[matrix] Fix the the row\col indexing (#491)

Two is the row max size.

Author: farzonl

test/Basic/matrix_scalar_arithmetic.test

@@ -11,12 +11,13 @@ void main(uint GI : SV_GroupIndex) {
   int2x3 A = int2x3(In[0], In[1], In[2], 
                     In[3], In[4], In[5]); 
 
-  int row = GI / 2;
-  int col = GI % 2;
-  DivOut[GI] = A[col][row] / 2;
-  MulOut[GI] = A[col][row] * 2;
-  AddOut[GI] = A[col][row] + 1;
-  SubOut[GI] = A[col][row] - 1;
+  const uint COLS = 3;          // int2x3 => 2 rows, 3 columns
+  uint row = GI / COLS;         // 0..1
+  uint col = GI % COLS;         // 0..2
+  DivOut[GI] = A[row][col] / 2;
+  MulOut[GI] = A[row][col] * 2;
+  AddOut[GI] = A[row][col] + 1;
+  SubOut[GI] = A[row][col] - 1;
 }
 
 //--- pipeline.yaml
@@ -92,13 +93,13 @@ DescriptorSets:
 # CHECK: Data: [ 2, 4, 6, 8, 10, 12 ]
 # CHECK: Name: DivOut
 # CHECK: Format: Int32
-# CHECK: Data: [ 1, 4, 2, 5, 3, 6 ]
+# CHECK: Data: [ 1, 2, 3, 4, 5, 6 ]
 # CHECK: Name: MulOut
 # CHECK: Format: Int32
-# CHECK: Data: [ 4, 16, 8, 20, 12, 24 ]
+# CHECK: Data: [ 4, 8, 12, 16, 20, 24 ]
 # CHECK: Name: AddOut
 # CHECK: Format: Int32
-# CHECK: Data: [ 3, 9, 5, 11, 7, 13 ]
+# CHECK: Data: [ 3, 5, 7, 9, 11, 13 ]
 # CHECK: Name: SubOut
 # CHECK: Format: Int32
-# CHECK: Data: [ 1, 7, 3, 9, 5, 11 ]
+# CHECK: Data: [ 1, 3, 5, 7, 9, 11 ]

test/Basic/matrix_scalar_constructor.test

@@ -8,9 +8,11 @@ void main(uint GI : SV_GroupIndex) {
   int2x3 A = int2x3(In[0], In[1], In[2],
                     In[3], In[4], In[5]);
 
-  int row = GI / 2;
-  int col = GI % 2;
-  Out[GI] = A[col][row];
+  const uint COLS = 3;          // int2x3 => 2 rows, 3 columns
+  uint row = GI / COLS;         // 0..1
+  uint col = GI % COLS;         // 0..2
+
+  Out[GI] = A[row][col];
 }
 
 //--- pipeline.yaml
@@ -29,7 +31,7 @@ Buffers:
     FillSize: 24
   - Name: ExpectedOut
     Format: Int32
-    Data: [ 1, 4, 2, 5, 3, 6 ]
+    Data: [ 1, 2, 3, 4, 5, 6 ]
 Results:
   - Result: Out
     Rule: BufferExact