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 <[email protected]>
Reviewed-by: Timothy Arceri <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 8 insertions, 15 deletions

diff --git a/src/mesa/state_tracker/st_program.c b/src/mesa/state_tracker/st_program.c
index 7d548d51c13..96c6bb3fcf8 100644
--- a/src/mesa/state_tracker/st_program.c
+++ b/src/mesa/state_tracker/st_program.c
@@ -1607,21 +1607,14 @@ st_translate_tesseval_program(struct st_context *st,
       ureg_property(ureg, TGSI_PROPERTY_TES_PRIM_MODE,
                     sttep->Base.info.tes.primitive_mode);
 
-   switch (sttep->Base.info.tes.spacing) {
-   case GL_EQUAL:
-      ureg_property(ureg, TGSI_PROPERTY_TES_SPACING, PIPE_TESS_SPACING_EQUAL);
-      break;
-   case GL_FRACTIONAL_EVEN:
-      ureg_property(ureg, TGSI_PROPERTY_TES_SPACING,
-                    PIPE_TESS_SPACING_FRACTIONAL_EVEN);
-      break;
-   case GL_FRACTIONAL_ODD:
-      ureg_property(ureg, TGSI_PROPERTY_TES_SPACING,
-                    PIPE_TESS_SPACING_FRACTIONAL_ODD);
-      break;
-   default:
-      assert(0);
-   }
+   STATIC_ASSERT((TESS_SPACING_EQUAL + 1) % 3 == PIPE_TESS_SPACING_EQUAL);
+   STATIC_ASSERT((TESS_SPACING_FRACTIONAL_ODD + 1) % 3 ==
+                 PIPE_TESS_SPACING_FRACTIONAL_ODD);
+   STATIC_ASSERT((TESS_SPACING_FRACTIONAL_EVEN + 1) % 3 ==
+                 PIPE_TESS_SPACING_FRACTIONAL_EVEN);
+
+   ureg_property(ureg, TGSI_PROPERTY_TES_SPACING,
+                 (sttep->Base.info.tes.spacing + 1) % 3);
 
    ureg_property(ureg, TGSI_PROPERTY_TES_VERTEX_ORDER_CW,
                  !sttep->Base.info.tes.ccw);