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source: trunk/sys/TinyGL/src/ztriangle.c @ 218

Last change on this file since 218 was 1, checked in by alain, 8 years ago
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File size: 7.8 KB

Rev	Line
[1]	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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