2 * $Logfile: /Freespace2/code/Graphics/GrOpenGL.cpp $
7 * Code that uses the OpenGL graphics library
10 * Revision 1.2 2002/05/27 22:32:02 theoddone33
11 * throw all d3d stuff at opengl
13 * Revision 1.1.1.1 2002/05/03 03:28:09 root
17 * 10 7/14/99 9:42a Dave
18 * Put in clear_color debug function. Put in base for 3dnow stuff / P3
21 * 9 7/09/99 9:51a Dave
22 * Added thick polyline code.
24 * 8 6/29/99 10:35a Dave
25 * Interface polygon bitmaps! Whee!
27 * 7 2/03/99 11:44a Dave
28 * Fixed d3d transparent textures.
30 * 6 1/24/99 11:37p Dave
31 * First full rev of beam weapons. Very customizable. Removed some bogus
32 * Int3()'s in low level net code.
34 * 5 12/18/98 1:13a Dave
35 * Rough 1024x768 support for Direct3D. Proper detection and usage through
38 * 4 12/06/98 2:36p Dave
39 * Drastically improved nebula fogging.
41 * 3 11/11/98 5:37p Dave
42 * Checkin for multiplayer testing.
44 * 2 10/07/98 10:53a Dave
47 * 1 10/07/98 10:49a Dave
49 * 14 5/20/98 9:46p John
50 * added code so the places in code that change half the palette don't
51 * have to clear the screen.
53 * 13 5/06/98 5:30p John
54 * Removed unused cfilearchiver. Removed/replaced some unused/little used
55 * graphics functions, namely gradient_h and _v and pixel_sp. Put in new
56 * DirectX header files and libs that fixed the Direct3D alpha blending
59 * 12 4/14/98 12:15p John
60 * Made 16-bpp movies work.
62 * 11 3/12/98 5:36p John
63 * Took out any unused shaders. Made shader code take rgbc instead of
64 * matrix and vector since noone used it like a matrix and it would have
65 * been impossible to do in hardware. Made Glide implement a basic
66 * shader for online help.
68 * 10 3/10/98 4:18p John
69 * Cleaned up graphics lib. Took out most unused gr functions. Made D3D
70 * & Glide have popups and print screen. Took out all >8bpp software
71 * support. Made Fred zbuffer. Made zbuffer allocate dynamically to
72 * support Fred. Made zbuffering key off of functions rather than one
75 * 9 12/02/97 4:00p John
76 * Added first rev of thruster glow, along with variable levels of
77 * translucency, which retquired some restructing of palman.
79 * 8 10/03/97 9:10a John
80 * added better antialiased line drawer
82 * 7 9/23/97 10:45a John
83 * made so you can tell bitblt code to rle a bitmap by passing flag to
86 * 6 9/09/97 11:01a Sandeep
87 * fixed warning level 4 bugs
89 * 5 7/10/97 2:06p John
90 * added code to specify alphablending type for bitmaps.
92 * 4 6/17/97 7:04p John
93 * added d3d support for gradients.
94 * fixed some color bugs by adding screen signatures instead of watching
95 * flags and palette changes.
97 * 3 6/12/97 2:50a Lawrance
98 * bm_unlock() now passed bitmap number, not pointer
100 * 2 6/11/97 1:12p John
101 * Started fixing all the text colors in the game.
