6 #define CLIP_XMIN (1<<0) 7 #define CLIP_XMAX (1<<1) 8 #define CLIP_YMIN (1<<2) 9 #define CLIP_YMAX (1<<3) 10 #define CLIP_ZMIN (1<<4) 11 #define CLIP_ZMAX (1<<5) 13 void gl_transform_to_viewport(GLContext *c,GLVertex *v)
19 v->zp.x= (int) ( v->pc.X * winv * c->viewport.scale.X
20 + c->viewport.trans.X );
21 v->zp.y= (int) ( v->pc.Y * winv * c->viewport.scale.Y
22 + c->viewport.trans.Y );
23 v->zp.z= (int) ( v->pc.Z * winv * c->viewport.scale.Z
24 + c->viewport.trans.Z );
26 if (c->lighting_enabled) {
27 v->zp.r=(int)(v->color.v[0] * (ZB_POINT_RED_MAX - ZB_POINT_RED_MIN)
29 v->zp.g=(int)(v->color.v[1] * (ZB_POINT_GREEN_MAX - ZB_POINT_GREEN_MIN)
30 + ZB_POINT_GREEN_MIN);
31 v->zp.b=(int)(v->color.v[2] * (ZB_POINT_BLUE_MAX - ZB_POINT_BLUE_MIN)
35 v->zp.r = c->longcurrent_color[0];
36 v->zp.g = c->longcurrent_color[1];
37 v->zp.b = c->longcurrent_color[2];
42 if (c->texture_2d_enabled) {
43 v->zp.s=(int)(v->tex_coord.X * (ZB_POINT_S_MAX - ZB_POINT_S_MIN)
45 v->zp.t=(int)(v->tex_coord.Y * (ZB_POINT_T_MAX - ZB_POINT_T_MIN)
51 static void gl_add_select1(GLContext *c,
int z1,
int z2,
int z3)
55 if ((
unsigned int)z2<min) min=z2;
56 if ((
unsigned int)z3<min) min=z3;
57 if ((
unsigned int)z2>max) max=z2;
58 if ((
unsigned int)z3>max) max=z3;
60 gl_add_select(c,0xffffffff-min,0xffffffff-max);
65 void gl_draw_point(GLContext *c,GLVertex *p0)
67 if (p0->clip_code == 0) {
68 if (c->render_mode == GL_SELECT) {
69 gl_add_select(c,p0->zp.z,p0->zp.z);
71 ZB_plot(c->zb,&p0->zp);
78 static inline void line_interpolate(GLVertex *q,GLVertex *p0,GLVertex *p1,
float t)
80 q->pc.X=p0->pc.X+(p1->pc.X-p0->pc.X)*t;
81 q->pc.Y=p0->pc.Y+(p1->pc.Y-p0->pc.Y)*t;
82 q->pc.Z=p0->pc.Z+(p1->pc.Z-p0->pc.Z)*t;
83 q->pc.W=p0->pc.W+(p1->pc.W-p0->pc.W)*t;
85 q->color.v[0]=p0->color.v[0] + (p1->color.v[0]-p0->color.v[0])*t;
86 q->color.v[1]=p0->color.v[1] + (p1->color.v[1]-p0->color.v[1])*t;
87 q->color.v[2]=p0->color.v[2] + (p1->color.v[2]-p0->color.v[2])*t;
96 static inline int ClipLine1(
float denom,
float num,
float *tmin,
float *tmax)
102 if (t>*tmax)
return 0;
103 if (t>*tmin) *tmin=t;
104 }
else if (denom<0) {
106 if (t<*tmin)
return 0;
107 if (t<*tmax) *tmax=t;
108 }
else if (num>0)
return 0;
112 void gl_draw_line(GLContext *c,GLVertex *p1,GLVertex *p2)
114 float dx,dy,dz,dw,x1,y1,z1,w1;
122 if ( (cc1 | cc2) == 0) {
123 if (c->render_mode == GL_SELECT) {
124 gl_add_select1(c,p1->zp.z,p2->zp.z,p2->zp.z);
127 ZB_line_z(c->zb,&p1->zp,&p2->zp);
129 ZB_line(c->zb,&p1->zp,&p2->zp);
131 }
else if ( (cc1&cc2) != 0 ) {
134 dx=p2->pc.X-p1->pc.X;
135 dy=p2->pc.Y-p1->pc.Y;
136 dz=p2->pc.Z-p1->pc.Z;
137 dw=p2->pc.W-p1->pc.W;
145 if (ClipLine1(dx+dw,-x1-w1,&tmin,&tmax) &&
146 ClipLine1(-dx+dw,x1-w1,&tmin,&tmax) &&
147 ClipLine1(dy+dw,-y1-w1,&tmin,&tmax) &&
148 ClipLine1(-dy+dw,y1-w1,&tmin,&tmax) &&
149 ClipLine1(dz+dw,-z1-w1,&tmin,&tmax) &&
150 ClipLine1(-dz+dw,z1-w1,&tmin,&tmax)) {
