2 * $Logfile: /Freespace2/code/Graphics/GrOpenGL.cpp $
7 * Code that uses the OpenGL graphics library
10 * Revision 1.3 2002/05/27 22:35:01 theoddone33
13 * Revision 1.2 2002/05/27 22:32:02 theoddone33
14 * throw all d3d stuff at opengl
16 * Revision 1.1.1.1 2002/05/03 03:28:09 root
20 * 10 7/14/99 9:42a Dave
21 * Put in clear_color debug function. Put in base for 3dnow stuff / P3
24 * 9 7/09/99 9:51a Dave
25 * Added thick polyline code.
27 * 8 6/29/99 10:35a Dave
28 * Interface polygon bitmaps! Whee!
30 * 7 2/03/99 11:44a Dave
31 * Fixed d3d transparent textures.
33 * 6 1/24/99 11:37p Dave
34 * First full rev of beam weapons. Very customizable. Removed some bogus
35 * Int3()'s in low level net code.
37 * 5 12/18/98 1:13a Dave
38 * Rough 1024x768 support for Direct3D. Proper detection and usage through
41 * 4 12/06/98 2:36p Dave
42 * Drastically improved nebula fogging.
44 * 3 11/11/98 5:37p Dave
45 * Checkin for multiplayer testing.
47 * 2 10/07/98 10:53a Dave
50 * 1 10/07/98 10:49a Dave
52 * 14 5/20/98 9:46p John
53 * added code so the places in code that change half the palette don't
54 * have to clear the screen.
56 * 13 5/06/98 5:30p John
57 * Removed unused cfilearchiver. Removed/replaced some unused/little used
58 * graphics functions, namely gradient_h and _v and pixel_sp. Put in new
59 * DirectX header files and libs that fixed the Direct3D alpha blending
62 * 12 4/14/98 12:15p John
63 * Made 16-bpp movies work.
65 * 11 3/12/98 5:36p John
66 * Took out any unused shaders. Made shader code take rgbc instead of
67 * matrix and vector since noone used it like a matrix and it would have
68 * been impossible to do in hardware. Made Glide implement a basic
69 * shader for online help.
71 * 10 3/10/98 4:18p John
72 * Cleaned up graphics lib. Took out most unused gr functions. Made D3D
73 * & Glide have popups and print screen. Took out all >8bpp software
74 * support. Made Fred zbuffer. Made zbuffer allocate dynamically to
75 * support Fred. Made zbuffering key off of functions rather than one
78 * 9 12/02/97 4:00p John
79 * Added first rev of thruster glow, along with variable levels of
80 * translucency, which retquired some restructing of palman.
82 * 8 10/03/97 9:10a John
83 * added better antialiased line drawer
85 * 7 9/23/97 10:45a John
86 * made so you can tell bitblt code to rle a bitmap by passing flag to
89 * 6 9/09/97 11:01a Sandeep
90 * fixed warning level 4 bugs
92 * 5 7/10/97 2:06p John
93 * added code to specify alphablending type for bitmaps.
95 * 4 6/17/97 7:04p John
96 * added d3d support for gradients.
97 * fixed some color bugs by adding screen signatures instead of watching
98 * flags and palette changes.
100 * 3 6/12/97 2:50a Lawrance
101 * bm_unlock() now passed bitmap number, not pointer
103 * 2 6/11/97 1:12p John
104 * Started fixing all the text colors in the game.
