[Mesa-dev] [PATCH 09/22] glsl: Fix calculation of std140 offset alignment for mat2s.

[Eric Anholt]

We were getting the base offset of a vec2, not of a vec2[2] like the quoted
spec text says we should.
---
 src/glsl/glsl_types.cpp |   13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/glsl/glsl_types.cpp b/src/glsl/glsl_types.cpp
index 3d78660..8e7ae42 100644
--- a/src/glsl/glsl_types.cpp
+++ b/src/glsl/glsl_types.cpp
@@ -694,14 +694,19 @@ glsl_type::std140_base_alignment(bool row_major) const
     *     row vectors with <C> components each, according to rule (4).
     */
    if (this->is_matrix()) {
-      const struct glsl_type *vec_type;
+      const struct glsl_type *vec_type, *array_type;
+      int c = this->matrix_columns;
+      int r = this->vector_elements;
+
       if (row_major) {
-	 vec_type = get_instance(GLSL_TYPE_FLOAT, this->vector_elements, 1);
+	 vec_type = get_instance(GLSL_TYPE_FLOAT, r, 1);
+	 array_type = glsl_type::get_array_instance(vec_type, c);
       } else {
-	 vec_type = get_instance(GLSL_TYPE_FLOAT, this->matrix_columns, 1);
+	 vec_type = get_instance(GLSL_TYPE_FLOAT, c, 1);
+	 array_type = glsl_type::get_array_instance(vec_type, r);
       }
 
-      return vec_type->std140_base_alignment(false);
+      return array_type->std140_base_alignment(false);
    }
 
    /* (9) If the member is a structure, the base alignment of the
-- 
1.7.10.4