r600g: do all CUBE ALU operations before gradient texture operations (v2.1)

This moves all the CUBE section above the gradients section,
so that the gradient emission happens on one block which
is what sb/hardware expect.

v2: avoid changes to bytecode by using spare temps
v2.1: shame gcc, oh the shame. (uninit var warnings)

Cc: "10.4 10.3" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Glenn Kennard <glenn.kennard@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 72 insertions, 64 deletions

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 41caac3..a772dee 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -5095,6 +5095,14 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 	    inst->Instruction.Opcode == TGSI_OPCODE_TG4)
 		sampler_src_reg = 2;
 
+	/* TGSI moves the sampler to src reg 3 for TXD */
+	if (inst->Instruction.Opcode == TGSI_OPCODE_TXD)
+		sampler_src_reg = 3;
+
+	sampler_index_mode = inst->Src[sampler_src_reg].Indirect.Index == 2 ? 2 : 0; // CF_INDEX_1 : CF_INDEX_NONE
+	if (sampler_index_mode)
+		ctx->shader->uses_index_registers = true;
+
 	src_gpr = tgsi_tex_get_src_gpr(ctx, 0);
 
 	if (inst->Texture.Texture == TGSI_TEXTURE_BUFFER) {
@@ -5109,67 +5117,7 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 		}
 	}
 
-	if (inst->Instruction.Opcode == TGSI_OPCODE_TXD) {
-		int temp_h, temp_v;
-		/* TGSI moves the sampler to src reg 3 for TXD */
-		sampler_src_reg = 3;
-
-		sampler_index_mode = inst->Src[sampler_src_reg].Indirect.Index == 2 ? 2 : 0; // CF_INDEX_1 : CF_INDEX_NONE
-
-		src_loaded = TRUE;
-		for (i = 0; i < 3; i++) {
-			int treg = r600_get_temp(ctx);
-
-			if (i == 0)
-				src_gpr = treg;
-			else if (i == 1)
-				temp_h = treg;
-			else
-				temp_v = treg;
-
-			for (j = 0; j < 4; j++) {
-				memset(&alu, 0, sizeof(struct r600_bytecode_alu));
-				alu.op = ALU_OP1_MOV;
-                                r600_bytecode_src(&alu.src[0], &ctx->src[i], j);
-                                alu.dst.sel = treg;
-                                alu.dst.chan = j;
-                                if (j == 3)
-                                   alu.last = 1;
-                                alu.dst.write = 1;
-                                r = r600_bytecode_add_alu(ctx->bc, &alu);
-                                if (r)
-                                    return r;
-			}
-		}
-		for (i = 1; i < 3; i++) {
-			/* set gradients h/v */
-			memset(&tex, 0, sizeof(struct r600_bytecode_tex));
-			tex.op = (i == 1) ? FETCH_OP_SET_GRADIENTS_H :
-				FETCH_OP_SET_GRADIENTS_V;
-			tex.sampler_id = tgsi_tex_get_src_gpr(ctx, sampler_src_reg);
-			tex.sampler_index_mode = sampler_index_mode;
-			tex.resource_id = tex.sampler_id + R600_MAX_CONST_BUFFERS;
-			tex.resource_index_mode = sampler_index_mode;
-
-			tex.src_gpr = (i == 1) ? temp_h : temp_v;
-			tex.src_sel_x = 0;
-			tex.src_sel_y = 1;
-			tex.src_sel_z = 2;
-			tex.src_sel_w = 3;
-
-			tex.dst_gpr = ctx->temp_reg; /* just to avoid confusing the asm scheduler */
-			tex.dst_sel_x = tex.dst_sel_y = tex.dst_sel_z = tex.dst_sel_w = 7;
-			if (inst->Texture.Texture != TGSI_TEXTURE_RECT) {
-				tex.coord_type_x = 1;
-				tex.coord_type_y = 1;
-				tex.coord_type_z = 1;
-				tex.coord_type_w = 1;
-			}
-			r = r600_bytecode_add_tex(ctx->bc, &tex);
-			if (r)
-				return r;
-		}
-	} else if (inst->Instruction.Opcode == TGSI_OPCODE_TXP) {
+	if (inst->Instruction.Opcode == TGSI_OPCODE_TXP) {
 		int out_chan;
 		/* Add perspective divide */
 		if (ctx->bc->chip_class == CAYMAN) {
@@ -5233,9 +5181,6 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 		src_gpr = ctx->temp_reg;
 	}
 
