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source: trunk/sys/TinyGL/src/ztriangle.c @ 50

Last change on this file since 50 was 1, checked in by alain, 8 years ago
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File size: 7.8 KB

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1	#include <stdlib.h>
2	#include "zbuffer.h"
3
4	#define ZCMP(z,zpix) ((z) >= (zpix))
5
6	void ZB_fillTriangleFlat(ZBuffer *zb,
7	ZBufferPoint p0,ZBufferPoint p1,ZBufferPoint *p2)
8	{
9	#if TGL_FEATURE_RENDER_BITS == 24
10	unsigned char colorR, colorG, colorB;
11	#else
12	int color;
13	#endif
14
15	#define INTERP_Z
16
17	#if TGL_FEATURE_RENDER_BITS == 24
18
19	#define DRAW_INIT() \
20	{ \
21	colorR=p2->r>>8; \
22	colorG=p2->g>>8; \
23	colorB=p2->b>>8; \
24	}
25
26	#define PUT_PIXEL(_a) \
27	{ \
28	zz=z >> ZB_POINT_Z_FRAC_BITS; \
29	if (ZCMP(zz,pz[_a])) { \
30	pp[3 * _a]=colorR;\
31	pp[3 * _a + 1]=colorG;\
32	pp[3 * _a + 2]=colorB;\
33	pz[_a]=zz; \
34	}\
35	z+=dzdx; \
36	}
37
38	#else
39
40	#define DRAW_INIT() \
41	{ \
42	color=RGB_TO_PIXEL(p2->r,p2->g,p2->b); \
43	}
44
45	#define PUT_PIXEL(_a) \
46	{ \
47	zz=z >> ZB_POINT_Z_FRAC_BITS; \
48	if (ZCMP(zz,pz[_a])) { \
49	pp[_a]=color; \
50	pz[_a]=zz; \
51	} \
52	z+=dzdx; \
53	}
54	#endif /* TGL_FEATURE_RENDER_BITS == 24 */
55
56	#include "ztriangle.h"
57	}
58
59	/*
60	* Smooth filled triangle.
61	* The code below is very tricky :)
62	*/
63
64	void ZB_fillTriangleSmooth(ZBuffer *zb,
65	ZBufferPoint p0,ZBufferPoint p1,ZBufferPoint *p2)
66	{
67	#if TGL_FEATURE_RENDER_BITS == 16
68	int _drgbdx;
69	#endif
70
71	#define INTERP_Z
72	#define INTERP_RGB
73
74	#define SAR_RND_TO_ZERO(v,n) (v / (1<<n))
75
76	#if TGL_FEATURE_RENDER_BITS == 24
77
78	#define DRAW_INIT() \
79	{ \
80	}
81
82	#define PUT_PIXEL(_a) \
83	{ \
84	zz=z >> ZB_POINT_Z_FRAC_BITS; \
85	if (ZCMP(zz,pz[_a])) { \
86	pp[3 * _a]=or1 >> 8;\
87	pp[3 * _a + 1]=og1 >> 8;\
88	pp[3 * _a + 2]=ob1 >> 8;\
89	pz[_a]=zz; \
90	}\
91	z+=dzdx; \
92	og1+=dgdx; \
93	or1+=drdx; \
94	ob1+=dbdx; \
95	}
96
97	#elif TGL_FEATURE_RENDER_BITS == 16
98
99	#define DRAW_INIT() \
100	{ \
101	_drgbdx=(SAR_RND_TO_ZERO(drdx,6) << 22) & 0xFFC00000; \
102	_drgbdx\|=SAR_RND_TO_ZERO(dgdx,5) & 0x000007FF; \
103	_drgbdx\|=(SAR_RND_TO_ZERO(dbdx,7) << 12) & 0x001FF000; \
104	}
105
106
107	#define PUT_PIXEL(_a) \
108	{ \
109	zz=z >> ZB_POINT_Z_FRAC_BITS; \
