i965: Fix vector splitting RHS channel selection with sparse writemasks.

Fixes:
glsl-fs-all-02
glsl-fs-dot-vec2

diff --git a/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp b/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp
index 83b4af0..552254d 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp
@@ -264,8 +264,10 @@ ir_vector_splitting_visitor::visit_leave(ir_assignment *ir)
    variable_entry *rhs = rhs_deref ? get_splitting_entry(rhs_deref->var) : NULL;
 
    if (lhs_deref && rhs_deref && (lhs || rhs) && !ir->condition) {
+      unsigned int rhs_chan = 0;
+
       /* Straight assignment of vector variables. */
-      for (unsigned int i = 0; i < ir->rhs->type->vector_elements; i++) {
+      for (unsigned int i = 0; i < ir->lhs->type->vector_elements; i++) {
         ir_dereference *new_lhs;
         ir_rvalue *new_rhs;
         void *mem_ctx = lhs ? lhs->mem_ctx : rhs->mem_ctx;
@@ -283,15 +285,18 @@ ir_vector_splitting_visitor::visit_leave(ir_assignment *ir)
         }
 
         if (rhs) {
-           new_rhs = new(mem_ctx) ir_dereference_variable(rhs->components[i]);
+           new_rhs =
+              new(mem_ctx) ir_dereference_variable(rhs->components[rhs_chan]);
         } else {
            new_rhs = new(mem_ctx) ir_swizzle(ir->rhs->clone(mem_ctx, NULL),
-                                             i, i, i, i, 1);
+                                             rhs_chan, 0, 0, 0, 1);
         }
 
         ir->insert_before(new(mem_ctx) ir_assignment(new_lhs,
                                                      new_rhs,
                                                      NULL, writemask));
+
+        rhs_chan++;
       }
       ir->remove();
    } else if (lhs) {