-	sampler_index_mode = inst->Src[sampler_src_reg].Indirect.Index == 2 ? 2 : 0; // CF_INDEX_1 : CF_INDEX_NONE
-	if (sampler_index_mode)
-		ctx->shader->uses_index_registers = true;
 
 	if ((inst->Texture.Texture == TGSI_TEXTURE_CUBE ||
 	     inst->Texture.Texture == TGSI_TEXTURE_CUBE_ARRAY ||
@@ -5454,6 +5399,69 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 		src_gpr = ctx->temp_reg;
 	}
 
+	if (inst->Instruction.Opcode == TGSI_OPCODE_TXD) {
+		int temp_h = 0, temp_v = 0;
+		int start_val = 0;
+
+		/* if we've already loaded the src (i.e. CUBE don't reload it). */
+		if (src_loaded == TRUE)
+			start_val = 1;
+		else
+			src_loaded = TRUE;
+		for (i = start_val; i < 3; i++) {
+			int treg = r600_get_temp(ctx);
+
+			if (i == 0)
+				src_gpr = treg;
+			else if (i == 1)
+				temp_h = treg;
+			else
+				temp_v = treg;
+
+			for (j = 0; j < 4; j++) {
+				memset(&alu, 0, sizeof(struct r600_bytecode_alu));
+				alu.op = ALU_OP1_MOV;
+                                r600_bytecode_src(&alu.src[0], &ctx->src[i], j);
+                                alu.dst.sel = treg;
+                                alu.dst.chan = j;
+                                if (j == 3)
+                                   alu.last = 1;
+                                alu.dst.write = 1;
+                                r = r600_bytecode_add_alu(ctx->bc, &alu);
+                                if (r)
+                                    return r;
+			}
+		}
+		for (i = 1; i < 3; i++) {
+			/* set gradients h/v */
+			memset(&tex, 0, sizeof(struct r600_bytecode_tex));
+			tex.op = (i == 1) ? FETCH_OP_SET_GRADIENTS_H :
+				FETCH_OP_SET_GRADIENTS_V;
+			tex.sampler_id = tgsi_tex_get_src_gpr(ctx, sampler_src_reg);
+			tex.sampler_index_mode = sampler_index_mode;
+			tex.resource_id = tex.sampler_id + R600_MAX_CONST_BUFFERS;
+			tex.resource_index_mode = sampler_index_mode;
+
+			tex.src_gpr = (i == 1) ? temp_h : temp_v;
+			tex.src_sel_x = 0;
+			tex.src_sel_y = 1;
+			tex.src_sel_z = 2;
+			tex.src_sel_w = 3;
+
+			tex.dst_gpr = r600_get_temp(ctx); /* just to avoid confusing the asm scheduler */
+			tex.dst_sel_x = tex.dst_sel_y = tex.dst_sel_z = tex.dst_sel_w = 7;
+			if (inst->Texture.Texture != TGSI_TEXTURE_RECT) {
+				tex.coord_type_x = 1;
+				tex.coord_type_y = 1;
+				tex.coord_type_z = 1;
+				tex.coord_type_w = 1;
+			}
+			r = r600_bytecode_add_tex(ctx->bc, &tex);
+			if (r)
+				return r;
+		}
+	}
+
 	if (src_requires_loading && !src_loaded) {
 		for (i = 0; i < 4; i++) {
 			memset(&alu, 0, sizeof(struct r600_bytecode_alu));