103 * 1 5/12/97 12:14p John
110 #include <windowsx.h>
116 #include "floating.h"
118 #include "grinternal.h"
119 #include "gropengl.h"
122 static int Inited = 0;
124 // Throw in some dummy functions - DDOI
125 void gr_opengl_preload_init()
129 void gr_d3d_preload(int x, int y)
133 void gr_opengl_activate( int b)
138 void gr_opengl_pixel(int x, int y)
140 if ( x < gr_screen.clip_left ) return;
141 if ( x > gr_screen.clip_right ) return;
142 if ( y < gr_screen.clip_top ) return;
143 if ( y > gr_screen.clip_bottom ) return;
146 void gr_opengl_clear()
151 void gr_opengl_flip()
155 void gr_opengl_flip_window(uint _hdc, int x, int y, int w, int h )
159 void gr_opengl_set_clip(int x,int y,int w,int h)
161 // check for sanity of parameters
167 if (x >= gr_screen.max_w)
168 x = gr_screen.max_w - 1;
169 if (y >= gr_screen.max_h)
170 y = gr_screen.max_h - 1;
172 if (x + w > gr_screen.max_w)
173 w = gr_screen.max_w - x;
174 if (y + h > gr_screen.max_h)
175 h = gr_screen.max_h - y;
177 if (w > gr_screen.max_w)
179 if (h > gr_screen.max_h)
182 gr_screen.offset_x = x;
183 gr_screen.offset_y = y;
184 gr_screen.clip_left = 0;
185 gr_screen.clip_right = w-1;
186 gr_screen.clip_top = 0;
187 gr_screen.clip_bottom = h-1;
188 gr_screen.clip_width = w;
189 gr_screen.clip_height = h;
192 void gr_opengl_reset_clip()
194 gr_screen.offset_x = 0;
195 gr_screen.offset_y = 0;
196 gr_screen.clip_left = 0;
197 gr_screen.clip_top = 0;
198 gr_screen.clip_right = gr_screen.max_w - 1;
199 gr_screen.clip_bottom = gr_screen.max_h - 1;
200 gr_screen.clip_width = gr_screen.max_w;
201 gr_screen.clip_height = gr_screen.max_h;
204 void gr_opengl_set_font(int fontnum)
208 void gr_opengl_set_color( int r, int g, int b )
210 Assert((r >= 0) && (r < 256));
211 Assert((g >= 0) && (g < 256));
212 Assert((b >= 0) && (b < 256));
214 gr_screen.current_color.red = (unsigned char)r;
215 gr_screen.current_color.green = (unsigned char)g;
216 gr_screen.current_color.blue = (unsigned char)b;
219 void gr_opengl_set_bitmap( int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy )
221 gr_screen.current_alpha = alpha;
222 gr_screen.current_alphablend_mode = alphablend_mode;
223 gr_screen.current_bitblt_mode = bitblt_mode;
224 gr_screen.current_bitmap = bitmap_num;
226 gr_screen.current_bitmap_sx = sx;
227 gr_screen.current_bitmap_sy = sy;
230 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
232 shade->screen_sig = gr_screen.signature;
239 void gr_opengl_set_shader( shader * shade )
242 if (shade->screen_sig != gr_screen.signature) {
243 gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
245 gr_screen.current_shader = *shade;
247 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
252 void gr_opengl_bitmap_ex(int x,int y,int w,int h,int sx,int sy)
258 bmp = bm_lock( gr_screen.current_bitmap, 8, 0 );
259 sptr = (ubyte *)( bmp->data + (sy*bmp->w+sx) );
261 // mprintf(( "x=%d, y=%d, w=%d, h=%d\n", x, y, w, h ));
262 // mprintf(( "sx=%d, sy=%d, bw=%d, bh=%d\n", sx, sy, bmp->w, bmp->h ));
264 for (i=0; i<h; i++ ) {
265 for ( j=0; j<w; j++ ) {
266 gr_set_color( gr_palette[sptr[j]*3+0], gr_palette[sptr[j]*3+1], gr_palette[sptr[j]*3+2] );
267 gr_pixel( x+j, i+y );
271 bm_unlock(gr_screen.current_bitmap);
274 void gr_opengl_bitmap(int x, int y)
278 bm_get_info( gr_screen.current_bitmap, &w, &h, NULL );
279 int dx1=x, dx2=x+w-1;
280 int dy1=y, dy2=y+h-1;
283 if ((dx1 > gr_screen.clip_right ) || (dx2 < gr_screen.clip_left)) return;
284 if ((dy1 > gr_screen.clip_bottom ) || (dy2 < gr_screen.clip_top)) return;
285 if ( dx1 < gr_screen.clip_left ) { sx = gr_screen.clip_left-dx1; dx1 = gr_screen.clip_left; }
