ADD: Phong Lighting model

CMakeLists.txt

@@ -136,6 +136,8 @@ add_library(Engine STATIC
         engine/src/loader/models/MeshSection.h
         engine/src/loader/assets/AssetManager.cpp
         engine/src/loader/assets/AssetManager.h
+        engine/src/renderer/entities/PointLight.cpp
+        engine/src/renderer/entities/PointLight.h
 )
 target_include_directories(Engine PUBLIC engine/src)
 target_link_libraries(Engine PUBLIC OpenGL::GL glfw glad glm::glm imgui spdlog::spdlog tinyobjloader stb_image)

assets/shaders/basic.frag

@@ -1,12 +1,35 @@
 #version 460 core
 
 in vec2 pass_textureCoords;
+in vec3 surfaceNormal;
+in vec3 worldPos;
 
-uniform sampler2D textureSampler;
+uniform sampler2D diffuseSampler;
 uniform float opacity;
+uniform float shininess;
+
+uniform vec3 lightPosition;
+uniform vec3 lightColor;
+uniform vec3 cameraPosition;
+
 out vec4 fragColor;
 
+
 void main() {
-    vec4 texColor = texture(textureSampler, pass_textureCoords);
+    vec3 normal = normalize(surfaceNormal);
-    fragColor = vec4(texColor.rgb, texColor.a * opacity);
+    vec3 lightDir = normalize(lightPosition - worldPos);
+    vec3 camDir = normalize(cameraPosition - worldPos);
+    vec3 reflectDir = reflect(-lightDir, normal);
+
+    vec3 ambient = 0.1 * lightColor;
+
+    float diff = max(dot(normal, lightDir) , 0.0f);
+    vec3 diffuse = diff * lightColor;
+
+    float spec = pow(max(dot(camDir, reflectDir), 0.0), max(shininess, 1.0f));
+    vec3 specular = 0.5 * spec * lightColor;
+
+    vec4 texColor = texture(diffuseSampler, pass_textureCoords);
+    fragColor = vec4((ambient + diffuse + specular) * texColor.rgb, texColor.a * opacity);
+
 }

assets/shaders/basic.vert

@@ -9,11 +9,14 @@ uniform mat4 viewMatrix;
 
 out vec2 pass_textureCoords;
 out vec3 surfaceNormal;
+out vec3 worldPos;
 
 void main() {
     vec4 worldPosition = transformationMatrix * vec4(position, 1.0f);
     gl_Position = projectionMatrix * viewMatrix * worldPosition;
     pass_textureCoords = textureCoords;
 
-    surfaceNormal = (transformationMatrix * vec4(normal , 0.f)).xyz;
+    surfaceNormal = mat3(transpose(inverse(transformationMatrix))) * normal;
+    worldPos = worldPosition.xyz;
+
 }

engine/src/loader/models/ModelImporter.cpp

@@ -14,7 +14,7 @@
 engine::RawModelBundle engine::ModelImporter::importFromFile(const std::string& objPath, ModelSplitPolicy policy) {
     tinyobj::ObjReaderConfig config;
     config.mtl_search_path = std::filesystem::path(objPath).parent_path().string();
-    config.triangulate = true; // GL braucht Dreiecke, keine n-Ecke
+    config.triangulate = false; // GL braucht Dreiecke, keine n-Ecke
 
     tinyobj::ObjReader reader;
     if (!reader.ParseFromFile(objPath, config)) {

engine/src/renderer/MeshRenderSystem.cpp

@@ -9,6 +9,7 @@
 
 
 void engine::MeshRenderSystem::update(engine::EntityRegistry &registry, engine::RenderQueue &renderQueue) {
+    renderState.apply();
     auto transforms = registry.getPool<engine::TransformComponent>();
     auto meshes = registry.getPool<engine::MeshComponent>();
 

engine/src/renderer/MeshRenderSystem.h

@@ -5,12 +5,15 @@
 #ifndef COLORRACE_MESHRENDERSYSTEM_H
 #define COLORRACE_MESHRENDERSYSTEM_H
 #include "RenderSystem.h"
+#include "utils/openglWrapper/GLRenderState.h"
 
 
 namespace engine {
     class MeshRenderSystem : public engine::RenderSystem {
     public:
         void update(engine::EntityRegistry &registry, engine::RenderQueue &renderQueue) override;
+    private:
+        GLRenderState renderState;
     };
 
 }

engine/src/renderer/MeshRenderer.cpp

@@ -4,10 +4,14 @@
 
 #include "MeshRenderer.h"
 
