mesa: Introduce a compiler enum for tessellation spacing.

It feels weird using GL_* enums in a Vulkan driver.

v2: Fix the TESS_SPACING -> PIPE_TESS_SPACING conversion.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/compiler/shader_enums.h

@@ -591,6 +591,14 @@ enum gl_advanced_blend_mode
    BLEND_ALL            = 0x7fff,
 };
 
+enum gl_tess_spacing
+{
+   TESS_SPACING_UNSPECIFIED,
+   TESS_SPACING_EQUAL,
+   TESS_SPACING_FRACTIONAL_ODD,
+   TESS_SPACING_FRACTIONAL_EVEN,
+};
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif