Mesa (master): r600g: fix TXD src regs needing fetching.

[Dave Airlie]

Module: Mesa
Branch: master
Commit: 40aec11b7569fcdd2d884629b172af3db3fbaf1d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=40aec11b7569fcdd2d884629b172af3db3fbaf1d

Author: Mike Kaplinskiy <mike.kaplinskiy at gmail.com>
Date:   Wed Jun 15 16:56:10 2011 +1000

r600g: fix TXD src regs needing fetching.

[airlied: final chunk of Mike's patch from bug 37476
this uses a loop to emit the GRADIENTS and does a check to
see if we need to fetch to a temporary register. It also
increases the context src gpr to 4 which is needed here.]

Signed-off-by: Dave Airlie <airlied at redhat.com>

---

 src/gallium/drivers/r600/r600_shader.c |   94 +++++++++++++++++---------------
 1 files changed, 49 insertions(+), 45 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 0eb776c..b8a86b0 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -186,7 +186,7 @@ struct r600_shader_ctx {
 	struct r600_shader_tgsi_instruction	*inst_info;
 	struct r600_bc				*bc;
 	struct r600_shader			*shader;
-	struct r600_shader_src			src[3];
+	struct r600_shader_src			src[4];
 	u32					*literals;
 	u32					nliterals;
 	u32					max_driver_temp_used;
@@ -1768,7 +1768,7 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 	struct r600_bc_tex tex;
 	struct r600_bc_alu alu;
 	unsigned src_gpr;
-	int r, i;
+	int r, i, j;
 	int opcode;
 	/* Texture fetch instructions can only use gprs as source.
 	 * Also they cannot negate the source or take the absolute value */
@@ -1782,51 +1782,55 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 		/* TGSI moves the sampler to src reg 3 for TXD */
 		sampler_src_reg = 3;
 
-		/* set gradients h/v */
-		memset(&tex, 0, sizeof(struct r600_bc_tex));
-		tex.inst = SQ_TEX_INST_SET_GRADIENTS_H;
-		tex.sampler_id = tgsi_tex_get_src_gpr(ctx, sampler_src_reg);
-		tex.resource_id = tex.sampler_id + R600_MAX_CONST_BUFFERS;
-		tex.src_gpr = tgsi_tex_get_src_gpr(ctx, 1);
-		tex.src_sel_x = ctx->src[1].swizzle[0];
-		tex.src_sel_y = ctx->src[1].swizzle[1];
-		tex.src_sel_z = ctx->src[1].swizzle[2];
-		tex.src_sel_w = ctx->src[1].swizzle[3];
-		tex.src_rel = ctx->src[1].rel;
-		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_bc_add_tex(ctx->bc, &tex);
-		if (r)
-			return r;
+		for (i = 1; i < 3; i++) {
+			/* set gradients h/v */
+			memset(&tex, 0, sizeof(struct r600_bc_tex));
+			tex.inst = (i == 1) ? SQ_TEX_INST_SET_GRADIENTS_H :
+				SQ_TEX_INST_SET_GRADIENTS_V;
+			tex.sampler_id = tgsi_tex_get_src_gpr(ctx, sampler_src_reg);
+			tex.resource_id = tex.sampler_id + R600_MAX_CONST_BUFFERS;
+
+			if (tgsi_tex_src_requires_loading(ctx, i)) {
+				tex.src_gpr = r600_get_temp(ctx);
+				tex.src_sel_x = 0;
+				tex.src_sel_y = 1;
+				tex.src_sel_z = 2;
+				tex.src_sel_w = 3;
+
+				for (j = 0; j < 4; j++) {
+					memset(&alu, 0, sizeof(struct r600_bc_alu));
+					alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_MOV);
+                                        r600_bc_src(&alu.src[0], &ctx->src[i], j);
+                                        alu.dst.sel = tex.src_gpr;
+                                        alu.dst.chan = j;
+                                        if (j == 3)
+                                                alu.last = 1;
+                                        alu.dst.write = 1;
+                                        r = r600_bc_add_alu(ctx->bc, &alu);
+                                        if (r)
+                                                return r;
+				}
 
-		/* set gradients h/v */
-		memset(&tex, 0, sizeof(struct r600_bc_tex));
-		tex.inst = SQ_TEX_INST_SET_GRADIENTS_V;
-		tex.sampler_id = tgsi_tex_get_src_gpr(ctx, sampler_src_reg);
-		tex.resource_id = tex.sampler_id + R600_MAX_CONST_BUFFERS;
-		tex.src_gpr = tgsi_tex_get_src_gpr(ctx, 2);
-		tex.src_sel_x = ctx->src[2].swizzle[0];
-		tex.src_sel_y = ctx->src[2].swizzle[1];
-		tex.src_sel_z = ctx->src[2].swizzle[2];
-		tex.src_sel_w = ctx->src[2].swizzle[3];
-		tex.src_rel = ctx->src[2].rel;
-		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_bc_add_tex(ctx->bc, &tex);
-		if (r)
-			return r;
+			} else {
+				tex.src_gpr = tgsi_tex_get_src_gpr(ctx, i);
+				tex.src_sel_x = ctx->src[i].swizzle[0];
+				tex.src_sel_y = ctx->src[i].swizzle[1];
+				tex.src_sel_z = ctx->src[i].swizzle[2];
+				tex.src_sel_w = ctx->src[i].swizzle[3];
+				tex.src_rel = ctx->src[i].rel;
+			}
+			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_bc_add_tex(ctx->bc, &tex);
+			if (r)
+				return r;
+		}
 	} else if (inst->Instruction.Opcode == TGSI_OPCODE_TXP) {
 		int out_chan;
 		/* Add perspective divide */