diff options
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c index 6b643fa85f8..bc2f307c33b 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c @@ -1159,6 +1159,69 @@ lp_build_lod_selector(struct lp_build_sample_context *bld, } +/** + * For PIPE_TEX_MIPFILTER_NEAREST, convert float LOD to integer + * mipmap level index. + * \param lod scalar float texture level of detail + * \param level_out returns integer + */ +static void +lp_build_nearest_mip_level(struct lp_build_sample_context *bld, + unsigned unit, + LLVMValueRef lod, + LLVMValueRef *level_out) +{ + struct lp_build_context *coord_bld = &bld->coord_bld; + struct lp_build_context *int_coord_bld = &bld->int_coord_bld; + LLVMValueRef last_level, level; + + last_level = bld->dynamic_state->last_level(bld->dynamic_state, + bld->builder, unit); + + /* convert float lod to integer */ + level = lp_build_iround(coord_bld, lod); + + /* clamp level to legal range of levels */ + *level_out = lp_build_clamp(int_coord_bld, level, + int_coord_bld->zero, + last_level); +} + + +/** + * For PIPE_TEX_MIPFILTER_LINEAR, convert float LOD to integer to + * two (adjacent) mipmap level indexes. Later, we'll sample from those + * two mipmap levels and interpolate between them. + */ +static void +lp_build_linear_mip_levels(struct lp_build_sample_context *bld, + unsigned unit, + LLVMValueRef lod, + LLVMValueRef *level0_out, + LLVMValueRef *level1_out, + LLVMValueRef *weight_out) +{ + struct lp_build_context *coord_bld = &bld->coord_bld; + struct lp_build_context *int_coord_bld = &bld->int_coord_bld; + LLVMValueRef last_level, level; + + last_level = bld->dynamic_state->last_level(bld->dynamic_state, + bld->builder, unit); + + /* convert float lod to integer */ + level = lp_build_ifloor(coord_bld, lod); + + /* compute level 0 and clamp to legal range of levels */ + *level0_out = lp_build_clamp(int_coord_bld, level, + int_coord_bld->zero, + last_level); + /* compute level 1 and clamp to legal range of levels */ + *level1_out = lp_build_add(int_coord_bld, *level0_out, int_coord_bld->one); + *level1_out = lp_build_min(int_coord_bld, *level1_out, int_coord_bld->zero); + + *weight_out = lp_build_fract(coord_bld, lod); +} + /** @@ -1187,6 +1250,8 @@ lp_build_sample_soa(LLVMBuilderRef builder, LLVMValueRef r; (void) lp_build_lod_selector; /* temporary to silence warning */ + (void) lp_build_nearest_mip_level; + (void) lp_build_linear_mip_levels; /* Setup our build context */ memset(&bld, 0, sizeof bld); |