ref: 69bb5d2e46d772c1203fde9f1d35c22cfd956daa
dir: /src/ztriangle.c/
#include "../include/zbuffer.h"
#include "msghandling.h"
#include <stdlib.h>
/* TODO: Switch from scanline rasterizer to easily parallelized cross product rasterizer.*/
static GLfloat edgeFunction(GLfloat ax, GLfloat ay, GLfloat bx, GLfloat by, GLfloat cx, GLfloat cy) {
return (cx - ax) * (by - ay) - (cy - ay) * (bx - ax);
}
#if TGL_FEATURE_RENDER_BITS == 32
#elif TGL_FEATURE_RENDER_BITS == 16
#else
#error "WRONG MODE!!!"
#endif
#if TGL_FEATURE_POLYGON_STIPPLE == 1
#define TGL_STIPPLEVARS \
GLubyte* zbstipplepattern = zb->stipplepattern; \
GLubyte zbdostipple = zb->dostipple;
#define THE_X ((GLint)(pp - pp1))
#define XSTIP(_a) ((THE_X + _a) & TGL_POLYGON_STIPPLE_MASK_X)
#define YSTIP (the_y & TGL_POLYGON_STIPPLE_MASK_Y)
/* NOTES Divide by 8 to get the byte Get the actual bit*/
#define STIPBIT(_a) (zbstipplepattern[(XSTIP(_a) | (YSTIP << TGL_POLYGON_STIPPLE_POW2_WIDTH)) >> 3] & (1 << (XSTIP(_a) & 7)))
#define STIPTEST(_a) &&(!(zbdostipple && !STIPBIT(_a)))
#else
#define TGL_STIPPLEVARS /* a comment */
#define STIPTEST(_a) /* a comment*/
#endif
#if TGL_FEATURE_NO_DRAW_COLOR == 1
#define NODRAWTEST(c) &&((c & TGL_COLOR_MASK) != TGL_NO_DRAW_COLOR)
#else
#define NODRAWTEST(c) /* a comment */
#endif
#define ZCMP(z, zpix, _a, c) (((!zbdt) || (z >= zpix)) STIPTEST(_a) NODRAWTEST(c))
#define ZCMPSIMP(z, zpix, _a, crabapple) (((!zbdt) || (z >= zpix)) STIPTEST(_a))
void ZB_fillTriangleFlat(ZBuffer* zb, ZBufferPoint* p0, ZBufferPoint* p1, ZBufferPoint* p2) {
GLubyte zbdt = zb->depth_test;
GLubyte zbdw = zb->depth_write;
GLuint color;
TGL_BLEND_VARS
TGL_STIPPLEVARS
#undef INTERP_Z
#undef INTERP_RGB
#undef INTERP_ST
#undef INTERP_STZ
#define INTERP_Z
#define DRAW_INIT() \
{ color = RGB_TO_PIXEL(p2->r, p2->g, p2->b); }
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, color)) { \
TGL_BLEND_FUNC(color, (pp[_a])) /*pp[_a] = color;*/ \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
}
#include "ztriangle.h"
}
void ZB_fillTriangleFlatNOBLEND(ZBuffer* zb, ZBufferPoint* p0, ZBufferPoint* p1, ZBufferPoint* p2) {
PIXEL color = RGB_TO_PIXEL(p2->r, p2->g, p2->b);
GLubyte zbdw = zb->depth_write;
GLubyte zbdt = zb->depth_test;
TGL_STIPPLEVARS
#undef INTERP_Z
#undef INTERP_RGB
#undef INTERP_ST
#undef INTERP_STZ
#define INTERP_Z
#define DRAW_INIT() \
{}
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
pp[_a] = color; \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
}
#include "ztriangle.h"
}
/*
* Smooth filled triangle.
