Added handling of non-struct ParamBlock writes

Author: tdavidovicNV

slangpy/tests/device/test_shader_cursor.py

@@ -123,6 +123,7 @@ class Var:
     "u_float2x4": Var(kind="matrix", type="float", value=[[0, 1, 2, 3], [4, 5, 6, 7]]),
     "u_float3x4": Var(kind="matrix", type="float", value=[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11]]),
     "u_float4x4": Var(kind="matrix", type="float", value=[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15]]),
+    "pb_float4x4": Var(kind="matrix", type="float", value=[[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15]]),
     # float16_t
     "u_float16_t": Var(kind="scalar", type="float16_t", value=1.2345),
     "u_float16_t_min": Var(kind="scalar", type="float16_t", value=FLOAT16_MIN),

slangpy/tests/device/test_shader_cursor.slang

@@ -85,6 +85,7 @@ uniform float3x3 u_float3x3;
 uniform float2x4 u_float2x4;
 uniform float3x4 u_float3x4;
 uniform float4x4 u_float4x4;
+ParameterBlock<float4x4> pb_float4x4;
 
 uniform float16_t u_float16_t;
 uniform float16_t u_float16_t_min;
@@ -260,6 +261,7 @@ void compute_main(uint3 tid: SV_DispatchThreadID)
     writer.write(u_float2x4);
     writer.write(u_float3x4);
     writer.write(u_float4x4);
+    writer.write(pb_float4x4);
 
     writer.write(u_float16_t);
     writer.write(u_float16_t_min);

src/slangpy_ext/device/cursor_utils.h

@@ -687,8 +687,14 @@ class WriteConverterTable {
         }
         case TypeReflection::Kind::constant_buffer:
         case TypeReflection::Kind::parameter_block:
+            if constexpr (requires { self.dereference(); }) {
+                // Unwrap constant buffers or parameter blocks for shader cursors
+                auto child = self.dereference();
+                write_internal(child, nbval);
+                return;
+            } else
+                SGL_THROW("constant_buffer and param_block not expected in BufferElementCursor");
         case TypeReflection::Kind::struct_: {
-            // Unwrap constant buffers or parameter blocks
             if (kind != TypeReflection::Kind::struct_)
                 type_layout = type_layout->getElementTypeLayout();