Get swapchain texture and clear it red.

private/sdl_gpu_test/glsl_compiler.cpp

@@ -51,9 +51,9 @@ std::vector<std::uint32_t> compileGLSL(std::string_view source, const CompileGLS
     int sourceLength = static_cast<int>(source.size());
     shader->setStringsWithLengths(&sourcePtr, &sourceLength, 1);
     shader->setDebugInfo(true);
-    shader->setEnvInput(glslang::EShSourceGlsl, stage, glslang::EShClientVulkan, glslang::EShTargetVulkan_1_3);
-    shader->setEnvClient(glslang::EShClientVulkan, glslang::EShTargetVulkan_1_3);
-    shader->setEnvTarget(glslang::EShTargetLanguage::EshTargetSpv, glslang::EShTargetSpv_1_6);
+    shader->setEnvInput(glslang::EShSourceGlsl, stage, glslang::EShClientVulkan, glslang::EShTargetVulkan_1_0);
+    shader->setEnvClient(glslang::EShClientVulkan, glslang::EShTargetVulkan_1_0);
+    shader->setEnvTarget(glslang::EShTargetLanguage::EshTargetSpv, glslang::EShTargetSpv_1_0);
 
     DirStackFileIncluder includer;
     std::string preprocessedCode;
@@ -110,7 +110,7 @@ std::vector<std::uint32_t> compileGLSL(std::string_view source, const CompileGLS
         .optimizeSize = false,
         .disassemble = false,
         .validate = true,
-        .emitNonSemanticShaderDebugInfo = true,
+        .emitNonSemanticShaderDebugInfo = false, // requires SPV_KHR_non_semantic_info
         .emitNonSemanticShaderDebugSource = false, // maybe?
         .compileOnly = false
     };

private/sdl_gpu_test/glsl_compiler.hpp

@@ -4,6 +4,7 @@
 #if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_GLSL_COMPILER_HPP_INCLUDED)
 #define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_GLSL_COMPILER_HPP_INCLUDED 1
 
+#include <cstdint>
 #include <string_view>
 #include <vector>
 

private/sdl_gpu_test/main.cpp

@@ -56,7 +56,10 @@ int main(int, char**)
     });
 
     sdlpp::GPUDevice gpuDevice;
-    gpuDevice.create({.formatFlags{.spirv = true}});
+    gpuDevice.create({
+        .formatFlags{.spirv = true},
+        .debugMode = true
+    });
 
     gpuDevice.claimWindow(window);
 
@@ -96,6 +99,21 @@ int main(int, char**)
                 [](const auto&) {} // default handler
             }, *event);
         }
+
+        sdlpp::GPUCommandBuffer cmdBuffer = gpuDevice.acquireCommandBuffer();
+        Uint32 swapchainWidth = 0, swapchainHeight = 0;
+        sdlpp::GPUTexture swapchainTexture = cmdBuffer.acquireSwapchainTexture(window, swapchainWidth, swapchainHeight);
+        std::array colorTargets = {sdlpp::GPUColorTargetInfo{
+            .texture = swapchainTexture,
+            .clearColor = {.r = 1.f, .g = 0.f, .b = 0.f, .a = 1.f},
+            .loadOp = sdlpp::GPULoadOp::CLEAR,
+        }};
+        sdlpp::GPURenderPass renderPass = cmdBuffer.beginRenderPass({
+            .colorTargetInfos = colorTargets
+        });
+
+        renderPass.end();
+        cmdBuffer.submit();
     }
 
     return 0;

private/sdl_gpu_test/sdlpp/common.hpp

@@ -4,9 +4,10 @@
 #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 <optional>
+#include <span>
 #include <stdexcept>
 #include <utility>
-#include <span>
 #include <vector>
 
 #include <mijin/debug/assert.hpp>

private/sdl_gpu_test/sdlpp/gpu.hpp

@@ -214,6 +214,19 @@ enum class GPUShaderStage
     FRAGMENT = SDL_GPU_SHADERSTAGE_FRAGMENT
 };
 
+enum class GPULoadOp
+{
+    LOAD = SDL_GPU_LOADOP_LOAD,
+    CLEAR = SDL_GPU_LOADOP_CLEAR,
+    DONT_CARE = SDL_GPU_LOADOP_DONT_CARE
+};
+
+enum class GPUStoreOp
+{
+    STORE = SDL_GPU_STOREOP_STORE,
+    DONT_CARE = SDL_GPU_STOREOP_DONT_CARE
+};
+
 //
 // bitflags
 //
@@ -354,9 +367,158 @@ struct GPUGraphicsPipelineTargetInfo
     }
 };
 
