Some initial implementation.

external/scons-plus-plus

@@ -1 +1 @@
-Subproject commit bdf063a16c6bafd137f57eee780c83345887c46c
+Subproject commit 941f94a7b6ad9242ee1404663dfd855dcf203817

private/sdl_gpu_test/SModule

@@ -11,8 +11,11 @@ prog_app = env.UnityProgram(
     dependencies = {
         'mijin': {},
         'SDL': {
-            
+            'options': {
+                'ref': '76ce83801ade3ac922ad5ba6fddc49764c24206a'
             }
+        },
+        'spdlog': {}
     }
 )
 env.Default(prog_app)

private/sdl_gpu_test/main.cpp

@@ -1,5 +1,49 @@
 
+#include <mijin/util/scope_guard.hpp>
+#include <mijin/util/variant.hpp>
+#include <spdlog/spdlog.h>
+#include <SDL3/SDL.h>
+
+#include "./sdlpp/event.hpp"
+#include "./sdlpp/gpu.hpp"
+#include "./sdlpp/window.hpp"
+
 int main(int, char**)
 {
+    if (SDL_Init(0) != SDL_TRUE)
+    {
+        spdlog::error("Error initializing SDL.");
+        return 1;
+    }
+    MIJIN_SCOPE_EXIT {
+        SDL_Quit();
+    };
+
+    sdlpp::Window window;
+    window.create({
+        .flags = {.vulkan = true}
+    });
+
+    sdlpp::GPUDevice gpuDevice;
+    gpuDevice.create({.formatFlags{.spirv = true}});
+
+    gpuDevice.claimWindow(window);
+
+    const SDL_GPUTextureFormat texForm = SDL_GetGPUSwapchainTextureFormat(gpuDevice, window);
+    (void) texForm;
+
+    bool running = true;
+    while(running)
+    {
+        std::optional<sdlpp::sdl_event_t> event;
+        while ((event = sdlpp::pollEvent()).has_value())
+        {
+            std::visit(mijin::Visitor{
+                [&](const sdlpp::QuitEvent&) { running = false; },
+                [](const auto&) {} // default handler
+            }, *event);
+        }
+    }
+
     return 0;
 }

private/sdl_gpu_test/sdlpp/common.hpp

@@ -0,0 +1,54 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_COMMON_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_COMMON_HPP_INCLUDED 1
+
+#include <stdexcept>
+#include <utility>
+
+#include <mijin/debug/assert.hpp>
+#include <mijin/util/bitflags.hpp>
+#include <SDL3/SDL.h>
+
+namespace sdlpp
+{
+template<typename THandle, typename TConcrete>
+class Base
+{
+protected:
+    THandle* mHandle = nullptr;
+protected:
+    Base() noexcept = default;
+    explicit Base(THandle* handle) noexcept : mHandle(handle) {}
+    Base(Base&& other) noexcept : mHandle(std::exchange(other.mHandle, nullptr)) {}
+
+    Base& operator=(Base&& other) noexcept
+    {
+        if (this != &other)
+        {
+            static_cast<TConcrete&>(*this).destroy();
+            mHandle = std::exchange(other.mHandle, nullptr);
+        }
+        return *this;
+    }
+public:
+    Base(const Base&) = delete;
+    ~Base() noexcept
+    {
+        static_cast<TConcrete&>(*this).destroy();
+    }
+    Base& operator=(const Base&) = delete;
+    auto operator<=>(const Base& other) const noexcept = default;
+
+    operator THandle*() const noexcept { return mHandle; }
+};
+
+class SDLError : std::runtime_error
+{
+public:
+    SDLError() : std::runtime_error(SDL_GetError()) {}
+};
+} // namespace sdlpp
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_COMMON_HPP_INCLUDED)

