Experimental DXR1.0 support in gfx. (#1915)

* Experimental DXR1.0 support in gfx.

- Add `dispatchRays` command.
- Add `createRayTracingPipelineState` method to construct a D3D ray tracing state object from a linked slang program and user specified shader table.

Limitations/simplifications: no local root signature support, shader table entries contains only shader identifiers and is specified at pipeline creation time, owned by the pipeline state object.

* Root object binding for raytracing pipelines.

* `maybeSpecializePipeline` implementation for raytracing pipelines.

* Add ray-tracing-pipeline example.

* Fixes.

* Update README.md

* Update comments on the lifespan of specialized pipelines

Co-authored-by: Yong He <yhe@nvidia.com>
Co-authored-by: jsmall-nvidia <jsmall@nvidia.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/tools/gfx/debug-layer.cpp b/tools/gfx/debug-layer.cpp
index 067581559..50cacc6c2 100644
--- a/tools/gfx/debug-layer.cpp
+++ b/tools/gfx/debug-layer.cpp
@@ -705,6 +705,7 @@ DebugCommandBuffer::DebugCommandBuffer()
     m_renderCommandEncoder.commandBuffer = this;
     m_computeCommandEncoder.commandBuffer = this;
     m_resourceCommandEncoder.commandBuffer = this;
+    m_rayTracingCommandEncoder.commandBuffer = this;
 }
 
 void DebugCommandBuffer::encodeRenderCommands(
@@ -1084,6 +1085,25 @@ void DebugRayTracingCommandEncoder::memoryBarrier(
     baseObject->memoryBarrier(count, innerAS.getBuffer(), sourceAccess, destAccess);
 }
 
+void DebugRayTracingCommandEncoder::bindPipeline(
+    IPipelineState* state, IShaderObject** outRootObject)
+{
+    SLANG_GFX_API_FUNC;
+    auto innerPipeline = getInnerObj(state);
+    baseObject->bindPipeline(innerPipeline, commandBuffer->rootObject.baseObject.writeRef());
+    *outRootObject = &commandBuffer->rootObject;
+}
+
+void DebugRayTracingCommandEncoder::dispatchRays(
+    const char* rayGenShaderName,
+    int32_t width,
+    int32_t height,
+    int32_t depth)
+{
+    SLANG_GFX_API_FUNC;
+    baseObject->dispatchRays(rayGenShaderName, width, height, depth);
+}
+
 const ICommandQueue::Desc& DebugCommandQueue::getDesc()
 {
     SLANG_GFX_API_FUNC;