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SWrasterize.h
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SWrasterize.h
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#ifndef SW_RASTERIZE_H
#define SW_RASTERIZE_H
#include <assert.h>
#include <math.h>
#include "SWframebuffer.h"
#include "SWprogram.h"
#define _swProjectOnScreen(f, p, out) \
out[0] = (SWint)((f)->w * ((p)[0] + 1) / 2 + (SWfloat)0.5); \
out[1] = (SWint)((f)->h * (-(p)[1] + 1) / 2 + (SWfloat)0.5);
#define _swProjectOnScreenF(f, p, out) \
out[0] = floorf((f)->w * ((p)[0] + 1) / 2 + (SWfloat)0.5); \
out[1] = floorf((f)->h * (-(p)[1] + 1) / 2 + (SWfloat)0.5);
sw_inline void _swBlendPixels(SWframebuffer *f, SWint ix, SWint iy, SWfloat f_out[4]) {
SWfloat f_in[4];
swFbufGetPixel_FRGBA(f, ix, iy, f_in);
SWfloat k = 1 - f_out[3];
f_out[0] = f_in[0] * k + f_out[0] * f_out[3];
f_out[1] = f_in[1] * k + f_out[1] * f_out[3];
f_out[2] = f_in[2] * k + f_out[2] * f_out[3];
}
sw_inline void _swProcessPixelLine(SWprogram *p, SWframebuffer *f, SWint x, SWint y,
SWint b_depth_test, SWint b_depth_write,
SWfloat *vs_out_res) {
SWfloat f_out[4];
SWint b_discard = 0;
if (b_depth_test && !swFbufTestDepth(f, x, y, vs_out_res[2]))
return;
(*p->f_proc)(vs_out_res, p->uniforms, f_out, &b_discard);
if (!b_discard) {
if (b_depth_write) {
swFbufSetDepth(f, x, y, vs_out_res[2]);
}
swFbufBGRA8888_SetPixel_FRGBA(f, x, y, f_out);
}
}
sw_inline void _swProcessLine(SWprogram *p, SWframebuffer *f,
SWfloat vs_out1[SW_MAX_VTX_ATTRIBS],
SWfloat vs_out2[SW_MAX_VTX_ATTRIBS], SWint b_depth_test,
SWint b_depth_write) {
SWfloat t = 0.0f;
SWint x, p0[2], p1[2];
_swProjectOnScreen(f, vs_out1, p0);
_swProjectOnScreen(f, vs_out2, p1);
SWfloat *RESTRICT fs_in1 = vs_out1;
SWfloat *RESTRICT fs_in2 = vs_out2;
SWfloat fs_res[SW_MAX_VTX_ATTRIBS], fs_delta[SW_MAX_VTX_ATTRIBS];
SWint steep = 0;
SWint w = f->w, h = f->h;
if (sw_abs(p0[0] - p1[0]) < sw_abs(p0[1] - p1[1])) {
sw_swap(p0[0], p0[1], SWint);
sw_swap(p1[0], p1[1], SWint);
sw_swap(w, h, SWint);
steep = 1;
}
if (p0[0] > p1[0]) {
sw_swap(p0[0], p1[0], SWint);
sw_swap(p0[1], p1[1], SWint);
sw_swap(fs_in1, fs_in2, SWfloat *);
}
SWint dx = p1[0] - p0[0], dy = p1[1] - p0[1];
SWint derror2 = sw_abs(dy) * 2;
SWint error2 = 0;
SWint y = p0[1];
SWfloat dt = (SWfloat)1.0 / (p1[0] - p0[0]);
SWint i;
for (i = 0; i < p->v_out_size; i++) {
fs_delta[i] = dt * (fs_in2[i] - fs_in1[i]);
fs_res[i] = fs_in1[i];
}
for (x = p0[0]; x <= p1[0]; x++) {
if ((x < 0 || x >= w || y < 0 || y >= h) || /* test against viewport bounds */
(fs_in1[2] < 0 || fs_in1[2] > 1)) { /* test against depth bounds */
/* skip fragment */
} else {
if (!steep) {
_swProcessPixelLine(p, f, x, y, b_depth_test, b_depth_write, fs_res);
} else {
_swProcessPixelLine(p, f, y, x, b_depth_test, b_depth_write, fs_res);
}
}
sw_add(fs_res, fs_delta, p->v_out_size);
error2 += derror2;
t += dt;
if (error2 > dx) {
y += (p1[1] > p0[1] ? 1 : -1);
error2 -= dx * 2;
}
}
}
void _swProcessCurveRecursive(SWprogram *p, SWframebuffer *f,
SWfloat p1[SW_MAX_VTX_ATTRIBS],
SWfloat p2[SW_MAX_VTX_ATTRIBS],
SWfloat p3[SW_MAX_VTX_ATTRIBS],
SWfloat p4[SW_MAX_VTX_ATTRIBS], SWint b_depth_test,
SWint b_depth_write, SWfloat tolerance);
