85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
/*
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Crafter®.Graphics
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Copyright (C) 2026 Catcrafts®
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catcrafts.net
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*/
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// WebGPU buffer wrapper — DOM-mode parallel to VulkanBuffer<T, Mapped>.
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// Holds a JS-side GPUBuffer handle + (when Mapped) a wasm-memory staging
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// array. `.value` points to the staging memory; the user writes into it
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// directly, and `.Flush(cmd)` copies to the GPU via queue.writeBuffer.
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export module Crafter.Graphics:WebGPUBuffer;
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#ifdef CRAFTER_GRAPHICS_WINDOW_DOM
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import std;
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import :WebGPU;
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export namespace Crafter {
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class WebGPUBufferBase {
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public:
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WebGPUBufferRef handle = 0;
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std::uint32_t size = 0; // bytes
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};
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template<typename T>
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class WebGPUBufferMapped {
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public:
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T* value = nullptr;
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};
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class WebGPUBufferMappedEmpty {};
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template<typename T, bool Mapped>
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using WebGPUBufferMappedConditional =
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std::conditional_t<Mapped, WebGPUBufferMapped<T>, WebGPUBufferMappedEmpty>;
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template<typename T, bool Mapped>
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class WebGPUBuffer : public WebGPUBufferBase, public WebGPUBufferMappedConditional<T, Mapped> {
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public:
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WebGPUBuffer() = default;
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WebGPUBuffer(const WebGPUBuffer&) = delete;
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WebGPUBuffer& operator=(const WebGPUBuffer&) = delete;
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WebGPUBuffer(WebGPUBuffer&& other) noexcept {
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handle = other.handle;
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size = other.size;
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other.handle = 0;
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if constexpr (Mapped) {
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this->value = other.value;
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other.value = nullptr;
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}
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}
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void Create(std::uint32_t count) {
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size = static_cast<std::uint32_t>(count * sizeof(T));
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handle = WebGPU::wgpuCreateBuffer(static_cast<std::int32_t>(size));
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if constexpr (Mapped) {
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this->value = new T[count]();
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}
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}
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void Clear() {
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if (handle != 0) {
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WebGPU::wgpuDestroyBuffer(handle);
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handle = 0;
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}
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if constexpr (Mapped) {
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if (this->value) { delete[] this->value; this->value = nullptr; }
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}
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}
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void Resize(std::uint32_t count) {
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if (handle != 0) Clear();
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Create(count);
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}
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void Flush(WebGPUCommandEncoderRef /*cmd*/) requires(Mapped) {
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WebGPU::wgpuWriteBuffer(handle, this->value, static_cast<std::int32_t>(size));
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}
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void FlushDevice() requires(Mapped) {
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WebGPU::wgpuWriteBuffer(handle, this->value, static_cast<std::int32_t>(size));
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}
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~WebGPUBuffer() { Clear(); }
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};
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}
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#endif // CRAFTER_GRAPHICS_WINDOW_DOM
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