+using FColor = SDL_FColor;
+
+struct GPUColorTargetInfo
+{
+    SDL_GPUTexture* texture = nullptr;
+    Uint32 mipLevel = 0;
+    Uint32 layerOrDepthPlane = 0;
+    FColor clearColor = {.r = 0, .g = 0, .b = 0, .a = 1};
+    GPULoadOp loadOp = GPULoadOp::LOAD;
+    GPUStoreOp storeOp = GPUStoreOp::STORE;
+    bool cycle = false;
+};
+static_assert(sizeof(GPUColorTargetInfo) == sizeof(SDL_GPUColorTargetInfo)
+              && alignof(GPUColorTargetInfo) == alignof(SDL_GPUColorTargetInfo));
+
+struct GPUDepthStencilTargetInfo
+{
+    SDL_GPUTexture* texture = nullptr;
+    float clearDepth = 0.f;
+    GPULoadOp loadOp = GPULoadOp::LOAD;
+    GPUStoreOp storeOp = GPUStoreOp::STORE;
+    GPULoadOp stencilLoadOp = GPULoadOp::LOAD;
+    GPUStoreOp stencilStoreOp = GPUStoreOp::STORE;
+    bool cycle = false;
+    Uint8 clearStencil;
+};
+static_assert(sizeof(GPUDepthStencilTargetInfo) == sizeof(SDL_GPUDepthStencilTargetInfo)
+              && alignof(GPUDepthStencilTargetInfo) == alignof(SDL_GPUDepthStencilTargetInfo));
+
 //
 // classes
 //
+
+class GPURenderPass : public Base<SDL_GPURenderPass, GPURenderPass>
+{
+public:
+    GPURenderPass() noexcept = default;
+    GPURenderPass(const GPURenderPass&) = delete;
+    GPURenderPass(GPURenderPass&& other) noexcept : Base(std::move(other)) {}
+
+    GPURenderPass& operator=(const GPURenderPass&) = delete;
+    GPURenderPass& operator=(GPURenderPass&& other) noexcept
+    {
+        Base::operator=(std::move(other));
+        return *this;
+    }
+    auto operator<=>(const GPURenderPass& other) const noexcept = default;
+
+    void end() noexcept
+    {
+        SDL_EndGPURenderPass(mHandle);
+        mHandle = nullptr;
+    }
+
+    void destroy() noexcept
+    {
+        MIJIN_ASSERT(mHandle == nullptr, "Renderpass has not been ended.");
+    }
+
+    friend class GPUCommandBuffer;
+};
+
+class GPUTexture : public Base<SDL_GPUTexture, GPUTexture>
+{
+private:
+    SDL_GPUDevice* mDevice = nullptr;
+public:
+    GPUTexture() noexcept = default;
+    GPUTexture(const GPUTexture&) = delete;
+    GPUTexture(GPUTexture&& other) noexcept : Base(std::move(other)) {}
+
+    GPUTexture& operator=(const GPUTexture&) = delete;
+    GPUTexture& operator=(GPUTexture&& other) noexcept
+    {
+        Base::operator=(std::move(other));
+        return *this;
+    }
+    auto operator<=>(const GPUTexture& other) const noexcept = default;
+
+    void destroy() noexcept
+    {
+        if (mHandle != nullptr)
+        {
+            // if this is not manually created (e.g. a swapchain image), device will be nullptr
+            if (mDevice != nullptr)
+            {
+                SDL_ReleaseGPUTexture(mDevice, mHandle);
+            }
+            mHandle = nullptr;
+            mDevice = nullptr;
+        }
+    }
+
+    friend class GPUCommandBuffer;
+};
+
+struct GPUBeginRenderPassArgs
+{
+    std::span<const GPUColorTargetInfo> colorTargetInfos;
+    std::optional<GPUDepthStencilTargetInfo> depthStencilTargetInfo;
+};
+
+class GPUCommandBuffer : public Base<SDL_GPUCommandBuffer, GPUCommandBuffer>
+{
+public:
+    GPUCommandBuffer() noexcept = default;
+    GPUCommandBuffer(const GPUCommandBuffer&) = delete;
+    GPUCommandBuffer(GPUCommandBuffer&& other) noexcept : Base(std::move(other)) {}
+
+    GPUCommandBuffer& operator=(const GPUCommandBuffer&) = delete;
+    GPUCommandBuffer& operator=(GPUCommandBuffer&& other) noexcept
+    {
+        Base::operator=(std::move(other));
+        return *this;
+    }
+    auto operator<=>(const GPUCommandBuffer& other) const noexcept = default;
+
+    void submit() noexcept
+    {
+        SDL_SubmitGPUCommandBuffer(mHandle);
+        mHandle = nullptr;
+    }
+
+    void destroy() noexcept
+    {
+        MIJIN_ASSERT(mHandle == nullptr, "Command buffer has not been submitted.");
+    }
+
+    [[nodiscard]]
+    GPURenderPass beginRenderPass(const GPUBeginRenderPassArgs& args) const noexcept
+    {
+        GPURenderPass renderPass;
+        renderPass.mHandle = SDL_BeginGPURenderPass(
+            /* command_buffer            = */ mHandle,
+            /* color_target_infos        = */ std::bit_cast<const SDL_GPUColorTargetInfo*>(args.colorTargetInfos.data()),
+            /* num_color_targets         = */ static_cast<Uint32>(args.colorTargetInfos.size()),
+            /* depth_stencil_target_info = */ args.depthStencilTargetInfo.has_value() ? std::bit_cast<const SDL_GPUDepthStencilTargetInfo*>(&*args.depthStencilTargetInfo) : nullptr
+        );
+        return renderPass;
+    }
+
+    [[nodiscard]]
+    GPUTexture acquireSwapchainTexture(SDL_Window* window, Uint32& outWidth, Uint32& outHeight) noexcept
+    {
+        GPUTexture texture;
+        texture.mHandle = SDL_AcquireGPUSwapchainTexture(mHandle, window, &outWidth, &outHeight);
+        return texture;
+    }
+
+    friend class GPUDevice;
+};
+
 struct GPUDeviceCreateArgs
 {
     GPUShaderFormatFlags formatFlags = {};
@@ -400,11 +562,19 @@ public:
 
     void claimWindow(SDL_Window* window) const
     {
-        if (!SDL_ClaimWindowForGPUDevice(*this, window))
+        if (!SDL_ClaimWindowForGPUDevice(mHandle, window))
         {
             throw SDLError();
         }
     }
+
+    [[nodiscard]]
+    GPUCommandBuffer acquireCommandBuffer() const noexcept
+    {
+        GPUCommandBuffer cmdBuffer;
+        cmdBuffer.mHandle = SDL_AcquireGPUCommandBuffer(mHandle);
+        return cmdBuffer;
+    }
 };
 
 struct GPUGraphicsPipelineCreateArgs