webgpu triangle

interfaces/Crafter.Graphics-RTPass.cppm

@@ -46,3 +46,42 @@ export namespace Crafter {
     };
 }
 #endif // !CRAFTER_GRAPHICS_WINDOW_DOM
+
+#ifdef CRAFTER_GRAPHICS_WINDOW_DOM
+import std;
+import :RenderPass;
+import :Window;
+import :WebGPU;
+import :PipelineRTWebGPU;
+import :RenderingElement3D;
+
+export namespace Crafter {
+    // DOM-mode RT pass — dispatches the megakernel pipeline at frame Record
+    // time. Picks up the current TLAS for the frame and the application's
+    // raygen-side push data (typically empty in v1; pass via window.passes
+    // wiring if needed later).
+    struct RTPass : RenderPass {
+        PipelineRTWebGPU* pipeline;
+        // Optional per-dispatch push data forwarded after the standard
+        // RTDispatchHeader. Null means "no extra data".
+        const void*       pushPtr   = nullptr;
+        std::uint32_t     pushBytes = 0;
+
+        RTPass(PipelineRTWebGPU* p) : pipeline(p) {}
+
+        void Record(WebGPUCommandEncoderRef /*cmd*/, std::uint32_t frameIdx, Window& window) override {
+            const std::uint32_t gx = (window.width  + 7u) / 8u;
+            const std::uint32_t gy = (window.height + 7u) / 8u;
+            auto& tlas = RenderingElement3D::tlases[frameIdx];
+            WebGPU::wgpuDispatchRT(
+                pipeline->pipelineHandle,
+                pushPtr,
+                static_cast<std::int32_t>(pushBytes),
+                tlas.buffer.handle,
+                static_cast<std::int32_t>(tlas.builtInstanceCount),
+                static_cast<std::int32_t>(gx),
+                static_cast<std::int32_t>(gy));
+        }
+    };
+}
+#endif // CRAFTER_GRAPHICS_WINDOW_DOM