sw_inline void _swProcessCurve(SWprogram *p, SWframebuffer *f,
SWfloat vs_out[4][SW_MAX_VTX_ATTRIBS], SWint _1, SWint _2,
SWint _3, SWint _4, SWint b_depth_test,
SWint b_depth_write, SWfloat tolerance) {
_swProcessCurveRecursive(p, f, vs_out[_1], vs_out[_2], vs_out[_3], vs_out[_4],
b_depth_test, b_depth_write, tolerance);
}
/******* Perspective correct interpolation *******/
sw_inline SWint _swIntepolateTri_correct(SWprogram *p, SWframebuffer *f,
SWint b_depth_test, SWfloat *depth, SWint x,
SWint y, SWfloat *RESTRICT f0,
SWfloat *RESTRICT f1, SWfloat *RESTRICT f2,
SWfloat uvw[3], SWfloat *ff) {
SWint i;
/* test against depth boundaries */
if (ff[2] < 0 || ff[2] > 1) {
return 0;
}
/* test against depth buffer */
if (b_depth_test && !swFbufTestDepth(f, x, y, ff[2])) {
return 0;
}
*depth = ff[2];
for (i = 4; i < p->v_out_size; i++) {
ff[i] = uvw[0] * f0[i] + uvw[1] * f1[i] + uvw[2] * f2[i];
}
return 1;
}
sw_inline void _swProcessPixel_correct(SWprogram *p, SWframebuffer *f, SWint ix, SWint iy,
SWfloat uvw[3], SWfloat *f0, SWfloat *f1,
SWfloat *f2, SWfloat *vs_interpolated,
SWint b_depth_test, SWint b_depth_write,
SWint b_blend) {
SWfloat depth;
if (_swIntepolateTri_correct(p, f, b_depth_test, &depth, ix, iy, f0, f1, f2, uvw,
vs_interpolated)) {
SWfloat f_out[4];
SWint b_discard = 0;
(*p->f_proc)(vs_interpolated, p->uniforms, f_out, &b_discard);
if (!b_discard) {
if (b_depth_write) {
swFbufSetDepth(f, ix, iy, depth);
}
if (b_blend) {
_swBlendPixels(f, ix, iy, f_out);
}
swFbufSetPixel_FRGBA(f, ix, iy, f_out);
}
}
}
sw_inline void _swProcessTriangle_correct(SWprogram *p, SWframebuffer *f,
SWfloat vs_out[3][SW_MAX_VTX_ATTRIBS], SWint _0,
SWint _1, SWint _2, SWint b_depth_test,
SWint b_depth_write, SWint b_blend) {
SWint x, y, p0[2], p1[2], p2[2];
SWint min[2], max[2];
SWfloat *pos0 = vs_out[_0], *pos1 = vs_out[_1], *pos2 = vs_out[_2];
SWint d01[2], d12[2], d20[2];
SWint area;
SWfloat inv_area;
SWint C1, C2, C3;
SWfloat vs_interpolated[SW_MAX_VTX_ATTRIBS];
_swProjectOnScreen(f, pos0, p0);
_swProjectOnScreen(f, pos1, p1);
_swProjectOnScreen(f, pos2, p2);
min[0] = sw_min(p0[0], sw_min(p1[0], p2[0]));
min[1] = sw_min(p0[1], sw_min(p1[1], p2[1]));
max[0] = sw_max(p0[0], sw_max(p1[0], p2[0]));
max[1] = sw_max(p0[1], sw_max(p1[1], p2[1]));
if (min[0] >= f->w || min[1] >= f->h || max[0] < 0 || max[1] < 0)
return;
if (min[0] < 0)
min[0] = 0;
if (min[1] < 0)
min[1] = 0;
if (max[0] >= f->w)
max[0] = f->w - 1;
if (max[1] >= f->h)
max[1] = f->h - 1;
min[0] &= ~(SW_TILE_SIZE - 1);
min[1] &= ~(SW_TILE_SIZE - 1);
d01[0] = p0[0] - p1[0];
d01[1] = p0[1] - p1[1];
d12[0] = p1[0] - p2[0];
d12[1] = p1[1] - p2[1];
d20[0] = p2[0] - p0[0];
d20[1] = p2[1] - p0[1];
area = d01[0] * d20[1] - d20[0] * d01[1];
if (area <= 0)
return;
inv_area = ((SWfloat)1) / area;
C1 = d01[1] * p0[0] - d01[0] * p0[1];
C2 = d12[1] * p1[0] - d12[0] * p1[1];
C3 = d20[1] * p2[0] - d20[0] * p2[1];
if (d01[1] < 0 || (d01[1] == 0 && d01[0] > 0))
C1++;
if (d12[1] < 0 || (d12[1] == 0 && d12[0] > 0))
C2++;
if (d20[1] < 0 || (d20[1] == 0 && d20[0] > 0))
C3++;
for (y = min[1]; y < max[1]; y += SW_TILE_SIZE) {
for (x = min[0]; x < max[0]; x += SW_TILE_SIZE) {
