Simple test profiling (#1062)

* First pass support for performance profiling

* Test across all elements

* Fix bug - sourceContents is not used, should use rawSource.

* * Add ability to get prelude from API.
* Allow specifying source language for render-test
* Made it possible to compile a test input file as C++
  * Special handling for reflection
* Added C++ impl to performance-profile.slang

* Remove some clang warnings.

* Output profile timings on appveyor and other TC.

* Remove passing around of StdWriters (can use global).
Small comment improvements.

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/compute/performance-profile.slang b/tests/compute/performance-profile.slang
new file mode 100644
index 000000000..6ec8ecd94
--- /dev/null
+++ b/tests/compute/performance-profile.slang
@@ -0,0 +1,52 @@
+//TEST(compute):PERFORMANCE_PROFILE:-cpu -compute -compile-arg -O3 -compute-dispatch 256,1,1 
+//TEST(compute):PERFORMANCE_PROFILE:-cpu -compute -source-language cpp -compile-arg -O3 -compute-dispatch 256,1,1 
+//TEST(compute):PERFORMANCE_PROFILE:-slang -compute -compute-dispatch 256,1,1
+//TEST(compute):PERFORMANCE_PROFILE:-slang -compute -dx12 -compute-dispatch 256,1,1
+//TEST(compute, vulkan):PERFORMANCE_PROFILE:-vk -compute -compute-dispatch 256,1,1
+
+//TEST_INPUT:ubuffer(random(float, 4096, -1, 1), stride=4):dxbinding(0),glbinding(0),out,name outputBuffer
+
+#ifndef __cplusplus
+
+RWStructuredBuffer<float> outputBuffer;
+
+[numthreads(16, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint i = dispatchThreadID.x;
+    float v = outputBuffer[i];
+    v = v < 0.0f ? (v * v) : (v + v + v);
+	outputBuffer[i] = v;
+}
+
+
+#else
+
+namespace { // anonymous
+
+struct LocalUniformState
+{
+    RWStructuredBuffer<float> outputBuffer_0;
+};
+
+} // anonymous
+
+static void _calc(const RWStructuredBuffer<float>& buf, int start, int end)
+{
+    assert(start >= 0 && end <= buf.count);
+    float* data = buf.data;
+    
+    for (int i = start; i < end; ++i)
+    {
+        float v = data[i];
+        data[i] = v < 0.0f ? (v * v) : (v + v + v);
+    }
+}
+
+SLANG_PRELUDE_EXPORT
+void computeMain(ComputeVaryingInput* varyingInput, UniformEntryPointParams* params, LocalUniformState* uniformState)
+{
+    _calc(uniformState->outputBuffer_0, varyingInput->startGroupID.x * 16, varyingInput->endGroupID.x * 16);
+}
+ 
+#endif
\ No newline at end of file