2 * $Logfile: /Freespace2/code/Graphics/GrOpenGL.cpp $
7 * Code that uses the OpenGL graphics library
10 * Revision 1.7 2002/05/29 02:52:32 theoddone33
11 * Enable OpenGL renderer
13 * Revision 1.6 2002/05/28 04:56:51 theoddone33
14 * runs a little bit now
16 * Revision 1.5 2002/05/28 04:07:28 theoddone33
17 * New graphics stubbing arrangement
19 * Revision 1.4 2002/05/27 23:39:34 relnev
22 * Revision 1.3 2002/05/27 22:35:01 theoddone33
25 * Revision 1.2 2002/05/27 22:32:02 theoddone33
26 * throw all d3d stuff at opengl
28 * Revision 1.1.1.1 2002/05/03 03:28:09 root
32 * 10 7/14/99 9:42a Dave
33 * Put in clear_color debug function. Put in base for 3dnow stuff / P3
36 * 9 7/09/99 9:51a Dave
37 * Added thick polyline code.
39 * 8 6/29/99 10:35a Dave
40 * Interface polygon bitmaps! Whee!
42 * 7 2/03/99 11:44a Dave
43 * Fixed d3d transparent textures.
45 * 6 1/24/99 11:37p Dave
46 * First full rev of beam weapons. Very customizable. Removed some bogus
47 * Int3()'s in low level net code.
49 * 5 12/18/98 1:13a Dave
50 * Rough 1024x768 support for Direct3D. Proper detection and usage through
53 * 4 12/06/98 2:36p Dave
54 * Drastically improved nebula fogging.
56 * 3 11/11/98 5:37p Dave
57 * Checkin for multiplayer testing.
59 * 2 10/07/98 10:53a Dave
62 * 1 10/07/98 10:49a Dave
64 * 14 5/20/98 9:46p John
65 * added code so the places in code that change half the palette don't
66 * have to clear the screen.
68 * 13 5/06/98 5:30p John
69 * Removed unused cfilearchiver. Removed/replaced some unused/little used
70 * graphics functions, namely gradient_h and _v and pixel_sp. Put in new
71 * DirectX header files and libs that fixed the Direct3D alpha blending
74 * 12 4/14/98 12:15p John
75 * Made 16-bpp movies work.
77 * 11 3/12/98 5:36p John
78 * Took out any unused shaders. Made shader code take rgbc instead of
79 * matrix and vector since noone used it like a matrix and it would have
80 * been impossible to do in hardware. Made Glide implement a basic
81 * shader for online help.
83 * 10 3/10/98 4:18p John
84 * Cleaned up graphics lib. Took out most unused gr functions. Made D3D
85 * & Glide have popups and print screen. Took out all >8bpp software
86 * support. Made Fred zbuffer. Made zbuffer allocate dynamically to
87 * support Fred. Made zbuffering key off of functions rather than one
90 * 9 12/02/97 4:00p John
91 * Added first rev of thruster glow, along with variable levels of
92 * translucency, which retquired some restructing of palman.
94 * 8 10/03/97 9:10a John
95 * added better antialiased line drawer
97 * 7 9/23/97 10:45a John
98 * made so you can tell bitblt code to rle a bitmap by passing flag to
101 * 6 9/09/97 11:01a Sandeep
102 * fixed warning level 4 bugs
104 * 5 7/10/97 2:06p John
105 * added code to specify alphablending type for bitmaps.
107 * 4 6/17/97 7:04p John
108 * added d3d support for gradients.
109 * fixed some color bugs by adding screen signatures instead of watching
110 * flags and palette changes.
112 * 3 6/12/97 2:50a Lawrance
113 * bm_unlock() now passed bitmap number, not pointer
115 * 2 6/11/97 1:12p John
116 * Started fixing all the text colors in the game.
118 * 1 5/12/97 12:14p John
125 #include <windowsx.h>
131 #include "floating.h"
133 #include "grinternal.h"
134 #include "gropengl.h"
137 static int Inited = 0;
139 // Throw in some dummy functions - DDOI
141 int D3D_32bit = 0; // grd3d.cpp
142 int D3D_fog_mode = -1; // grd3d.cpp
143 int D3D_inited = 0; // grd3d.cpp
144 int D3D_zbias = 1; // grd3d.cpp
145 int D3d_rendition_uvs = 0; // grd3d.cpp
147 void gr_dd_activate(int active) // grdirectdraw.cpp
152 void gr_directdraw_cleanup() // grdirectdraw.cpp
157 void gr_directdraw_force_windowed() // grdirectdraw.cpp
162 void gr_directdraw_init()
167 void gr_opengl_preload_init()
172 void gr_d3d_preload(int x, int y)
177 void gr_opengl_activate(int b)
182 void d3d_start_frame()
187 void d3d_stop_frame()
197 void d3d_zbias (int a)
203 void gr_opengl_pixel(int x, int y)
205 if ( x < gr_screen.clip_left ) return;
206 if ( x > gr_screen.clip_right ) return;
207 if ( y < gr_screen.clip_top ) return;
208 if ( y > gr_screen.clip_bottom ) return;
211 void gr_opengl_clear()
216 void gr_opengl_flip()
219 if (Inited) SDL_GL_SwapBuffers ();
223 void gr_opengl_flip_window(uint _hdc, int x, int y, int w, int h )
227 void gr_opengl_set_clip(int x,int y,int w,int h)
229 // check for sanity of parameters
235 if (x >= gr_screen.max_w)
236 x = gr_screen.max_w - 1;
237 if (y >= gr_screen.max_h)
238 y = gr_screen.max_h - 1;
240 if (x + w > gr_screen.max_w)
241 w = gr_screen.max_w - x;
242 if (y + h > gr_screen.max_h)
243 h = gr_screen.max_h - y;
245 if (w > gr_screen.max_w)
247 if (h > gr_screen.max_h)
250 gr_screen.offset_x = x;
251 gr_screen.offset_y = y;
252 gr_screen.clip_left = 0;
253 gr_screen.clip_right = w-1;
254 gr_screen.clip_top = 0;
255 gr_screen.clip_bottom = h-1;
256 gr_screen.clip_width = w;
257 gr_screen.clip_height = h;
260 void gr_opengl_reset_clip()
262 gr_screen.offset_x = 0;
263 gr_screen.offset_y = 0;
264 gr_screen.clip_left = 0;
265 gr_screen.clip_top = 0;
266 gr_screen.clip_right = gr_screen.max_w - 1;
267 gr_screen.clip_bottom = gr_screen.max_h - 1;
268 gr_screen.clip_width = gr_screen.max_w;
269 gr_screen.clip_height = gr_screen.max_h;
272 void gr_opengl_set_font(int fontnum)
276 void gr_opengl_set_color( int r, int g, int b )
278 Assert((r >= 0) && (r < 256));
279 Assert((g >= 0) && (g < 256));
280 Assert((b >= 0) && (b < 256));
282 gr_screen.current_color.red = (unsigned char)r;
283 gr_screen.current_color.green = (unsigned char)g;
284 gr_screen.current_color.blue = (unsigned char)b;
287 void gr_opengl_set_bitmap( int bitmap_num, int alphablend_mode, int bitblt_mode, float alpha, int sx, int sy )
289 gr_screen.current_alpha = alpha;
290 gr_screen.current_alphablend_mode = alphablend_mode;
291 gr_screen.current_bitblt_mode = bitblt_mode;
292 gr_screen.current_bitmap = bitmap_num;
294 gr_screen.current_bitmap_sx = sx;
295 gr_screen.current_bitmap_sy = sy;
298 void gr_opengl_create_shader(shader * shade, float r, float g, float b, float c )
300 shade->screen_sig = gr_screen.signature;
307 void gr_opengl_set_shader( shader * shade )
310 if (shade->screen_sig != gr_screen.signature) {
311 gr_create_shader( shade, shade->r, shade->g, shade->b, shade->c );
313 gr_screen.current_shader = *shade;
315 gr_create_shader( &gr_screen.current_shader, 0.0f, 0.0f, 0.0f, 0.0f );
320 void gr_opengl_bitmap_ex(int x,int y,int w,int h,int sx,int sy)