SWint x0 = x, x1 = sw_min(x + SW_TILE_SIZE - 1, f->w - 1), y0 = y,
y1 = sw_min(y + SW_TILE_SIZE - 1, f->h - 1);
SWint full_tile =
(x1 - x0 == SW_TILE_SIZE - 1) && (y1 - y0 == SW_TILE_SIZE - 1);
SWint Cy1 = C1 + d01[0] * y0 - d01[1] * x0;
SWint Cy2 = C2 + d12[0] * y0 - d12[1] * x0;
SWint Cy3 = C3 + d20[0] * y0 - d20[1] * x0;
SWint a = (Cy1 > 0 ? 1 : 0) + (C1 + d01[0] * y0 - d01[1] * x1 > 0 ? 2 : 0) +
(C1 + d01[0] * y1 - d01[1] * x0 > 0 ? 4 : 0) +
(C1 + d01[0] * y1 - d01[1] * x1 > 0 ? 8 : 0);
SWint b = (Cy2 > 0 ? 1 : 0) + (C2 + d12[0] * y0 - d12[1] * x1 > 0 ? 2 : 0) +
(C2 + d12[0] * y1 - d12[1] * x0 > 0 ? 4 : 0) +
(C2 + d12[0] * y1 - d12[1] * x1 > 0 ? 8 : 0);
SWint c = (Cy3 > 0 ? 1 : 0) + (C3 + d20[0] * y0 - d20[1] * x1 > 0 ? 2 : 0) +
(C3 + d20[0] * y1 - d20[1] * x0 > 0 ? 4 : 0) +
(C3 + d20[0] * y1 - d20[1] * x1 > 0 ? 8 : 0);
if (a == 0 || b == 0 || c == 0)
continue;
if (a == 15 && b == 15 && c == 15 && full_tile) {
SWint ix, iy;
for (iy = y; iy < y + SW_TILE_SIZE; iy++) {
SWint Cx1 = Cy1, Cx3 = Cy3;
for (ix = x; ix < x + SW_TILE_SIZE; ix++) {
SWfloat uvw[3] = {0, Cx3 * inv_area, Cx1 * inv_area};
uvw[0] = 1 - uvw[1] - uvw[2];
vs_interpolated[2] =
uvw[0] * pos0[2] + uvw[1] * pos1[2] + uvw[2] * pos2[2];
SWfloat inv_w =
1 / (uvw[0] * pos0[3] + uvw[1] * pos1[3] + uvw[2] * pos2[3]);
uvw[0] *= inv_w;
uvw[1] *= inv_w;
uvw[2] *= inv_w;
_swProcessPixel_correct(p, f, ix, iy, uvw, pos0, pos1, pos2,
vs_interpolated, b_depth_test,
b_depth_write, b_blend);
Cx1 -= d01[1];
Cx3 -= d20[1];
}
Cy1 += d01[0];
Cy3 += d20[0];
}
} else {
SWint ix, iy;
for (iy = y; iy <= y1; iy++) {
SWint Cx1 = Cy1, Cx2 = Cy2, Cx3 = Cy3;
for (ix = x; ix <= x1; ix++) {
if (Cx1 > 0 && Cx2 > 0 && Cx3 > 0) {
SWfloat uvw[3] = {0, Cx3 * inv_area, Cx1 * inv_area};
uvw[0] = 1 - uvw[1] - uvw[2];
vs_interpolated[2] =
uvw[0] * pos0[2] + uvw[1] * pos1[2] + uvw[2] * pos2[2];
SWfloat inv_w = 1 / (uvw[0] * pos0[3] + uvw[1] * pos1[3] +
uvw[2] * pos2[3]);
uvw[0] *= inv_w;
uvw[1] *= inv_w;
uvw[2] *= inv_w;
_swProcessPixel_correct(p, f, ix, iy, uvw, pos0, pos1, pos2,
vs_interpolated, b_depth_test,
b_depth_write, b_blend);
}
Cx1 -= d01[1];
Cx2 -= d12[1];
Cx3 -= d20[1];
}
Cy1 += d01[0];
Cy2 += d12[0];
Cy3 += d20[0];
}
}
}
}
}
/******* Affine interpolation *******/
sw_inline SWint _swIntepolateTri_nocorrect(SWframebuffer *f, SWint b_depth_test,
SWfloat *depth, SWint x, SWint y,
SWfloat *ff) {
/* test against depth boundaries */
if (ff[2] < 0 || ff[2] > 1) {
return 0;
}
/* test against depth buffer */
if (b_depth_test && !swFbufTestDepth(f, x, y, ff[2])) {
return 0;
}
*depth = ff[2];
return 1;
}
sw_inline void _swProcessPixel_nocorrect(SWprogram *p, SWframebuffer *f, SWint ix,
SWint iy,
SWfloat vs_interpolated[SW_MAX_VTX_ATTRIBS],
SWint b_depth_test, SWint b_depth_write,
SWint b_blend) {
SWfloat depth;
if (_swIntepolateTri_nocorrect(f, b_depth_test, &depth, ix, iy, vs_interpolated)) {
SWfloat f_out[4];
SWint b_discard = 0;
(*p->f_proc)(vs_interpolated, p->uniforms, f_out, &b_discard);
if (!b_discard) {
if (b_depth_write) {
swFbufSetDepth(f, ix, iy, depth);
}
if (b_blend) {
_swBlendPixels(f, ix, iy, f_out);
}
swFbufSetPixel_FRGBA(f, ix, iy, f_out);
}
}
}
