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gallium: rework handling of sprite_coord_enable state

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Implement the pipe_rasterizer_state::sprite_coord_enable field
in the draw module (and softpipe) according to what's specified
in the documentation.

The draw module can now add any number of extra vertex attributes
to a post-transformed vertex and generate texcoords for those
attributes per sprite_coord_enable.  Auto-generated texcoords
for sprites only worked for one texcoord unit before.

The frag shader gl_PointCoord input is now implemented like any
other generic/texcoord attribute.

The draw module now needs to be informed about fragment shaders
since we need to look at the fragment shader's inputs to know
which ones need auto-generated texcoords.

Only softpipe has been updated so far.
This commit is contained in:
Brian Paul
2010-09-17 18:41:30 -06:00
parent 49cb978aa4
commit e22e3927b0
12 changed files with 172 additions and 94 deletions
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17
src/mesa/state_tracker/st_program.c
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@@ -338,17 +338,6 @@ st_translate_fragment_program(struct st_context *st,
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_CONSTANT;
break;
case FRAG_ATTRIB_PNTC:
/* This is a hack. We really need a new semantic label for
* point coord. The draw module needs to know which fragment
* shader input is the point coord attribute so that it can set
* up the right vertex attribute values.
*/
input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
input_semantic_index[slot] = 0;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
/* In most cases, there is nothing special about these
* inputs, so adopt a convention to use the generic
* semantic name and the mesa FRAG_ATTRIB_ number as the
@@ -364,6 +353,7 @@ st_translate_fragment_program(struct st_context *st,
* zero or be restricted to a particular range -- nobody
* should be building tables based on semantic index.
*/
case FRAG_ATTRIB_PNTC:
case FRAG_ATTRIB_TEX0:
case FRAG_ATTRIB_TEX1:
case FRAG_ATTRIB_TEX2:
@@ -380,7 +370,10 @@ st_translate_fragment_program(struct st_context *st,
assert(attr >= FRAG_ATTRIB_TEX0);
input_semantic_index[slot] = (attr - FRAG_ATTRIB_TEX0);
input_semantic_name[slot] = TGSI_SEMANTIC_GENERIC;
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
if (attr == FRAG_ATTRIB_PNTC)
interpMode[slot] = TGSI_INTERPOLATE_LINEAR;
else
interpMode[slot] = TGSI_INTERPOLATE_PERSPECTIVE;
break;
}
}