110	if (ZCMP(zz,pz[_a])) { \
111	tmp=rgb & 0xF81F07E0; \
112	pp[_a]=tmp \| (tmp >> 16); \
113	pz[_a]=zz; \
114	} \
115	z+=dzdx; \
116	rgb=(rgb+drgbdx) & ( ~ 0x00200800); \
117	}
118
119	#define DRAW_LINE() \
120	{ \
121	register unsigned short *pz; \
122	register PIXEL *pp; \
123	register unsigned int tmp,z,zz,rgb,drgbdx; \
124	register int n; \
125	n=(x2 >> 16) - x1; \
126	pp=pp1+x1; \
127	pz=pz1+x1; \
128	z=z1; \
129	rgb=(r1 << 16) & 0xFFC00000; \
130	rgb\|=(g1 >> 5) & 0x000007FF; \
131	rgb\|=(b1 << 5) & 0x001FF000; \
132	drgbdx=_drgbdx; \
133	while (n>=3) { \
134	PUT_PIXEL(0); \
135	PUT_PIXEL(1); \
136	PUT_PIXEL(2); \
137	PUT_PIXEL(3); \
138	pz+=4; \
139	pp+=4; \
140	n-=4; \
141	} \
142	while (n>=0) { \
143	PUT_PIXEL(0); \
144	pz+=1; \
145	pp+=1; \
146	n-=1; \
147	} \
148	}
149
150	#else
151
152	#define DRAW_INIT() \
153	{ \
154	}
155
156	#define PUT_PIXEL(_a) \
157	{ \
158	zz=z >> ZB_POINT_Z_FRAC_BITS; \
159	if (ZCMP(zz,pz[_a])) { \
160	pp[_a] = RGB_TO_PIXEL(or1, og1, ob1);\
161	pz[_a]=zz; \
162	}\
163	z+=dzdx; \
164	og1+=dgdx; \
165	or1+=drdx; \
166	ob1+=dbdx; \
167	}
168
169	#endif /* TGL_FEATURE_RENDER_BITS */
170
171	#include "ztriangle.h"
172	}
173
174	void ZB_setTexture(ZBuffer zb,PIXEL texture)
175	{
176	zb->current_texture=texture;
177	}
178
179	void ZB_fillTriangleMapping(ZBuffer *zb,
180	ZBufferPoint p0,ZBufferPoint p1,ZBufferPoint *p2)
181	{
182	PIXEL *texture;
183
184	#define INTERP_Z
185	#define INTERP_ST
186
187	#define DRAW_INIT() \
188	{ \
189	texture=zb->current_texture; \
190	}
191
192	#if TGL_FEATURE_RENDER_BITS == 24
193
194	#define PUT_PIXEL(_a) \
195	{ \
196	unsigned char *ptr;\
197	zz=z >> ZB_POINT_Z_FRAC_BITS; \
198	if (ZCMP(zz,pz[_a])) { \
199	ptr = texture + (((t & 0x3FC00000) \| s) >> 14) * 3; \
200	pp[3 * _a]= ptr[0];\
201	pp[3 * _a + 1]= ptr[1];\
202	pp[3 * _a + 2]= ptr[2];\
203	pz[_a]=zz; \
204	} \
205	z+=dzdx; \
206	s+=dsdx; \
207	t+=dtdx; \
208	}
209
210	#else
211
212	#define PUT_PIXEL(_a) \
213	{ \
214	zz=z >> ZB_POINT_Z_FRAC_BITS; \
215	if (ZCMP(zz,pz[_a])) { \
216	pp[_a]=texture[((t & 0x3FC00000) \| s) >> 14]; \
217	pz[_a]=zz; \
218	} \
219	z+=dzdx; \
220	s+=dsdx; \
221	t+=dtdx; \
222	}
223
224	#endif
225
226	#include "ztriangle.h"
227	}
228
229	/*
230	* Texture mapping with perspective correction.
231	* We use the gradient method to make less divisions.
