diff options
| -rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_strings.c | 1 | ||||
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 22 | ||||
| -rw-r--r-- | src/gallium/include/pipe/p_shader_tokens.h | 1 |
3 files changed, 18 insertions, 6 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c b/src/gallium/auxiliary/tgsi/tgsi_strings.c index 306ab4fefa8..c13f7eaecca 100644 --- a/src/gallium/auxiliary/tgsi/tgsi_strings.c +++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c @@ -85,7 +85,6 @@ const char *tgsi_semantic_names[TGSI_SEMANTIC_COUNT] = "PCOORD", "VIEWPORT_INDEX", "LAYER", - "CULLDIST", "SAMPLEID", "SAMPLEPOS", "SAMPLEMASK", diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index 4315707e643..ab12490fb5f 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -2876,18 +2876,32 @@ annotated with those semantics. TGSI_SEMANTIC_CLIPDIST """""""""""""""""""""" +Note this covers clipping and culling distances. + When components of vertex elements are identified this way, these values are each assumed to be a float32 signed distance to a plane. + +For clip distances: Primitive setup only invokes rasterization on pixels for which -the interpolated plane distances are >= 0. Multiple clip planes -can be implemented simultaneously, by annotating multiple -components of one or more vertex elements with the above specified -semantic. The limits on both clip and cull distances are bound +the interpolated plane distances are >= 0. + +For cull distances: +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); + +Multiple clip/cull planes can be implemented simultaneously, by +annotating multiple components of one or more vertex elements with +the above specified semantic. +The limits on both clip and cull distances are bound by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_COUNT define which defines the maximum number of components that can be used to hold the distances and by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT which specifies the maximum number of registers which can be annotated with those semantics. +The properties NUM_CLIPDIST_ENABLED and NUM_CULLDIST_ENABLED +are used to divide up the 2 x vec4 space between clipping and culling. TGSI_SEMANTIC_SAMPLEID """""""""""""""""""""" diff --git a/src/gallium/include/pipe/p_shader_tokens.h b/src/gallium/include/pipe/p_shader_tokens.h index 514b339da71..b9d28fe458c 100644 --- a/src/gallium/include/pipe/p_shader_tokens.h +++ b/src/gallium/include/pipe/p_shader_tokens.h @@ -185,7 +185,6 @@ enum tgsi_semantic { TGSI_SEMANTIC_PCOORD, /**< point sprite coordinate */ TGSI_SEMANTIC_VIEWPORT_INDEX, /**< viewport index */ TGSI_SEMANTIC_LAYER, /**< layer (rendertarget index) */ - TGSI_SEMANTIC_CULLDIST, TGSI_SEMANTIC_SAMPLEID, TGSI_SEMANTIC_SAMPLEPOS, TGSI_SEMANTIC_SAMPLEMASK, |