152 line_interpolate(&q1,p1,p2,tmin);
153 line_interpolate(&q2,p1,p2,tmax);
154 gl_transform_to_viewport(c,&q1);
155 gl_transform_to_viewport(c,&q2);
158 ZB_line_z(c->zb,&q1.zp,&q2.zp);
160 ZB_line(c->zb,&q1.zp,&q2.zp);
177 #define clip_func(name,sign,dir,dir1,dir2) \ 178 static float name(V4 *c,V4 *a,V4 *b) \ 180 float t,dX,dY,dZ,dW,den;\ 185 den = -(sign d ## dir) + dW;\ 187 else t = ( sign a->dir - a->W) / den;\ 188 c->dir1 = a->dir1 + t * d ## dir1;\ 189 c->dir2 = a->dir2 + t * d ## dir2;\ 190 c->W = a->W + t * dW;\ 196 clip_func(clip_xmin,-,X,Y,Z)
198 clip_func(clip_xmax,+,X,Y,Z)
200 clip_func(clip_ymin,-,Y,X,Z)
202 clip_func(clip_ymax,+,Y,X,Z)
204 clip_func(clip_zmin,-,Z,X,Y)
206 clip_func(clip_zmax,+,Z,X,Y)
209 float (*clip_proc[6])(V4 *,V4 *,V4 *)= {
215 static inline void updateTmp(GLContext *c,
216 GLVertex *q,GLVertex *p0,GLVertex *p1,
float t)
218 if (c->current_shade_model == GL_SMOOTH) {
219 q->color.v[0]=p0->color.v[0] + (p1->color.v[0]-p0->color.v[0])*t;
220 q->color.v[1]=p0->color.v[1] + (p1->color.v[1]-p0->color.v[1])*t;
221 q->color.v[2]=p0->color.v[2] + (p1->color.v[2]-p0->color.v[2])*t;
223 q->color.v[0]=p0->color.v[0];
224 q->color.v[1]=p0->color.v[1];
225 q->color.v[2]=p0->color.v[2];
228 if (c->texture_2d_enabled) {
229 q->tex_coord.X=p0->tex_coord.X + (p1->tex_coord.X-p0->tex_coord.X)*t;
230 q->tex_coord.Y=p0->tex_coord.Y + (p1->tex_coord.Y-p0->tex_coord.Y)*t;
233 q->clip_code=gl_clipcode(q->pc.X,q->pc.Y,q->pc.Z,q->pc.W);
235 gl_transform_to_viewport(c,q);
238 static void gl_draw_triangle_clip(GLContext *c,
239 GLVertex *p0,GLVertex *p1,GLVertex *p2,
int clip_bit);
241 void gl_draw_triangle(GLContext *c,
242 GLVertex *p0,GLVertex *p1,GLVertex *p2)
244 int co,c_and,cc[3],front;
251 co=cc[0] | cc[1] | cc[2];
256 norm=(float)(p1->zp.x-p0->zp.x)*(float)(p2->zp.y-p0->zp.y)-
257 (float)(p2->zp.x-p0->zp.x)*(float)(p1->zp.y-p0->zp.y);
259 if (norm == 0)
return;
262 front = front ^ c->current_front_face;
265 if (c->cull_face_enabled) {
267 if (c->current_cull_face == GL_BACK) {
268 if (front == 0)
return;
269 c->draw_triangle_front(c,p0,p1,p2);
270 }
else if (c->current_cull_face == GL_FRONT) {
271 if (front != 0)
return;
272 c->draw_triangle_back(c,p0,p1,p2);
279 c->draw_triangle_front(c,p0,p1,p2);
281 c->draw_triangle_back(c,p0,p1,p2);
285 c_and=cc[0] & cc[1] & cc[2];
287 gl_draw_triangle_clip(c,p0,p1,p2,0);
292 static void gl_draw_triangle_clip(GLContext *c,
293 GLVertex *p0,GLVertex *p1,GLVertex *p2,
int clip_bit)
295 int co,c_and,co1,cc[3],edge_flag_tmp,clip_mask;
296 GLVertex tmp1,tmp2,*q[3];
303 co=cc[0] | cc[1] | cc[2];
305 gl_draw_triangle(c,p0,p1,p2);
307 c_and=cc[0] & cc[1] & cc[2];
309 if (c_and!=0)
return;
312 while (clip_bit < 6 && (co & (1 << clip_bit)) == 0) {
320 printf(
"%f %f %f %f\n",p0->pc.X,p0->pc.Y,p0->pc.Z,p0->pc.W);
321 printf(
"%f %f %f %f\n",p1->pc.X,p1->pc.Y,p1->pc.Z,p1->pc.W);
322 printf(
"%f %f %f %f\n",p2->pc.X,p2->pc.Y,p2->pc.Z,p2->pc.W);
