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gallium: add a cull distance semantic

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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 <zackr@vmware.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Zack Rusin 2013-06-06 09:04:11 -04:00
parent 0a3779d955
commit 3d08eada34
5 changed files with 20 additions and 2 deletions
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4
src/gallium/auxiliary/tgsi/tgsi_scan.c
View file

@ -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)

1
src/gallium/auxiliary/tgsi/tgsi_scan.h
View file

@ -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

3
src/gallium/auxiliary/tgsi/tgsi_strings.c
View file

@ -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] =

11
src/gallium/docs/source/tgsi.rst
View file

@ -2425,6 +2425,17 @@ contains the layer value to use for the color and depth/stencil surfaces.
Only the X value is used. (Also known as rendertarget array index.)
TGSI_SEMANTIC_CULLDIST
""""""""""""""""""""""
Used as distance to plane for performing application-defined culling
of individual primitives against a plane. When components of vertex
elements are given this label, these values are assumed to be a
float32 signed distance to a plane. Primitives will be completely
discarded if the plane distance for all of the vertices in the
primitive are < 0. If a vertex has a cull distance of NaN, that
vertex counts as "out" (as if its < 0);
Declaration Interpolate
^^^^^^^^^^^^^^^^^^^^^^^

3
src/gallium/include/pipe/p_shader_tokens.h
View file

@ -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
{