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gallium/tgsi: add support for stencil writes.

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this adds the capability + a stencil semantic id, + tgsi scan support.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2010-10-06 09:28:46 +10:00
parent 43873b53c4
commit 4ecb2c105d
7 changed files with 28 additions and 8 deletions
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3
src/gallium/auxiliary/tgsi/tgsi_dump.c
View File

@@ -126,7 +126,8 @@ static const char *semantic_names[] =
"FACE",
"EDGEFLAG",
"PRIM_ID",
"INSTANCEID"
"INSTANCEID",
"STENCIL"
};
static const char *immediate_type_names[] =

8
src/gallium/auxiliary/tgsi/tgsi_scan.c
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@@ -157,9 +157,11 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
/* extra info for special outputs */
if (procType == TGSI_PROCESSOR_FRAGMENT &&
fulldecl->Semantic.Name == TGSI_SEMANTIC_POSITION) {
info->writes_z = TRUE;
}
fulldecl->Semantic.Name == TGSI_SEMANTIC_POSITION)
info->writes_z = TRUE;
if (procType == TGSI_PROCESSOR_FRAGMENT &&
fulldecl->Semantic.Name == TGSI_SEMANTIC_STENCIL)
info->writes_stencil = TRUE;
if (procType == TGSI_PROCESSOR_VERTEX &&
fulldecl->Semantic.Name == TGSI_SEMANTIC_EDGEFLAG) {
info->writes_edgeflag = TRUE;

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

@@ -60,6 +60,7 @@ struct tgsi_shader_info
uint opcode_count[TGSI_OPCODE_LAST]; /**< opcode histogram */
boolean writes_z; /**< does fragment shader write Z value? */
boolean writes_stencil; /**< does fragment shader write stencil value? */
boolean writes_edgeflag; /**< vertex shader outputs edgeflag */
boolean uses_kill; /**< KIL or KILP instruction used? */

6
src/gallium/docs/source/tgsi.rst
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@@ -1415,6 +1415,12 @@ Edge flags are used to control which lines or points are actually
drawn when the polygon mode converts triangles/quads/polygons into
points or lines.
TGSI_SEMANTIC_STENCIL
""""""""""""""""""""""
For fragment shaders, this semantic label indicates than an output
is a writable stencil reference value. Only the Y component is writable.
This allows the fragment shader to change the fragments stencilref value.
Properties

12
src/gallium/drivers/softpipe/sp_fs_exec.c
View File

@@ -158,9 +158,17 @@ exec_run( const struct sp_fragment_shader *base,
case TGSI_SEMANTIC_POSITION:
{
uint j;
for (j = 0; j < 4; j++) {
for (j = 0; j < 4; j++)
quad->output.depth[j] = machine->Outputs[i].xyzw[2].f[j];
}
}
break;
case TGSI_SEMANTIC_STENCIL:
{
uint j;
for (j = 0; j < 4; j++)
quad->output.stencil[j] = (unsigned)machine->Outputs[i].xyzw[1].f[j];
}
break;
}

3
src/gallium/include/pipe/p_defines.h
View File

@@ -464,7 +464,8 @@ enum pipe_cap {
PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT,
PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER,
PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER,
PIPE_CAP_DEPTH_CLAMP
PIPE_CAP_DEPTH_CLAMP,
PIPE_CAP_SHADER_STENCIL_EXPORT,
};
/* Shader caps not specific to any single stage */

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

@@ -143,7 +143,8 @@ struct tgsi_declaration_dimension
#define TGSI_SEMANTIC_EDGEFLAG 8
#define TGSI_SEMANTIC_PRIMID 9
#define TGSI_SEMANTIC_INSTANCEID 10
#define TGSI_SEMANTIC_COUNT 11 /**< number of semantic values */
#define TGSI_SEMANTIC_STENCIL 11
#define TGSI_SEMANTIC_COUNT 12 /**< number of semantic values */
struct tgsi_declaration_semantic
{