106 * 1 5/12/97 12:14p John
113 #include <windowsx.h>
119 #include "floating.h"
121 #include "grinternal.h"
122 #include "gropengl.h"
125 static int Inited = 0;
127 // Throw in some dummy functions - DDOI
128 void gr_opengl_preload_init()
133 void gr_d3d_preload(int x, int y)
138 void gr_opengl_activate(int b)
148 void d3d_zbias (int a)
154 void gr_opengl_pixel(int x, int y)
156 if ( x < gr_screen.clip_left ) return;
157 if ( x > gr_screen.clip_right ) return;
158 if ( y < gr_screen.clip_top ) return;
159 if ( y > gr_screen.clip_bottom ) return;
162 void gr_opengl_clear()
167 void gr_opengl_flip()
171 void gr_opengl_flip_window(uint _hdc, int x, int y, int w, int h )
175 void gr_opengl_set_clip(int x,int y,int w,int h)
177 // check for sanity of parameters
183 if (x >= gr_screen.max_w)
184 x = gr_screen.max_w - 1;
185 if (y >= gr_screen.max_h)
186 y = gr_screen.max_h - 1;
188 if (x + w > gr_screen.max_w)
189 w = gr_screen.max_w - x;
190 if (y + h > gr_screen.max_h)
191 h = gr_screen.max_h - y;
193 if (w > gr_screen.max_w)
195 if (h > gr_screen.max_h)
198 gr_screen.offset_x = x;
199 gr_screen.offset_y = y;
200 gr_screen.clip_left = 0;
201 gr_screen.clip_right = w-1;
202 gr_screen.clip_top = 0;
203 gr_screen.clip_bottom = h-1;
204 gr_screen.clip_width = w;
205 gr_screen.clip_height = h;
208 void gr_opengl_reset_clip()
210 gr_screen.offset_x = 0;
211 gr_screen.offset_y = 0;
212 gr_screen.clip_left = 0;
213 gr_screen.clip_top = 0;
214 gr_screen.clip_right = gr_screen.max_w - 1;
215 gr_screen.clip_bottom = gr_screen.max_h - 1;
216 gr_screen.clip_width = gr_screen.max_w;
217 gr_screen.clip_height = gr_screen.max_h;
220 void gr_opengl_set_font(int fontnum)
224 void gr_opengl_set_color( int r, int g, int b )
226 Assert((r >= 0) && (r < 256));
227 Assert((g >= 0) && (g < 256));
228 Assert((b >= 0) && (b < 256));
230 gr_screen.current_color.red = (unsigned char)r;
231 gr_screen.current_color.green = (unsigned char)g;
232 gr_screen.current_color.blue = (unsigned char)b;
235 void gr_opengl_set_bitmap( int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy )
237 gr_screen.current_alpha = alpha;
238 gr_screen.current_alphablend_mode = alphablend_mode;
239 gr_screen.current_bitblt_mode = bitblt_mode;
240 gr_screen.current_bitmap = bitmap_num;
242 gr_screen.current_bitmap_sx = sx;
243 gr_screen.current_bitmap_sy = sy;
246 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
248 shade->screen_sig = gr_screen.signature;
255 void gr_opengl_set_shader( shader * shade )
258 if (shade->screen_sig != gr_screen.signature) {
259 gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
261 gr_screen.current_shader = *shade;
263 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
268 void gr_opengl_bitmap_ex(int x,int y,int w,int h,int sx,int sy)
274 bmp = bm_lock( gr_screen.current_bitmap, 8, 0 );
275 sptr = (ubyte *)( bmp->data + (sy*bmp->w+sx) );
277 // mprintf(( "x=%d, y=%d, w=%d, h=%d\n", x, y, w, h ));
278 // mprintf(( "sx=%d, sy=%d, bw=%d, bh=%d\n", sx, sy, bmp->w, bmp->h ));
280 for (i=0; i<h; i++ ) {
281 for ( j=0; j<w; j++ ) {
282 gr_set_color( gr_palette[sptr[j]*3+0], gr_palette[sptr[j]*3+1], gr_palette[sptr[j]*3+2] );
283 gr_pixel( x+j, i+y );
287 bm_unlock(gr_screen.current_bitmap);
290 void gr_opengl_bitmap(int x, int y)
294 bm_get_info( gr_screen.current_bitmap, &w, &h, NULL );
295 int dx1=x, dx2=x+w-1;
296 int dy1=y, dy2=y+h-1;
299 if ((dx1 > gr_screen.clip_right ) || (dx2 < gr_screen.clip_left)) return;
300 if ((dy1 > gr_screen.clip_bottom ) || (dy2 < gr_screen.clip_top)) return;
301 if ( dx1 < gr_screen.clip_left ) { sx = gr_screen.clip_left-dx1; dx1 = gr_screen.clip_left; }