sw_inline void _swProcessTriangle_nocorrect(SWprogram *p, SWframebuffer *f,
SWfloat vs_out[3][SW_MAX_VTX_ATTRIBS],
SWint _0, SWint _1, SWint _2,
SWint b_depth_test, SWint b_depth_write,
SWint b_blend) {
SWint i, x, y, p0[2], p1[2], p2[2];
SWint min[2], max[2];
SWfloat *pos0 = vs_out[_0], *pos1 = vs_out[_1], *pos2 = vs_out[_2];
SWint d01[2], d12[2], d20[2];
SWint area;
SWfloat inv_area;
SWint C1, C2, C3;
SWfloat vs_interpolated[SW_MAX_VTX_ATTRIBS];
SWfloat vs_d10[SW_MAX_VTX_ATTRIBS], vs_d20[SW_MAX_VTX_ATTRIBS];
const SWint num_attributes = p->v_out_size;
_swProjectOnScreen(f, pos0, p0);
_swProjectOnScreen(f, pos1, p1);
_swProjectOnScreen(f, pos2, p2);
min[0] = sw_min(p0[0], sw_min(p1[0], p2[0]));
min[1] = sw_min(p0[1], sw_min(p1[1], p2[1]));
max[0] = sw_max(p0[0], sw_max(p1[0], p2[0]));
max[1] = sw_max(p0[1], sw_max(p1[1], p2[1]));
if (min[0] >= f->w || min[1] >= f->h || max[0] < 0 || max[1] < 0)
return;
if (min[0] < 0)
min[0] = 0;
if (min[1] < 0)
min[1] = 0;
if (max[0] >= f->w)
max[0] = f->w - 1;
if (max[1] >= f->h)
max[1] = f->h - 1;
min[0] &= ~(SW_TILE_SIZE - 1);
min[1] &= ~(SW_TILE_SIZE - 1);
d01[0] = p0[0] - p1[0];
d01[1] = p0[1] - p1[1];
d12[0] = p1[0] - p2[0];
d12[1] = p1[1] - p2[1];
d20[0] = p2[0] - p0[0];
d20[1] = p2[1] - p0[1];
area = d01[0] * d20[1] - d20[0] * d01[1];
if (area <= 0)
return;
inv_area = ((SWfloat)1) / area;
C1 = d01[1] * p0[0] - d01[0] * p0[1];
C2 = d12[1] * p1[0] - d12[0] * p1[1];
C3 = d20[1] * p2[0] - d20[0] * p2[1];
if (d01[1] < 0 || (d01[1] == 0 && d01[0] > 0))
C1++;
if (d12[1] < 0 || (d12[1] == 0 && d12[0] > 0))
C2++;
if (d20[1] < 0 || (d20[1] == 0 && d20[0] > 0))
C3++;
for (i = 0; i < num_attributes; i++) {
vs_d10[i] = vs_out[_1][i] - vs_out[_0][i];
vs_d20[i] = vs_out[_2][i] - vs_out[_0][i];
}
for (y = min[1]; y < max[1]; y += SW_TILE_SIZE) {
for (x = min[0]; x < max[0]; x += SW_TILE_SIZE) {
SWint x0 = x, x1 = sw_min(x + SW_TILE_SIZE - 1, f->w - 1), y0 = y,
y1 = sw_min(y + SW_TILE_SIZE - 1, f->h - 1);
SWint full_tile =
(x1 - x0 == SW_TILE_SIZE - 1) && (y1 - y0 == SW_TILE_SIZE - 1);
SWint Cy1 = C1 + d01[0] * y0 - d01[1] * x0;
SWint Cy2 = C2 + d12[0] * y0 - d12[1] * x0;
SWint Cy3 = C3 + d20[0] * y0 - d20[1] * x0;
SWint Cy1_10 = C1 + d01[0] * y0 - d01[1] * x1;
SWint Cy2_10 = C2 + d12[0] * y0 - d12[1] * x1;
SWint Cy3_10 = C3 + d20[0] * y0 - d20[1] * x1;
SWint Cy1_01 = C1 + d01[0] * y1 - d01[1] * x0;
SWint Cy2_01 = C2 + d12[0] * y1 - d12[1] * x0;
SWint Cy3_01 = C3 + d20[0] * y1 - d20[1] * x0;
SWint Cy1_11 = C1 + d01[0] * y1 - d01[1] * x1;
SWint Cy2_11 = C2 + d12[0] * y1 - d12[1] * x1;
SWint Cy3_11 = C3 + d20[0] * y1 - d20[1] * x1;
SWint a = ((Cy1 > 0) << 0) | ((Cy1_10 > 0) << 1) | ((Cy1_01 > 0) << 2) |
((Cy1_11 > 0) << 3);
SWint b = ((Cy2 > 0) << 0) | ((Cy2_10 > 0) << 1) | ((Cy2_01 > 0) << 2) |
((Cy2_11 > 0) << 3);
SWint c = ((Cy3 > 0) << 0) | ((Cy3_10 > 0) << 1) | ((Cy3_01 > 0) << 2) |
((Cy3_11 > 0) << 3);
if (a == 0 || b == 0 || c == 0)
continue;
SWint full_cover = (a == 15 && b == 15 && c == 15) && full_tile;
/////
SWfloat f00_z =
pos0[2] + Cy3 * inv_area * vs_d10[2] + Cy1 * inv_area * vs_d20[2];
SWfloat f10_z =
pos0[2] + Cy3_10 * inv_area * vs_d10[2] + Cy1_10 * inv_area * vs_d20[2];
SWfloat f01_z =
