diff options
Diffstat (limited to 'src/mesa/pipe/softpipe/sp_tex_sample.c')
| -rw-r--r-- | src/mesa/pipe/softpipe/sp_tex_sample.c | 68 |
1 files changed, 67 insertions, 1 deletions
diff --git a/src/mesa/pipe/softpipe/sp_tex_sample.c b/src/mesa/pipe/softpipe/sp_tex_sample.c index e3e607d27c..92958400fc 100644 --- a/src/mesa/pipe/softpipe/sp_tex_sample.c +++ b/src/mesa/pipe/softpipe/sp_tex_sample.c @@ -553,6 +553,50 @@ get_texel(struct tgsi_sampler *sampler, } +/** + * Compare texcoord 'p' (aka R) against texture value 'rgba[0]' + * When we sampled the depth texture, the depth value was put into all + * RGBA channels. We look at the red channel here. + */ +static INLINE void +shadow_compare(uint compare_func, + float rgba[NUM_CHANNELS][QUAD_SIZE], + const float p[QUAD_SIZE], + uint j) +{ + int k; + switch (compare_func) { + case PIPE_FUNC_LESS: + k = p[j] < rgba[0][j]; + break; + case PIPE_FUNC_LEQUAL: + k = p[j] <= rgba[0][j]; + break; + case PIPE_FUNC_GREATER: + k = p[j] > rgba[0][j]; + break; + case PIPE_FUNC_GEQUAL: + k = p[j] >= rgba[0][j]; + break; + case PIPE_FUNC_EQUAL: + k = p[j] == rgba[0][j]; + break; + case PIPE_FUNC_NOTEQUAL: + k = p[j] != rgba[0][j]; + break; + case PIPE_FUNC_ALWAYS: + k = 1; + break; + case PIPE_FUNC_NEVER: + k = 0; + break; + default: + assert(0); + } + + rgba[0][j] = rgba[1][j] = rgba[2][j] = (float) k; +} + /** * Common code for sampling 1D/2D/cube textures. @@ -567,6 +611,7 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler, float rgba[NUM_CHANNELS][QUAD_SIZE], const unsigned faces[4]) { + const uint compare_func = sampler->state->compare_func; unsigned level0, level1, j, imgFilter; int width, height; float levelBlend; @@ -590,6 +635,9 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler, int x = nearest_texcoord(sampler->state->wrap_s, s[j], width); int y = nearest_texcoord(sampler->state->wrap_t, t[j], height); get_texel(sampler, faces[j], level0, x, y, 0, rgba, j); + if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) { + shadow_compare(compare_func, rgba, p, j); + } if (level0 != level1) { /* get texels from second mipmap level and blend */ @@ -598,6 +646,10 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler, x = x / 2; y = y / 2; get_texel(sampler, faces[j], level1, x, y, 0, rgba2, j); + if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){ + shadow_compare(compare_func, rgba2, p, j); + } + for (c = 0; c < NUM_CHANNELS; c++) { rgba[c][j] = LERP(levelBlend, rgba[c][j], rgba2[c][j]); } @@ -614,6 +666,13 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler, get_texel(sampler, faces[j], level0, x1, y0, 0, tx, 1); get_texel(sampler, faces[j], level0, x0, y1, 0, tx, 2); get_texel(sampler, faces[j], level0, x1, y1, 0, tx, 3); + if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) { + shadow_compare(compare_func, tx, p, 0); + shadow_compare(compare_func, tx, p, 1); + shadow_compare(compare_func, tx, p, 2); + shadow_compare(compare_func, tx, p, 3); + } + for (c = 0; c < 4; c++) { rgba[c][j] = lerp_2d(a, b, tx[c][0], tx[c][1], tx[c][2], tx[c][3]); } @@ -629,6 +688,13 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler, get_texel(sampler, faces[j], level1, x1, y0, 0, tx, 1); get_texel(sampler, faces[j], level1, x0, y1, 0, tx, 2); get_texel(sampler, faces[j], level1, x1, y1, 0, tx, 3); + if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){ + shadow_compare(compare_func, tx, p, 0); + shadow_compare(compare_func, tx, p, 1); + shadow_compare(compare_func, tx, p, 2); + shadow_compare(compare_func, tx, p, 3); + } + for (c = 0; c < 4; c++) { rgba2[c][j] = lerp_2d(a, b, tx[c][0], tx[c][1], tx[c][2], tx[c][3]); @@ -669,7 +735,7 @@ sp_get_samples_2d(struct tgsi_sampler *sampler, float rgba[NUM_CHANNELS][QUAD_SIZE]) { static const unsigned faces[4] = {0, 0, 0, 0}; - sp_get_samples_2d_common(sampler, s, t, NULL, lodbias, rgba, faces); + sp_get_samples_2d_common(sampler, s, t, p, lodbias, rgba, faces); } |