nir: skip lowering sampler if there is no dereference

This avoids a crash on the output of nir_lower_bitmap().

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/compiler/nir/nir_lower_samplers_as_deref.c b/src/compiler/nir/nir_lower_samplers_as_deref.c
index bdbd867..3e819f7 100644 (file)
--- a/src/compiler/nir/nir_lower_samplers_as_deref.c
+++ b/src/compiler/nir/nir_lower_samplers_as_deref.c
@@ -157,8 +157,10 @@ static bool
 lower_sampler(nir_tex_instr *instr, struct lower_samplers_as_deref_state *state,
               nir_builder *b)
 {
+   if (!instr->texture)
+      return false;
+
    /* In GLSL, we only fill out the texture field.  The sampler is inferred */
-   assert(instr->texture != NULL);
    assert(instr->sampler == NULL);
 
    b->cursor = nir_before_instr(&instr->instr);