327 clip_mask = 1 << clip_bit;
328 co1=(cc[0] ^ cc[1] ^ cc[2]) & clip_mask;
333 if (cc[0] & clip_mask) { q[0]=p0; q[1]=p1; q[2]=p2; }
334 else if (cc[1] & clip_mask) { q[0]=p1; q[1]=p2; q[2]=p0; }
335 else { q[0]=p2; q[1]=p0; q[2]=p1; }
337 tt=clip_proc[clip_bit](&tmp1.pc,&q[0]->pc,&q[1]->pc);
338 updateTmp(c,&tmp1,q[0],q[1],tt);
340 tt=clip_proc[clip_bit](&tmp2.pc,&q[0]->pc,&q[2]->pc);
341 updateTmp(c,&tmp2,q[0],q[2],tt);
343 tmp1.edge_flag=q[0]->edge_flag;
344 edge_flag_tmp=q[2]->edge_flag;
346 gl_draw_triangle_clip(c,&tmp1,q[1],q[2],clip_bit+1);
350 q[2]->edge_flag=edge_flag_tmp;
351 gl_draw_triangle_clip(c,&tmp2,&tmp1,q[2],clip_bit+1);
355 if ((cc[0] & clip_mask)==0) { q[0]=p0; q[1]=p1; q[2]=p2; }
356 else if ((cc[1] & clip_mask)==0) { q[0]=p1; q[1]=p2; q[2]=p0; }
357 else { q[0]=p2; q[1]=p0; q[2]=p1; }
359 tt=clip_proc[clip_bit](&tmp1.pc,&q[0]->pc,&q[1]->pc);
360 updateTmp(c,&tmp1,q[0],q[1],tt);
362 tt=clip_proc[clip_bit](&tmp2.pc,&q[0]->pc,&q[2]->pc);
363 updateTmp(c,&tmp2,q[0],q[2],tt);
366 tmp2.edge_flag=q[2]->edge_flag;
367 gl_draw_triangle_clip(c,q[0],&tmp1,&tmp2,clip_bit+1);
373 void gl_draw_triangle_select(GLContext *c,
374 GLVertex *p0,GLVertex *p1,GLVertex *p2)
376 gl_add_select1(c,p0->zp.z,p1->zp.z,p2->zp.z);
380 int count_triangles,count_triangles_textured,count_pixels;
383 void gl_draw_triangle_fill(GLContext *c,
384 GLVertex *p0,GLVertex *p1,GLVertex *p2)
389 gl_assert(p0->zp.x >= 0 && p0->zp.x < c->zb->xsize);
390 gl_assert(p0->zp.y >= 0 && p0->zp.y < c->zb->ysize);
391 gl_assert(p1->zp.x >= 0 && p1->zp.x < c->zb->xsize);
392 gl_assert(p1->zp.y >= 0 && p1->zp.y < c->zb->ysize);
393 gl_assert(p2->zp.x >= 0 && p2->zp.x < c->zb->xsize);
394 gl_assert(p2->zp.y >= 0 && p2->zp.y < c->zb->ysize);
396 norm=(p1->zp.x-p0->zp.x)*(p2->zp.y-p0->zp.y)-
397 (p2->zp.x-p0->zp.x)*(p1->zp.y-p0->zp.y);
398 count_pixels+=abs(norm)/2;
403 if (c->texture_2d_enabled) {
405 count_triangles_textured++;
407 ZB_setTexture(c->zb,c->current_texture->images[0].pixmap);
408 ZB_fillTriangleMappingPerspective(c->zb,&p0->zp,&p1->zp,&p2->zp);
409 }
else if (c->current_shade_model == GL_SMOOTH) {
410 ZB_fillTriangleSmooth(c->zb,&p0->zp,&p1->zp,&p2->zp);
412 ZB_fillTriangleFlat(c->zb,&p0->zp,&p1->zp,&p2->zp);
418 void gl_draw_triangle_line(GLContext *c,
419 GLVertex *p0,GLVertex *p1,GLVertex *p2)
422 if (p0->edge_flag) ZB_line_z(c->zb,&p0->zp,&p1->zp);
423 if (p1->edge_flag) ZB_line_z(c->zb,&p1->zp,&p2->zp);
424 if (p2->edge_flag) ZB_line_z(c->zb,&p2->zp,&p0->zp);
426 if (p0->edge_flag) ZB_line(c->zb,&p0->zp,&p1->zp);
427 if (p1->edge_flag) ZB_line(c->zb,&p1->zp,&p2->zp);
428 if (p2->edge_flag) ZB_line(c->zb,&p2->zp,&p0->zp);
435 void gl_draw_triangle_point(GLContext *c,
436 GLVertex *p0,GLVertex *p1,GLVertex *p2)
438 if (p0->edge_flag) ZB_plot(c->zb,&p0->zp);
439 if (p1->edge_flag) ZB_plot(c->zb,&p1->zp);
440 if (p2->edge_flag) ZB_plot(c->zb,&p2->zp);