302 if ( dy1 < gr_screen.clip_top ) { sy = gr_screen.clip_top-dy1; dy1 = gr_screen.clip_top; }
303 if ( dx2 > gr_screen.clip_right ) { dx2 = gr_screen.clip_right; }
304 if ( dy2 > gr_screen.clip_bottom ) { dy2 = gr_screen.clip_bottom; }
306 if ( sx < 0 ) return;
307 if ( sy < 0 ) return;
308 if ( sx >= w ) return;
309 if ( sy >= h ) return;
311 // Draw bitmap bm[sx,sy] into (dx1,dy1)-(dx2,dy2)
313 gr_bitmap_ex(dx1,dy1,dx2-dx1+1,dy2-dy1+1,sx,sy);
316 static void opengl_scanline(int x1,int x2,int y)
320 void gr_opengl_rect(int x,int y,int w,int h)
355 opengl_scanline( x1, x2, y1+i );
359 void gr_opengl_shade(int x,int y,int w,int h)
363 void opengl_mtext(int x, int y, char *s, int len )
367 void gr_opengl_string(int x,int y,char * text)
374 p = strchr( p1, '\n' );
379 gr_get_string_size( &w, &h, p1 );
382 opengl_mtext(gr_screen.offset_x+(gr_screen.clip_width-w)/2,y+gr_screen.offset_y,p1,strlen(p1));
384 opengl_mtext(gr_screen.offset_x+x,y+gr_screen.offset_y,p1,strlen(p1));
387 if ( p1 && (strlen(p1) < 1) ) p1 = NULL;
395 void gr_opengl_circle( int xc, int yc, int d )
405 if ( (xc+r) < gr_screen.clip_left ) return;
406 if ( (xc-r) > gr_screen.clip_right ) return;
407 if ( (yc+r) < gr_screen.clip_top ) return;
408 if ( (yc-r) > gr_screen.clip_bottom ) return;
411 // Draw the first octant
412 opengl_scanline( xc-y, xc+y, yc-x );
413 opengl_scanline( xc-y, xc+y, yc+x );
418 // Draw the second octant
419 opengl_scanline( xc-x, xc+x, yc-y );
420 opengl_scanline( xc-x, xc+x, yc+y );
427 opengl_scanline( xc-x, xc+x, yc-y );
428 opengl_scanline( xc-x, xc+x, yc+y );
434 void gr_opengl_line(int x1,int y1,int x2,int y2)
441 int clipped = 0, swapped=0;
443 INT_CLIPLINE(x1,y1,x2,y2,gr_screen.clip_left,gr_screen.clip_top,gr_screen.clip_right,gr_screen.clip_bottom,return,clipped=1,swapped=1);
461 for(i=dx+1;i>0;i--) {
473 for(i=dy+1;i>0;i--) {
487 #define FIND_SCALED_NUM(x,x0,x1,y0,y1) (((((x)-(x0))*((y1)-(y0)))/((x1)-(x0)))+(y0))
489 void gr_opengl_scaler(vertex *va, vertex *vb )
491 float x0, y0, x1, y1;
492 float u0, v0, u1, v1;
493 float clipped_x0, clipped_y0, clipped_x1, clipped_y1;
494 float clipped_u0, clipped_v0, clipped_u1, clipped_v1;
495 float xmin, xmax, ymin, ymax;
496 int dx0, dy0, dx1, dy1;
498 //============= CLIP IT =====================
500 x0 = va->sx; y0 = va->sy;
501 x1 = vb->sx; y1 = vb->sy;
503 xmin = i2fl(gr_screen.clip_left); ymin = i2fl(gr_screen.clip_top);
504 xmax = i2fl(gr_screen.clip_right); ymax = i2fl(gr_screen.clip_bottom);
506 u0 = va->u; v0 = va->v;
507 u1 = vb->u; v1 = vb->v;
509 // Check for obviously offscreen bitmaps...
510 if ( (y1<=y0) || (x1<=x0) ) return;
511 if ( (x1<xmin ) || (x0>xmax) ) return;
512 if ( (y1<ymin ) || (y0>ymax) ) return;
514 clipped_u0 = u0; clipped_v0 = v0;
515 clipped_u1 = u1; clipped_v1 = v1;
517 clipped_x0 = x0; clipped_y0 = y0;
518 clipped_x1 = x1; clipped_y1 = y1;
520 // Clip the left, moving u0 right as necessary
522 clipped_u0 = FIND_SCALED_NUM(xmin,x0,x1,u0,u1);
526 // Clip the right, moving u1 left as necessary
528 clipped_u1 = FIND_SCALED_NUM(xmax,x0,x1,u0,u1);
532 // Clip the top, moving v0 down as necessary
534 clipped_v0 = FIND_SCALED_NUM(ymin,y0,y1,v0,v1);
538 // Clip the bottom, moving v1 up as necessary
540 clipped_v1 = FIND_SCALED_NUM(ymax,y0,y1,v0,v1);
544 dx0 = fl2i(clipped_x0); dx1 = fl2i(clipped_x1);
545 dy0 = fl2i(clipped_y0); dy1 = fl2i(clipped_y1);
547 if (dx1<=dx0) return;
548 if (dy1<=dy0) return;
550 //============= DRAW IT =====================
558 tmpu = (clipped_u1-clipped_u0) / (dx1-dx0);
559 if ( fl_abs(tmpu) < 0.001f ) {
560 return; // scaled up way too far!
562 tmpv = (clipped_v1-clipped_v0) / (dy1-dy0);
563 if ( fl_abs(tmpv) < 0.001f ) {
564 return; // scaled up way too far!
