First Commit

externals/glslang/Test/hlsl.matrixindex.frag

@@ -0,0 +1,49 @@
+uniform int      idx;
+uniform float3x2 um;
+
+struct PS_OUTPUT
+{
+    float4 Color : SV_Target0;
+};
+
+PS_OUTPUT main()
+{
+    // matrices of 3 rows, 2 columns (regardless of row vs col major storage)
+    const float3x2 m1 = { { 10, 11 },  // row-wise initialization
+                          { 12, 13 },
+                          { 14, 15 } }; 
+
+    const float3x2 m2 = { 20, 21, 22, 23, 24, 25 };  // component-wise matrix initialization is allowed
+    const float3x2 m3 = { 30, 31, 33, 33, 34, 35 };  // component-wise matrix initialization is allowed
+
+    // These can be observed in the AST post-const folding to ensure we obtain the right value,
+    // as given in comments to the right of each line.  Note that the first indirection into a
+    // matrix returns a row vector.
+    float e1_00 = m1[0][0]; // 10
+    float e1_01 = m1[0][1]; // 11
+    float e1_10 = m1[1][0]; // 12
+    float e1_11 = m1[1][1]; // 13
+    float e1_20 = m1[2][0]; // 14
+    float e1_21 = m1[2][1]; // 15
+
+    float e2_00 = m2[0][0]; // 20
+    float e2_01 = m2[0][1]; // 21
+    float e2_10 = m2[1][0]; // 22
+    float e2_11 = m2[1][1]; // 23
+    float e2_20 = m2[2][0]; // 24
+    float e2_21 = m2[2][1]; // 25
+
+    // float e3a_00 = m3._m00; // TODO... also as an lvalue for a non-const matrix
+    // float e3b_00 = m3._11;  // TODO... also as an lvalue for a non-const matrix
+
+    float2 r0a = m1[0];  // row0: 10,11: types must match: constant index into constant
+    float2 r1a = m1[1];  // row1: 12,13: ...
+    float2 r2a = m1[2];  // row2: 14,15: ...
+
+    float2 r0b = m2[idx]; // types should match: variable index into constant
+    float2 r0c = um[idx]; // types should match: variable index into variable
+
+    PS_OUTPUT psout;
+    psout.Color = e2_11; // 23
+    return psout;
+}