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implement 3D texture sampling

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This commit is contained in:
Brian 2007-10-17 14:13:21 -06:00
parent 7392dac962
commit 3d6f9d904f
1 changed files with 111 additions and 1 deletions
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112
src/mesa/pipe/softpipe/sp_tex_sample.c
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@ -697,7 +697,6 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler,
if (level0 != level1) {
/* get texels from second mipmap level and blend */
float rgba2[4][4];
unsigned c;
x0 = x0 / 2;
y0 = y0 / 2;
x1 = x1 / 2;
@ -759,6 +758,117 @@ sp_get_samples_3d(struct tgsi_sampler *sampler,
float rgba[NUM_CHANNELS][QUAD_SIZE])
{
/* get/map pipe_surfaces corresponding to 3D tex slices */
unsigned level0, level1, j, imgFilter;
int width, height, depth;
float levelBlend;
const uint face = 0;
choose_mipmap_levels(sampler, s, t, p, lodbias,
&level0, &level1, &levelBlend, &imgFilter);
if (sampler->state->normalized_coords) {
width = sampler->texture->level[level0].width;
height = sampler->texture->level[level0].height;
depth = sampler->texture->level[level0].depth;
}
else {
width = height = depth = 1.0;
}
assert(width > 0);
assert(height > 0);
assert(depth > 0);
switch (imgFilter) {
case PIPE_TEX_FILTER_NEAREST:
for (j = 0; j < QUAD_SIZE; j++) {
int x = nearest_texcoord(sampler->state->wrap_s, s[j], width);
int y = nearest_texcoord(sampler->state->wrap_t, t[j], height);
int z = nearest_texcoord(sampler->state->wrap_r, p[j], depth);
get_texel(sampler, face, level0, z, x, y, rgba, j);
if (level0 != level1) {
/* get texels from second mipmap level and blend */
float rgba2[4][4];
unsigned c;
x /= 2;
y /= 2;
z /= 2;
get_texel(sampler, face, level1, z, x, y, rgba2, j);
for (c = 0; c < NUM_CHANNELS; c++) {
rgba[c][j] = LERP(levelBlend, rgba2[c][j], rgba[c][j]);
}
}
}
break;
case PIPE_TEX_FILTER_LINEAR:
for (j = 0; j < QUAD_SIZE; j++) {
float texel0[4][4], texel1[4][4], xw, yw, zw;
int x0, x1, y0, y1, z0, z1, c;
linear_texcoord(sampler->state->wrap_s, s[j], width, &x0, &x1, &xw);
linear_texcoord(sampler->state->wrap_t, t[j], height, &y0, &y1, &yw);
linear_texcoord(sampler->state->wrap_r, p[j], depth, &z0, &z1, &zw);
get_texel(sampler, face, level0, z0, x0, y0, texel0, 0);
get_texel(sampler, face, level0, z0, x1, y0, texel0, 1);
get_texel(sampler, face, level0, z0, x0, y1, texel0, 2);
get_texel(sampler, face, level0, z0, x1, y1, texel0, 3);
get_texel(sampler, face, level0, z1, x0, y0, texel1, 0);
get_texel(sampler, face, level0, z1, x1, y0, texel1, 1);
get_texel(sampler, face, level0, z1, x0, y1, texel1, 2);
get_texel(sampler, face, level0, z1, x1, y1, texel1, 3);
/* 3D lerp */
for (c = 0; c < 4; c++) {
float ctemp0[4][4], ctemp1[4][4];
ctemp0[c][j] = lerp_2d(xw, yw,
texel0[c][0], texel0[c][1],
texel0[c][2], texel0[c][3]);
ctemp1[c][j] = lerp_2d(xw, yw,
texel1[c][0], texel1[c][1],
texel1[c][2], texel1[c][3]);
rgba[c][j] = LERP(zw, ctemp0[c][j], ctemp1[c][j]);
}
if (level0 != level1) {
/* get texels from second mipmap level and blend */
float rgba2[4][4];
x0 /= 2;
y0 /= 2;
z0 /= 2;
x1 /= 2;
y1 /= 2;
z1 /= 2;
get_texel(sampler, face, level1, z0, x0, y0, texel0, 0);
get_texel(sampler, face, level1, z0, x1, y0, texel0, 1);
get_texel(sampler, face, level1, z0, x0, y1, texel0, 2);
get_texel(sampler, face, level1, z0, x1, y1, texel0, 3);
get_texel(sampler, face, level1, z1, x0, y0, texel1, 0);
get_texel(sampler, face, level1, z1, x1, y0, texel1, 1);
get_texel(sampler, face, level1, z1, x0, y1, texel1, 2);
get_texel(sampler, face, level1, z1, x1, y1, texel1, 3);
/* 3D lerp */
for (c = 0; c < 4; c++) {
float ctemp0[4][4], ctemp1[4][4];
ctemp0[c][j] = lerp_2d(xw, yw,
texel0[c][0], texel0[c][1],
texel0[c][2], texel0[c][3]);
ctemp1[c][j] = lerp_2d(xw, yw,
texel1[c][0], texel1[c][1],
texel1[c][2], texel1[c][3]);
rgba2[c][j] = LERP(zw, ctemp0[c][j], ctemp1[c][j]);
}
/* blend mipmap levels */
for (c = 0; c < NUM_CHANNELS; c++) {
rgba[c][j] = LERP(levelBlend, rgba[c][j], rgba2[c][j]);
}
}
}
break;
default:
assert(0);
}
}