286 if ( dy1 < gr_screen.clip_top ) { sy = gr_screen.clip_top-dy1; dy1 = gr_screen.clip_top; }
287 if ( dx2 > gr_screen.clip_right ) { dx2 = gr_screen.clip_right; }
288 if ( dy2 > gr_screen.clip_bottom ) { dy2 = gr_screen.clip_bottom; }
290 if ( sx < 0 ) return;
291 if ( sy < 0 ) return;
292 if ( sx >= w ) return;
293 if ( sy >= h ) return;
295 // Draw bitmap bm[sx,sy] into (dx1,dy1)-(dx2,dy2)
297 gr_bitmap_ex(dx1,dy1,dx2-dx1+1,dy2-dy1+1,sx,sy);
300 static void opengl_scanline(int x1,int x2,int y)
304 void gr_opengl_rect(int x,int y,int w,int h)
339 opengl_scanline( x1, x2, y1+i );
343 void gr_opengl_shade(int x,int y,int w,int h)
347 void opengl_mtext(int x, int y, char *s, int len )
351 void gr_opengl_string(int x,int y,char * text)
358 p = strchr( p1, '\n' );
363 gr_get_string_size( &w, &h, p1 );
366 opengl_mtext(gr_screen.offset_x+(gr_screen.clip_width-w)/2,y+gr_screen.offset_y,p1,strlen(p1));
368 opengl_mtext(gr_screen.offset_x+x,y+gr_screen.offset_y,p1,strlen(p1));
371 if ( p1 && (strlen(p1) < 1) ) p1 = NULL;
379 void gr_opengl_circle( int xc, int yc, int d )
389 if ( (xc+r) < gr_screen.clip_left ) return;
390 if ( (xc-r) > gr_screen.clip_right ) return;
391 if ( (yc+r) < gr_screen.clip_top ) return;
392 if ( (yc-r) > gr_screen.clip_bottom ) return;
395 // Draw the first octant
396 opengl_scanline( xc-y, xc+y, yc-x );
397 opengl_scanline( xc-y, xc+y, yc+x );
402 // Draw the second octant
403 opengl_scanline( xc-x, xc+x, yc-y );
404 opengl_scanline( xc-x, xc+x, yc+y );
411 opengl_scanline( xc-x, xc+x, yc-y );
412 opengl_scanline( xc-x, xc+x, yc+y );
418 void gr_opengl_line(int x1,int y1,int x2,int y2)
425 int clipped = 0, swapped=0;
427 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);
445 for(i=dx+1;i>0;i--) {
457 for(i=dy+1;i>0;i--) {
471 #define FIND_SCALED_NUM(x,x0,x1,y0,y1) (((((x)-(x0))*((y1)-(y0)))/((x1)-(x0)))+(y0))
473 void gr_opengl_scaler(vertex *va, vertex *vb )
475 float x0, y0, x1, y1;
476 float u0, v0, u1, v1;
477 float clipped_x0, clipped_y0, clipped_x1, clipped_y1;
478 float clipped_u0, clipped_v0, clipped_u1, clipped_v1;
479 float xmin, xmax, ymin, ymax;
480 int dx0, dy0, dx1, dy1;
482 //============= CLIP IT =====================
484 x0 = va->sx; y0 = va->sy;
485 x1 = vb->sx; y1 = vb->sy;
487 xmin = i2fl(gr_screen.clip_left); ymin = i2fl(gr_screen.clip_top);
488 xmax = i2fl(gr_screen.clip_right); ymax = i2fl(gr_screen.clip_bottom);
490 u0 = va->u; v0 = va->v;
491 u1 = vb->u; v1 = vb->v;
493 // Check for obviously offscreen bitmaps...
494 if ( (y1<=y0) || (x1<=x0) ) return;
495 if ( (x1<xmin ) || (x0>xmax) ) return;
496 if ( (y1<ymin ) || (y0>ymax) ) return;
498 clipped_u0 = u0; clipped_v0 = v0;
499 clipped_u1 = u1; clipped_v1 = v1;
501 clipped_x0 = x0; clipped_y0 = y0;
502 clipped_x1 = x1; clipped_y1 = y1;
504 // Clip the left, moving u0 right as necessary
506 clipped_u0 = FIND_SCALED_NUM(xmin,x0,x1,u0,u1);
510 // Clip the right, moving u1 left as necessary
512 clipped_u1 = FIND_SCALED_NUM(xmax,x0,x1,u0,u1);
516 // Clip the top, moving v0 down as necessary
518 clipped_v0 = FIND_SCALED_NUM(ymin,y0,y1,v0,v1);
522 // Clip the bottom, moving v1 up as necessary
524 clipped_v1 = FIND_SCALED_NUM(ymax,y0,y1,v0,v1);
528 dx0 = fl2i(clipped_x0); dx1 = fl2i(clipped_x1);
529 dy0 = fl2i(clipped_y0); dy1 = fl2i(clipped_y1);
531 if (dx1<=dx0) return;
532 if (dy1<=dy0) return;
534 //============= DRAW IT =====================
542 tmpu = (clipped_u1-clipped_u0) / (dx1-dx0);
543 if ( fl_abs(tmpu) < 0.001f ) {
544 return; // scaled up way too far!
546 tmpv = (clipped_v1-clipped_v0) / (dy1-dy0);
547 if ( fl_abs(tmpv) < 0.001f ) {
548 return; // scaled up way too far!
