From: Connor Abbott <cwabbott0@gmail.com>
Date: Wed, 1 Jul 2020 14:46:22 +0000 (+0200)
Subject: ir3: Add support for gl_ViewIndex in VS & FS
X-Git-Url: https://git.libre-soc.org/?p=mesa.git;a=commitdiff_plain;h=5ef960e93cd0321c92c324274c77e7ebf4b1bb86

ir3: Add support for gl_ViewIndex in VS & FS

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5720>
---

diff --git a/src/freedreno/ir3/ir3_compiler_nir.c b/src/freedreno/ir3/ir3_compiler_nir.c
index c3461c85c7d..8d9d8ef18d1 100644
--- a/src/freedreno/ir3/ir3_compiler_nir.c
+++ b/src/freedreno/ir3/ir3_compiler_nir.c
@@ -1861,6 +1861,12 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
 		}
 		dst[0] = ctx->base_instance;
 		break;
+	case nir_intrinsic_load_view_index:
+		if (!ctx->view_index) {
+			ctx->view_index = create_sysval_input(ctx, SYSTEM_VALUE_VIEW_INDEX, 0x1);
+		}
+		dst[0] = ctx->view_index;
+		break;
 	case nir_intrinsic_load_vertex_id_zero_base:
 	case nir_intrinsic_load_vertex_id:
 		if (!ctx->vertex_id) {
diff --git a/src/freedreno/ir3/ir3_context.h b/src/freedreno/ir3/ir3_context.h
index 30caf9d7b85..8cf2922f02c 100644
--- a/src/freedreno/ir3/ir3_context.h
+++ b/src/freedreno/ir3/ir3_context.h
@@ -83,7 +83,7 @@ struct ir3_context {
 	struct ir3_instruction *frag_face, *frag_coord;
 
 	/* For vertex shaders, keep track of the system values sources */
-	struct ir3_instruction *vertex_id, *basevertex, *instance_id, *base_instance, *draw_id;
+	struct ir3_instruction *vertex_id, *basevertex, *instance_id, *base_instance, *draw_id, *view_index;
 
 	/* For fragment shaders: */
 	struct ir3_instruction *samp_id, *samp_mask_in;
diff --git a/src/freedreno/ir3/ir3_shader.h b/src/freedreno/ir3/ir3_shader.h
index 99084e22f8c..53be9a6833d 100644
--- a/src/freedreno/ir3/ir3_shader.h
+++ b/src/freedreno/ir3/ir3_shader.h
@@ -851,6 +851,9 @@ struct ir3_shader_linkage {
 
 	/* location for fixed-function gl_PrimitiveID passthrough */
 	uint8_t primid_loc;
+
+	/* location for fixed-function gl_ViewIndex passthrough */
+	uint8_t viewid_loc;
 };
 
 static inline void
@@ -891,6 +894,7 @@ ir3_link_shaders(struct ir3_shader_linkage *l,
 	int j = -1, k;
 
 	l->primid_loc = 0xff;
+	l->viewid_loc = 0xff;
 
 	while (l->cnt < ARRAY_SIZE(l->var)) {
 		j = ir3_next_varying(fs, j);
@@ -907,6 +911,11 @@ ir3_link_shaders(struct ir3_shader_linkage *l,
 			l->primid_loc = fs->inputs[j].inloc;
 		}
 
+		if (fs->inputs[j].slot == VARYING_SLOT_VIEW_INDEX) {
+			assert(k < 0);
+			l->viewid_loc = fs->inputs[j].inloc;
+		}
+
 		ir3_link_add(l, k >= 0 ? vs->outputs[k].regid : default_regid,
 			fs->inputs[j].compmask, fs->inputs[j].inloc);
 	}