[Mesa-dev] [PATCH 1/4] ac/shader: scan output usage mask for VS and TES

[Samuel Pitoiset]

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/amd/common/ac_shader_info.c | 18 ++++++++++++++++++
 src/amd/common/ac_shader_info.h |  4 ++++
 2 files changed, 22 insertions(+)

diff --git a/src/amd/common/ac_shader_info.c b/src/amd/common/ac_shader_info.c
index 57d7edec76..98de963147 100644
--- a/src/amd/common/ac_shader_info.c
+++ b/src/amd/common/ac_shader_info.c
@@ -146,6 +146,24 @@ gather_intrinsic_info(const nir_shader *nir, const nir_intrinsic_instr *instr,
 			}
 		}
 		break;
+	case nir_intrinsic_store_var: {
+		nir_deref_var *dvar = instr->variables[0];
+		nir_variable *var = dvar->var;
+
+		if (var->data.mode == nir_var_shader_out) {
+			unsigned idx = var->data.location;
+			unsigned comp = var->data.location_frac;
+
+			if (nir->info.stage == MESA_SHADER_VERTEX) {
+				info->vs.output_usage_mask[idx] |=
+					instr->const_index[0] << comp;
+			} else if (nir->info.stage == MESA_SHADER_TESS_EVAL) {
+				info->tes.output_usage_mask[idx] |=
+					instr->const_index[0] << comp;
+			}
+		}
+		break;
+	}
 	default:
 		break;
 	}
diff --git a/src/amd/common/ac_shader_info.h b/src/amd/common/ac_shader_info.h
index 60ddfd2d71..12a1dcf915 100644
--- a/src/amd/common/ac_shader_info.h
+++ b/src/amd/common/ac_shader_info.h
@@ -37,10 +37,14 @@ struct ac_shader_info {
 	bool uses_prim_id;
 	struct {
 		uint8_t input_usage_mask[VERT_ATTRIB_MAX];
+		uint8_t output_usage_mask[VARYING_SLOT_VAR31 + 1];
 		bool has_vertex_buffers; /* needs vertex buffers and base/start */
 		bool needs_draw_id;
 		bool needs_instance_id;
 	} vs;
+	struct {
+		uint8_t output_usage_mask[VARYING_SLOT_VAR31 + 1];
+	} tes;
 	struct {
 		bool force_persample;
 		bool needs_sample_positions;
-- 
2.16.2