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authorBrian Paul <brianp@vmware.com>2010-03-05 16:52:11 -0700
committerBrian Paul <brianp@vmware.com>2010-03-05 16:52:11 -0700
commit1a0a2b64ca150a97c96da2d4d97189c233dce407 (patch)
treeb3e3a9ba358970a6f6ae23ce927c908eada5e530
parentb5038fdd65535012086535c6a87bc56c91a65c87 (diff)
gallivm: checkpoint: code gen for mipmap selection
-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c65
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 6b643fa85f..bc2f307c33 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);