pos0[2] + Cy3_01 * inv_area * vs_d10[2] + Cy1_01 * inv_area * vs_d20[2];
SWfloat f11_z =
pos0[2] + Cy3_11 * inv_area * vs_d10[2] + Cy1_11 * inv_area * vs_d20[2];
SWfloat zmin = sw_min(f00_z, sw_min(f10_z, sw_min(f01_z, f11_z)));
SWfloat zmax = sw_max(f00_z, sw_max(f10_z, sw_max(f01_z, f11_z)));
SWint depth_test = b_depth_test;
SWoccresult res = SW_PARTIAL;
if (depth_test) {
res = swFbufTestTileRange(f, x0, y0, zmin, zmax);
if (res == SW_OCCLUDED) {
continue;
} else if (res == SW_NONOCCLUDED) {
depth_test = 0;
}
}
if (b_depth_write) {
if (full_cover && res == SW_NONOCCLUDED) {
swFbufSetTileRange(f, x0, y0, zmin, zmax);
} else {
swFbufUpdateTileRange(f, x0, y0, zmin, zmax);
}
}
SWfloat vs_dx[SW_MAX_VTX_ATTRIBS], vs_dy[SW_MAX_VTX_ATTRIBS];
for (i = 0; i < num_attributes; i++) {
vs_dx[i] = -d20[1] * inv_area * vs_d10[i] - d01[1] * inv_area * vs_d20[i];
vs_dy[i] = d20[0] * inv_area * vs_d10[i] + d01[0] * inv_area * vs_d20[i] -
SW_TILE_SIZE * vs_dx[i];
vs_interpolated[i] =
pos0[i] + Cy3 * inv_area * vs_d10[i] + Cy1 * inv_area * vs_d20[i];
}
/////
if (full_cover) {
SWint ix, iy;
for (iy = y; iy < y + SW_TILE_SIZE; iy++) {
SWint Cx1 = Cy1, Cx3 = Cy3;
for (ix = x; ix < x + SW_TILE_SIZE; ix++) {
_swProcessPixel_nocorrect(p, f, ix, iy, vs_interpolated,
depth_test, b_depth_write, b_blend);
sw_add(vs_interpolated, vs_dx, num_attributes);
Cx1 -= d01[1];
Cx3 -= d20[1];
}
sw_add(vs_interpolated, vs_dy, num_attributes);
Cy1 += d01[0];
Cy3 += d20[0];
}
} else {
SWint ix, iy;
for (iy = y; iy <= y1; iy++) {
SWint Cx1 = Cy1, Cx2 = Cy2, Cx3 = Cy3;
for (ix = x; ix <= x1; ix++) {
if (Cx1 > 0 && Cx2 > 0 && Cx3 > 0) {
_swProcessPixel_nocorrect(p, f, ix, iy, vs_interpolated,
depth_test, b_depth_write, b_blend);
}
sw_add(vs_interpolated, vs_dx, num_attributes);
Cx1 -= d01[1];
Cx2 -= d12[1];
Cx3 -= d20[1];
}
sw_add(vs_interpolated, vs_dy, num_attributes);
Cy1 += d01[0];
Cy2 += d12[0];
Cy3 += d20[0];
}
}
}
}
}
/*******************************/
sw_inline SWint _swIntepolateTri_fast(SWframebuffer *f, SWint b_depth_test,
SWfloat *depth, SWint x, SWint y, SWfloat *ff) {
/* test against depth boundaries */
if (ff[2] < 0 || ff[2] > 1) {
return 0;
}
/* test against depth buffer */
if (b_depth_test && !swFbufTestDepth(f, x, y, ff[2])) {
return 0;
}
*depth = ff[2];
return 1;
}
sw_inline void _swProcessPixel_fast(SWprogram *p, SWframebuffer *f, SWint ix, SWint iy,
SWfloat vs_interpolated[SW_MAX_VTX_ATTRIBS],
SWint b_depth_test, SWint b_depth_write,
SWint b_blend) {
SWfloat depth;
if (_swIntepolateTri_fast(f, b_depth_test, &depth, ix, iy, vs_interpolated)) {
SWfloat f_out[4];
SWint b_discard = 0;
(*p->f_proc)(vs_interpolated, p->uniforms, f_out, &b_discard);
if (!b_discard) {
if (b_depth_write) {
swFbufSetDepth(f, ix, iy, depth);
}
if (b_blend) {
_swBlendPixels(f, ix, iy, f_out);
}
swFbufSetPixel_FRGBA(f, ix, iy, f_out);
}
}
}
sw_inline void _swProcessTriangle_fast(SWprogram *p, SWframebuffer *f,
SWfloat vs_out[3][SW_MAX_VTX_ATTRIBS], SWint _0,
SWint _1, SWint _2, SWint b_depth_test,
SWint b_depth_write, SWint b_blend) {
SWint i, x, y, p0[2], p1[2], p2[2];
SWint min[2], max[2];
SWfloat *pos0 = vs_out[_0], *pos1 = vs_out[_1], *pos2 = vs_out[_2];
SWint d01[2], d12[2], d20[2];
