GLSL half texture access (#931)

* * Added $c macro - that will do casting to target type. Used here to cast texture reads back to half. Works in tandem with $z which will close parens.
* half-texture.slang test
* Make binding failing if TextureView fails

* Simplify logic around parens.

* Improve comment around $c macro.

* Test against hlsl output to avoid error on CI.

1 files changed, 51 insertions, 0 deletions

diff --git a/tests/compute/half-texture.slang.1.expected b/tests/compute/half-texture.slang.1.expected
new file mode 100644
index 000000000..5d3f84e74
--- /dev/null
+++ b/tests/compute/half-texture.slang.1.expected
@@ -0,0 +1,51 @@
+result code = 0
+standard error = {
+}
+standard output = {
+#pragma pack_matrix(column_major)
+
+#line 18 "tests/compute/half-texture.slang"
+RWTexture2D<half > halfTexture_0 : register(u1);
+
+
+#line 30
+RWTexture2D<vector<half,2> > halfTexture2_0 : register(u2);
+
+
+#line 31
+RWTexture2D<vector<half,4> > halfTexture4_0 : register(u3);
+
+
+#line 40
+RWStructuredBuffer<int > outputBuffer_0 : register(u0);
+
+
+#line 18
+[shader("compute")][numthreads(4, 4, 1)]
+void computeMain(vector<uint,3> dispatchThreadID_0 : SV_DISPATCHTHREADID)
+{
+
+#line 20
+    vector<int,2> pos_0 = (vector<int,2>) dispatchThreadID_0.xy;
+    float _S1 = 1.00000000000000000000 / 3.00000000000000000000;
+    vector<int,2> pos2_0 = vector<int,2>(3 - pos_0.y, 3 - pos_0.x);
+
+#line 29
+    half h_0 = halfTexture_0[(vector<uint,2>) pos2_0];
+    vector<half,2> h2_0 = halfTexture2_0[(vector<uint,2>) pos2_0];
+    vector<half,4> h4_0 = halfTexture4_0[(vector<uint,2>) pos2_0];
+
+
+
+    halfTexture_0[(vector<uint,2>) pos_0] = h2_0.x + h2_0.y;
+    halfTexture2_0[(vector<uint,2>) pos_0] = h4_0.xy;
+    halfTexture4_0[(vector<uint,2>) pos_0] = vector<half,4>(h2_0, h_0, h_0);
+
+    int index_0 = pos_0.x + pos_0.y * 4;
+    outputBuffer_0[(uint) index_0] = index_0;
+
+#line 18
+    return;
+}
+
+}