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v3d: Implement ALPHA_TO_COVERAGE.

Browse source 
There's a convenient "FTOC" instruction for generating the coverage now,
unlike vc4.  This fixes
dEQP-GLES3.functional.multisample.fbo_4_samples.proportionality_alpha_to_coverage
This commit is contained in:
Eric Anholt 2018-06-19 16:27:17 -07:00
parent 94f7c011d6
commit f49d112a01
2 changed files with 15 additions and 2 deletions
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14
src/broadcom/compiler/nir_to_vir.c
View file

@ -920,6 +920,16 @@ emit_frag_end(struct v3d_compile *c)
has_any_tlb_color_write = true;
}
if (c->fs_key->sample_alpha_to_coverage && c->output_color_var[0]) {
struct nir_variable *var = c->output_color_var[0];
struct qreg *color = &c->outputs[var->data.driver_location * 4];
vir_SETMSF_dest(c, vir_reg(QFILE_NULL, 0),
vir_AND(c,
vir_MSF(c),
vir_FTOC(c, color[3])));
}
if (c->output_position_index != -1) {
struct qinst *inst = vir_MOV_dest(c,
vir_reg(QFILE_TLBU, 0),
@ -930,7 +940,9 @@ emit_frag_end(struct v3d_compile *c)
TLB_TYPE_DEPTH |
TLB_DEPTH_TYPE_PER_PIXEL |
0xffffff00);
} else if (c->s->info.fs.uses_discard || !has_any_tlb_color_write) {
} else if (c->s->info.fs.uses_discard ||
c->fs_key->sample_alpha_to_coverage ||
!has_any_tlb_color_write) {
/* Emit passthrough Z if it needed to be delayed until shader
* end due to potential discards.
*

3
src/broadcom/compiler/vir.c
View file

@ -840,7 +840,8 @@ uint64_t *v3d_compile_fs(const struct v3d_compiler *compiler,
v3d_set_fs_prog_data_inputs(c, prog_data);
prog_data->writes_z = (c->s->info.outputs_written &
(1 << FRAG_RESULT_DEPTH));
prog_data->discard = c->s->info.fs.uses_discard;
prog_data->discard = (c->s->info.fs.uses_discard ||
c->fs_key->sample_alpha_to_coverage);
prog_data->uses_center_w = c->uses_center_w;
return v3d_return_qpu_insts(c, final_assembly_size);