SWint area;
SWfloat inv_area;
SWint C1, C2, C3;
SWfloat vs_interpolated[SW_MAX_VTX_ATTRIBS];
SWfloat vs_d10[SW_MAX_VTX_ATTRIBS], vs_d20[SW_MAX_VTX_ATTRIBS];
const SWint num_attributes = p->v_out_size;
_swProjectOnScreen(f, pos0, p0);
_swProjectOnScreen(f, pos1, p1);
_swProjectOnScreen(f, pos2, p2);
min[0] = sw_min(p0[0], sw_min(p1[0], p2[0]));
min[1] = sw_min(p0[1], sw_min(p1[1], p2[1]));
max[0] = sw_max(p0[0], sw_max(p1[0], p2[0]));
max[1] = sw_max(p0[1], sw_max(p1[1], p2[1]));
if (min[0] >= f->w || min[1] >= f->h || max[0] < 0 || max[1] < 0)
return;
if (min[0] < 0)
min[0] = 0;
if (min[1] < 0)
min[1] = 0;
if (max[0] >= f->w)
max[0] = f->w - 1;
if (max[1] >= f->h)
max[1] = f->h - 1;
min[0] &= ~(SW_TILE_SIZE - 1);
min[1] &= ~(SW_TILE_SIZE - 1);
d01[0] = p0[0] - p1[0];
d01[1] = p0[1] - p1[1];
d12[0] = p1[0] - p2[0];
d12[1] = p1[1] - p2[1];
d20[0] = p2[0] - p0[0];
d20[1] = p2[1] - p0[1];
area = d01[0] * d20[1] - d20[0] * d01[1];
if (area <= 0)
return;
inv_area = ((SWfloat)1) / area;
C1 = d01[1] * p0[0] - d01[0] * p0[1];
C2 = d12[1] * p1[0] - d12[0] * p1[1];
C3 = d20[1] * p2[0] - d20[0] * p2[1];
if (d01[1] < 0 || (d01[1] == 0 && d01[0] > 0))
C1++;
if (d12[1] < 0 || (d12[1] == 0 && d12[0] > 0))
C2++;
if (d20[1] < 0 || (d20[1] == 0 && d20[0] > 0))
C3++;
for (i = 0; i < num_attributes; i++) {
vs_d10[i] = vs_out[_1][i] - vs_out[_0][i];
vs_d20[i] = vs_out[_2][i] - vs_out[_0][i];
}
for (y = min[1]; y < max[1]; y += SW_TILE_SIZE) {
for (x = min[0]; x < max[0]; x += SW_TILE_SIZE) {
SWint x0 = x, x1 = sw_min(x + SW_TILE_SIZE - 1, f->w - 1), y0 = y,
y1 = sw_min(y + SW_TILE_SIZE - 1, f->h - 1);
SWint full_tile =
(x1 - x0 == SW_TILE_SIZE - 1) && (y1 - y0 == SW_TILE_SIZE - 1);
SWint Cy1_00 = C1 + d01[0] * y0 - d01[1] * x0,
Cy2_00 = C2 + d12[0] * y0 - d12[1] * x0,
Cy3_00 = C3 + d20[0] * y0 - d20[1] * x0;
SWint Cy1_10 = C1 + d01[0] * y0 - d01[1] * x1,
Cy2_10 = C2 + d12[0] * y0 - d12[1] * x1,
Cy3_10 = C3 + d20[0] * y0 - d20[1] * x1;
SWint Cy1_01 = C1 + d01[0] * y1 - d01[1] * x0,
Cy2_01 = C2 + d12[0] * y1 - d12[1] * x0,
Cy3_01 = C3 + d20[0] * y1 - d20[1] * x0;
SWint Cy1_11 = C1 + d01[0] * y1 - d01[1] * x1,
Cy2_11 = C2 + d12[0] * y1 - d12[1] * x1,
Cy3_11 = C3 + d20[0] * y1 - d20[1] * x1;
SWint a = ((Cy1_00 > 0) << 0) | ((Cy1_10 > 0) << 1) | ((Cy1_01 > 0) << 2) |
((Cy1_11 > 0) << 3);
SWint b = ((Cy2_00 > 0) << 0) | ((Cy2_10 > 0) << 1) | ((Cy2_01 > 0) << 2) |
((Cy2_11 > 0) << 3);
SWint c = ((Cy3_00 > 0) << 0) | ((Cy3_10 > 0) << 1) | ((Cy3_01 > 0) << 2) |
((Cy3_11 > 0) << 3);
if (a == 0 || b == 0 || c == 0)
continue;
SWint full_cover = (a == 15 && b == 15 && c == 15) && full_tile;
/////
SWfloat f00[SW_MAX_VTX_ATTRIBS], f10[SW_MAX_VTX_ATTRIBS],
f01[SW_MAX_VTX_ATTRIBS], f11[SW_MAX_VTX_ATTRIBS];
SWfloat step_x[SW_MAX_VTX_ATTRIBS] = {0};
// SWfloat step_y_left[SW_MAX_VTX_ATTRIBS],
// step_y_right[SW_MAX_VTX_ATTRIBS];
SWfloat *step_y_left = f01, *step_y_right = f11;
f00[2] =
pos0[2] + Cy3_00 * inv_area * vs_d10[2] + Cy1_00 * inv_area * vs_d20[2];
f10[2] =
pos0[2] + Cy3_10 * inv_area * vs_d10[2] + Cy1_10 * inv_area * vs_d20[2];
f01[2] =
pos0[2] + Cy3_01 * inv_area * vs_d10[2] + Cy1_01 * inv_area * vs_d20[2];
f11[2] =