* The code below is very tricky :)
*/
void ZB_fillTriangleSmooth(ZBuffer* zb, ZBufferPoint* p0, ZBufferPoint* p1, ZBufferPoint* p2) {
GLubyte zbdw = zb->depth_write;
GLubyte zbdt = zb->depth_test;
TGL_BLEND_VARS
TGL_STIPPLEVARS
#define INTERP_Z
#define INTERP_RGB
#define SAR_RND_TO_ZERO(v, n) (v / (1 << n))
#if TGL_FEATURE_RENDER_BITS == 32
#define DRAW_INIT() \
{}
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
/*pp[_a] = RGB_TO_PIXEL(or1, og1, ob1);*/ \
TGL_BLEND_FUNC_RGB(or1, og1, ob1, (pp[_a])); \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
og1 += dgdx; \
or1 += drdx; \
ob1 += dbdx; \
}
#elif TGL_FEATURE_RENDER_BITS == 16
#define DRAW_INIT() \
{}
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
/*pp[_a] = RGB_TO_PIXEL(or1, og1, ob1);*/ \
TGL_BLEND_FUNC_RGB(or1, og1, ob1, (pp[_a])); \
\
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
og1 += dgdx; \
or1 += drdx; \
ob1 += dbdx; \
}
#endif
#include "ztriangle.h"
}
void ZB_fillTriangleSmoothNOBLEND(ZBuffer* zb, ZBufferPoint* p0, ZBufferPoint* p1, ZBufferPoint* p2) {
GLubyte zbdw = zb->depth_write;
GLubyte zbdt = zb->depth_test;
TGL_STIPPLEVARS
#define INTERP_Z
#define INTERP_RGB
#define SAR_RND_TO_ZERO(v, n) (v / (1 << n))
#if TGL_FEATURE_RENDER_BITS == 32
#define DRAW_INIT() \
{}
#if TGL_FEATURE_NO_DRAW_COLOR != 1
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
pp[_a] = RGB_TO_PIXEL(or1, og1, ob1); \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
og1 += dgdx; \
or1 += drdx; \
ob1 += dbdx; \
}
#else
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
/*c = RGB_TO_PIXEL(or1, og1, ob1);*/ \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
pp[_a] = RGB_TO_PIXEL(or1, og1, ob1); \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
og1 += dgdx; \
or1 += drdx; \
ob1 += dbdx; \
}
#endif
#elif TGL_FEATURE_RENDER_BITS == 16
#define DRAW_INIT() \
{}
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
pp[_a] = RGB_TO_PIXEL(or1, og1, ob1); \
\
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
og1 += dgdx; \
or1 += drdx; \
ob1 += dbdx; \
}
#endif
/* End of 16 bit mode stuff*/
#include "ztriangle.h"
}
/*
TEXTURE MAPPED TRIANGLES
Section_Header
*/
void ZB_setTexture(ZBuffer* zb, PIXEL* texture) { zb->current_texture = texture; }
#if 1
#define DRAW_LINE_TRI_TEXTURED() \
{ \
register GLushort* pz; \
register PIXEL* pp; \
register GLuint s, t, z; \
register GLint n; \
OR1OG1OB1DECL \
GLfloat sz, tz, fzl, zinv; \
n = (x2 >> 16) - x1; \
fzl = (GLfloat)z1; \
zinv = 1.0 / fzl; \
pp = (PIXEL*)((GLbyte*)pp1 + x1 * PSZB); \
pz = pz1 + x1; \
z = z1; \
sz = sz1; \
tz = tz1; \
while (n >= (NB_INTERP - 1)) { \
register GLint dsdx, dtdx; \
{ \
GLfloat ss, tt; \
ss = (sz * zinv); \
tt = (tz * zinv); \
s = (GLint)ss; \
t = (GLint)tt; \
dsdx = (GLint)((dszdx - ss * fdzdx) * zinv); \
dtdx = (GLint)((dtzdx - tt * fdzdx) * zinv); \
} \
fzl += fndzdx; \
zinv = 1.0 / fzl; \
PUT_PIXEL(0); /*the_x++;*/ \
PUT_PIXEL(1); /*the_x++;*/ \
PUT_PIXEL(2); /*the_x++;*/ \
PUT_PIXEL(3); /*the_x++;*/ \
PUT_PIXEL(4); /*the_x++;*/ \
PUT_PIXEL(5); /*the_x++;*/ \
PUT_PIXEL(6); /*the_x++;*/ \
PUT_PIXEL(7); /*the_x-=7;*/ \
pz += NB_INTERP; \
pp += NB_INTERP; /*the_x+=NB_INTERP * PSZB;*/ \
n -= NB_INTERP; \
sz += ndszdx; \
tz += ndtzdx; \
} \
{ \
register GLint dsdx, dtdx; \
{ \
GLfloat ss, tt; \
ss = (sz * zinv); \
tt = (tz * zinv); \
s = (GLint)ss; \