326 bmp = bm_lock( gr_screen.current_bitmap, 8, 0 );
327 sptr = (ubyte *)( bmp->data + (sy*bmp->w+sx) );
329 // mprintf(( "x=%d, y=%d, w=%d, h=%d\n", x, y, w, h ));
330 // mprintf(( "sx=%d, sy=%d, bw=%d, bh=%d\n", sx, sy, bmp->w, bmp->h ));
332 for (i=0; i<h; i++ ) {
333 for ( j=0; j<w; j++ ) {
334 gr_set_color( gr_palette[sptr[j]*3+0], gr_palette[sptr[j]*3+1], gr_palette[sptr[j]*3+2] );
335 gr_pixel( x+j, i+y );
339 bm_unlock(gr_screen.current_bitmap);
342 void gr_opengl_bitmap(int x, int y)
346 bm_get_info( gr_screen.current_bitmap, &w, &h, NULL );
347 int dx1=x, dx2=x+w-1;
348 int dy1=y, dy2=y+h-1;
351 if ((dx1 > gr_screen.clip_right ) || (dx2 < gr_screen.clip_left)) return;
352 if ((dy1 > gr_screen.clip_bottom ) || (dy2 < gr_screen.clip_top)) return;
353 if ( dx1 < gr_screen.clip_left ) { sx = gr_screen.clip_left-dx1; dx1 = gr_screen.clip_left; }
354 if ( dy1 < gr_screen.clip_top ) { sy = gr_screen.clip_top-dy1; dy1 = gr_screen.clip_top; }
355 if ( dx2 > gr_screen.clip_right ) { dx2 = gr_screen.clip_right; }
356 if ( dy2 > gr_screen.clip_bottom ) { dy2 = gr_screen.clip_bottom; }
358 if ( sx < 0 ) return;
359 if ( sy < 0 ) return;
360 if ( sx >= w ) return;
361 if ( sy >= h ) return;
363 // Draw bitmap bm[sx,sy] into (dx1,dy1)-(dx2,dy2)
365 gr_bitmap_ex(dx1,dy1,dx2-dx1+1,dy2-dy1+1,sx,sy);
368 static void opengl_scanline(int x1,int x2,int y)
372 void gr_opengl_rect(int x,int y,int w,int h)
407 opengl_scanline( x1, x2, y1+i );
411 void gr_opengl_shade(int x,int y,int w,int h)
415 void opengl_mtext(int x, int y, char *s, int len )
419 void gr_opengl_string(int x,int y,char * text)
426 p = strchr( p1, '\n' );
431 gr_get_string_size( &w, &h, p1 );
434 opengl_mtext(gr_screen.offset_x+(gr_screen.clip_width-w)/2,y+gr_screen.offset_y,p1,strlen(p1));
436 opengl_mtext(gr_screen.offset_x+x,y+gr_screen.offset_y,p1,strlen(p1));
439 if ( p1 && (strlen(p1) < 1) ) p1 = NULL;
447 void gr_opengl_circle( int xc, int yc, int d )
457 if ( (xc+r) < gr_screen.clip_left ) return;
458 if ( (xc-r) > gr_screen.clip_right ) return;
459 if ( (yc+r) < gr_screen.clip_top ) return;
460 if ( (yc-r) > gr_screen.clip_bottom ) return;
463 // Draw the first octant
464 opengl_scanline( xc-y, xc+y, yc-x );
465 opengl_scanline( xc-y, xc+y, yc+x );
470 // Draw the second octant
471 opengl_scanline( xc-x, xc+x, yc-y );
472 opengl_scanline( xc-x, xc+x, yc+y );
479 opengl_scanline( xc-x, xc+x, yc-y );
480 opengl_scanline( xc-x, xc+x, yc+y );
486 void gr_opengl_line(int x1,int y1,int x2,int y2)
493 int clipped = 0, swapped=0;
495 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);
513 for(i=dx+1;i>0;i--) {
525 for(i=dy+1;i>0;i--) {
539 #define FIND_SCALED_NUM(x,x0,x1,y0,y1) (((((x)-(x0))*((y1)-(y0)))/((x1)-(x0)))+(y0))
541 void gr_opengl_scaler(vertex *va, vertex *vb )
543 float x0, y0, x1, y1;
544 float u0, v0, u1, v1;
545 float clipped_x0, clipped_y0, clipped_x1, clipped_y1;
546 float clipped_u0, clipped_v0, clipped_u1, clipped_v1;
547 float xmin, xmax, ymin, ymax;
548 int dx0, dy0, dx1, dy1;
550 //============= CLIP IT =====================
552 x0 = va->sx; y0 = va->sy;
553 x1 = vb->sx; y1 = vb->sy;
555 xmin = i2fl(gr_screen.clip_left); ymin = i2fl(gr_screen.clip_top);
556 xmax = i2fl(gr_screen.clip_right); ymax = i2fl(gr_screen.clip_bottom);
558 u0 = va->u; v0 = va->v;
559 u1 = vb->u; v1 = vb->v;
561 // Check for obviously offscreen bitmaps...
