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;
37 #define CLAMP(x,r1,r2) do { if ( (x) < (r1) ) (x) = (r1); else if ((x) > (r2)) (x) = (r2); } while(0)
40 PFNGLSECONDARYCOLORPOINTERPROC vglSecondaryColorPointer = NULL;
43 static gr_alpha_blend GL_current_alpha_blend = (gr_alpha_blend) -1;
44 static gr_zbuffer_type GL_current_zbuffer_type = (gr_zbuffer_type) -1;
46 void opengl1_set_state(gr_texture_source ts, gr_alpha_blend ab, gr_zbuffer_type zt)
48 opengl1_set_texture_state(ts);
50 if (ab != GL_current_alpha_blend) {
52 case ALPHA_BLEND_NONE: // 1*SrcPixel + 0*DestPixel
53 glBlendFunc(GL_ONE, GL_ZERO);
55 case ALPHA_BLEND_ADDITIVE: // 1*SrcPixel + 1*DestPixel
56 glBlendFunc(GL_ONE, GL_ONE);
58 case ALPHA_BLEND_ALPHA_ADDITIVE: // Alpha*SrcPixel + 1*DestPixel
59 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
61 case ALPHA_BLEND_ALPHA_BLEND_ALPHA: // Alpha*SrcPixel + (1-Alpha)*DestPixel
62 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
64 case ALPHA_BLEND_ALPHA_BLEND_SRC_COLOR: // Alpha*SrcPixel + (1-SrcPixel)*DestPixel
65 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_COLOR);
71 GL_current_alpha_blend = ab;
74 if (zt != GL_current_zbuffer_type) {
76 case ZBUFFER_TYPE_NONE:
77 glDepthFunc(GL_ALWAYS);
78 glDepthMask(GL_FALSE);
80 case ZBUFFER_TYPE_READ:
82 glDepthMask(GL_FALSE);
84 case ZBUFFER_TYPE_WRITE:
85 glDepthFunc(GL_ALWAYS);
88 case ZBUFFER_TYPE_FULL:
96 GL_current_zbuffer_type = zt;
100 void opengl1_cleanup()
102 if ( !GL_one_inited ) {
106 gr_opengl1_reset_clip();
110 opengl1_tcache_cleanup();
115 static void opengl1_init_func_pointers()
117 gr_screen.gf_flip = gr_opengl1_flip;
118 gr_screen.gf_set_clip = gr_opengl1_set_clip;
119 gr_screen.gf_reset_clip = gr_opengl1_reset_clip;
120 gr_screen.gf_set_font = grx_set_font;
122 gr_screen.gf_set_color = gr_opengl_set_color;
123 gr_screen.gf_set_bitmap = gr_opengl_set_bitmap;
124 gr_screen.gf_create_shader = gr_opengl_create_shader;
125 gr_screen.gf_set_shader = gr_opengl_set_shader;
126 gr_screen.gf_clear = gr_opengl1_clear;
128 gr_screen.gf_aabitmap = gr_opengl1_aabitmap;
129 gr_screen.gf_aabitmap_ex = gr_opengl1_aabitmap_ex;
131 gr_screen.gf_rect = gr_opengl1_rect;
132 gr_screen.gf_shade = gr_opengl1_shade;
133 gr_screen.gf_string = gr_opengl1_string;
134 gr_screen.gf_circle = gr_opengl1_circle;
136 gr_screen.gf_line = gr_opengl1_line;
137 gr_screen.gf_aaline = gr_opengl1_aaline;
138 gr_screen.gf_pixel = gr_opengl1_pixel;
139 gr_screen.gf_scaler = gr_opengl1_scaler;
140 gr_screen.gf_tmapper = gr_opengl1_tmapper;
142 gr_screen.gf_gradient = gr_opengl1_gradient;
144 gr_screen.gf_get_color = gr_opengl_get_color;
145 gr_screen.gf_init_color = gr_opengl_init_color;
146 gr_screen.gf_init_alphacolor = gr_opengl_init_alphacolor;
147 gr_screen.gf_set_color_fast = gr_opengl_set_color_fast;
148 gr_screen.gf_print_screen = gr_opengl1_print_screen;
150 gr_screen.gf_fade_in = gr_opengl1_fade_in;
151 gr_screen.gf_fade_out = gr_opengl1_fade_out;
152 gr_screen.gf_flash = gr_opengl1_flash;
154 gr_screen.gf_zbuffer_get = gr_opengl_zbuffer_get;
