nir/intrinsics: Add a vulkan_resource_index intrinsic

This is used to facilitate the Vulkan binding model where each resource is
described by a (descriptor set, binding, array index) tuple.

Reviewed-by: Rob Clark <robdclark@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/compiler/nir/nir_intrinsics.h b/src/compiler/nir/nir_intrinsics.h
index 05507dc..66a169c 100644
--- a/src/compiler/nir/nir_intrinsics.h
+++ b/src/compiler/nir/nir_intrinsics.h
@@ -176,6 +176,26 @@ INTRINSIC(image_samples, 0, ARR(0), true, 1, 1, 0, xx, xx, xx,
           NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
 
 /*
+ * Vulkan descriptor set intrinsic
+ *
+ * The Vulkan API uses a different binding model from GL.  In the Vulkan
+ * API, all external resources are represented by a tuple:
+ *
+ * (descriptor set, binding, array index)
+ *
+ * where the array index is the only thing allowed to be indirect.  The
+ * vulkan_surface_index intrinsic takes the descriptor set and binding as
+ * its first two indices and the array index as its source.  The third
+ * index is a nir_variable_mode in case that's useful to the backend.
+ *
+ * The intended usage is that the shader will call vulkan_surface_index to
+ * get an index and then pass that as the buffer index ubo/ssbo calls.
+ */
+INTRINSIC(vulkan_resource_index, 1, ARR(1), true, 1, 0, 2,
+          DESC_SET, BINDING, xx,
+          NIR_INTRINSIC_CAN_ELIMINATE | NIR_INTRINSIC_CAN_REORDER)
+
+/*
  * variable atomic intrinsics
  *
  * All of these variable atomic memory operations read a value from memory,