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freedreno/ir3: support load_front_face intrinsic 

With tgsi_to_nir we get this as a normal input with VARYING_SLOT_FACE.
But glsl_to_nir plus nir_lower_system_values this becomes an intrinsic.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Rob Clark 2015-11-05 13:31:25 -05:00
parent 9e05e8cb75
commit f212d7dc50
1 changed files with 14 additions and 2 deletions
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16
src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
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@ -556,6 +556,10 @@ create_frag_coord(struct ir3_compile *ctx, unsigned comp)
}
}
/* NOTE: this creates the "TGSI" style fragface (ie. input slot
* VARYING_SLOT_FACE). For NIR style nir_intrinsic_load_front_face
* we can just use the value from hw directly (since it is boolean)
*/
static struct ir3_instruction *
create_frag_face(struct ir3_compile *ctx, unsigned comp)
{
@ -1224,7 +1228,7 @@ emit_intrinsic(struct ir3_compile *ctx, nir_intrinsic_instr *intr)
break;
case nir_intrinsic_load_vertex_id_zero_base:
if (!ctx->vertex_id) {
ctx->vertex_id = create_input(ctx->block, 0);
ctx->vertex_id = create_input(b, 0);
add_sysval_input(ctx, SYSTEM_VALUE_VERTEX_ID_ZERO_BASE,
ctx->vertex_id);
}
@ -1232,7 +1236,7 @@ emit_intrinsic(struct ir3_compile *ctx, nir_intrinsic_instr *intr)
break;
case nir_intrinsic_load_instance_id:
if (!ctx->instance_id) {
ctx->instance_id = create_input(ctx->block, 0);
ctx->instance_id = create_input(b, 0);
add_sysval_input(ctx, SYSTEM_VALUE_INSTANCE_ID,
ctx->instance_id);
}
@ -1244,6 +1248,14 @@ emit_intrinsic(struct ir3_compile *ctx, nir_intrinsic_instr *intr)
dst[i] = create_driver_param(ctx, IR3_DP_UCP0_X + n);
}
break;
case nir_intrinsic_load_front_face:
if (!ctx->frag_face) {
ctx->so->frag_face = true;
ctx->frag_face = create_input(b, 0);
ctx->frag_face->regs[0]->flags |= IR3_REG_HALF;
}
dst[0] = ir3_ADD_S(b, ctx->frag_face, 0, create_immed(b, 1), 0);
break;
case nir_intrinsic_discard_if:
case nir_intrinsic_discard: {
struct ir3_instruction *cond, *kill;