i965/vs: Clamp vertex color outputs when required by ARB_color_buffer_float.

Fixes glsl-vs-vertex-color.

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index 93252f7..2a1f003 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -1764,7 +1764,16 @@ vec4_visitor::emit_urb_writes()
       if (attr == VERT_RESULT_PSIZ)
         continue;
 
-      emit(BRW_OPCODE_MOV, brw_message_reg(mrf++), src_reg(output_reg[attr]));
+      vec4_instruction *inst = emit(BRW_OPCODE_MOV, brw_message_reg(mrf++),
+                                   src_reg(output_reg[attr]));
+
+      if ((attr == VERT_RESULT_COL0 ||
+          attr == VERT_RESULT_COL1 ||
+          attr == VERT_RESULT_BFC0 ||
+          attr == VERT_RESULT_BFC1) &&
+         c->key.clamp_vertex_color) {
+        inst->saturate = true;
+      }
 
       /* If this was MRF 15, we can't fit anything more into this URB
        * WRITE.  Note that base_mrf of 1 means that MRF 15 is an