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-rw-r--r--src/mesa/drivers/dri/i965/brw_fs.cpp13
1 files changed, 12 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 366d9ffbffb..4b29ee52883 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1189,7 +1189,18 @@ fs_visitor::emit_general_interpolation(fs_reg *attr, const char *name,
* handed us defined values in only the constant offset
* field of the setup reg.
*/
- for (unsigned int i = 0; i < type->vector_elements; i++) {
+ unsigned vector_elements = type->vector_elements;
+
+ /* Data starts at suboffet 3 in 32-bit units (12 bytes), so it is not
+ * 64-bit aligned and the current implementation fails to read the
+ * data properly. Instead, when there is is a double input varying,
+ * read it as vector of floats with twice the number of components.
+ */
+ if (attr->type == BRW_REGISTER_TYPE_DF) {
+ vector_elements *= 2;
+ attr->type = BRW_REGISTER_TYPE_F;
+ }
+ for (unsigned int i = 0; i < vector_elements; i++) {
struct brw_reg interp = interp_reg(*location, i);
interp = suboffset(interp, 3);
interp.type = attr->type;