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i965/vec4/gs: Stop munging the ATTR containing gl_PointSize.

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gl_PointSize is delivered in the .w component of the VUE header, while
the language expects it to be a float (and thus in the .x component).

Previously, we emitted MOVs to copy it over to the .x component.
But this is silly - we can just use a .wwww swizzle and access it
without copying anything or clobbering the value stored at .x
(which admittedly is useless).

Removes the last use of ATTR destinations.

v2: Use BRW_SWIZZLE_WWWW, not SWIZZLE_WWWW (caught by GCC).

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
This commit is contained in:
Kenneth Graunke
2016-01-13 20:33:16 -08:00
parent d56ae2d160
commit 67c5d00273
2 changed files with 4 additions and 23 deletions
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4
src/mesa/drivers/dri/i965/brw_vec4_gs_nir.cpp
View File

@@ -73,6 +73,10 @@ vec4_gs_visitor::nir_emit_intrinsic(nir_intrinsic_instr *instr)
src = src_reg(ATTR, BRW_VARYING_SLOT_COUNT * vertex->u[0] +
instr->const_index[0] + offset->u[0],
type);
/* gl_PointSize is passed in the .w component of the VUE header */
if (instr->const_index[0] == VARYING_SLOT_PSIZ)
src.swizzle = BRW_SWIZZLE_WWWW;
dest = get_nir_dest(instr->dest, src.type);
dest.writemask = brw_writemask_for_size(instr->num_components);
emit(MOV(dest, src));

23
src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
View File

@@ -182,29 +182,6 @@ vec4_gs_visitor::emit_prolog()
}
}
/* If the geometry shader uses the gl_PointSize input, we need to fix it up
* to account for the fact that the vertex shader stored it in the w
* component of VARYING_SLOT_PSIZ.
*/
if (nir->info.inputs_read & VARYING_BIT_PSIZ) {
this->current_annotation = "swizzle gl_PointSize input";
for (int vertex = 0; vertex < (int)nir->info.gs.vertices_in; vertex++) {
dst_reg dst(ATTR,
BRW_VARYING_SLOT_COUNT * vertex + VARYING_SLOT_PSIZ);
dst.type = BRW_REGISTER_TYPE_F;
src_reg src(dst);
dst.writemask = WRITEMASK_X;
src.swizzle = BRW_SWIZZLE_WWWW;
inst = emit(MOV(dst, src));
/* In dual instanced dispatch mode, dst has a width of 4, so we need
* to make sure the MOV happens regardless of which channels are
* enabled.
*/
inst->force_writemask_all = true;
}
}
this->current_annotation = NULL;
}