SceneRenderer (WIP).

private/sdl_gpu_test/7_3d_scene/app.cpp

@@ -3,10 +3,9 @@
 
 #include <glm/mat4x4.hpp>
 #include <glm/vec2.hpp>
-#include <glm/vec3.hpp>
 #include <glm/vec4.hpp>
-#include <glm/gtc/matrix_transform.hpp>
 
+#include "../scene/mesh.hpp"
 #include "../sdlpp/keyboard.hpp"
 #include "../util/bitmap.hpp"
 #include "../util/mesh.hpp"
@@ -18,12 +17,6 @@ namespace
 inline constexpr float Y_POS_MIN = -10.f;
 inline constexpr float Y_POS_MAX = 10.f;
 inline constexpr Uint16 AXIS_DEADZONE = 5000;
-
-struct VertexShaderParameters
-{
-    glm::mat4 worldToView;
-    glm::mat4 viewToClip;
-};
 }
 
 void ThreeDSceneApp::init(const AppInitArgs& args)
@@ -38,30 +31,11 @@ void ThreeDSceneApp::init(const AppInitArgs& args)
         .height = 720
     });
 
-    // create graphics pipeline
-    createMeshPipeline();
-
-    // create UI pipeline
+    // init UI renderer
     mUIRenderer.init(*this);
 
-    // load the mesh
-    const Mesh mesh = loadMesh(mFileSystem.getPath("meshes/cube.obj"));
-    mNumVertices = static_cast<Uint32>(mesh.vertices.size());
-
-    // create vertex buffer
-    mVertexBuffer.create(mDevice, {
-        .usage = {.vertex = true},
-        .size = static_cast<Uint32>(mesh.vertices.size() * sizeof(Vertex))
-    });
-    uploadVertexData(mVertexBuffer, std::span(mesh.vertices));
-
-    // create texture and sampler
-    sdlpp::GPUTextureCreateArgs textureArgs = {
-        .format = sdlpp::GPUTextureFormat::R8G8B8A8_UNORM_SRGB,
-        .usage = {.sampler = true}
-    };
-    mTexture = loadTexture("bitmaps/cube.png", textureArgs);
-    mSampler.create(mDevice, {});
+    // init scene renderer
+    mSceneRenderer.init(*this);
 
     // open gamepad
     const std::vector<SDL_JoystickID> gamepads = sdlpp::getGamepads();
@@ -84,6 +58,11 @@ void ThreeDSceneApp::init(const AppInitArgs& args)
         .posX = 100,
         .posY = 500
     });
+
+    // init the scene
+    mScene.init({.renderer = &mSceneRenderer});
+    mScene.getRootNode().emplaceChild<MeshNode>({.mesh = "meshes/cube.obj", .texture = "bitmaps/cube.png"});
+
     mButton->clicked.connect([&]()
     {
         mButton->setText("Thanks!");
@@ -116,39 +95,14 @@ void ThreeDSceneApp::update(const AppUpdateArgs& args)
         mLastSwapchainHeight = swapchainHeight;
     }
 
-    // render the 3D "scene"
-    const VertexShaderParameters vertexShaderParameters = {
-        .worldToView = glm::lookAt(glm::vec3(2.f, mYPos, 2.f), glm::vec3(0.f, 0.f, 0.f), glm::vec3(0.f, 1.f, 0.f))
-                * glm::rotate(glm::mat4(1.f), glm::radians(mRotation), glm::vec3(0.f, 1.f, 0.f)),
-        .viewToClip = glm::perspectiveFov(
-            /* fov    = */ glm::radians(90.f),
-            /* width  = */ static_cast<float>(swapchainWidth),
-            /* height = */ static_cast<float>(swapchainHeight),
-            /* zNear  = */ 0.1f,
-            /* zFar   = */ 100.f
-        )
-    };
-
-    std::array colorTargets = {sdlpp::GPUColorTargetInfo{
-        .texture = swapchainTexture,
-        .clearColor = {.r = 0.f, .g = 0.f, .b = 0.f, .a = 1.f},
-        .loadOp = sdlpp::GPULoadOp::CLEAR,
-    }};
-    sdlpp::GPURenderPass renderPass = cmdBuffer.beginRenderPass({
-        .colorTargetInfos = colorTargets,
-        .depthStencilTargetInfo = sdlpp::GPUDepthStencilTargetInfo{
-            .texture = mDepthBuffer,
-            .loadOp = sdlpp::GPULoadOp::CLEAR
-        }
+    // render the scene
+    mSceneRenderer.render({
+        .cmdBuffer = &cmdBuffer,
+        .targetTexture = &swapchainTexture,
+        .depthTexture = &mDepthBuffer,
+        .targetTextureWidth = swapchainWidth,
+        .targetTextureHeight = swapchainHeight
     });
-    static const glm::vec4 WHITE(1.f, 1.f, 1.f, 1.f);
-    cmdBuffer.pushFragmentUniformData(0, std::span(&WHITE, 1));
-    cmdBuffer.pushVertexUniformData(0, std::span(&vertexShaderParameters, 1));
-    renderPass.bindFragmentSampler({.texture = mTexture, .sampler = mSampler});
-    renderPass.bindGraphicsPipeline(mMeshPipeline);
-    renderPass.bindVertexBuffer({.buffer = mVertexBuffer});
-    renderPass.drawPrimitives({.numVertices = mNumVertices});
-    renderPass.end();
 
     // render the "UI"
     mUIRenderer.render({
@@ -192,72 +146,6 @@ void ThreeDSceneApp::handleMouseButtonEvent(const sdlpp::MouseButtonEvent& event
     mWidgetTree.notifyMouseButton(event);
 }
 
-
-void ThreeDSceneApp::createMeshPipeline()
-{
-    // create shaders
-    const sdlpp::GPUShader vertexShader = loadShader("shaders/glsl/textured_3dtriangles_from_buffer.vert.spv", {
-        .format = sdlpp::GPUShaderFormat::SPIRV,
-        .stage = sdlpp::GPUShaderStage::VERTEX,
-        .numUniformBuffers = 1
-    });
-    const sdlpp::GPUShader fragmentShader = loadShader("shaders/glsl/color_from_texture.frag.spv", {
-        .format = sdlpp::GPUShaderFormat::SPIRV,
-        .stage = sdlpp::GPUShaderStage::FRAGMENT,
-        .numSamplers = 1,
-        .numUniformBuffers = 1
-    });
-    std::array colorTargetsDescs = {
-        sdlpp::GPUColorTargetDescription{
-            .format = mDevice.getSwapchainTextureFormat(mWindow),
-            .blendState = {
-                .enableBlend = true,
-                .srcColorBlendfactor = sdlpp::GPUBlendFactor::SRC_ALPHA,
-                .dstColorBlendfactor = sdlpp::GPUBlendFactor::ONE_MINUS_SRC_ALPHA,
-                .colorBlendOp = sdlpp::GPUBlendOp::ADD,
-                .srcAlphaBlendfactor = sdlpp::GPUBlendFactor::ONE,
-                .dstAlphaBlendfactor = sdlpp::GPUBlendFactor::ZERO,
-            .alphaBlendOp = sdlpp::GPUBlendOp::ADD
-            }
-        }
-    };
-    std::array vertexBindings = {
-        sdlpp::GPUVertexBinding{
-            .index = 0,
-            .pitch = sizeof(Vertex)
-        }
-    };
-    std::array vertexAttributes = {
-        sdlpp::GPUVertexAttribute{
-            .location = 0,
-            .bindingIndex = 0,
-            .format = sdlpp::GPUVertexElementFormat::FLOAT3,
-            .offset = offsetof(Vertex, pos)
-        },
-        sdlpp::GPUVertexAttribute{
-            .location = 1,
-            .bindingIndex = 0,
-            .format = sdlpp::GPUVertexElementFormat::FLOAT2,
-            .offset = offsetof(Vertex, texcoord)
-        }
-    };
-    mMeshPipeline.create(mDevice, {
-        .vertexShader = vertexShader,
-        .fragmentShader = fragmentShader,
-        .vertexInputState = {
-            .vertexBindings = vertexBindings,
-            .vertexAttributes = vertexAttributes
-        },
-        .rasterizerState = {
-            .cullMode = sdlpp::GPUCullMode::BACK
-        },
-        .targetInfo = {
-            .colorTargetDescriptions = colorTargetsDescs,
-            .depthStencilFormat = sdlpp::GPUTextureFormat::D16_UNORM
-        }
-    });
-}
-
 void ThreeDSceneApp::processInput(const AppUpdateArgs& args)
 {
     const std::span<const SDL_bool> keystates = sdlpp::getKeyboardState();

private/sdl_gpu_test/7_3d_scene/app.hpp

@@ -9,6 +9,8 @@
 #include "../gui/label.hpp"
 #include "../gui/widget.hpp"
 #include "../gui/ui_renderer.hpp"
+#include "../scene/scene.hpp"
+#include "../scene/scene_renderer.hpp"
 #include "../sdlpp/gamepad.hpp"
 
 namespace sdl_gpu_test
@@ -16,20 +18,18 @@ namespace sdl_gpu_test
 class ThreeDSceneApp : public Application
 {
 private:
-    sdlpp::GPUBuffer mVertexBuffer;
     sdlpp::GPUTexture mDepthBuffer;
-    sdlpp::GPUGraphicsPipeline mMeshPipeline;
-    sdlpp::GPUTexture mTexture;
-    sdlpp::GPUSampler mSampler;
 
     UIRenderer mUIRenderer;
     WidgetTree mWidgetTree;
 
-    Label* mLabel;
-    Button* mButton;
+    SceneRenderer mSceneRenderer;
+    Scene mScene;
+
+    Label* mLabel = nullptr;
+    Button* mButton = nullptr;
 
     sdlpp::Gamepad mGamepad;
-    Uint32 mNumVertices = 0;
     Uint32 mLastSwapchainWidth = 1280;
     Uint32 mLastSwapchainHeight = 720;
     float mRotation = 0.f;
@@ -41,7 +41,6 @@ public:
     void handleMouseMotionEvent(const sdlpp::MouseMotionEvent& event) override;
     void handleMouseButtonEvent(const sdlpp::MouseButtonEvent&) override;
 private:
-    void createMeshPipeline();
     void processInput(const AppUpdateArgs& args);
 };
 } // namespace sdl_gpu_test

private/sdl_gpu_test/SModule

@@ -9,6 +9,9 @@ src_files = Split("""
     gui/label.cpp
     gui/ui_renderer.cpp
     gui/widget.cpp
+    scene/mesh.cpp
+    scene/scene.cpp
+    scene/scene_renderer.cpp
     util/bitmap.cpp
     util/font_map.cpp
     util/mesh.cpp

private/sdl_gpu_test/scene/mesh.cpp

@@ -0,0 +1,62 @@
+
+#include "./mesh.hpp"
+
+namespace sdl_gpu_test
+{
+MeshNode::MeshNode(MeshNodeCreateArgs args) : mMeshPath(std::move(args.mesh)), mTexturePath(std::move(args.texture))
+{
+
+}
+
+void MeshNode::setMesh(std::string resourcePath)
+{
+    mMeshPath = std::move(resourcePath);
+
+    if (mScene != nullptr)
+    {
+        updateMesh();
+    }
+}
+
+void MeshNode::setTexture(std::string resourcePath)
+{
+    mTexturePath = std::move(resourcePath);
+
+    if (mScene != nullptr)
+    {
+        updateTexture();
+    }
+}
+
+void MeshNode::handleEnteredScene()
+{
+    SceneNode::handleEnteredScene();
+
+    updateMesh();
+    updateTexture();
+}
+
+void MeshNode::updateMesh()
+{
+    if (mMeshPath.empty())
+    {
+        mMesh = nullptr;
+    }
+    else
+    {
+        mMesh = mScene->getRenderer().getMesh(mMeshPath);
+    }
+}
+
+void MeshNode::updateTexture()
+{
+    if (mTexturePath.empty())
+    {
+        mTexture = nullptr;
+    }
+    else
+    {
+        mTexture = mScene->getRenderer().getTexture(mTexturePath);
+    }
+}
+}

private/sdl_gpu_test/scene/mesh.hpp

@@ -0,0 +1,41 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_MESH_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_MESH_HPP_INCLUDED 1
+
+#include "./scene.hpp"
+
+#include "../util/mesh.hpp"
+
+namespace sdl_gpu_test
+{
+struct MeshNodeCreateArgs
+{
+    std::string mesh;
+    std::string texture;
+};
+
+class MeshNode : public SceneNode
+{
+public:
+    using create_args_t = MeshNodeCreateArgs;
+private:
+    std::shared_ptr<SceneMesh> mMesh;
+    std::shared_ptr<SceneTexture> mTexture;
+    std::string mMeshPath;
+    std::string mTexturePath;
+public:
+    MeshNode(MeshNodeCreateArgs args);
+
+    void setMesh(std::string resourcePath);
+    void setTexture(std::string resourcePath);
+
+    void handleEnteredScene() override;
+private:
+    void updateMesh();
+    void updateTexture();
+};
+} // namespace sdl_gpu_test
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_MESH_HPP_INCLUDED)

private/sdl_gpu_test/scene/scene.cpp

@@ -0,0 +1,42 @@
+
+#include "./scene.hpp"
+
+namespace sdl_gpu_test
+{
+void SceneNode::handleEnteredScene()
+{
+    for (scene_node_ptr_t& child : mChildren)
+    {
+        child->enterScene(mScene, this);
+    }
+}
+
+SceneNode* SceneNode::addChild(scene_node_ptr_t&& node)
+{
+    mChildren.push_back(std::move(node));
+
+    if (mScene != nullptr)
+    {
+        mChildren.back()->enterScene(mScene, this);
+    }
+
+    return mChildren.back().get();
+}
+
+
+void SceneNode::enterScene(Scene* scene, SceneNode* parent)
+{
+    MIJIN_ASSERT(mScene == nullptr && mParent == nullptr, "SceneNode is already in a scene.");
+    MIJIN_ASSERT_FATAL(scene != nullptr, "Missing parameter: scene.");
+
+    mScene = scene;
+    mParent = parent;
+    handleEnteredScene();
+}
+
+void Scene::init(const SceneInitArgs& args)
+{
+    MIJIN_ASSERT_FATAL(args.renderer != nullptr, "Missing parameter: renderer.");
+    mRenderer = args.renderer;
+}
+}

private/sdl_gpu_test/scene/scene.hpp

@@ -0,0 +1,71 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_SCENE_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_SCENE_HPP_INCLUDED 1
+
+#include <memory>
+#include <vector>
+
+#include "./scene_renderer.hpp"
+#include "./transform3d.hpp"
+
+namespace sdl_gpu_test
+{
+using scene_node_ptr_t = std::unique_ptr<class SceneNode>;
+
+struct SceneNodeCreateArgs
+{
+
+};
+
+class SceneNode
+{
+public:
+    using create_args_t = SceneNodeCreateArgs;
+protected:
+    std::vector<scene_node_ptr_t> mChildren;
+    SceneNode* mParent = nullptr;
+    class Scene* mScene = nullptr;
+    Transform3D mTransform;
+public:
+    virtual ~SceneNode() noexcept = default;
+
+    virtual void handleEnteredScene();
+
+    SceneNode* addChild(scene_node_ptr_t&& node);
+
+    template<typename TNode>
+    TNode* emplaceChild(typename TNode::create_args_t args)
+    {
+        return static_cast<TNode*>(addChild(std::make_unique<TNode>(args)));
+    }
+private:
+    void enterScene(Scene* scene, SceneNode* parent);
+};
+
+struct SceneInitArgs
+{
+    SceneRenderer* renderer;
+};
+
+class Scene
+{
+private:
+    SceneNode mRootNode;
+    SceneRenderer* mRenderer = nullptr;
+public:
+    void init(const SceneInitArgs& args);
+
+    [[nodiscard]]
+    SceneNode& getRootNode() noexcept { return mRootNode; }
+
+    [[nodiscard]]
+    const SceneNode& getRootNode() const noexcept { return mRootNode; }
+
+    [[nodiscard]]
+    SceneRenderer& getRenderer() const noexcept { return *mRenderer; }
+};
+} // namespace sdl_gpu_test
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_SCENE_HPP_INCLUDED)

private/sdl_gpu_test/scene/scene_renderer.cpp

@@ -0,0 +1,184 @@
+
+#include "./scene_renderer.hpp"
+
+#include <glm/mat4x4.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "./mesh.hpp"
+#include "../util/bitmap.hpp"
+#include "../util/mesh.hpp"
+
+namespace sdl_gpu_test
+{
+namespace
+{
+    struct VertexShaderParameters
+    {
+        glm::mat4 worldToView;
+        glm::mat4 viewToClip;
+    };
+}
+void SceneRenderer::init(Application& application)
+{
+    mApplication = &application;
+
+    mSampler.create(mApplication->getDevice(), {});
+}
+
+std::shared_ptr<SceneMesh> SceneRenderer::getMesh(const std::string& resourcePath)
+{
+    auto it = mCachedMeshes.find(resourcePath);
+    if (it != mCachedMeshes.end())
+    {
+        if (std::shared_ptr<SceneMesh> result = it->second.lock(); result != nullptr)
+        {
+            return result;
+        }
+        mCachedMeshes.erase(it);
+    }
+
+    const Mesh mesh = loadMesh(mApplication->getFileSystem().getPath(resourcePath));
+    std::shared_ptr<SceneMesh> result = std::make_shared<SceneMesh>();
+    result->numVertices = mesh.vertices.size();
+    result->vertexBuffer.create(mApplication->getDevice(), {
+        .usage = {.vertex = true},
+        .size = static_cast<Uint32>(result->numVertices * sizeof(Vertex))
+    });
+    mApplication->uploadVertexData(result->vertexBuffer, std::span(mesh.vertices));
+    mCachedMeshes.emplace(resourcePath, result);
+    return result;
+}
+
+std::shared_ptr<SceneTexture> SceneRenderer::getTexture(const std::string& resourcePath)
+{
+    auto it = mCachedTextures.find(resourcePath);
+    if (it != mCachedTextures.end())
+    {
+        if (std::shared_ptr<SceneTexture> result = it->second.lock(); result != nullptr)
+        {
+            return result;
+        }
+        mCachedTextures.erase(it);
+    }
+
+    const Bitmap bitmap = loadBitmap(mApplication->getFileSystem().getPath(resourcePath));
+    std::shared_ptr<SceneTexture> result = std::make_shared<SceneTexture>();
+    result->texture.create(mApplication->getDevice(), {
+        .format = sdlpp::GPUTextureFormat::R8G8B8A8_UNORM_SRGB,
+        .usage = {.sampler = true}
+    });
+    mApplication->uploadTextureData(result->texture, bitmap);
+    mCachedTextures.emplace(resourcePath, result);
+    return result;
+}
+
+void SceneRenderer::render(const SceneRendererRenderArgs& args)
+{
+    // just temporary
+    const float mYPos = 1.5f;
+    const float mRotation = 0.f;
+
+    VertexShaderParameters vertexShaderParameters = {
+        .worldToView = glm::lookAt(glm::vec3(2.f, mYPos, 2.f), glm::vec3(0.f, 0.f, 0.f), glm::vec3(0.f, 1.f, 0.f))
+                * glm::rotate(glm::mat4(1.f), glm::radians(mRotation), glm::vec3(0.f, 1.f, 0.f)),
+        .viewToClip = glm::perspectiveFov(
+            /* fov    = */ glm::radians(90.f),
+            /* width  = */ static_cast<float>(args.targetTextureWidth),
+            /* height = */ static_cast<float>(args.targetTextureHeight),
+            /* zNear  = */ 0.1f,
+            /* zFar   = */ 100.f
+        )
+    };
+
+    std::array colorTargets = {sdlpp::GPUColorTargetInfo{
+        .texture = *args.targetTexture,
+        .clearColor = {.r = 0.f, .g = 0.f, .b = 0.f, .a = 1.f},
+        .loadOp = sdlpp::GPULoadOp::CLEAR,
+    }};
+    sdlpp::GPURenderPass renderPass = args.cmdBuffer->beginRenderPass({
+        .colorTargetInfos = colorTargets,
+        .depthStencilTargetInfo = sdlpp::GPUDepthStencilTargetInfo{
+            .texture = *args.depthTexture,
+            .loadOp = sdlpp::GPULoadOp::CLEAR
+        }
+    });
+    renderPass.bindGraphicsPipeline(mPipeline);
+
+    static const glm::vec4 WHITE(1.f, 1.f, 1.f, 1.f);
+
+    for (const RenderListEntry& entry : mRenderList)
+    {
+        args.cmdBuffer->pushFragmentUniformData(0, std::span(&WHITE, 1));
+        args.cmdBuffer->pushVertexUniformData(0, std::span<const VertexShaderParameters>(&vertexShaderParameters, 1));
+        renderPass.bindFragmentSampler({.texture = entry.texture->texture, .sampler = mSampler});
+        renderPass.bindVertexBuffer({.buffer = entry.mesh->vertexBuffer});
+        renderPass.drawPrimitives({.numVertices = static_cast<Uint32>(entry.mesh->numVertices)});
+    }
+    renderPass.end();
+}
+
+void SceneRenderer::createPipeline()
+{
+    // create shaders
+    const sdlpp::GPUShader vertexShader = mApplication->loadShader("shaders/glsl/textured_3dtriangles_from_buffer.vert.spv", {
+        .format = sdlpp::GPUShaderFormat::SPIRV,
+        .stage = sdlpp::GPUShaderStage::VERTEX,
+        .numUniformBuffers = 1
+    });
+    const sdlpp::GPUShader fragmentShader = mApplication->loadShader("shaders/glsl/color_from_texture.frag.spv", {
+        .format = sdlpp::GPUShaderFormat::SPIRV,
+        .stage = sdlpp::GPUShaderStage::FRAGMENT,
+        .numSamplers = 1,
+        .numUniformBuffers = 1
+    });
+    std::array colorTargetsDescs = {
+        sdlpp::GPUColorTargetDescription{
+            .format = mApplication->getDevice().getSwapchainTextureFormat(mApplication->getWindow()),
+            .blendState = {
+                .enableBlend = true,
+                .srcColorBlendfactor = sdlpp::GPUBlendFactor::SRC_ALPHA,
+                .dstColorBlendfactor = sdlpp::GPUBlendFactor::ONE_MINUS_SRC_ALPHA,
+                .colorBlendOp = sdlpp::GPUBlendOp::ADD,
+                .srcAlphaBlendfactor = sdlpp::GPUBlendFactor::ONE,
+                .dstAlphaBlendfactor = sdlpp::GPUBlendFactor::ZERO,
+            .alphaBlendOp = sdlpp::GPUBlendOp::ADD
+            }
+        }
+    };
+    std::array vertexBindings = {
+        sdlpp::GPUVertexBinding{
+            .index = 0,
+            .pitch = sizeof(Vertex)
+        }
+    };
+    std::array vertexAttributes = {
+        sdlpp::GPUVertexAttribute{
+            .location = 0,
+            .bindingIndex = 0,
+            .format = sdlpp::GPUVertexElementFormat::FLOAT3,
+            .offset = offsetof(Vertex, pos)
+        },
+        sdlpp::GPUVertexAttribute{
+            .location = 1,
+            .bindingIndex = 0,
+            .format = sdlpp::GPUVertexElementFormat::FLOAT2,
+            .offset = offsetof(Vertex, texcoord)
+        }
+    };
+    mPipeline.create(mApplication->getDevice(), {
+        .vertexShader = vertexShader,
+        .fragmentShader = fragmentShader,
+        .vertexInputState = {
+            .vertexBindings = vertexBindings,
+            .vertexAttributes = vertexAttributes
+        },
+        .rasterizerState = {
+            .cullMode = sdlpp::GPUCullMode::BACK
+        },
+        .targetInfo = {
+            .colorTargetDescriptions = colorTargetsDescs,
+            .depthStencilFormat = sdlpp::GPUTextureFormat::D16_UNORM
+        }
+    });
+}
+}

private/sdl_gpu_test/scene/scene_renderer.hpp

@@ -0,0 +1,72 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_SCENE_RENDERER_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_SCENE_RENDERER_HPP_INCLUDED 1
+
+#include <memory>
+#include <unordered_map>
+#include <vector>
+
+#include "./transform3d.hpp"
+#include "../application.hpp"
+#include "../sdlpp/gpu.hpp"
+
+namespace sdl_gpu_test
+{
+struct SceneMesh
+{
+    sdlpp::GPUBuffer vertexBuffer;
+    std::size_t numVertices;
+};
+
+struct SceneTexture
+{
+    sdlpp::GPUTexture texture;
+};
+
+struct SceneRendererRenderArgs
+{
+    const sdlpp::GPUCommandBuffer* cmdBuffer;
+    const sdlpp::GPUTexture* targetTexture;
+    const sdlpp::GPUTexture* depthTexture;
+    unsigned targetTextureWidth;
+    unsigned targetTextureHeight;
+};
+
+class SceneRenderer
+{
+public:
+    using mesh_idx_t = std::uint64_t;
+private:
+    struct RenderListEntry
+    {
+        std::shared_ptr<SceneMesh> mesh;
+        std::shared_ptr<SceneTexture> texture;
+        Transform3D transform;
+        mesh_idx_t meshIdx;
+    };
+
+    Application* mApplication = nullptr;
+    std::unordered_map<std::string, std::weak_ptr<SceneMesh>> mCachedMeshes;
+    std::unordered_map<std::string, std::weak_ptr<SceneTexture>> mCachedTextures;
+    std::vector<RenderListEntry> mRenderList;
+
+    sdlpp::GPUGraphicsPipeline mPipeline;
+    sdlpp::GPUSampler mSampler;
+public:
+    void init(Application& application);
+
+    [[nodiscard]]
+    std::shared_ptr<SceneMesh> getMesh(const std::string& resourcePath);
+
+    [[nodiscard]]
+    std::shared_ptr<SceneTexture> getTexture(const std::string& resourcePath);
+
+    void render(const SceneRendererRenderArgs& args);
+private:
+    void createPipeline();
+};
+} // namespace sdl_gpu_test
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_SCENE_RENDERER_HPP_INCLUDED)

private/sdl_gpu_test/scene/transform3d.hpp

@@ -0,0 +1,82 @@
+
+#pragma once
+
+#if !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_TRANSFORM3D_HPP_INCLUDED)
+#define SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_TRANSFORM3D_HPP_INCLUDED 1
+
+#define GLM_ENABLE_EXPERIMENTAL 1
+#include <glm/mat4x4.hpp>
+#include <glm/vec3.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtx/euler_angles.hpp>
+#include <glm/gtx/matrix_decompose.hpp>
+#undef GLM_ENABLE_EXPERIMENTAL
+
+namespace sdl_gpu_test
+{
+struct Transform3D
+{
+    glm::mat4 matrix = glm::mat4(1);
+
+    [[nodiscard]] Transform3D inverse() const
+    {
+        return Transform3D {
+            .matrix = glm::inverse(matrix)
+        };
+    }
+
+    [[nodiscard]] Transform3D apply(const Transform3D& other) const
+    {
+        return Transform3D{
+            .matrix = matrix * other.matrix
+        };
+    }
+
+    template<typename T>
+    [[nodiscard]] T apply(const T& value) const
+    {
+        return matrix * value;
+    }
+
+    [[nodiscard]] glm::vec3 apply(const glm::vec3 value) const
+    {
+        return glm::vec3(matrix * glm::vec4(value, 1.f));
+    }
+
+    [[nodiscard]] glm::vec3 applyRotation(const glm::vec3 vec) const
+    {
+        // TODO: maybe find a better way to extract the rotation? this is really expensive
+        glm::vec3 scale;
+        glm::quat orientation;
+        glm::vec3 translation;
+        glm::vec3 skew;
+        glm::vec4 perspective;
+        glm::decompose(matrix, scale, orientation, translation, skew, perspective);
+        return orientation * vec;
+    }
+
+    [[nodiscard]] glm::vec3 getTranslation() const { return glm::vec3(matrix[3]); }
+
+    inline void setTranslation(const glm::vec3& translation);
+    void setLookAt(const glm::vec3& eye, const glm::vec3& target, const glm::vec3& up = glm::vec3(0.f, 1.f, 0.f)) {
+        matrix = glm::inverse(glm::lookAt(eye, target, up)); // glm lookAt() is for camera matrices, therefore basically inverted
+    }
+
+    [[nodiscard]] static inline Transform3D make(const glm::vec3& translation, const glm::quat& rotation = {}, const glm::vec3& scale = glm::vec3(1.f));
+    [[nodiscard]] static Transform3D makeLookAt(const glm::vec3& eye, const glm::vec3& target, const glm::vec3& up = glm::vec3(0.f, 1.f, 0.f)) {
+        return Transform3D{glm::inverse(glm::lookAt(eye, target, up))}; // glm lookAt() is for camera matrices, therefore basically inverted
+    }
+};
+
+inline Transform3D Transform3D::make(const glm::vec3& translation, const glm::quat& rotation, const glm::vec3& scale)
+{
+    return Transform3D{glm::translate(glm::mat4_cast(rotation) * glm::scale(glm::mat4(1), scale), translation)};
+}
+
+void Transform3D::setTranslation(const glm::vec3& translation)
+{
+    matrix[3] = glm::vec4(translation, 1.f);
+}
+} // namespace sdl_gpu_test
+
+#endif // !defined(SDL_GPU_TEST_PRIVATE_SDL_GPU_TEST_SCENE_TRANSFORM3D_HPP_INCLUDED)