glsl: lower gl_TessLevel* from float[n] to vecn.

Similar to gl_ClipDistance -> gl_ClipDistanceMESA

v2: - renamed is_mesa_var to lowered_builtin_array_variable
    - moved LowerTessLevel into gl_constants
    - cosmetic changes in lower_tess_level.cpp

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 9 insertions, 4 deletions

diff --git a/src/glsl/link_varyings.h b/src/glsl/link_varyings.h
index afc16a8baa7..c0ad53bf1da 100644
--- a/src/glsl/link_varyings.h
+++ b/src/glsl/link_varyings.h
@@ -128,7 +128,7 @@ public:
     */
    unsigned num_components() const
    {
-      if (this->is_clip_distance_mesa)
+      if (this->lowered_builtin_array_variable)
          return this->size;
       else
          return this->vector_elements * this->matrix_columns * this->size;
@@ -161,10 +161,15 @@ private:
    unsigned array_subscript;
 
    /**
-    * True if the variable is gl_ClipDistance and the driver lowers
-    * gl_ClipDistance to gl_ClipDistanceMESA.
+    * Non-zero if the variable is gl_ClipDistance, glTessLevelOuter or
+    * gl_TessLevelInner and the driver lowers it to gl_*MESA.
     */
-   bool is_clip_distance_mesa;
+   enum {
+      none,
+      clip_distance,
+      tess_level_outer,
+      tess_level_inner,
+   } lowered_builtin_array_variable;
 
    /**
     * The vertex shader output location that the linker assigned for this