Vulkan update/NVAPI support (#1511)

* First pass at incorporating nvapi into test harness.

* D3d12 Atomic Float Add via NVAPI working

* Dx12 atomic float appears to work.

* Atomic float add on Dx12.

* Added atomic64 feature addition to vk.
Fix correct output for atomic-float-byte-address.slang

* Disable atomic float failing tests.

* Upgraded VK headers.

* Detect atomic float availability on VK.

* Try to get test working for in64 atomic.

* Made HLSL prelude controlled via the render-test requirements.

* Added -enable-nvapi to premake.

* Fix D3D12Renderer when NVAPI is not available.

* Small improvements to VKRenderer.

* Improve atomic documentation in target-compatibility.md.

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/gfx/nvapi/nvapi-util.cpp b/tools/gfx/nvapi/nvapi-util.cpp
new file mode 100644
index 000000000..63bcc65fc
--- /dev/null
+++ b/tools/gfx/nvapi/nvapi-util.cpp
@@ -0,0 +1,30 @@
+#include "nvapi-util.h"
+
+#include "nvapi-include.h"
+
+namespace gfx {
+
+static SlangResult g_initStatus = SLANG_E_UNINITIALIZED;
+
+/* static */SlangResult NVAPIUtil::initialize()
+{
+#ifdef GFX_NVAPI
+    if (g_initStatus == SLANG_E_UNINITIALIZED)
+    {
+        NvAPI_Status ret = NVAPI_OK;
+        ret = NvAPI_Initialize();
+        g_initStatus = (ret == NVAPI_OK) ? SLANG_OK : SLANG_E_NOT_AVAILABLE;
+    }
+#else
+    g_initStatus = SLANG_E_NOT_AVAILABLE;
+#endif
+
+    return g_initStatus;
+}
+
+/* static */bool NVAPIUtil::isAvailable()
+{
+    return SLANG_SUCCEEDED(g_initStatus);
+}
+
+} // gfx