567 bp = bm_lock( gr_screen.current_bitmap, 8, 0 );
569 du = fl2f(tmpu*(bp->w-1));
570 dv = fl2f(tmpv*(bp->h-1));
572 v = fl2f(clipped_v0*(bp->h-1));
573 u = fl2f(clipped_u0*(bp->w-1));
576 spixels = (ubyte *)bp->data;
578 for (y=dy0; y<=dy1; y++ ) {
579 sbits = &spixels[bp->rowsize*(v>>16)];
583 for (x=0; x<w; x++ ) {
584 ubyte c = sbits[ tmp_u >> 16 ];
586 gr_set_color( gr_palette[c*3+0], gr_palette[c*3+1], gr_palette[c*3+2] );
587 gr_pixel( x+dx0, y );
594 bm_unlock(gr_screen.current_bitmap);
600 void gr_opengl_tmapper( int nv, vertex * verts[], uint flags )
605 void gr_opengl_gradient(int x1,int y1,int x2,int y2)
609 void gr_opengl_set_palette(ubyte *new_palette, int is_alphacolor)
613 void gr_opengl_get_color( int * r, int * g, int * b )
615 if (r) *r = gr_screen.current_color.red;
616 if (g) *g = gr_screen.current_color.green;
617 if (b) *b = gr_screen.current_color.blue;
620 void gr_opengl_init_color(color *c, int r, int g, int b)
622 gr_screen.current_color.screen_sig = gr_screen.signature;
623 gr_screen.current_color.red = (unsigned char)r;
624 gr_screen.current_color.green = (unsigned char)g;
625 gr_screen.current_color.blue = (unsigned char)b;
628 void gr_opengl_set_color_fast(color *dst)
630 if ( dst->screen_sig != gr_screen.signature ) {
631 gr_init_color( dst, dst->red, dst->green, dst->blue );
634 gr_screen.current_color = *dst;
639 void gr_opengl_print_screen(char *filename)
644 int gr_opengl_supports_res_ingame(int res)
649 int gr_opengl_supports_res_interface(int res)
654 void gr_opengl_cleanup()
656 if ( !Inited ) return;
665 void gr_opengl_fog_set(int fog_mode, int r, int g, int b, float near, float far)
669 void gr_opengl_get_pixel(int x, int y, int *r, int *g, int *b)
673 void gr_opengl_get_region(int front, int w, int g, ubyte *data)
677 void gr_opengl_set_cull(int cull)
681 void gr_opengl_filter_set(int filter)
686 void gr_opengl_cross_fade(int bmap1, int bmap2, int x1, int y1, int x2, int y2, float pct)
690 int gr_opengl_tcache_set(int bitmap_id, int bitmap_type, float *u_ratio, float *v_ratio, int fail_on_full = 0, int sx = -1, int sy = -1, int force = 0)
695 void gr_opengl_set_clear_color(int r, int g, int b)
699 void gr_opengl_init()
706 mprintf(( "Initializing opengl graphics device...\n" ));
711 gr_screen.gf_flip = gr_opengl_flip;
712 gr_screen.gf_flip_window = gr_opengl_flip_window;
713 gr_screen.gf_set_clip = gr_opengl_set_clip;
714 gr_screen.gf_reset_clip = gr_opengl_reset_clip;
715 gr_screen.gf_set_font = gr_opengl_set_font;
716 gr_screen.gf_set_color = gr_opengl_set_color;
717 gr_screen.gf_set_bitmap = gr_opengl_set_bitmap;
718 gr_screen.gf_create_shader = gr_opengl_create_shader;
719 gr_screen.gf_set_shader = gr_opengl_set_shader;
720 gr_screen.gf_clear = gr_opengl_clear;
721 // gr_screen.gf_bitmap = gr_opengl_bitmap;
722 // gr_screen.gf_bitmap_ex = gr_opengl_bitmap_ex;
723 gr_screen.gf_rect = gr_opengl_rect;
724 gr_screen.gf_shade = gr_opengl_shade;
725 gr_screen.gf_string = gr_opengl_string;
726 gr_screen.gf_circle = gr_opengl_circle;
728 gr_screen.gf_line = gr_opengl_line;
729 gr_screen.gf_pixel = gr_opengl_pixel;
730 gr_screen.gf_scaler = gr_opengl_scaler;
731 gr_screen.gf_tmapper = gr_opengl_tmapper;
733 gr_screen.gf_gradient = gr_opengl_gradient;
735 gr_screen.gf_set_palette = gr_opengl_set_palette;
736 gr_screen.gf_get_color = gr_opengl_get_color;
737 gr_screen.gf_init_color = gr_opengl_init_color;
738 gr_screen.gf_set_color_fast = gr_opengl_set_color_fast;
739 gr_screen.gf_print_screen = gr_opengl_print_screen;
741 gr_screen.gf_fog_set = gr_opengl_fog_set;
743 gr_screen.gf_get_region = gr_opengl_get_region;
745 gr_screen.gf_get_pixel = gr_opengl_get_pixel;
747 gr_screen.gf_set_cull = gr_opengl_set_cull;
749 gr_screen.gf_cross_fade = gr_opengl_cross_fade;
751 gr_screen.gf_filter_set = gr_opengl_filter_set;
753 gr_screen.gf_tcache_set = gr_opengl_tcache_set;
755 gr_screen.gf_set_clear_color = gr_opengl_set_clear_color;