private/sdl_gpu_test/sdlpp/event.hpp

@@ -0,0 +1,52 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_EVENT_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_EVENT_HPP_INCLUDED 1
+
+#include <optional>
+#include <variant>
+
+namespace sdlpp
+{
+struct Event
+{
+    Uint64 timestamp;
+
+    template<typename TBase>
+    explicit Event(const TBase& base) noexcept : timestamp(base.timestamp) {}
+};
+struct QuitEvent : Event
+{
+    explicit QuitEvent(const SDL_QuitEvent& base) noexcept : Event(base) {}
+};
+struct WindowEvent : Event
+{
+
+};
+
+using sdl_event_t = std::variant<
+    WindowEvent,
+    QuitEvent
+>;
+
+[[nodiscard]]
+std::optional<sdl_event_t> pollEvent() noexcept
+{
+    SDL_Event event;
+    while (SDL_PollEvent(&event))
+    {
+        switch (event.type)
+        {
+            case SDL_EVENT_QUIT:
+                return QuitEvent(event.quit);
+            default:
+                // can't translate this yet
+                break;
+        }
+    }
+    return std::nullopt;
+}
+} // namespace sdlpp
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_EVENT_HPP_INCLUDED)

private/sdl_gpu_test/sdlpp/gpu.hpp

@@ -0,0 +1,79 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_GPU_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_GPU_HPP_INCLUDED 1
+
+#include <SDL3/SDL_gpu.h>
+
+#include "./common.hpp"
+
+namespace sdlpp
+{
+struct GpuShaderFormat : mijin::BitFlags<GpuShaderFormat>
+{
+    bool private_ : 1 = false;
+    bool spirv : 1 = false;
+    bool dxbc : 1 = false;
+    bool dxil : 1 = false;
+    bool msl : 1 = false;
+    bool metallib : 1 = false;
+
+    constexpr operator SDL_GPUShaderFormat() const noexcept
+    {
+        return std::bit_cast<std::uint8_t>(*this);
+    }
+};
+
+struct GPUDeviceCreateArgs
+{
+    GpuShaderFormat formatFlags = {};
+    bool debugMode = false;
+    const char* name = nullptr;
+};
+
+class GPUDevice : public Base<SDL_GPUDevice, GPUDevice>
+{
+public:
+    GPUDevice() noexcept = default;
+    GPUDevice(const GPUDevice&) = delete;
+    GPUDevice(GPUDevice&& other) noexcept : Base(std::move(other)) {}
+
+    GPUDevice& operator=(const GPUDevice&) = delete;
+    GPUDevice& operator=(GPUDevice&& other) noexcept
+    {
+        Base::operator=(std::move(other));
+        return *this;
+    }
+    auto operator<=>(const GPUDevice& other) const noexcept = default;
+
+    void create(const GPUDeviceCreateArgs& args = {})
+    {
+        MIJIN_ASSERT(mHandle == nullptr, "GPUDevice has already been created.");
+        mHandle = SDL_CreateGPUDevice(args.formatFlags, args.debugMode, args.name);
+        if (mHandle == nullptr)
+        {
+            throw SDLError();
+        }
+    }
+
+    void destroy() noexcept
+    {
+        if (mHandle != nullptr)
+        {
+            SDL_DestroyGPUDevice(mHandle);
+            mHandle = nullptr;
+        }
+    }
+
+    void claimWindow(SDL_Window* window) const
+    {
+        if (!SDL_ClaimWindowForGPUDevice(*this, window))
+        {
+            throw SDLError();
+        }
+    }
+};
+} // namespace sdlpp
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_GPU_HPP_INCLUDED)

