= 0.0f) &&
476 ((fog_near != gr_screen.fog_near) ||
477 (fog_far != gr_screen.fog_far)) ) {
478 gr_screen.fog_near = fog_near;
479 gr_screen.fog_far = fog_far;
481 if (OGL_fog_mode == 2) {
482 glFogf(GL_FOG_START, fog_near);
483 glFogf(GL_FOG_END, fog_far);
488 void gr_opengl1_set_cull(int cull)
491 glEnable (GL_CULL_FACE);
492 glFrontFace (GL_CCW);
494 glDisable (GL_CULL_FACE);
498 void gr_opengl1_zbuffer_clear(int mode)
502 Gr_zbuffering_mode = GR_ZBUFF_FULL;
503 Gr_global_zbuffering = 1;
505 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_NONE, ZBUFFER_TYPE_FULL );
506 glClear ( GL_DEPTH_BUFFER_BIT );
509 Gr_zbuffering_mode = GR_ZBUFF_NONE;
510 Gr_global_zbuffering = 0;
514 void gr_opengl1_fade_in(int instantaneous)
519 void gr_opengl1_fade_out(int instantaneous)
524 void gr_opengl1_get_region(int front, int w, int h, ubyte *data)
527 glReadBuffer(GL_FRONT);
529 glReadBuffer(GL_BACK);
532 opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
534 glPixelStorei(GL_UNPACK_ROW_LENGTH, GL_viewport_w);
536 int x = GL_viewport_x;
537 int y = (GL_viewport_y+GL_viewport_h)-h-1;
539 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
541 if (gr_screen.bytes_per_pixel == 4) {
542 pxtype = GL_UNSIGNED_BYTE;
545 glReadPixels(x, y, w, h, GL_BGRA, pxtype, data);
547 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
550 void gr_opengl1_save_mouse_area(int x, int y, int w, int h)
554 w = fl2i((w * GL_viewport_scale_w) + 0.5f);
555 h = fl2i((h * GL_viewport_scale_h) + 0.5f);
562 CAP(x1, 0, GL_viewport_w);
563 CAP(x2, 0, GL_viewport_w);
564 CAP(y1, 0, GL_viewport_h);
565 CAP(y2, 0, GL_viewport_h);
567 Gr_opengl_mouse_saved_x = x1;
568 Gr_opengl_mouse_saved_y = y1;
569 Gr_opengl_mouse_saved_w = x2 - x1 + 1;
570 Gr_opengl_mouse_saved_h = y2 - y1 + 1;
572 if ( (Gr_opengl_mouse_saved_w < 1) || (Gr_opengl_mouse_saved_h < 1) ) {
576 if (Gr_opengl_mouse_saved_data == NULL) {
577 Gr_opengl_mouse_saved_data = (ubyte*)malloc(w * h * gr_screen.bytes_per_pixel);
579 if ( !Gr_opengl_mouse_saved_data ) {
584 opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
586 x1 = GL_viewport_x+Gr_opengl_mouse_saved_x;
587 y1 = (GL_viewport_y+GL_viewport_h)-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
589 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
591 if (gr_screen.bytes_per_pixel == 4) {
592 pxtype = GL_UNSIGNED_BYTE;
595 glReadBuffer(GL_BACK);
596 glReadPixels(x1, y1, Gr_opengl_mouse_saved_w, Gr_opengl_mouse_saved_h,
597 GL_BGRA, pxtype, Gr_opengl_mouse_saved_data);
599 Gr_opengl_mouse_saved = 1;
602 int gr_opengl1_save_screen()
606 if (Gr_saved_screen_tex) {
607 mprintf(( "Screen already saved!\n" ));
611 glGenTextures(1, &Gr_saved_screen_tex);
613 if ( !Gr_saved_screen_tex ) {
614 mprintf(( "Couldn't create texture for saved screen!\n" ));
618 opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
620 glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
622 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
623 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
624 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
625 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
626 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
628 glReadBuffer(GL_FRONT);
629 glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, GL_viewport_x, GL_viewport_y,
630 GL_viewport_w, GL_viewport_h, 0);
632 if (Gr_opengl_mouse_saved) {
633 int x = Gr_opengl_mouse_saved_x;
634 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
636 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
638 if (gr_screen.bytes_per_pixel == 4) {
639 pxtype = GL_UNSIGNED_BYTE;
642 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
643 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
644 Gr_opengl_mouse_saved_data);
647 glBindTexture(GL_TEXTURE_2D, 0);
652 void gr_opengl1_restore_screen(int id)
656 if ( !Gr_saved_screen_tex ) {
661 glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
663 if (Gr_opengl_mouse_saved) {
664 int x = Gr_opengl_mouse_saved_x;
665 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
667 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
669 if (gr_screen.bytes_per_pixel == 4) {
670 pxtype = GL_UNSIGNED_BYTE;
673 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
674 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
675 Gr_opengl_mouse_saved_data);
678 glMatrixMode(GL_MODELVIEW);
681 glScalef(1.0f, -1.0f, 1.0f);
683 int tex_coord[] = { 0, 0, 0, 1, 1, 0, 1, 1 };
684 int ver_coord[] = { GL_viewport_x, GL_viewport_y, GL_viewport_x,
685 GL_viewport_h, GL_viewport_w, GL_viewport_y, GL_viewport_w,
689 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
690 glEnableClientState(GL_VERTEX_ARRAY);
692 glTexCoordPointer(2, GL_INT, 0, &tex_coord);
693 glVertexPointer(2, GL_INT, 0, &ver_coord);
695 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
697 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
698 glDisableClientState(GL_VERTEX_ARRAY);
702 glBindTexture(GL_TEXTURE_2D, 0);
705 void gr_opengl1_free_screen(int id)
707 if (Gr_saved_screen_tex) {
708 glDeleteTextures(1, &Gr_saved_screen_tex);
709 Gr_saved_screen_tex = 0;
713 void gr_opengl1_dump_frame_start(int first_frame, int frames_between_dumps)
718 void gr_opengl1_dump_frame_stop()
723 void gr_opengl1_dump_frame()
728 uint gr_opengl1_lock()
733 void gr_opengl1_unlock()
737 void gr_opengl1_zbias(int bias)
740 glEnable(GL_POLYGON_OFFSET_FILL);
741 glPolygonOffset(0.0, -bias);
743 glDisable(GL_POLYGON_OFFSET_FILL);