freedreno/ir3: rename frag_vcoord -> ij_pixel

Since this is what the value actually is.  Cleanup the name before
adding more different i,j related values for sample-shading.

Signed-off-by: Rob Clark <robdclark@chromium.org>

3 files changed, 16 insertions, 10 deletions

diff --git a/src/freedreno/ir3/ir3_compiler_nir.c b/src/freedreno/ir3/ir3_compiler_nir.c
index 41d297a4c33..8347520f6d5 100644
--- a/src/freedreno/ir3/ir3_compiler_nir.c
+++ b/src/freedreno/ir3/ir3_compiler_nir.c
@@ -95,7 +95,7 @@ create_frag_input(struct ir3_context *ctx, bool use_ldlv, unsigned n)
 		instr->cat6.type = TYPE_U32;
 		instr->cat6.iim_val = 1;
 	} else {
-		instr = ir3_BARY_F(block, inloc, 0, ctx->frag_vcoord, 0);
+		instr = ir3_BARY_F(block, inloc, 0, ctx->ij_pixel, 0);
 		instr->regs[2]->wrmask = 0x3;
 	}
 
@@ -1170,7 +1170,11 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
 		break;
 	case nir_intrinsic_load_barycentric_centroid:
 	case nir_intrinsic_load_barycentric_pixel:
-		ir3_split_dest(b, dst, ctx->frag_vcoord, 0, 2);
+		/* NOTE: we still pre-create ij_pixel just to keep things working with
+		 * nir producers that create "old style" frag shader inputs (ie. just
+		 * load_input, vs load_barycentric_* + load_interpolated_input)
+		 */
+		ir3_split_dest(b, dst, ctx->ij_pixel, 0, 2);
 		break;
 	case nir_intrinsic_load_interpolated_input:
 		idx = nir_intrinsic_base(intr);
@@ -2557,6 +2561,12 @@ emit_instructions(struct ir3_context *ctx)
 
 	/* for fragment shader, the vcoord input register is used as the
 	 * base for bary.f varying fetch instrs:
+	 *
+	 * TODO defer creating ctx->ij_pixel and corresponding sysvals
+	 * until emit_intrinsic when we know they are actually needed.
+	 * For now, we defer creating ctx->ij_centroid, etc, since we
+	 * only need ij_pixel for "old style" varying inputs (ie.
+	 * tgsi_to_nir)
 	 */
 	struct ir3_instruction *vcoord = NULL;
 	if (ctx->so->type == MESA_SHADER_FRAGMENT) {
@@ -2565,7 +2575,7 @@ emit_instructions(struct ir3_context *ctx)
 		vcoord = create_input_compmask(ctx, 0, 0x3);
 		ir3_split_dest(ctx->block, xy, vcoord, 0, 2);
 
-		ctx->frag_vcoord = ir3_create_collect(ctx, xy, 2);
+		ctx->ij_pixel = ir3_create_collect(ctx, xy, 2);
 	}
 
 	/* Setup inputs: */
diff --git a/src/freedreno/ir3/ir3_context.h b/src/freedreno/ir3/ir3_context.h
index 5589386edfa..8c1dc45e42b 100644
--- a/src/freedreno/ir3/ir3_context.h
+++ b/src/freedreno/ir3/ir3_context.h
@@ -58,18 +58,14 @@ struct ir3_context {
 	nir_function_impl *impl;
 
 	/* For fragment shaders, varyings are not actual shader inputs,
-	 * instead the hw passes a varying-coord which is used with
+	 * instead the hw passes a ij coord which is used with
 	 * bary.f.
 	 *
 	 * But NIR doesn't know that, it still declares varyings as
 	 * inputs.  So we do all the input tracking normally and fix
 	 * things up after compile_instructions()
-	 *
-	 * NOTE that frag_vcoord is the hardware position (possibly it
-	 * is actually an index or tag or some such.. it is *not*
-	 * values that can be directly used for gl_FragCoord..)
 	 */
-	struct ir3_instruction *frag_vcoord;
+	struct ir3_instruction *ij_pixel;
 
 	/* for fragment shaders, for gl_FrontFacing and gl_FragCoord: */
 	struct ir3_instruction *frag_face, *frag_coord;
diff --git a/src/freedreno/ir3/ir3_shader.c b/src/freedreno/ir3/ir3_shader.c
index 03c3e31f913..fa4f432e606 100644
--- a/src/freedreno/ir3/ir3_shader.c
+++ b/src/freedreno/ir3/ir3_shader.c
@@ -407,7 +407,7 @@ ir3_shader_disasm(struct ir3_shader_variant *so, uint32_t *bin, FILE *out)
 		dump_output(out, so, VARYING_SLOT_PSIZ, "psize");
 		break;
 	case MESA_SHADER_FRAGMENT:
-		dump_reg(out, "pos (bary)",
+		dump_reg(out, "pos (ij_pixel)",
 			ir3_find_sysval_regid(so, SYSTEM_VALUE_BARYCENTRIC_PIXEL));
 		dump_output(out, so, FRAG_RESULT_DEPTH, "posz");
 		if (so->color0_mrt) {