glsl: fix xfb_offset unsized array validation

This partially fixes CTS test:
GL44-CTS.enhanced_layouts.xfb_get_program_resource_api

The test now fails at a tes evaluation shader with unsized output arrays.

The ARB_enhanced_layouts spec says:

   "It is a compile-time error to apply xfb_offset to the declaration of an
   unsized array."

So this seems like a bug in the CTS.

Reviewed-by: Dave Airlie <[email protected]>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/compiler/glsl/ir.cpp b/src/compiler/glsl/ir.cpp
index 5bb3ac3c214..70859a7bd9d 100644
--- a/src/compiler/glsl/ir.cpp
+++ b/src/compiler/glsl/ir.cpp
@@ -2021,3 +2021,26 @@ mode_string(const ir_variable *var)
    assert(!"Should not get here.");
    return "invalid variable";
 }
+
+/**
+ * Get the varying type stripped of the outermost array if we're processing
+ * a stage whose varyings are arrays indexed by a vertex number (such as
+ * geometry shader inputs).
+ */
+const glsl_type *
+get_varying_type(const ir_variable *var, gl_shader_stage stage)
+{
+   const glsl_type *type = var->type;
+
+   if (!var->data.patch &&
+       ((var->data.mode == ir_var_shader_out &&
+         stage == MESA_SHADER_TESS_CTRL) ||
+        (var->data.mode == ir_var_shader_in &&
+         (stage == MESA_SHADER_TESS_CTRL || stage == MESA_SHADER_TESS_EVAL ||
+          stage == MESA_SHADER_GEOMETRY)))) {
+      assert(type->is_array());
+      type = type->fields.array;
+   }
+
+   return type;
+}