compiler/nir: Add conditional lowering for gl_BaseVertex

Reviewed-by: Jason Ekstrand <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index f8e71d54a50..ec3dbf035c0 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -1930,6 +1930,12 @@ typedef struct nir_shader_compiler_options {
    /* Indicates that the driver only has zero-based vertex id */
    bool vertex_id_zero_based;
 
+   /**
+    * If enabled, gl_BaseVertex will be lowered as:
+    * is_indexed_draw (~0/0) & firstvertex
+    */
+   bool lower_base_vertex;
+
    bool lower_cs_local_index_from_id;
 
    bool lower_device_index_to_zero;