From b1c8fa5b6002296d9abe21c06d5cb81a3f70828a Mon Sep 17 00:00:00 2001 From: Brian Date: Tue, 19 Feb 2008 14:55:18 -0700 Subject: gallium: implement correct sampling for RECT targets / unnormalized texcoords --- src/gallium/drivers/softpipe/sp_tex_sample.c | 168 +++++++++++++++++++++++---- 1 file changed, 143 insertions(+), 25 deletions(-) (limited to 'src/gallium/drivers/softpipe/sp_tex_sample.c') diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c index c54e9d385c..ff872f360e 100644 --- a/src/gallium/drivers/softpipe/sp_tex_sample.c +++ b/src/gallium/drivers/softpipe/sp_tex_sample.c @@ -332,6 +332,61 @@ linear_texcoord(unsigned wrapMode, float s, unsigned size, } +/** + * For RECT textures / unnormalized texcoords + * Only a subset of wrap modes supported. + */ +static INLINE int +nearest_texcoord_unnorm(unsigned wrapMode, float s, unsigned size) +{ + int i; + switch (wrapMode) { + case PIPE_TEX_WRAP_CLAMP: + i = ifloor(s); + return CLAMP(i, 0, size-1); + case PIPE_TEX_WRAP_CLAMP_TO_EDGE: + /* fall-through */ + case PIPE_TEX_WRAP_CLAMP_TO_BORDER: + return ifloor( CLAMP(s, 0.5F, size - 0.5F) ); + default: + assert(0); + return 0; + } +} + + +/** + * For RECT textures / unnormalized texcoords. + * Only a subset of wrap modes supported. + */ +static INLINE void +linear_texcoord_unnorm(unsigned wrapMode, float s, unsigned size, + int *i0, int *i1, float *a) +{ + switch (wrapMode) { + case PIPE_TEX_WRAP_CLAMP: + /* Not exactly what the spec says, but it matches NVIDIA output */ + s = CLAMP(s - 0.5F, 0.0, size - 1.0); + *i0 = ifloor(s); + *i1 = *i0 + 1; + break; + case PIPE_TEX_WRAP_CLAMP_TO_EDGE: + /* fall-through */ + case PIPE_TEX_WRAP_CLAMP_TO_BORDER: + s = CLAMP(s, 0.5F, size - 0.5F); + s -= 0.5F; + *i0 = ifloor(s); + *i1 = *i0 + 1; + if (*i1 > size - 1) + *i1 = size - 1; + break; + default: + assert(0); + } + *a = FRAC(s); +} + + static unsigned choose_cube_face(float rx, float ry, float rz, float *newS, float *newT) { @@ -415,15 +470,15 @@ compute_lambda(struct tgsi_sampler *sampler, { float rho, lambda; + assert(sampler->state->normalized_coords); + assert(s); { float dsdx = s[QUAD_BOTTOM_RIGHT] - s[QUAD_BOTTOM_LEFT]; float dsdy = s[QUAD_TOP_LEFT] - s[QUAD_BOTTOM_LEFT]; dsdx = FABSF(dsdx); dsdy = FABSF(dsdy); - rho = MAX2(dsdx, dsdy); - if (sampler->state->normalized_coords) - rho *= sampler->texture->width[0]; + rho = MAX2(dsdx, dsdy) * sampler->texture->width[0]; } if (t) { float dtdx = t[QUAD_BOTTOM_RIGHT] - t[QUAD_BOTTOM_LEFT]; @@ -431,9 +486,7 @@ compute_lambda(struct tgsi_sampler *sampler, float max; dtdx = FABSF(dtdx); dtdy = FABSF(dtdy); - max = MAX2(dtdx, dtdy); - if (sampler->state->normalized_coords) - max *= sampler->texture->height[0]; + max = MAX2(dtdx, dtdy) * sampler->texture->height[0]; rho = MAX2(rho, max); } if (p) { @@ -442,9 +495,7 @@ compute_lambda(struct tgsi_sampler *sampler, float max; dpdx = FABSF(dpdx); dpdy = FABSF(dpdy); - max = MAX2(dpdx, dpdy); - if (sampler->state->normalized_coords) - max *= sampler->texture->depth[0]; + max = MAX2(dpdx, dpdy) * sampler->texture->depth[0]; rho = MAX2(rho, max); } @@ -628,13 +679,10 @@ sp_get_samples_2d_common(struct tgsi_sampler *sampler, choose_mipmap_levels(sampler, s, t, p, lodbias, &level0, &level1, &levelBlend, &imgFilter); - if (sampler->state->normalized_coords) { - width = sampler->texture->width[level0]; - height = sampler->texture->height[level0]; - } - else { - width = height = 