From: Vadim Girlin <vadimgirlin@gmail.com>
Date: Thu, 25 Apr 2013 15:42:31 +0000 (+0400)
Subject: r600g: mask unused source components for SAMPLE
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7d555f2f4ce8be3c53bcc914620bcefc22c05cb5;p=mesa.git

r600g: mask unused source components for SAMPLE

This results in more clean shader code and may improve the quality of
optimized code produced by r600-sb due to eliminated false dependencies
in some cases.

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
---

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index bb54e38a63c..f0d3be405d2 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -4743,6 +4743,26 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 		/* the array index is read from Z */
 		tex.coord_type_z = 0;
 
+	/* mask unused source components */
+	if (opcode == FETCH_OP_SAMPLE) {
+		switch (inst->Texture.Texture) {
+		case TGSI_TEXTURE_2D:
+		case TGSI_TEXTURE_RECT:
+			tex.src_sel_z = 7;
+			tex.src_sel_w = 7;
+			break;
+		case TGSI_TEXTURE_1D_ARRAY:
+			tex.src_sel_y = 7;
+			tex.src_sel_w = 7;
+			break;
+		case TGSI_TEXTURE_1D:
+			tex.src_sel_y = 7;
+			tex.src_sel_z = 7;
+			tex.src_sel_w = 7;
+			break;
+		}
+	}
+
 	r = r600_bytecode_add_tex(ctx->bc, &tex);
 	if (r)
 		return r;