glsl: do not allow implicit casts of unsized array initializers

The GLSL 4.6 specification (section 4.1.14. "Implicit Conversions")
says:

  "There are no implicit array or structure conversions. For
   example, an array of int cannot be implicitly converted to an
   array of float."

So let's add a check in place when assigning array initializers to
implicitly sized arrays, to avoid incorrectly allowing code on the
form:

int[] foo = float[](1.0, 2.0, 3.0)

This fixes the following dEQP test-cases:
- dEQP-GLES31.functional.shaders.implicit_conversions.es31.invalid.arrays.int_to_float_vertex
- dEQP-GLES31.functional.shaders.implicit_conversions.es31.invalid.arrays.int_to_float_fragment
- dEQP-GLES31.functional.shaders.implicit_conversions.es31.invalid.arrays.int_to_uint_vertex
- dEQP-GLES31.functional.shaders.implicit_conversions.es31.invalid.arrays.int_to_uint_fragment
- dEQP-GLES31.functional.shaders.implicit_conversions.es31.invalid.arrays.uint_to_float_vertex
- dEQP-GLES31.functional.shaders.implicit_conversions.es31.invalid.arrays.uint_to_float_fragment
- dEQP-GLES31.functional.shaders.implicit_conversions.es32.invalid.arrays.int_to_float_vertex
- dEQP-GLES31.functional.shaders.implicit_conversions.es32.invalid.arrays.int_to_float_fragment
- dEQP-GLES31.functional.shaders.implicit_conversions.es32.invalid.arrays.int_to_uint_vertex
- dEQP-GLES31.functional.shaders.implicit_conversions.es32.invalid.arrays.int_to_uint_fragment
- dEQP-GLES31.functional.shaders.implicit_conversions.es32.invalid.arrays.uint_to_float_vertex
- dEQP-GLES31.functional.shaders.implicit_conversions.es32.invalid.arrays.uint_to_float_fragment

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

diff --git a/src/compiler/glsl/ast_to_hir.cpp b/src/compiler/glsl/ast_to_hir.cpp
index 7f30a7088551883b7be9aa1295ac50b00704aaa7..7671041a4544c535fc808132ac254a5962bdb012 100644 (file)
--- a/src/compiler/glsl/ast_to_hir.cpp
+++ b/src/compiler/glsl/ast_to_hir.cpp
@@ -891,7 +891,8 @@ validate_assignment(struct _mesa_glsl_parse_state *state,
    }
    if (unsized_array) {
       if (is_initializer) {
-         return rhs;
+         if (rhs->type->get_scalar_type() == lhs->type->get_scalar_type())
+            return rhs;
       } else {
          _mesa_glsl_error(&loc, state,
                           "implicitly sized arrays cannot be assigned");