draw: hack around weird primitive id input in gs

The distinction between system values and ordinary inputs is not very
obvious in gallium - further fueled by the fact that they use the same
semantic names.
Still, if there's any value which imho really is a system value, it's the
primitive id input into the gs (while earlier (tessleation) stages could read
it, it is _always_ generated by the system). For some odd reason though (which
I'd classify as a bug but seems too complicated to fix) the glsl compiler in
mesa treats this as an ordinary varying, and everything else after that
(including the state tracker and other drivers) just go along with that.
But input fetching in gs for llvm based draw was definitely limited to the
ordinary (2-dimensional) inputs so only worked with other state trackers,
the code was also additionally relying on tgsi_scan_shader filling
uses_primid correctly which did not happen neither (would set it only for
all stages if it was a system value, but only set it for the fragment shader
if it was an input value).
This fixes piglit glsl-1.50-geometry-primitive-id-restart and primitive-id-in
in llvmpipe.

Reviewed-by: Brian Paul <[email protected]>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/draw/draw_gs.c b/src/gallium/auxiliary/draw/draw_gs.c
index 2b6d2a02821..bbf515a9525 100644
--- a/src/gallium/auxiliary/draw/draw_gs.c
+++ b/src/gallium/auxiliary/draw/draw_gs.c
@@ -228,8 +228,7 @@ llvm_fetch_gs_input(struct draw_geometry_shader *shader,
    const float (*input_ptr)[4];
    float (*input_data)[6][PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS][TGSI_NUM_CHANNELS] = &shader->gs_input->data;
 
-   shader->llvm_prim_ids[shader->fetched_prim_count] =
-      shader->in_prim_idx;
+   shader->llvm_prim_ids[shader->fetched_prim_count] = shader->in_prim_idx;
 
    input_ptr = shader->input;
 
@@ -244,6 +243,11 @@ llvm_fetch_gs_input(struct draw_geometry_shader *shader,
       for (slot = 0, vs_slot = 0; slot < shader->info.num_inputs; ++slot) {
          if (shader->info.input_semantic_name[slot] == TGSI_SEMANTIC_PRIMID) {
             /* skip. we handle system values through gallivm */
+            /* NOTE: If we hit this case here it's an ordinary input not a sv,
+             * even though it probably should be a sv.
+             * Not sure how to set it up as regular input however if that even,
+             * would make sense so hack around this later in gallivm.
+             */
          } else {
             vs_slot = draw_gs_get_input_index(
                shader->info.input_semantic_name[slot],