[Mesa-dev] [PATCH] st/mesa: report correct precision information for low/medium/high ints

[Ilia Mirkin]

When we have native integers, these have full precision. Whether they're
low/medium/high isn't piped through the TGSI yet, but eventually those
might have differing precisions. For now they're just 32-bit ints.

Fixes the following dEQP tests:

  dEQP-GLES3.functional.state_query.shader.precision_vertex_highp_int
  dEQP-GLES3.functional.state_query.shader.precision_fragment_highp_int

which expected highp ints to have full 32-bit precision, not the default
23-bit float precision.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 src/mesa/state_tracker/st_extensions.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index e41878d..370cc2d 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -253,6 +253,13 @@ void st_init_limits(struct pipe_screen *screen,
       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 
+      if (screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_INTEGERS)) {
+         pc->LowInt.RangeMin = 31;
+         pc->LowInt.RangeMax = 30;
+         pc->LowInt.Precision = 0;
+         pc->MediumInt = pc->HighInt = pc->LowInt;
+      }
+
       options->EmitNoNoise = TRUE;
 
       /* TODO: make these more fine-grained if anyone needs it */
-- 
2.7.3