155 gr_screen.gf_zbuffer_set = gr_opengl_zbuffer_set;
156 gr_screen.gf_zbuffer_clear = gr_opengl1_zbuffer_clear;
158 gr_screen.gf_save_screen = gr_opengl1_save_screen;
159 gr_screen.gf_restore_screen = gr_opengl1_restore_screen;
160 gr_screen.gf_free_screen = gr_opengl1_free_screen;
162 gr_screen.gf_dump_frame_start = gr_opengl1_dump_frame_start;
163 gr_screen.gf_dump_frame_stop = gr_opengl1_dump_frame_stop;
164 gr_screen.gf_dump_frame = gr_opengl1_dump_frame;
166 gr_screen.gf_set_gamma = gr_opengl1_set_gamma;
168 gr_screen.gf_lock = gr_opengl1_lock;
169 gr_screen.gf_unlock = gr_opengl1_unlock;
171 gr_screen.gf_fog_set = gr_opengl1_fog_set;
173 gr_screen.gf_get_region = gr_opengl1_get_region;
175 gr_screen.gf_set_cull = gr_opengl1_set_cull;
177 gr_screen.gf_cross_fade = gr_opengl1_cross_fade;
179 gr_screen.gf_set_clear_color = gr_opengl_set_clear_color;
181 gr_screen.gf_preload_init = gr_opengl1_preload_init;
182 gr_screen.gf_preload = gr_opengl1_preload;
184 gr_screen.gf_zbias = gr_opengl1_zbias;
186 gr_screen.gf_force_windowed = gr_opengl_force_windowed;
187 gr_screen.gf_force_fullscreen = gr_opengl_force_fullscreen;
188 gr_screen.gf_set_viewport = gr_opengl_set_viewport;
190 gr_screen.gf_activate = gr_opengl1_activate;
200 1 = use secondary color ext
201 2 = use opengl linear fog
205 // only available with OpenGL 1.2+, must get ptr for Windows
206 vglSecondaryColorPointer = (PFNGLSECONDARYCOLORPOINTERPROC)SDL_GL_GetProcAddress("glSecondaryColorPointer");
208 if (vglSecondaryColorPointer) {
214 glShadeModel(GL_SMOOTH);
216 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
217 glHint(GL_FOG_HINT, GL_NICEST);
219 glEnable(GL_DEPTH_TEST);
222 glEnable(GL_TEXTURE_2D);
224 glDepthRange(0.0, 1.0);
226 glPixelStorei(GL_PACK_ALIGNMENT, 1);
227 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
231 opengl1_init_func_pointers();
232 opengl1_tcache_init();
239 void gr_opengl1_activate(int active)
244 // don't grab key/mouse if cmdline says so or if we're fullscreen
245 // if(!Cmdline_no_grab && !(SDL_GetVideoSurface()->flags & SDL_FULLSCREEN)) {
246 // SDL_WM_GrabInput(SDL_GRAB_ON);
251 // let go of mouse/keyboard
252 // SDL_WM_GrabInput(SDL_GRAB_OFF);
256 void gr_opengl1_clear()
258 glClearColor(gr_screen.current_clear_color.red / 255.0,
259 gr_screen.current_clear_color.green / 255.0,
260 gr_screen.current_clear_color.blue / 255.0, 1.0);
262 glClear( GL_COLOR_BUFFER_BIT );
265 void gr_opengl1_flip()
267 if ( !GL_one_inited ) {
275 Gr_opengl_mouse_saved = 0;
277 if ( mouse_is_visible() ) {
281 mouse_get_pos( &mx, &my );
283 gr_opengl1_save_mouse_area(mx,my,32,32);
285 if (Gr_cursor == -1) {
287 gr_set_color(255,255,255);
288 gr_line(mx, my, mx+7, my + 7);
289 gr_line(mx, my, mx+5, my );
290 gr_line(mx, my, mx, my+5);
293 gr_set_bitmap(Gr_cursor);
299 GLenum error = GL_NO_ERROR;
302 error = glGetError();
304 if (error != GL_NO_ERROR) {
305 nprintf(("Warning", "!!DEBUG!! OpenGL Error: %d\n", error));
307 } while (error != GL_NO_ERROR);
310 SDL_GL_SwapWindow(GL_window);
