cull distance is analogous to clip distance. If a register is
given this semantic, then the values in it are assumed to be a
float32 distance to a plane. Primitives will be completely
discarded if the plane distance for all of the vertices in
the primitive are < 0.
Signed-off-by: Zack Rusin <za...@vmware.com>
---
src/gallium/auxiliary/tgsi/tgsi_scan.c | 4 ++++
src/gallium/auxiliary/tgsi/tgsi_scan.h | 1 +
src/gallium/auxiliary/tgsi/tgsi_strings.c | 3 ++-
src/gallium/include/pipe/p_shader_tokens.h | 3 ++-
4 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c
b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index 872e4ff..2a37b38 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -200,6 +200,10 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
fulldecl->Semantic.Name == TGSI_SEMANTIC_CLIPDIST) {
info->num_written_clipdistance +=
util_bitcount(fulldecl->Declaration.UsageMask);
}
+ if ((procType == TGSI_PROCESSOR_VERTEX || procType ==
TGSI_PROCESSOR_GEOMETRY) &&
+ fulldecl->Semantic.Name == TGSI_SEMANTIC_CULLDIST) {
+ info->num_written_culldistance +=
util_bitcount(fulldecl->Declaration.UsageMask);
+ }
/* extra info for special outputs */
if (procType == TGSI_PROCESSOR_FRAGMENT &&
fulldecl->Semantic.Name == TGSI_SEMANTIC_POSITION)
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h
b/src/gallium/auxiliary/tgsi/tgsi_scan.h
index a5b7024..91eef67 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
@@ -78,6 +78,7 @@ struct tgsi_shader_info
boolean writes_viewport_index;
boolean writes_layer;
+ unsigned num_written_culldistance;
unsigned num_written_clipdistance;
/**
* Bitmask indicating which register files are accessed with
diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c
b/src/gallium/auxiliary/tgsi/tgsi_strings.c
index 2785676..6f244e5 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
@@ -80,7 +80,8 @@ const char *tgsi_semantic_names[TGSI_SEMANTIC_COUNT] =
"TEXCOORD",
"PCOORD",
"VIEWPORT_INDEX",
- "LAYER"
+ "LAYER",
+ "CULLDIST"
};
const char *tgsi_texture_names[TGSI_TEXTURE_COUNT] =
diff --git a/src/gallium/include/pipe/p_shader_tokens.h
b/src/gallium/include/pipe/p_shader_tokens.h
index c984d50..4a6a57f 100644
--- a/src/gallium/include/pipe/p_shader_tokens.h
+++ b/src/gallium/include/pipe/p_shader_tokens.h
@@ -166,7 +166,8 @@ struct tgsi_declaration_interp
#define TGSI_SEMANTIC_PCOORD 20 /**< point sprite coordinate */
#define TGSI_SEMANTIC_VIEWPORT_INDEX 21 /**< viewport index */
#define TGSI_SEMANTIC_LAYER 22 /**< layer (rendertarget index) */
-#define TGSI_SEMANTIC_COUNT 23 /**< number of semantic values */
+#define TGSI_SEMANTIC_CULLDIST 23
+#define TGSI_SEMANTIC_COUNT 24 /**< number of semantic values */
struct tgsi_declaration_semantic
{
--
1.7.10.4
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