prism/engine/gfx/webgpu/include/gfx_webgpu.hpp

#pragma once

#include <emscripten/html5_webgpu.h>

#include "gfx.hpp"

class GFXWebGPUPipeline;

class GFXWebGPU : public GFX {
public:
    bool initialize(const GFXCreateInfo& createInfo) override;

    ShaderLanguage accepted_shader_language() override;
    const char* get_name() override;

    // buffer
    GFXBuffer* create_buffer(void* data, GFXSize size, bool is_dynamic, GFXBufferUsage usage) override;
    void copy_buffer(GFXBuffer* buffer, void* data, GFXSize offset, GFXSize size) override;

    void* get_buffer_contents(GFXBuffer* buffer) override;
    void release_buffer_contents(GFXBuffer* buffer, void* handle) override;

    // texture
    GFXTexture* create_texture(const GFXTextureCreateInfo& info) override;
    void copy_texture(GFXTexture* texture, void* data, GFXSize size) override;
    void copy_texture(GFXTexture* from, GFXTexture* to) override;
    void copy_texture(GFXTexture* from, GFXBuffer* to) override;

    // sampler
    GFXSampler* create_sampler(const GFXSamplerCreateInfo& info) override;

    // framebuffer
    GFXFramebuffer* create_framebuffer(const GFXFramebufferCreateInfo& info) override;

    // render pass
    GFXRenderPass* create_render_pass(const GFXRenderPassCreateInfo& info) override;

    // pipeline
    GFXPipeline* create_graphics_pipeline(const GFXGraphicsPipelineCreateInfo& info) override;
    GFXPipeline* create_compute_pipeline(const GFXComputePipelineCreateInfo& info) override;

    GFXCommandBuffer* acquire_command_buffer(bool for_presentation_use) override;

    void submit(GFXCommandBuffer* command_buffer, platform::window_ptr window) override;

private:
    WGPUSwapChain create_swapchain();
    WGPUShaderModule create_shader(const uint32_t* code, uint32_t size, std::string_view label);

    uint64_t get_bind_group_hash(GFXWebGPUPipeline* pipeline);
    void cache_bind_group_state(GFXWebGPUPipeline* pipeline, WGPUBindGroupLayout group_layout);
    void reset_bind_state();

    WGPUDevice device;
    WGPUQueue queue;
    WGPUSwapChain swapchain;

    struct BoundShaderBuffer {
        GFXBuffer* buffer = nullptr;
        uint32_t size = 0, offset = 0;
    };

    std::array<BoundShaderBuffer, 25> boundShaderBuffers;
    std::array<GFXTexture*, 25> boundTextures;
    std::array<GFXSampler*, 25> boundSamplers;
};