From: Rob Clark <robcl...@freedesktop.org>
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.
---
src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
b/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
index 6e77244..2320464 100644
--- a/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
+++ b/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
@@ -713,6 +713,10 @@ 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)
{
@@ -1377,7 +1381,7 @@ emit_intrinisic(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);
}
@@ -1385,7 +1389,7 @@ emit_intrinisic(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);
}
@@ -1397,6 +1401,14 @@ emit_intrinisic(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;
--
2.5.0
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