312 opengl1_tcache_frame();
314 int cnt = GL_activate;
317 opengl1_tcache_flush();
318 // gr_opengl_clip_cursor(1); /* mouse grab, see opengl_activate */
324 // gr_opengl_clip_cursor(0); /* mouse grab, see opengl_activate */
328 void gr_opengl1_set_clip(int x,int y,int w,int h)
330 // check for sanity of parameters
336 if (x >= gr_screen.max_w)
337 x = gr_screen.max_w - 1;
338 if (y >= gr_screen.max_h)
339 y = gr_screen.max_h - 1;
341 if (x + w > gr_screen.max_w)
342 w = gr_screen.max_w - x;
343 if (y + h > gr_screen.max_h)
344 h = gr_screen.max_h - y;
346 if (w > gr_screen.max_w)
348 if (h > gr_screen.max_h)
351 gr_screen.offset_x = x;
352 gr_screen.offset_y = y;
353 gr_screen.clip_left = 0;
354 gr_screen.clip_right = w-1;
355 gr_screen.clip_top = 0;
356 gr_screen.clip_bottom = h-1;
357 gr_screen.clip_width = w;
358 gr_screen.clip_height = h;
360 x = fl2i((x * GL_viewport_scale_w) + 0.5f) + GL_viewport_x;
361 y = fl2i((y * GL_viewport_scale_h) + 0.5f) + GL_viewport_y;
362 w = fl2i((w * GL_viewport_scale_w) + 0.5f);
363 h = fl2i((h * GL_viewport_scale_h) + 0.5f);
365 glEnable(GL_SCISSOR_TEST);
366 glScissor(x, GL_viewport_h-y-h, w, h);
369 void gr_opengl1_reset_clip()
371 gr_screen.offset_x = 0;
372 gr_screen.offset_y = 0;
373 gr_screen.clip_left = 0;
374 gr_screen.clip_top = 0;
375 gr_screen.clip_right = gr_screen.max_w - 1;
376 gr_screen.clip_bottom = gr_screen.max_h - 1;
377 gr_screen.clip_width = gr_screen.max_w;
378 gr_screen.clip_height = gr_screen.max_h;
380 glDisable(GL_SCISSOR_TEST);
383 void gr_opengl1_print_screen(const char *filename)
385 char tmp[MAX_FILENAME_LEN];
388 strcpy( tmp, filename );
389 strcat( tmp, NOX(".tga"));
391 buf = (ubyte*)malloc(GL_viewport_w * GL_viewport_h * 3);
397 CFILE *f = cfopen(tmp, "wb", CFILE_NORMAL, CF_TYPE_ROOT);
404 // Write the TGA header
405 cfwrite_ubyte( 0, f ); // IDLength;
406 cfwrite_ubyte( 0, f ); // ColorMapType;
407 cfwrite_ubyte( 2, f ); // ImageType; // 2 = 24bpp, uncompressed, 10=24bpp rle compressed
408 cfwrite_ushort( 0, f ); // CMapStart;
409 cfwrite_ushort( 0, f ); // CMapLength;
410 cfwrite_ubyte( 0, f ); // CMapDepth;
411 cfwrite_ushort( 0, f ); // XOffset;
412 cfwrite_ushort( 0, f ); // YOffset;
413 cfwrite_ushort( (ushort)GL_viewport_w, f ); // Width;
414 cfwrite_ushort( (ushort)GL_viewport_h, f ); // Height;
415 cfwrite_ubyte( 24, f ); //PixelDepth;
416 cfwrite_ubyte( 0, f ); //ImageDesc;
418 memset(buf, 0, GL_viewport_w * GL_viewport_h * 3);
420 glReadPixels(GL_viewport_x, GL_viewport_y, GL_viewport_w, GL_viewport_h, GL_BGR, GL_UNSIGNED_BYTE, buf);
422 cfwrite(buf, GL_viewport_w * GL_viewport_h * 3, 1, f);
429 void gr_opengl1_fog_set(int fog_mode, int r, int g, int b, float fog_near, float fog_far)
431 Assert((r >= 0) && (r < 256));
432 Assert((g >= 0) && (g < 256));
433 Assert((b >= 0) && (b < 256));
435 if (fog_mode == GR_FOGMODE_NONE) {
436 if (gr_screen.current_fog_mode != fog_mode) {
439 if (OGL_fog_mode == 1) {
440 glDisable(GL_COLOR_SUM);
444 gr_screen.current_fog_mode = fog_mode;
449 if (gr_screen.current_fog_mode != fog_mode) {
