i965: Add nir based intrinsic lowering and thread ID uniform

We add a lowering pass for nir intrinsics. This pass can replace nir
intrinsics with driver specific nir lower code.

We lower the gl_LocalInvocationIndex intrinsic based on a uniform
which is loaded with a thread specific ID.

We also lower the gl_LocalInvocationID based on
gl_LocalInvocationIndex.

v2:
 * Create variable during lowering pass. (Ken)

v3:
 * Don't create a variable, but instead just insert an intrisic call
   to load a uniform from the allocated location. (Jason)

v4:
 * Don't run this pass if thread_local_id_index < 0

Cc: "12.0" <[email protected]>
Signed-off-by: Jordan Justen <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 6bd28718280..975ac9eb6ba 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -6599,6 +6599,7 @@ brw_compile_cs(const struct brw_compiler *compiler, void *log_data,
               (unsigned)4 * (prog_data->thread_local_id_index + 1));
    }
 
+   brw_nir_lower_intrinsics(shader, &prog_data->base);
    shader = brw_postprocess_nir(shader, compiler->devinfo, true);
 
    prog_data->local_size[0] = shader->info.cs.local_size[0];