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i965: Write gl_FragCoord directly to the destination.

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This patch makes emit_general_interpolation take a destination register
as an argument, and write directly to that.  This is simpler than the
old approach of ralloc'ing a register, writing to that temporary, and
then making the caller emit per-component MOVs to copy it to the actual
destination.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
This commit is contained in:
Kenneth Graunke 2016-07-14 16:52:10 -07:00
parent a03812c321
commit 7ef7738a61
3 changed files with 4 additions and 10 deletions
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8
src/mesa/drivers/dri/i965/brw_fs.cpp
View file

@ -1039,12 +1039,10 @@ fs_visitor::import_uniforms(fs_visitor *v)
this->uniforms = v->uniforms;
}
fs_reg *
fs_visitor::emit_fragcoord_interpolation()
void
fs_visitor::emit_fragcoord_interpolation(fs_reg wpos)
{
assert(stage == MESA_SHADER_FRAGMENT);
fs_reg *reg = new(this->mem_ctx) fs_reg(vgrf(glsl_type::vec4_type));
fs_reg wpos = *reg;
/* gl_FragCoord.x */
bld.MOV(wpos, this->pixel_x);
@ -1066,8 +1064,6 @@ fs_visitor::emit_fragcoord_interpolation()
/* gl_FragCoord.w: Already set up in emit_interpolation */
bld.MOV(wpos, this->wpos_w);
return reg;
}
static enum brw_barycentric_mode

2
src/mesa/drivers/dri/i965/brw_fs.h
View file

@ -169,7 +169,7 @@ public:
void emit_dummy_fs();
void emit_repclear_shader();
fs_reg *emit_fragcoord_interpolation();
void emit_fragcoord_interpolation(fs_reg wpos);
fs_reg *emit_frontfacing_interpolation();
fs_reg *emit_samplepos_setup();
fs_reg *emit_sampleid_setup();

4
src/mesa/drivers/dri/i965/brw_fs_nir.cpp
View file

@ -62,9 +62,7 @@ fs_visitor::nir_setup_inputs()
fs_reg reg;
if (var->data.location == VARYING_SLOT_POS) {
reg = *emit_fragcoord_interpolation();
emit_percomp(bld, fs_inst(BRW_OPCODE_MOV, bld.dispatch_width(),
input, reg), 0xF);
emit_fragcoord_interpolation(input);
} else if (var->data.location == VARYING_SLOT_LAYER) {
struct brw_reg reg = suboffset(interp_reg(VARYING_SLOT_LAYER, 1), 3);
reg.type = BRW_REGISTER_TYPE_D;