562 if ( (y1<=y0) || (x1<=x0) ) return;
563 if ( (x1<xmin ) || (x0>xmax) ) return;
564 if ( (y1<ymin ) || (y0>ymax) ) return;
566 clipped_u0 = u0; clipped_v0 = v0;
567 clipped_u1 = u1; clipped_v1 = v1;
569 clipped_x0 = x0; clipped_y0 = y0;
570 clipped_x1 = x1; clipped_y1 = y1;
572 // Clip the left, moving u0 right as necessary
574 clipped_u0 = FIND_SCALED_NUM(xmin,x0,x1,u0,u1);
578 // Clip the right, moving u1 left as necessary
580 clipped_u1 = FIND_SCALED_NUM(xmax,x0,x1,u0,u1);
584 // Clip the top, moving v0 down as necessary
586 clipped_v0 = FIND_SCALED_NUM(ymin,y0,y1,v0,v1);
590 // Clip the bottom, moving v1 up as necessary
592 clipped_v1 = FIND_SCALED_NUM(ymax,y0,y1,v0,v1);
596 dx0 = fl2i(clipped_x0); dx1 = fl2i(clipped_x1);
597 dy0 = fl2i(clipped_y0); dy1 = fl2i(clipped_y1);
599 if (dx1<=dx0) return;
600 if (dy1<=dy0) return;
602 //============= DRAW IT =====================
610 tmpu = (clipped_u1-clipped_u0) / (dx1-dx0);
611 if ( fl_abs(tmpu) < 0.001f ) {
612 return; // scaled up way too far!
614 tmpv = (clipped_v1-clipped_v0) / (dy1-dy0);
615 if ( fl_abs(tmpv) < 0.001f ) {
616 return; // scaled up way too far!
619 bp = bm_lock( gr_screen.current_bitmap, 8, 0 );
621 du = fl2f(tmpu*(bp->w-1));
622 dv = fl2f(tmpv*(bp->h-1));
624 v = fl2f(clipped_v0*(bp->h-1));
625 u = fl2f(clipped_u0*(bp->w-1));
628 spixels = (ubyte *)bp->data;
630 for (y=dy0; y<=dy1; y++ ) {
631 sbits = &spixels[bp->rowsize*(v>>16)];
635 for (x=0; x<w; x++ ) {
636 ubyte c = sbits[ tmp_u >> 16 ];
638 gr_set_color( gr_palette[c*3+0], gr_palette[c*3+1], gr_palette[c*3+2] );
639 gr_pixel( x+dx0, y );
646 bm_unlock(gr_screen.current_bitmap);
652 void gr_opengl_tmapper( int nv, vertex * verts[], uint flags )
657 void gr_opengl_gradient(int x1,int y1,int x2,int y2)
661 void gr_opengl_set_palette(ubyte *new_palette, int is_alphacolor)
665 void gr_opengl_get_color( int * r, int * g, int * b )
667 if (r) *r = gr_screen.current_color.red;
668 if (g) *g = gr_screen.current_color.green;
669 if (b) *b = gr_screen.current_color.blue;
672 void gr_opengl_init_color(color *c, int r, int g, int b)
674 gr_screen.current_color.screen_sig = gr_screen.signature;
675 gr_screen.current_color.red = (unsigned char)r;
676 gr_screen.current_color.green = (unsigned char)g;
677 gr_screen.current_color.blue = (unsigned char)b;
680 void gr_opengl_set_color_fast(color *dst)
682 if ( dst->screen_sig != gr_screen.signature ) {
683 gr_init_color( dst, dst->red, dst->green, dst->blue );
686 gr_screen.current_color = *dst;
691 void gr_opengl_print_screen(char *filename)
696 int gr_opengl_supports_res_ingame(int res)