pos0[2] + Cy3_11 * inv_area * vs_d10[2] + Cy1_11 * inv_area * vs_d20[2];
SWfloat zmin = sw_min(f00[2], sw_min(f10[2], sw_min(f01[2], f11[2])));
SWfloat zmax = sw_max(f00[2], sw_max(f10[2], sw_max(f01[2], f11[2])));
SWint depth_test = b_depth_test;
SWoccresult res = SW_PARTIAL;
if (depth_test) {
res = swFbufTestTileRange(f, x0, y0, zmin, zmax);
if (res == SW_OCCLUDED) {
continue;
} else if (res == SW_NONOCCLUDED) {
depth_test = 0;
}
}
if (b_depth_write) {
if (full_cover && res == SW_NONOCCLUDED) {
swFbufSetTileRange(f, x0, y0, zmin, zmax);
} else {
swFbufUpdateTileRange(f, x0, y0, zmin, zmax);
}
}
step_y_left[2] = (f01[2] - f00[2]) * SW_INV_TILE_STEP;
step_y_right[2] = (f11[2] - f10[2]) * SW_INV_TILE_STEP;
/*******/
SWfloat k1_00 = Cy3_00 * inv_area, k2_00 = Cy1_00 * inv_area;
SWfloat inv_w_00 = 1 / (pos0[3] + k1_00 * vs_d10[3] + k2_00 * vs_d20[3]);
SWfloat k1_10 = Cy3_10 * inv_area, k2_10 = Cy1_10 * inv_area;
SWfloat inv_w_10 = 1 / (pos0[3] + k1_10 * vs_d10[3] + k2_10 * vs_d20[3]);
SWfloat k1_01 = Cy3_01 * inv_area, k2_01 = Cy1_01 * inv_area;
SWfloat inv_w_01 = 1 / (pos0[3] + k1_01 * vs_d10[3] + k2_01 * vs_d20[3]);
SWfloat k1_11 = Cy3_11 * inv_area, k2_11 = Cy1_11 * inv_area;
SWfloat inv_w_11 = 1 / (pos0[3] + k1_11 * vs_d10[3] + k2_11 * vs_d20[3]);
for (i = 0; i < num_attributes; i++) {
if (i == 2)
continue;
f00[i] = pos0[i] + k1_00 * vs_d10[i] + k2_00 * vs_d20[i];
f10[i] = pos0[i] + k1_10 * vs_d10[i] + k2_10 * vs_d20[i];
f01[i] = pos0[i] + k1_01 * vs_d10[i] + k2_01 * vs_d20[i];
f11[i] = pos0[i] + k1_11 * vs_d10[i] + k2_11 * vs_d20[i];
f00[i] *= inv_w_00;
f10[i] *= inv_w_10;
f01[i] *= inv_w_01;
f11[i] *= inv_w_11;
step_y_left[i] = (f01[i] - f00[i]) * SW_INV_TILE_STEP;
step_y_right[i] = (f11[i] - f10[i]) * SW_INV_TILE_STEP;
}
/*******/
if (full_cover) {
SWint ix, iy;
for (iy = y; iy < y + SW_TILE_SIZE; iy++) {
SWint attr;
for (attr = 0; attr < num_attributes; attr++) {
vs_interpolated[attr] = f00[attr];
step_x[attr] = (f10[attr] - f00[attr]) * SW_INV_TILE_STEP;
}
for (ix = x; ix < x + SW_TILE_SIZE; ix++) {
_swProcessPixel_fast(p, f, ix, iy, vs_interpolated, depth_test,
b_depth_write, b_blend);
sw_add(vs_interpolated, step_x, num_attributes);
}
sw_add(f00, step_y_left, num_attributes);
sw_add(f10, step_y_right, num_attributes);
}
} else {
SWint ix, iy;
for (iy = y; iy <= y1; iy++) {
SWint Cx1 = Cy1_00, Cx2 = Cy2_00, Cx3 = Cy3_00;
SWint attr;
for (attr = 0; attr < num_attributes; attr++) {
vs_interpolated[attr] = f00[attr];
step_x[i] = (f10[attr] - f00[attr]) * SW_INV_TILE_STEP;
}
for (ix = x; ix <= x1; ix++) {
if (Cx1 > 0 && Cx2 > 0 && Cx3 > 0) {
_swProcessPixel_fast(p, f, ix, iy, vs_interpolated,
depth_test, b_depth_write, b_blend);
}
sw_add(vs_interpolated, step_x, num_attributes);
Cx1 -= d01[1];
Cx2 -= d12[1];
Cx3 -= d20[1];
}
sw_add(f00, step_y_left, num_attributes);
sw_add(f10, step_y_right, num_attributes);
Cy1_00 += d01[0];
Cy2_00 += d12[0];
Cy3_00 += d20[0];
}
}
}
}
}
#define PLANE_DOT(x, y) \
((x)[0] * (y)[0] + (x)[1] * (y)[1] + (x)[2] * (y)[2] + (x)[3] * (y)[3])
#define DIFFERENT_SIGNS(x, y) (((x) <= 0 && (y) > 0) || ((x) > 0 && (y) <= 0))
#define LERP(x, y, t) ((y) + ((x) - (y)) * (t))
sw_inline SWint _swClipAndTransformToNDC_Line(SWfloat vs_in[2][SW_MAX_VTX_ATTRIBS],
