diff options
| -rw-r--r-- | src/gallium/drivers/softpipe/sp_tex_sample.c | 90 |
1 files changed, 78 insertions, 12 deletions
diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c index 6af0fcb92d5..a1d3bade27a 100644 --- a/src/gallium/drivers/softpipe/sp_tex_sample.c +++ b/src/gallium/drivers/softpipe/sp_tex_sample.c @@ -705,6 +705,9 @@ get_texel(const struct tgsi_sampler *tgsi_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. + * \param rgba quad of (depth) texel values + * \param p texture 'P' components for four pixels in quad + * \param j which pixel in the quad to test [0..3] */ static INLINE void shadow_compare(const struct pipe_sampler_state *sampler, @@ -751,6 +754,78 @@ shadow_compare(const struct pipe_sampler_state *sampler, /** + * As above, but do four z/texture comparisons. + */ +static INLINE void +shadow_compare4(const struct pipe_sampler_state *sampler, + float rgba[NUM_CHANNELS][QUAD_SIZE], + const float p[QUAD_SIZE]) +{ + int j, k0, k1, k2, k3; + float val; + + /* compare four texcoords vs. four texture samples */ + switch (sampler->compare_func) { + case PIPE_FUNC_LESS: + k0 = p[0] < rgba[0][0]; + k1 = p[1] < rgba[0][1]; + k2 = p[2] < rgba[0][2]; + k3 = p[3] < rgba[0][3]; + break; + case PIPE_FUNC_LEQUAL: + k0 = p[0] <= rgba[0][0]; + k1 = p[1] <= rgba[0][1]; + k2 = p[2] <= rgba[0][2]; + k3 = p[3] <= rgba[0][3]; + break; + case PIPE_FUNC_GREATER: + k0 = p[0] > rgba[0][0]; + k1 = p[1] > rgba[0][1]; + k2 = p[2] > rgba[0][2]; + k3 = p[3] > rgba[0][3]; + break; + case PIPE_FUNC_GEQUAL: + k0 = p[0] >= rgba[0][0]; + k1 = p[1] >= rgba[0][1]; + k2 = p[2] >= rgba[0][2]; + k3 = p[3] >= rgba[0][3]; + break; + case PIPE_FUNC_EQUAL: + k0 = p[0] == rgba[0][0]; + k1 = p[1] == rgba[0][1]; + k2 = p[2] == rgba[0][2]; + k3 = p[3] == rgba[0][3]; + break; + case PIPE_FUNC_NOTEQUAL: + k0 = p[0] != rgba[0][0]; + k1 = p[1] != rgba[0][1]; + k2 = p[2] != rgba[0][2]; + k3 = p[3] != rgba[0][3]; + break; + case PIPE_FUNC_ALWAYS: + k0 = k1 = k2 = k3 = 1; + break; + case PIPE_FUNC_NEVER: + k0 = k1 = k2 = k3 = 0; + break; + default: + k0 = k1 = k2 = k3 = 0; + assert(0); + break; + } + + /* convert four pass/fail values to an intensity in [0,1] */ + val = 0.25F * (k0 + k1 + k2 + k3); + + /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */ + for (j = 0; j < 4; j++) { + rgba[0][j] = rgba[1][j] = rgba[2][j] = val; + rgba[3][j] = 1.0F; + } +} + + +/** * Common code for sampling 1D/2D/cube textures. * Could probably extend for 3D... */ @@ -832,10 +907,7 @@ sp_get_samples_2d_common(const struct tgsi_sampler *tgsi_sampler, get_texel(tgsi_sampler, faces[j], level0, x0[j], y1[j], 0, tx, 2); get_texel(tgsi_sampler, faces[j], level0, x1[j], y1[j], 0, tx, 3); if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) { - shadow_compare(sampler, tx, p, 0); - shadow_compare(sampler, tx, p, 1); - shadow_compare(sampler, tx, p, 2); - shadow_compare(sampler, tx, p, 3); + shadow_compare4(sampler, tx, p); } /* interpolate R, G, B, A */ @@ -857,10 +929,7 @@ sp_get_samples_2d_common(const struct tgsi_sampler *tgsi_sampler, get_texel(tgsi_sampler, faces[j], level1, x0[j], y1[j], 0, tx, 2); get_texel(tgsi_sampler, faces[j], level1, x1[j], y1[j], 0, tx, 3); if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE){ - shadow_compare(sampler, tx, p, 0); - shadow_compare(sampler, tx, p, 1); - shadow_compare(sampler, tx, p, 2); - shadow_compare(sampler, tx, p, 3); + shadow_compare4(sampler, tx, p); } /* interpolate R, G, B, A */ @@ -1119,10 +1188,7 @@ sp_get_samples_rect(const struct tgsi_sampler *tgsi_sampler, get_texel(tgsi_sampler, face, level0, x0[j], y1[j], 0, tx, 2); get_texel(tgsi_sampler, face, level0, x1[j], y1[j], 0, tx, 3); if (sampler->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) { - shadow_compare(sampler, tx, p, 0); - shadow_compare(sampler, tx, p, 1); - shadow_compare(sampler, tx, p, 2); - shadow_compare(sampler, tx, p, 3); + shadow_compare4(sampler, tx, p); } for (c = 0; c < 4; c++) { rgba[c][j] = lerp_2d(xw[j], yw[j], |