st/mesa: simplify determination whether a draw needs min/max index

Reviewed-by: Mathias Fröhlich <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3829>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mesa/main/varray.c b/src/mesa/main/varray.c
index 7ef0de7734a..2f6aefc9ccb 100644
--- a/src/mesa/main/varray.c
+++ b/src/mesa/main/varray.c
@@ -174,6 +174,11 @@ _mesa_vertex_attrib_binding(struct gl_context *ctx,
       else
          vao->VertexAttribBufferMask &= ~array_bit;
 
+      if (vao->BufferBinding[bindingIndex].InstanceDivisor)
+         vao->NonZeroDivisorMask |= array_bit;
+      else
+         vao->NonZeroDivisorMask &= ~array_bit;
+
       vao->BufferBinding[array->BufferBindingIndex]._BoundArrays &= ~array_bit;
       vao->BufferBinding[bindingIndex]._BoundArrays |= array_bit;
 
@@ -250,6 +255,12 @@ vertex_binding_divisor(struct gl_context *ctx,
 
    if (binding->InstanceDivisor != divisor) {
       binding->InstanceDivisor = divisor;
+
+      if (divisor)
+         vao->NonZeroDivisorMask |= binding->_BoundArrays;
+      else
+         vao->NonZeroDivisorMask &= ~binding->_BoundArrays;
+
       vao->NewArrays |= vao->Enabled & binding->_BoundArrays;
    }
 }