232	* TODO: pipeline the division
233	*/
234	#if 1
235
236	void ZB_fillTriangleMappingPerspective(ZBuffer *zb,
237	ZBufferPoint p0,ZBufferPoint p1,ZBufferPoint *p2)
238	{
239	PIXEL *texture;
240	float fdzdx,fndzdx,ndszdx,ndtzdx;
241
242	#define INTERP_Z
243	#define INTERP_STZ
244
245	#define NB_INTERP 8
246
247	#define DRAW_INIT() \
248	{ \
249	texture=zb->current_texture;\
250	fdzdx=(float)dzdx;\
251	fndzdx=NB_INTERP * fdzdx;\
252	ndszdx=NB_INTERP * dszdx;\
253	ndtzdx=NB_INTERP * dtzdx;\
254	}
255
256
257	#if TGL_FEATURE_RENDER_BITS == 24
258
259	#define PUT_PIXEL(_a) \
260	{ \
261	unsigned char *ptr;\
262	zz=z >> ZB_POINT_Z_FRAC_BITS; \
263	if (ZCMP(zz,pz[_a])) { \
264	ptr = texture + (((t & 0x3FC00000) \| (s & 0x003FC000)) >> 14) * 3;\
265	pp[3 * _a]= ptr[0];\
266	pp[3 * _a + 1]= ptr[1];\
267	pp[3 * _a + 2]= ptr[2];\
268	pz[_a]=zz; \
269	} \
270	z+=dzdx; \
271	s+=dsdx; \
272	t+=dtdx; \
273	}
274
275	#else
276
277	#define PUT_PIXEL(_a) \
278	{ \
279	zz=z >> ZB_POINT_Z_FRAC_BITS; \
280	if (ZCMP(zz,pz[_a])) { \
281	pp[_a]=(PIXEL )((char *)texture+ \
282	(((t & 0x3FC00000) \| (s & 0x003FC000)) >> (17 - PSZSH)));\
283	pz[_a]=zz; \
284	} \
285	z+=dzdx; \
286	s+=dsdx; \
287	t+=dtdx; \
288	}
289
290	#endif
291
292	#define DRAW_LINE() \
293	{ \
294	register unsigned short *pz; \
295	register PIXEL *pp; \
296	register unsigned int s,t,z,zz; \
297	register int n,dsdx,dtdx; \
298	float sz,tz,fz,zinv; \
299	n=(x2>>16)-x1; \
300	fz=(float)z1;\
301	zinv=1.0 / fz;\
302	pp=(PIXEL )((char )pp1 + x1 * PSZB); \
303	pz=pz1+x1; \
304	z=z1; \
305	sz=sz1;\
306	tz=tz1;\
307	while (n>=(NB_INTERP-1)) { \
308	{\
309	float ss,tt;\
310	ss=(sz * zinv);\
311	tt=(tz * zinv);\
312	s=(int) ss;\
313	t=(int) tt;\
314	dsdx= (int)( (dszdx - ssfdzdx)zinv );\
315	dtdx= (int)( (dtzdx - ttfdzdx)zinv );\
316	fz+=fndzdx;\
317	zinv=1.0 / fz;\
318	}\
319	PUT_PIXEL(0); \
320	PUT_PIXEL(1); \
321	PUT_PIXEL(2); \
322	PUT_PIXEL(3); \
323	PUT_PIXEL(4); \
324	PUT_PIXEL(5); \
325	PUT_PIXEL(6); \
326	PUT_PIXEL(7); \
327	pz+=NB_INTERP; \
328	pp=(PIXEL )((char )pp + NB_INTERP * PSZB);\
329	n-=NB_INTERP; \
330	sz+=ndszdx;\
331	tz+=ndtzdx;\
332	} \
333	{\
334	float ss,tt;\
335	ss=(sz * zinv);\
336	tt=(tz * zinv);\
337	s=(int) ss;\
338	t=(int) tt;\
339	dsdx= (int)( (dszdx - ssfdzdx)zinv );\
340	dtdx= (int)( (dtzdx - ttfdzdx)zinv );\
341	}\
342	while (n>=0) { \
343	PUT_PIXEL(0); \
344	pz+=1; \
345	pp=(PIXEL )((char )pp + PSZB);\
346	n-=1; \
347	} \
348	}
349
350	#include "ztriangle.h"
351	}
352
353	#endif
354
355	#if 0
356
357	/* slow but exact version (only there for reference, incorrect for 24
358	bits) */
359
360	void ZB_fillTriangleMappingPerspective(ZBuffer *zb,
361	ZBufferPoint p0,ZBufferPoint p1,ZBufferPoint *p2)
362	{
363	PIXEL *texture;
364
365	#define INTERP_Z
366	#define INTERP_STZ
367
368	#define DRAW_INIT() \
369	{ \
370	texture=zb->current_texture; \
371	}
372
373	#define PUT_PIXEL(_a) \
374	{ \
375	float zinv; \
376	int s,t; \
377	zz=z >> ZB_POINT_Z_FRAC_BITS; \
378	if (ZCMP(zz,pz[_a])) { \
379	zinv= 1.0 / (float) z; \
380	s= (int) (sz * zinv); \
381	t= (int) (tz * zinv); \
382	pp[_a]=texture[((t & 0x3FC00000) \| s) >> 14]; \
383	pz[_a]=zz; \
384	} \
385	z+=dzdx; \
386	sz+=dszdx; \
387	tz+=dtzdx; \
388	}
389
390	#include "ztriangle.h"
391	}
392
393
394	#endif

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