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gallivm: checkpoint: code gen for mipmap selection

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This commit is contained in:
Brian Paul
2010-03-05 16:52:11 -07:00
parent b5038fdd65
commit 1a0a2b64ca
1 changed files with 65 additions and 0 deletions
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src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
+65
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@@ -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);