SWfloat vs_out[2][SW_MAX_VTX_ATTRIBS],
const SWint num_attrs,
const SWint num_corr_attrs) {
SWfloat clip_planes[6][4] = {{-1, 0, 0, 1}, /* pos x */
{1, 0, 0, 1}, /* neg x */
{0, -1, 0, 1}, /* pos y */
{0, 1, 0, 1}, /* neg y */
{0, 0, -1, 1}, /* pos z */
{0, 0, 0, 1}}; /* neg z */
SWint clip_plane_bits[6] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20};
SWint clip_mask = 0;
SWint i, j;
for (i = 0; i < 2; i++) {
for (j = 0; j < 6; j++) {
if (PLANE_DOT(vs_in[i], clip_planes[j]) < 0)
clip_mask |= clip_plane_bits[j];
}
}
SWfloat t0 = 0, t1 = 0;
for (i = 0; i < 6; i++) {
if (clip_mask & clip_plane_bits[i]) {
const SWfloat dp0 = PLANE_DOT(vs_in[0], clip_planes[i]);
const SWfloat dp1 = PLANE_DOT(vs_in[1], clip_planes[i]);
if (dp0 < 0 && dp1 < 0) {
return 0;
}
if (dp1 < 0) {
SWfloat t = dp1 / (dp1 - dp0);
if (t > t1)
t1 = t;
} else if (dp0 < 0) {
SWfloat t = dp0 / (dp0 - dp1);
if (t > t0)
t0 = t;
}
if (t0 + t1 >= 1) {
return 0;
}
}
}
SWint ii;
if (clip_mask || vs_in != vs_out) {
for (ii = 0; ii < num_attrs; ii++) {
SWfloat f1 = vs_in[0][ii], f2 = vs_in[1][ii];
vs_out[0][ii] = LERP(f2, f1, t0);
vs_out[1][ii] = LERP(f1, f2, t1);
}
}
for (i = 0; i < 2; i++) {
SWfloat inv_posw = 1 / vs_out[i][3];
for (ii = 0; ii < num_corr_attrs; ii++) {
vs_out[i][ii] *= inv_posw;
}
vs_out[i][3] = inv_posw;
}
return 1;
}
sw_inline SWint _swClipAndTransformToNDC_Tri(SWfloat vs_in[][SW_MAX_VTX_ATTRIBS],
SWfloat vs_out[16][SW_MAX_VTX_ATTRIBS],
SWint _0, SWint _1, SWint _2,
SWint out_verts[16], SWint num_attrs,
SWint num_corr_attrs) {
const SWfloat clip_planes[6][4] = {{-1, 0, 0, 1}, {1, 0, 0, 1}, {0, -1, 0, 1},
{0, 1, 0, 1}, {0, 0, -1, 1}, {0, 0, 0, 1}};
const SWint clip_plane_bits[6] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20};
SWint clip_mask = 0, num_verts = 3;
SWint i, j;
for (i = 0; i < 3; i++) {
for (j = 0; j < 6; j++) {
if (PLANE_DOT(vs_in[i], clip_planes[j]) < -0.01f)
clip_mask |= clip_plane_bits[j];
}
}
if (vs_in != vs_out) {
for (i = 0; i < 3; i++) {
for (j = 0; j < num_attrs; j++) {
vs_out[i][j] = vs_in[i][j];
}
}
}
SWint list1[16] = {_0, _1, _2};
SWint *in_list = list1, *out_list = out_verts;
SWint n = num_verts;
#define EMIT_VERTEX(ndx1, ndx2, t) \
{ \
SWint ii; \
for (ii = 0; ii < num_attrs; ii++) { \
vs_out[num_verts][ii] = LERP(vs_out[ndx1][ii], vs_out[ndx2][ii], t); \
} \
num_verts++; \
}
for (i = 0; i < 6; i++) {
if (clip_mask & clip_plane_bits[i]) {
SWint out_count = 0;
SWint ndx_prev = in_list[0];
SWfloat dp_prev = PLANE_DOT(vs_out[ndx_prev], clip_planes[i]);
in_list[n] = in_list[0];
for (j = 1; j <= n; j++) {
SWint ndx = in_list[j];
SWfloat dp = PLANE_DOT(vs_out[ndx], clip_planes[i]);
if (dp_prev >= 0) {
out_list[out_count++] = ndx_prev;
}
if (DIFFERENT_SIGNS(dp, dp_prev)) {
if (dp < 0) {
SWfloat t = dp / (dp - dp_prev);
EMIT_VERTEX(ndx_prev, ndx, t);
} else {
SWfloat t = dp_prev / (dp_prev - dp);
EMIT_VERTEX(ndx, ndx_prev, t);
}
out_list[out_count++] = num_verts - 1;
}
ndx_prev = ndx;
dp_prev = dp;
}
if (out_count < 3) {
return 0;
}
sw_swap(in_list, out_list, SWint *);
n = out_count;
}
}
if (in_list != out_verts) {
for (i = 0; i < n; i++) {
out_verts[i] = in_list[i];