From: Marek Olšák <marek.olsak@amd.com>
Date: Sun, 9 Mar 2014 23:19:21 +0000 (+0100)
Subject: r600g: document why texture offset emulation is needed
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9c2a3934c5e039d996c721478eeb1fa3f956904e;p=mesa.git

r600g: document why texture offset emulation is needed
---

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 0016d29a2a8..ddf79eee930 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -4800,8 +4800,9 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
 	if (inst->Texture.NumOffsets) {
 		assert(inst->Texture.NumOffsets == 1);
 
+		/* The texture offset feature doesn't work with the TXF instruction
+		 * and must be emulated by adding the offset to the texture coordinates. */
 		if (txf_add_offsets) {
-			/* Add the offsets for texelFetch manually. */
 			const struct tgsi_texture_offset *off = inst->TexOffsets;
 
 			switch (inst->Texture.Texture) {