452 if (OGL_fog_mode == 1) {
453 glEnable(GL_COLOR_SUM);
454 } else if (OGL_fog_mode == 2) {
455 glFogi(GL_FOG_MODE, GL_LINEAR);
458 gr_screen.current_fog_mode = fog_mode;
461 if ( (gr_screen.current_fog_color.red != r) ||
462 (gr_screen.current_fog_color.green != g) ||
463 (gr_screen.current_fog_color.blue != b) ) {
466 gr_opengl_init_color( &gr_screen.current_fog_color, r, g, b );
468 fc[0] = (float)r/255.0;
469 fc[1] = (float)g/255.0;
470 fc[2] = (float)b/255.0;
473 glFogfv(GL_FOG_COLOR, fc);
476 if( (fog_near >= 0.0f) && (fog_far >= 0.0f) &&
477 ((fog_near != gr_screen.fog_near) ||
478 (fog_far != gr_screen.fog_far)) ) {
479 gr_screen.fog_near = fog_near;
480 gr_screen.fog_far = fog_far;
482 if (OGL_fog_mode == 2) {
483 glFogf(GL_FOG_START, fog_near);
484 glFogf(GL_FOG_END, fog_far);
489 void gr_opengl1_set_cull(int cull)
492 glEnable (GL_CULL_FACE);
493 glFrontFace (GL_CCW);
495 glDisable (GL_CULL_FACE);
499 void gr_opengl1_zbuffer_clear(int mode)
503 gr_zbuffering_mode = GR_ZBUFF_FULL;
504 gr_global_zbuffering = 1;
506 opengl1_set_state( TEXTURE_SOURCE_NONE, ALPHA_BLEND_NONE, ZBUFFER_TYPE_FULL );
507 glClear ( GL_DEPTH_BUFFER_BIT );
510 gr_zbuffering_mode = GR_ZBUFF_NONE;
511 gr_global_zbuffering = 0;
515 void gr_opengl1_fade_in(int instantaneous)
520 void gr_opengl1_fade_out(int instantaneous)
525 void gr_opengl1_get_region(int front, int w, int h, ubyte *data)
528 glReadBuffer(GL_FRONT);
530 glReadBuffer(GL_BACK);
533 opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
535 glPixelStorei(GL_UNPACK_ROW_LENGTH, GL_viewport_w);
537 int x = GL_viewport_x;
538 int y = (GL_viewport_y+GL_viewport_h)-h-1;
540 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
542 if (gr_screen.bytes_per_pixel == 4) {
543 pxtype = GL_UNSIGNED_BYTE;
546 glReadPixels(x, y, w, h, GL_BGRA, pxtype, data);
548 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
551 void gr_opengl1_save_mouse_area(int x, int y, int w, int h)
555 w = fl2i((w * GL_viewport_scale_w) + 0.5f);
556 h = fl2i((h * GL_viewport_scale_h) + 0.5f);
563 CLAMP(x1, 0, GL_viewport_w);
564 CLAMP(x2, 0, GL_viewport_w);
565 CLAMP(y1, 0, GL_viewport_h);
566 CLAMP(y2, 0, GL_viewport_h);
568 Gr_opengl_mouse_saved_x = x1;
569 Gr_opengl_mouse_saved_y = y1;
570 Gr_opengl_mouse_saved_w = x2 - x1 + 1;
571 Gr_opengl_mouse_saved_h = y2 - y1 + 1;
573 if ( (Gr_opengl_mouse_saved_w < 1) || (Gr_opengl_mouse_saved_h < 1) ) {
577 if (Gr_opengl_mouse_saved_data == NULL) {
578 Gr_opengl_mouse_saved_data = (ubyte*)malloc(w * h * gr_screen.bytes_per_pixel);
580 if ( !Gr_opengl_mouse_saved_data ) {
585 opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
587 x1 = GL_viewport_x+Gr_opengl_mouse_saved_x;
588 y1 = (GL_viewport_y+GL_viewport_h)-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
590 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
592 if (gr_screen.bytes_per_pixel == 4) {
593 pxtype = GL_UNSIGNED_BYTE;
596 glReadBuffer(GL_BACK);
597 glReadPixels(x1, y1, Gr_opengl_mouse_saved_w, Gr_opengl_mouse_saved_h,