551 bp = bm_lock( gr_screen.current_bitmap, 8, 0 );
553 du = fl2f(tmpu*(bp->w-1));
554 dv = fl2f(tmpv*(bp->h-1));
556 v = fl2f(clipped_v0*(bp->h-1));
557 u = fl2f(clipped_u0*(bp->w-1));
560 spixels = (ubyte *)bp->data;
562 for (y=dy0; y<=dy1; y++ ) {
563 sbits = &spixels[bp->rowsize*(v>>16)];
567 for (x=0; x<w; x++ ) {
568 ubyte c = sbits[ tmp_u >> 16 ];
570 gr_set_color( gr_palette[c*3+0], gr_palette[c*3+1], gr_palette[c*3+2] );
571 gr_pixel( x+dx0, y );
578 bm_unlock(gr_screen.current_bitmap);
584 void gr_opengl_tmapper( int nv, vertex * verts[], uint flags )
589 void gr_opengl_gradient(int x1,int y1,int x2,int y2)
593 void gr_opengl_set_palette(ubyte *new_palette, int is_alphacolor)
597 void gr_opengl_get_color( int * r, int * g, int * b )
599 if (r) *r = gr_screen.current_color.red;
600 if (g) *g = gr_screen.current_color.green;
601 if (b) *b = gr_screen.current_color.blue;
604 void gr_opengl_init_color(color *c, int r, int g, int b)
606 gr_screen.current_color.screen_sig = gr_screen.signature;
607 gr_screen.current_color.red = (unsigned char)r;
608 gr_screen.current_color.green = (unsigned char)g;
609 gr_screen.current_color.blue = (unsigned char)b;
612 void gr_opengl_set_color_fast(color *dst)
614 if ( dst->screen_sig != gr_screen.signature ) {
615 gr_init_color( dst, dst->red, dst->green, dst->blue );
618 gr_screen.current_color = *dst;
623 void gr_opengl_print_screen(char *filename)
628 int gr_opengl_supports_res_ingame(int res)
633 int gr_opengl_supports_res_interface(int res)
638 void gr_opengl_cleanup()
640 if ( !Inited ) return;
649 void gr_opengl_fog_set(int fog_mode, int r, int g, int b, float near, float far)
653 void gr_opengl_get_pixel(int x, int y, int *r, int *g, int *b)
657 void gr_opengl_get_region(int front, int w, int g, ubyte *data)
661 void gr_opengl_set_cull(int cull)
665 void gr_opengl_filter_set(int filter)
670 void gr_opengl_cross_fade(int bmap1, int bmap2, int x1, int y1, int x2, int y2, float pct)
674 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)
679 void gr_opengl_set_clear_color(int r, int g, int b)
683 void gr_opengl_init()
690 mprintf(( "Initializing opengl graphics device...\n" ));
695 gr_screen.gf_flip = gr_opengl_flip;
696 gr_screen.gf_flip_window = gr_opengl_flip_window;
697 gr_screen.gf_set_clip = gr_opengl_set_clip;
698 gr_screen.gf_reset_clip = gr_opengl_reset_clip;
699 gr_screen.gf_set_font = gr_opengl_set_font;
700 gr_screen.gf_set_color = gr_opengl_set_color;
701 gr_screen.gf_set_bitmap = gr_opengl_set_bitmap;
702 gr_screen.gf_create_shader = gr_opengl_create_shader;
703 gr_screen.gf_set_shader = gr_opengl_set_shader;
704 gr_screen.gf_clear = gr_opengl_clear;
705 // gr_screen.gf_bitmap = gr_opengl_bitmap;
706 // gr_screen.gf_bitmap_ex = gr_opengl_bitmap_ex;
707 gr_screen.gf_rect = gr_opengl_rect;
708 gr_screen.gf_shade = gr_opengl_shade;
709 gr_screen.gf_string = gr_opengl_string;
710 gr_screen.gf_circle = gr_opengl_circle;
712 gr_screen.gf_line = gr_opengl_line;
713 gr_screen.gf_pixel = gr_opengl_pixel;
714 gr_screen.gf_scaler = gr_opengl_scaler;
715 gr_screen.gf_tmapper = gr_opengl_tmapper;
717 gr_screen.gf_gradient = gr_opengl_gradient;
719 gr_screen.gf_set_palette = gr_opengl_set_palette;
720 gr_screen.gf_get_color = gr_opengl_get_color;
721 gr_screen.gf_init_color = gr_opengl_init_color;
722 gr_screen.gf_set_color_fast = gr_opengl_set_color_fast;
723 gr_screen.gf_print_screen = gr_opengl_print_screen;
725 gr_screen.gf_fog_set = gr_opengl_fog_set;
727 gr_screen.gf_get_region = gr_opengl_get_region;
729 gr_screen.gf_get_pixel = gr_opengl_get_pixel;
731 gr_screen.gf_set_cull = gr_opengl_set_cull;
733 gr_screen.gf_cross_fade = gr_opengl_cross_fade;
735 gr_screen.gf_filter_set = gr_opengl_filter_set;
737 gr_screen.gf_tcache_set = gr_opengl_tcache_set;
739 gr_screen.gf_set_clear_color = gr_opengl_set_clear_color;