1; - } + assert(sampler->state->normalized_coords); + + width = sampler->texture->width[level0]; + height = sampler->texture->height[level0]; assert(width > 0); @@ -765,14 +813,11 @@ sp_get_samples_3d(struct tgsi_sampler *sampler, choose_mipmap_levels(sampler, s, t, p, lodbias, &level0, &level1, &levelBlend, &imgFilter); - if (sampler->state->normalized_coords) { - width = sampler->texture->width[level0]; - height = sampler->texture->height[level0]; - depth = sampler->texture->depth[level0]; - } - else { - width = height = depth = 1; - } + assert(sampler->state->normalized_coords); + + width = sampler->texture->width[level0]; + height = sampler->texture->height[level0]; + depth = sampler->texture->depth[level0]; assert(width > 0); assert(height > 0); @@ -889,6 +934,73 @@ sp_get_samples_cube(struct tgsi_sampler *sampler, } +static void +sp_get_samples_rect(struct tgsi_sampler *sampler, + const float s[QUAD_SIZE], + const float t[QUAD_SIZE], + const float p[QUAD_SIZE], + float lodbias, + float rgba[NUM_CHANNELS][QUAD_SIZE]) +{ + //sp_get_samples_2d_common(sampler, s, t, p, lodbias, rgba, faces); + static const uint face = 0; + const uint compare_func = sampler->state->compare_func; + unsigned level0, level1, j, imgFilter; + int width, height; + float levelBlend; + + choose_mipmap_levels(sampler, s, t, p, lodbias, + &level0, &level1, &levelBlend, &imgFilter); + + /* texture RECTS cannot be mipmapped */ + assert(level0 == level1); + + width = sampler->texture->width[level0]; + height = sampler->texture->height[level0]; + + assert(width > 0); + + switch (imgFilter) { + case PIPE_TEX_FILTER_NEAREST: + for (j = 0; j < QUAD_SIZE; j++) { + int x = nearest_texcoord_unnorm(sampler->state->wrap_s, s[j], width); + int y = nearest_texcoord_unnorm(sampler->state->wrap_t, t[j], height); + get_texel(sampler, face, level0, x, y, 0, rgba, j); + if (sampler->state->compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) { + shadow_compare(compare_func, rgba, p, j); + } + } + break; + case PIPE_TEX_FILTER_LINEAR: + for (j = 0; j < QUAD_SIZE; j++) { + float tx[4][4], a, b; + int x0, y0, x1, y1, c; + linear_texcoord_unnorm(sampler->state->wrap_s, s[j], width, &x0, &x1, &a); + linear_texcoord_unnorm(sampler->state->wrap_t, t[j], height, &y0, &y1, &b); + get_texel(sampler, face, level0, x0, y0, 0, tx, 0); + get_texel(sampler, face, level0, x1, y0, 0, tx, 1); + get_texel(sampler, face, level0, x0, y1, 0, tx, 2); + get_texel(sampler, face, 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]); + } + } + break; + default: + assert(0); + } +} + + + + /** * Called via tgsi_sampler::get_samples() * Use the sampler's state setting to get a filtered RGBA value @@ -914,15 +1026,21 @@ sp_get_samples(struct tgsi_sampler *sampler, switch (sampler->texture->target) { case PIPE_TEXTURE_1D: + assert(sampler->state->normalized_coords); sp_get_samples_1d(sampler, s, t, p, lodbias, rgba); break; case PIPE_TEXTURE_2D: - sp_get_samples_2d(sampler, s, t, p, lodbias, rgba); + if (sampler->state->normalized_coords) + sp_get_samples_2d(sampler, s, t, p, lodbias, rgba); + else + sp_get_samples_rect(sampler, s, t, p, lodbias, rgba); break; case PIPE_TEXTURE_3D: + assert(sampler->state->normalized_coords); sp_get_samples_3d(sampler, s, t, p, lodbias, rgba); break; case PIPE_TEXTURE_CUBE: + assert(sampler->state->normalized_coords); sp_get_samples_cube(sampler, s, t, p, lodbias, rgba); break; default: -- cgit v1.2.3