701 int gr_opengl_supports_res_interface(int res)
706 void gr_opengl_cleanup()
708 if ( !Inited ) return;
717 void gr_opengl_fog_set(int fog_mode, int r, int g, int b, float near, float far)
721 void gr_opengl_get_pixel(int x, int y, int *r, int *g, int *b)
725 void gr_opengl_get_region(int front, int w, int g, ubyte *data)
729 void gr_opengl_set_cull(int cull)
733 void gr_opengl_filter_set(int filter)
738 void gr_opengl_cross_fade(int bmap1, int bmap2, int x1, int y1, int x2, int y2, float pct)
742 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)
747 void gr_opengl_set_clear_color(int r, int g, int b)
751 void gr_opengl_init()
758 mprintf(( "Initializing opengl graphics device...\n" ));
762 if (SDL_InitSubSystem (SDL_INIT_VIDEO) < 0)
764 fprintf (stderr, "Couldn't init SDL: %s", SDL_GetError());
770 if (SDL_SetVideoMode (640, 480, 16, SDL_OPENGL) == NULL)
772 fprintf (stderr, "Couldn't set video mode: %s", SDL_GetError ());
778 gr_screen.gf_flip = gr_opengl_flip;
779 gr_screen.gf_flip_window = gr_opengl_flip_window;
780 gr_screen.gf_set_clip = gr_opengl_set_clip;
781 gr_screen.gf_reset_clip = gr_opengl_reset_clip;
782 gr_screen.gf_set_font = gr_opengl_set_font;
783 gr_screen.gf_set_color = gr_opengl_set_color;
784 gr_screen.gf_set_bitmap = gr_opengl_set_bitmap;
785 gr_screen.gf_create_shader = gr_opengl_create_shader;
786 gr_screen.gf_set_shader = gr_opengl_set_shader;
787 gr_screen.gf_clear = gr_opengl_clear;
788 // gr_screen.gf_bitmap = gr_opengl_bitmap;
789 // gr_screen.gf_bitmap_ex = gr_opengl_bitmap_ex;
790 gr_screen.gf_rect = gr_opengl_rect;
791 gr_screen.gf_shade = gr_opengl_shade;
792 gr_screen.gf_string = gr_opengl_string;
793 gr_screen.gf_circle = gr_opengl_circle;
795 gr_screen.gf_line = gr_opengl_line;
796 gr_screen.gf_pixel = gr_opengl_pixel;
797 gr_screen.gf_scaler = gr_opengl_scaler;
798 gr_screen.gf_tmapper = gr_opengl_tmapper;
800 gr_screen.gf_gradient = gr_opengl_gradient;
802 gr_screen.gf_set_palette = gr_opengl_set_palette;
803 gr_screen.gf_get_color = gr_opengl_get_color;
804 gr_screen.gf_init_color = gr_opengl_init_color;
805 gr_screen.gf_set_color_fast = gr_opengl_set_color_fast;
806 gr_screen.gf_print_screen = gr_opengl_print_screen;
808 gr_screen.gf_fog_set = gr_opengl_fog_set;
810 gr_screen.gf_get_region = gr_opengl_get_region;
812 gr_screen.gf_get_pixel = gr_opengl_get_pixel;
814 gr_screen.gf_set_cull = gr_opengl_set_cull;
816 gr_screen.gf_cross_fade = gr_opengl_cross_fade;
818 gr_screen.gf_filter_set = gr_opengl_filter_set;
820 gr_screen.gf_tcache_set = gr_opengl_tcache_set;
822 gr_screen.gf_set_clear_color = gr_opengl_set_clear_color;