private/sdl_gpu_test/sdlpp/window.hpp

@@ -0,0 +1,96 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_WINDOW_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_WINDOW_HPP_INCLUDED 1
+
+#include "./common.hpp"
+
+namespace sdlpp
+{
+struct WindowFlags : mijin::BitFlags<WindowFlags>
+{
+    bool fullscreen : 1; //           0x0000000000000001    /**< window is in fullscreen mode */
+    bool opengl : 1; //               0x0000000000000002    /**< window usable with OpenGL context */
+    bool occluded : 1; //             0x0000000000000004    /**< window is occluded */
+    bool hidden : 1; //               0x0000000000000008)    /**< window is neither mapped onto the desktop nor shown in the taskbar/dock/window list; SDL_ShowWindow( is required for it to become visible */
+    bool borderless : 1; //           0x0000000000000010    /**< no window decoration */
+    bool resizable : 1; //            0x0000000000000020    /**< window can be resized */
+    bool minimized : 1; //            0x0000000000000040    /**< window is minimized */
+    bool maximized : 1; //            0x0000000000000080    /**< window is maximized */
+    bool mouse_grabbed : 1; //        0x0000000000000100    /**< window has grabbed mouse input */
+    bool input_focus : 1; //          0x0000000000000200    /**< window has input focus */
+    bool mouse_focus : 1; //          0x0000000000000400    /**< window has mouse focus */
+    bool external : 1; //             0x0000000000000800    /**< window not created by SDL */
+    bool modal : 1; //                0x0000000000001000    /**< window is modal */
+    bool high_pixel_density : 1; //   0x0000000000002000    /**< window uses high pixel density back buffer if possible */
+    bool mouse_capture : 1; //        0x0000000000004000)    /**< window has mouse captured (unrelated to MOUSE_GRABBED */
+    bool mouse_relative_mode : 1; //  0x0000000000008000    /**< window has relative mode enabled */
+    bool always_on_top : 1; //        0x0000000000010000    /**< window should always be above others */
+    bool utility : 1; //              0x0000000000020000    /**< window should be treated as a utility window, not showing in the task bar and window list */
+    bool tooltip : 1; //              0x0000000000040000    /**< window should be treated as a tooltip and does not get mouse or keyboard focus, requires a parent window */
+    bool popup_menu : 1; //           0x0000000000080000    /**< window should be treated as a popup menu, requires a parent window */
+    bool keyboard_grabbed : 1; //     0x0000000000100000    /**< window has grabbed keyboard input */
+    bool unused0 : 1; //              0x0000000000200000
+    bool unused1 : 1; //              0x0000000000400000
+    bool unused2 : 1; //              0x0000000000800000
+    bool unused3 : 1; //              0x0000000001000000
+    bool unused4 : 1; //              0x0000000002000000
+    bool unused5 : 1; //              0x0000000004000000
+    bool unused6 : 1; //              0x0000000008000000
+    bool vulkan : 1; //               0x0000000010000000    /**< window usable for Vulkan surface */
+    bool metal : 1; //                0x0000000020000000    /**< window usable for Metal view */
+    bool transparent : 1; //          0x0000000040000000    /**< window with transparent buffer */
+    bool notFocusable : 1;  //        0x0000000080000000    /**< window should not be focusable */
+
+    constexpr operator SDL_WindowFlags () const noexcept
+    {
+        return std::bit_cast<std::uint32_t>(*this);
+    }
+};
+
+struct WindowCreateArgs
+{
+    const char* title = "Window";
+    int width = 1280;
+    int height = 720;
+    WindowFlags flags = {};
+};
+
+class Window : public Base<SDL_Window, Window>
+{
+public:
+    Window() noexcept = default;
+    Window(const Window&) = delete;
+    Window(Window&& other) noexcept : Base(std::move(other)) {}
+
+    Window& operator=(const Window&) = delete;
+    Window& operator=(Window&& other) noexcept
+    {
+        Base::operator=(std::move(other));
+        return *this;
+    }
+    auto operator<=>(const Window& other) const noexcept = default;
+
+    void create(const WindowCreateArgs& args = {})
+    {
+        MIJIN_ASSERT(mHandle == nullptr, "Window has already been created.");
+        mHandle = SDL_CreateWindow(args.title, args.width, args.height, args.flags);
+        if (mHandle == nullptr)
+        {
+            throw SDLError();
+        }
+    }
+
+    void destroy() noexcept
+    {
+        if (mHandle != nullptr)
+        {
+            SDL_DestroyWindow(mHandle);
+            mHandle = nullptr;
+        }
+    }
+};
+} // namespace sdlpp
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SDLPP_WINDOW_HPP_INCLUDED)