mesa: Fix linker-assigned varying component counting since 8fb1e4a462

[mesa.git] / src / glsl / ir_builder.cpp

diff --git a/src/glsl/ir_builder.cpp b/src/glsl/ir_builder.cpp
index fc6ee96a3318225650a8b70c029a574e5bc3c10f..c62f0b115bb5066711a53f40c8de9ec402111878 100644 (file)
--- a/src/glsl/ir_builder.cpp
+++ b/src/glsl/ir_builder.cpp
@@ -76,6 +76,21 @@ swizzle(operand a, int swizzle, int components)
                                  components);
 }
 
+ir_swizzle *
+swizzle_for_size(operand a, unsigned components)
+{
+   void *mem_ctx = ralloc_parent(a.val);
+
+   if (a.val->type->vector_elements < components)
+      components = a.val->type->vector_elements;
+
+   unsigned s[4] = { 0, 1, 2, 3 };
+   for (int i = components; i < 4; i++)
+      s[i] = components - 1;
+
+   return new(mem_ctx) ir_swizzle(a.val, s, components);
+}
+
 ir_swizzle *
 swizzle_xxxx(operand a)
 {