glsl_to_tgsi: Assert that the _mesa_sysval_to_semantic mapping is correct

Future patches will rearrange the values in gl_system_value, and I want
to catch errors.  Designated initializers would make all of this
unnecessary.

v2: Don't use STATIC_ASSERT.  Not only does it not work, but GCC doesn't
tell you that it's not going to work.  Thanks for nothing!

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 3c8aceef9ae..b4638dd6f5e 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -4904,6 +4904,21 @@ st_translate_program(
    assert(numInputs <= Elements(t->inputs));
    assert(numOutputs <= Elements(t->outputs));
 
+   assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_FRONT_FACE] ==
+          TGSI_SEMANTIC_FACE);
+   assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_VERTEX_ID] ==
+          TGSI_SEMANTIC_VERTEXID);
+   assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_INSTANCE_ID] ==
+          TGSI_SEMANTIC_INSTANCEID);
+   assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_SAMPLE_ID] ==
+          TGSI_SEMANTIC_SAMPLEID);
+   assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_SAMPLE_POS] ==
+          TGSI_SEMANTIC_SAMPLEPOS);
+   assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_SAMPLE_MASK_IN] ==
+          TGSI_SEMANTIC_SAMPLEMASK);
+   assert(_mesa_sysval_to_semantic[SYSTEM_VALUE_INVOCATION_ID] ==
+          TGSI_SEMANTIC_INVOCATIONID);
+
    t = CALLOC_STRUCT(st_translate);
    if (!t) {
       ret = PIPE_ERROR_OUT_OF_MEMORY;