Fix CUDA prelude for makeMatrix (shader-slang#5509)

* Fix CUDA prelude for makeMatrix

* Add regression test.

Author: csyonghe

prelude/slang-cuda-prelude.h

@@ -733,12 +733,12 @@ SLANG_FORCE_INLINE SLANG_CUDA_CALL Matrix<T, ROWS, COLS> makeMatrix(
     Matrix<T, ROWS, COLS> rs;
     if (COLS == 3)
     {
-        rs.rows[0].x = v0;
-        rs.rows[0].y = v1;
-        rs.rows[0].z = v2;
-        rs.rows[1].x = v3;
-        rs.rows[1].y = v4;
-        rs.rows[1].z = v5;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 0) = v0;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 1) = v1;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 2) = v2;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 0) = v3;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 1) = v4;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 2) = v5;
     }
     else
     {
@@ -766,14 +766,14 @@ SLANG_FORCE_INLINE SLANG_CUDA_CALL Matrix<T, ROWS, COLS> makeMatrix(
     Matrix<T, ROWS, COLS> rs;
     if (COLS == 4)
     {
-        rs.rows[0].x = v0;
-        rs.rows[0].y = v1;
-        rs.rows[0].z = v2;
-        rs.rows[0].w = v3;
-        rs.rows[1].x = v4;
-        rs.rows[1].y = v5;
-        rs.rows[1].z = v6;
-        rs.rows[1].w = v7;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 0) = v0;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 1) = v1;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 2) = v2;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 3) = v3;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 0) = v4;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 1) = v5;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 2) = v6;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 3) = v7;
     }
     else
     {
@@ -832,18 +832,18 @@ SLANG_FORCE_INLINE SLANG_CUDA_CALL Matrix<T, ROWS, COLS> makeMatrix(
     Matrix<T, ROWS, COLS> rs;
     if (COLS == 4)
     {
-        rs.rows[0].x = v0;
-        rs.rows[0].y = v1;
-        rs.rows[0].z = v2;
-        rs.rows[0].w = v3;
-        rs.rows[1].x = v4;
-        rs.rows[1].y = v5;
-        rs.rows[1].z = v6;
-        rs.rows[1].w = v7;
-        rs.rows[2].x = v8;
-        rs.rows[2].y = v9;
-        rs.rows[2].z = v10;
-        rs.rows[2].w = v11;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 0) = v0;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 1) = v1;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 2) = v2;
+        *_slang_vector_get_element_ptr(&rs.rows[0], 3) = v3;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 0) = v4;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 1) = v5;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 2) = v6;
+        *_slang_vector_get_element_ptr(&rs.rows[1], 3) = v7;
+        *_slang_vector_get_element_ptr(&rs.rows[2], 0) = v8;
+        *_slang_vector_get_element_ptr(&rs.rows[2], 1) = v9;
+        *_slang_vector_get_element_ptr(&rs.rows[2], 2) = v10;
+        *_slang_vector_get_element_ptr(&rs.rows[2], 3) = v11;
     }
     else
     {

tests/cuda/make-matrix.slang

@@ -0,0 +1,14 @@
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -compute 
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cuda -compute 
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<uint4x3> outputBuffer : register(u0);
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint idx = dispatchThreadID.x + 1;
+    uint4x3 mat1 = uint4x3(idx, idx, idx, idx, idx, idx, idx, idx, idx, idx, idx, idx);
+    outputBuffer[0] = mat1;
+    // CHECK: 1
+}