st/mesa: tex offsets can't be in a const or 2d-indexed

All consts are now implicitly 2d (they set .Dimension), so trigger
asserts. Also, the texture offset can't handle any sort of 2d indexing.
While this could be tacked on, this seems unnecessary, just move it off
into a separate temp.

Fixes assertion failure in
tests/spec/arb_gpu_shader5/compiler/builtin-functions/fs-gatherOffset-uniform-offset.frag

Note that this was an issue even before the const-always-2d thing, since
there was no detection of when even a proper second dimension was used,
e.g. for UBO or geom/tess inputs.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 5f7a0dcd3e8..01a58d7d2c6 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -4096,7 +4096,11 @@ glsl_to_tgsi_visitor::get_deref_offsets(ir_dereference *ir,
 st_src_reg
 glsl_to_tgsi_visitor::canonicalize_gather_offset(st_src_reg offset)
 {
-   if (offset.reladdr || offset.reladdr2) {
+   if (offset.reladdr || offset.reladdr2 ||
+       offset.has_index2 ||
+       offset.file == PROGRAM_UNIFORM ||
+       offset.file == PROGRAM_CONSTANT ||
+       offset.file == PROGRAM_STATE_VAR) {
       st_src_reg tmp = get_temp(glsl_type::ivec2_type);
       st_dst_reg tmp_dst = st_dst_reg(tmp);
       tmp_dst.writemask = WRITEMASK_XY;