598 GL_BGRA, pxtype, Gr_opengl_mouse_saved_data);
600 Gr_opengl_mouse_saved = 1;
603 int gr_opengl1_save_screen()
607 if (Gr_saved_screen_tex) {
608 mprintf(( "Screen already saved!\n" ));
612 glGenTextures(1, &Gr_saved_screen_tex);
614 if ( !Gr_saved_screen_tex ) {
615 mprintf(( "Couldn't create texture for saved screen!\n" ));
619 opengl1_set_state(TEXTURE_SOURCE_NO_FILTERING, ALPHA_BLEND_NONE, ZBUFFER_TYPE_NONE);
621 glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
623 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
624 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
625 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
626 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
627 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
629 glReadBuffer(GL_FRONT);
630 glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, GL_viewport_x, GL_viewport_y,
631 GL_viewport_w, GL_viewport_h, 0);
633 if (Gr_opengl_mouse_saved) {
634 int x = Gr_opengl_mouse_saved_x;
635 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
637 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
639 if (gr_screen.bytes_per_pixel == 4) {
640 pxtype = GL_UNSIGNED_BYTE;
643 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
644 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
645 Gr_opengl_mouse_saved_data);
648 glBindTexture(GL_TEXTURE_2D, 0);
653 void gr_opengl1_restore_screen(int id)
657 if ( !Gr_saved_screen_tex ) {
662 glBindTexture(GL_TEXTURE_2D, Gr_saved_screen_tex);
664 if (Gr_opengl_mouse_saved) {
665 int x = Gr_opengl_mouse_saved_x;
666 int y = GL_viewport_h-Gr_opengl_mouse_saved_y-Gr_opengl_mouse_saved_h;
668 GLenum pxtype = GL_UNSIGNED_SHORT_1_5_5_5_REV;
670 if (gr_screen.bytes_per_pixel == 4) {
671 pxtype = GL_UNSIGNED_BYTE;
674 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, Gr_opengl_mouse_saved_w,
675 Gr_opengl_mouse_saved_h, GL_BGRA, pxtype,
676 Gr_opengl_mouse_saved_data);
679 glMatrixMode(GL_MODELVIEW);
682 glScalef(1.0f, -1.0f, 1.0f);
684 int tex_coord[] = { 0, 0, 0, 1, 1, 1, 1, 0 };
685 int ver_coord[] = { GL_viewport_x, GL_viewport_y, GL_viewport_x,
686 GL_viewport_h, GL_viewport_w, GL_viewport_h, GL_viewport_w,
690 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
691 glEnableClientState(GL_VERTEX_ARRAY);
693 glTexCoordPointer(2, GL_INT, 0, &tex_coord);
694 glVertexPointer(2, GL_INT, 0, &ver_coord);
696 glDrawArrays(GL_QUADS, 0, 4);
698 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
699 glDisableClientState(GL_VERTEX_ARRAY);
703 glBindTexture(GL_TEXTURE_2D, 0);
706 void gr_opengl1_free_screen(int id)
708 if (Gr_saved_screen_tex) {
709 glDeleteTextures(1, &Gr_saved_screen_tex);
710 Gr_saved_screen_tex = 0;
714 void gr_opengl1_dump_frame_start(int first_frame, int frames_between_dumps)
719 void gr_opengl1_dump_frame_stop()
724 void gr_opengl1_dump_frame()
729 uint gr_opengl1_lock()
734 void gr_opengl1_unlock()
738 void gr_opengl1_zbias(int bias)
741 glEnable(GL_POLYGON_OFFSET_FILL);
742 glPolygonOffset(0.0, -bias);
744 glDisable(GL_POLYGON_OFFSET_FILL);