+ if (!is_parameter && is_varying_var(var, state->target)) {
+ /* This variable is being used to link data between shader stages (in
+ * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
+ * that is allowed for such purposes.
+ *
+ * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "The varying qualifier can be used only with the data types
+ * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
+ * these."
+ *
+ * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
+ * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
+ *
+ * "Fragment inputs can only be signed and unsigned integers and
+ * integer vectors, float, floating-point vectors, matrices, or
+ * arrays of these. Structures cannot be input.
+ *
+ * Similar text exists in the section on vertex shader outputs.
+ *
+ * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
+ * 3.00 spec allows structs as well. Varying structs are also allowed
+ * in GLSL 1.50.
+ */
+ switch (var->type->get_scalar_type()->base_type) {
+ case GLSL_TYPE_FLOAT:
+ /* Ok in all GLSL versions */
+ break;
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ if (state->is_version(130, 300))
+ break;
+ _mesa_glsl_error(loc, state,
+ "varying variables must be of base type float in %s",
+ state->get_version_string());
+ break;
+ case GLSL_TYPE_STRUCT:
+ if (state->is_version(150, 300))
+ break;
+ _mesa_glsl_error(loc, state,
+ "varying variables may not be of type struct");
+ break;
+ default:
+ _mesa_glsl_error(loc, state, "illegal type for a varying variable");
+ break;
+ }
+ }
+