From: Ian Romanick Date: Mon, 18 Jul 2011 23:25:33 +0000 (-0700) Subject: glsl: Treat ir_dereference_array of non-var as a constant for lowering X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=156f85336f80d542569f0b0182bd27c7f3218e70;p=mesa.git glsl: Treat ir_dereference_array of non-var as a constant for lowering Previously the code would just look at deref->array->type to see if it was a constant. This isn't good enough because deref->array might be another ir_dereference_array... of a constant. As a result, deref->array->type wouldn't be a constant, but deref->variable_referenced() would return NULL. The unchecked NULL pointer would shortly lead to a segfault. Instead just look at the return of deref->variable_referenced(). If it's NULL, assume that either a constant or some other form of anonymous temporary storage is being dereferenced. This is a bit hinkey because most drivers treat constant arrays as uniforms, but the lowering pass treats them as temporaries. This keeps the behavior of the old code, so this change isn't making things worse. Fixes i965 piglit: vs-temp-array-mat[234]-index-col-rd vs-temp-array-mat[234]-index-col-row-rd vs-uniform-array-mat[234]-index-col-rd vs-uniform-array-mat[234]-index-col-row-rd Reviewed-by: Eric Anholt --- diff --git a/src/glsl/lower_variable_index_to_cond_assign.cpp b/src/glsl/lower_variable_index_to_cond_assign.cpp index e08ec13456b..79fa58ec8d5 100644 --- a/src/glsl/lower_variable_index_to_cond_assign.cpp +++ b/src/glsl/lower_variable_index_to_cond_assign.cpp @@ -321,10 +321,16 @@ public: bool storage_type_needs_lowering(ir_dereference_array *deref) const { - if (deref->array->ir_type == ir_type_constant) + /* If a variable isn't eventually the target of this dereference, then + * it must be a constant or some sort of anonymous temporary storage. + * + * FINISHME: Is this correct? Most drivers treat arrays of constants as + * FINISHME: uniforms. It seems like this should do the same. + */ + const ir_variable *const var = deref->array->variable_referenced(); + if (var == NULL) return this->lower_temps; - const ir_variable *const var = deref->array->variable_referenced(); switch (var->mode) { case ir_var_auto: case ir_var_temporary: