4 files changed, 11 insertions, 2 deletions
diff --git a/src/gallium/drivers/r300/r300_fs.c b/src/gallium/drivers/r300/r300_fs.c
index 75a05498eb3..ae4c62b2f1d 100644
--- a/src/gallium/drivers/r300/r300_fs.c
+++ b/src/gallium/drivers/r300/r300_fs.c
@@ -179,6 +179,7 @@ static void r300_translate_fragment_shader(
     /* Translate TGSI to our internal representation */
     ttr.compiler = &compiler.Base;
     ttr.info = &fs->info;
+    ttr.use_half_swizzles = TRUE;
 
     r300_tgsi_to_rc(&ttr, fs->state.tokens);
 
diff --git a/src/gallium/drivers/r300/r300_tgsi_to_rc.c b/src/gallium/drivers/r300/r300_tgsi_to_rc.c
index 1c82fccd9c0..aff4ddd4e23 100644
--- a/src/gallium/drivers/r300/r300_tgsi_to_rc.c
+++ b/src/gallium/drivers/r300/r300_tgsi_to_rc.c
@@ -307,7 +307,7 @@ static void handle_immediate(struct tgsi_to_rc * ttr,
     for (i = 0; i < 4; i++) {
         if (imm->u[i].Float == 0.0f) {
             swizzle |= RC_SWIZZLE_ZERO << (i * 3);
-        } else if (imm->u[i].Float == 0.5f) {
+        } else if (imm->u[i].Float == 0.5f && ttr->use_half_swizzles) {
             swizzle |= RC_SWIZZLE_HALF << (i * 3);
         } else if (imm->u[i].Float == 1.0f) {
             swizzle |= RC_SWIZZLE_ONE << (i * 3);
@@ -330,7 +330,8 @@ static void handle_immediate(struct tgsi_to_rc * ttr,
     }
 }
 
-void r300_tgsi_to_rc(struct tgsi_to_rc * ttr, const struct tgsi_token * tokens)
+void r300_tgsi_to_rc(struct tgsi_to_rc * ttr,
+                     const struct tgsi_token * tokens)
 {
     struct tgsi_parse_context parser;
     unsigned imm_index = 0;
diff --git a/src/gallium/drivers/r300/r300_tgsi_to_rc.h b/src/gallium/drivers/r300/r300_tgsi_to_rc.h
index 39b473c7bf5..97641a954b9 100644
--- a/src/gallium/drivers/r300/r300_tgsi_to_rc.h
+++ b/src/gallium/drivers/r300/r300_tgsi_to_rc.h
@@ -23,6 +23,8 @@
 #ifndef R300_TGSI_TO_RC_H
 #define R300_TGSI_TO_RC_H
 
+#include "pipe/p_compiler.h"
+
 struct radeon_compiler;
 
 struct tgsi_full_declaration;
@@ -41,6 +43,10 @@ struct tgsi_to_rc {
     int immediate_offset;
     struct swizzled_imms * imms_to_swizzle;
     unsigned imms_to_swizzle_count;
+
+    /* Vertex shaders have no half swizzles, and no way to handle them, so
+     * until rc grows proper support, indicate if they're safe to use. */
+    boolean use_half_swizzles;
 };
 
 void r300_tgsi_to_rc(struct tgsi_to_rc * ttr, const struct tgsi_token * tokens);
diff --git a/src/gallium/drivers/r300/r300_vs.c b/src/gallium/drivers/r300/r300_vs.c
index fb81b2439b6..a6786c321c6 100644
--- a/src/gallium/drivers/r300/r300_vs.c
+++ b/src/gallium/drivers/r300/r300_vs.c
@@ -340,6 +340,7 @@ void r300_translate_vertex_shader(struct r300_context* r300,
     /* Translate TGSI to our internal representation */
     ttr.compiler = &compiler.Base;
     ttr.info = &vs->info;
+    ttr.use_half_swizzles = FALSE;
 
     r300_tgsi_to_rc(&ttr, vs->state.tokens);