t = (GLint)tt; \
dsdx = (GLint)((dszdx - ss * fdzdx) * zinv); \
dtdx = (GLint)((dtzdx - tt * fdzdx) * zinv); \
} \
while (n >= 0) { \
PUT_PIXEL(0); \
pz += 1; \
/*pp = (PIXEL*)((GLbyte*)pp + PSZB);*/ \
pp++; \
n -= 1; \
} \
} \
}
void ZB_fillTriangleMappingPerspective(ZBuffer* zb, ZBufferPoint* p0, ZBufferPoint* p1, ZBufferPoint* p2) {
PIXEL* texture;
GLubyte zbdw = zb->depth_write;
GLubyte zbdt = zb->depth_test;
TGL_BLEND_VARS
TGL_STIPPLEVARS
#define INTERP_Z
#define INTERP_STZ
#define INTERP_RGB
#define NB_INTERP 8
#define DRAW_INIT() \
{ \
texture = zb->current_texture; \
fdzdx = (GLfloat)dzdx; \
fndzdx = NB_INTERP * fdzdx; \
ndszdx = NB_INTERP * dszdx; \
ndtzdx = NB_INTERP * dtzdx; \
}
#if TGL_FEATURE_LIT_TEXTURES == 1
#define OR1OG1OB1DECL \
register GLint or1, og1, ob1; \
or1 = r1; \
og1 = g1; \
ob1 = b1;
#define OR1G1B1INCR \
og1 += dgdx; \
or1 += drdx; \
ob1 += dbdx;
#else
#define OR1OG1OB1DECL /*A comment*/
#define OR1G1B1INCR /*Another comment*/
#define or1 COLOR_MULT_MASK
#define og1 COLOR_MULT_MASK
#define ob1 COLOR_MULT_MASK
#endif
#if TGL_FEATURE_NO_DRAW_COLOR != 1
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
/*pp[_a] = RGB_MIX_FUNC(or1, og1, ob1, TEXTURE_SAMPLE(texture, s, t));*/ \
TGL_BLEND_FUNC(RGB_MIX_FUNC(or1, og1, ob1, (TEXTURE_SAMPLE(texture, s, t))), (pp[_a])); \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
s += dsdx; \
t += dtdx; \
OR1G1B1INCR \
}
#else
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
PIXEL c = TEXTURE_SAMPLE(texture, s, t); \
if (ZCMP(zz, pz[_a], _a, c)) { \
TGL_BLEND_FUNC(RGB_MIX_FUNC(or1, og1, ob1, c), (pp[_a])); \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
s += dsdx; \
t += dtdx; \
OR1G1B1INCR \
}
#endif
#define DRAW_LINE() \
{ DRAW_LINE_TRI_TEXTURED() }
#include "ztriangle.h"
}
void ZB_fillTriangleMappingPerspectiveNOBLEND(ZBuffer* zb, ZBufferPoint* p0, ZBufferPoint* p1, ZBufferPoint* p2) {
PIXEL* texture;
GLubyte zbdw = zb->depth_write;
GLubyte zbdt = zb->depth_test;
TGL_STIPPLEVARS
#define INTERP_Z
#define INTERP_STZ
#define INTERP_RGB
#define NB_INTERP 8
#define DRAW_INIT() \
{ \
texture = zb->current_texture; \
fdzdx = (GLfloat)dzdx; \
fndzdx = NB_INTERP * fdzdx; \
ndszdx = NB_INTERP * dszdx; \
ndtzdx = NB_INTERP * dtzdx; \
}
#if TGL_FEATURE_LIT_TEXTURES == 1
#define OR1OG1OB1DECL \
register GLint or1, og1, ob1; \
or1 = r1; \
og1 = g1; \
ob1 = b1;
#define OR1G1B1INCR \
og1 += dgdx; \
or1 += drdx; \
ob1 += dbdx;
#else
#define OR1OG1OB1DECL /*A comment*/
#define OR1G1B1INCR /*Another comment*/
#define or1 COLOR_MULT_MASK
#define og1 COLOR_MULT_MASK
#define ob1 COLOR_MULT_MASK
#endif
#if TGL_FEATURE_NO_DRAW_COLOR != 1
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
if (ZCMPSIMP(zz, pz[_a], _a, 0)) { \
pp[_a] = RGB_MIX_FUNC(or1, og1, ob1, TEXTURE_SAMPLE(texture, s, t)); \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
s += dsdx; \
t += dtdx; \
OR1G1B1INCR \
}
#else
#define PUT_PIXEL(_a) \
{ \
{ \
register GLuint zz = z >> ZB_POINT_Z_FRAC_BITS; \
PIXEL c = TEXTURE_SAMPLE(texture, s, t); \
if (ZCMP(zz, pz[_a], _a, c)) { \
pp[_a] = RGB_MIX_FUNC(or1, og1, ob1, c); \
/*TGL_BLEND_FUNC(RGB_MIX_FUNC(or1, og1, ob1, c), (pp[_a]));*/ \
if (zbdw) \
pz[_a] = zz; \
} \
} \
z += dzdx; \
s += dsdx; \
t += dtdx; \
OR1G1B1INCR \
}
#endif
#define DRAW_LINE() \
{ DRAW_LINE_TRI_TEXTURED() }
#include "ztriangle.h"
}
#endif