-void engine::MeshRenderer::render(RenderQueue &queue, const Camera &camera) {
+#include "entities/PointLight.h"
+
+void engine::MeshRenderer::render(RenderQueue &queue, const Camera &camera, const PointLight& light) {
     m_shader->start();
     m_shader->loadViewMatrix(camera.getViewMatrix());
     m_shader->loadProjectionMatrix(camera.getProjectionMatrix());
+    m_shader->loadCameraPosition(camera.getPosition());
+    m_shader->loadLight(light.position, light.color);
 
     for (const auto&[mesh, transformationMatrix] : queue.getRenderCommands()) {
         m_shader->loadTransformationMatrix(transformationMatrix);

engine/src/renderer/MeshRenderer.h

@@ -6,6 +6,7 @@
 #define COLORRACE_MESHRENDERER_H
 #include "RenderQueue.h"
 #include "entities/Camera.h"
+#include "entities/PointLight.h"
 #include "shader/StaticShader.h"
 
 
@@ -13,7 +14,7 @@ namespace engine {
     class MeshRenderer {
     public:
         MeshRenderer() : m_shader(std::make_unique<StaticShader>()) {}
-        void render(RenderQueue& queue, const Camera& camera);
+        void render(RenderQueue& queue, const Camera& camera, const PointLight& light);
     private:
         std::unique_ptr<StaticShader> m_shader;
     };

engine/src/renderer/entities/PointLight.cpp

@@ -0,0 +1,5 @@
+//
+// Created by sebastian on 02.08.26.
+//
+
+#include "PointLight.h"

engine/src/renderer/entities/PointLight.h

@@ -0,0 +1,17 @@
+//
+// Created by sebastian on 02.08.26.
+//
+
+#ifndef COLORRACE_POINTLIGHT_H
+#define COLORRACE_POINTLIGHT_H
+#include "glm/vec3.hpp"
+
+
+namespace engine {
+   struct PointLight {
+      glm::vec3 position;
+      glm::vec3 color;
+   };
+}
+
+#endif //COLORRACE_POINTLIGHT_H

engine/src/renderer/shader/StaticShader.h

@@ -19,7 +19,11 @@ namespace engine {
                 std::ref(transformationMatrix),
                 std::ref(projectionMatrix),
                 std::ref(viewMatrix),
-                std::ref(opacity)
+                std::ref(opacity),
+                std::ref(lightPosition),
+                std::ref(lightColor),
+                std::ref(cameraPosition),
+                std::ref(shininess),
             });
         };
 
@@ -37,7 +41,16 @@ namespace engine {
 
         void loadMaterial(const Material& material) {
             //shininess.load(material.getShininess());
-            opacity.load(material.getOpacity());
+            //opacity.load(material.getOpacity());
+        }
+
+        void loadLight(const glm::vec3& position, const glm::vec3& color) {
+            lightPosition.load(position);
+            lightColor.load(color);
+        }
+
+        void loadCameraPosition(const glm::vec3& position) {
+            cameraPosition.load(position);
         }
     private:
         engine::UniformValue<glm::mat4> transformationMatrix{"transformationMatrix"};
@@ -45,6 +58,9 @@ namespace engine {
         engine::UniformValue<glm::mat4> viewMatrix{"viewMatrix"};
         engine::UniformValue<float> shininess{"shininess"};
         engine::UniformValue<float> opacity{"opacity"};
+        engine::UniformValue<glm::vec3> lightPosition{"lightPosition"};
+        engine::UniformValue<glm::vec3> lightColor{"lightColor"};
+        engine::UniformValue<glm::vec3> cameraPosition{"cameraPosition"};
     };
 }
 

game/src/GameLayer.cpp

@@ -26,6 +26,15 @@ void GameLayer::onDetach() {
 
 void GameLayer::onUpdate() {
     Layer::onUpdate();
+
+    auto transformComponentPool = m_entityRegistry.getPool<TransformComponent>();
+    for (const auto& [entity, transform] : transformComponentPool) {
+        m_entityRegistry.removeComponent<TransformComponent>(entity);
+
+        const auto updatedTransform = TransformComponent({0,0,0}, {0, transform.m_rotation.y + 1,0}, {1,1,1});
+        m_entityRegistry.addComponent<TransformComponent>(entity, updatedTransform);
+    }
+
 }
 
 void GameLayer::onRender() {
@@ -33,5 +42,5 @@ void GameLayer::onRender() {
 
     MeshRenderSystem meshRenderSystem;
     meshRenderSystem.update(m_entityRegistry, m_renderQueue);
-    m_renderer->render(m_renderQueue, *m_camera);
+    m_renderer->render(m_renderQueue, *m_camera, *m_pointLight);
 }

game/src/GameLayer.h

@@ -15,8 +15,8 @@
 
 class GameLayer: public engine::Layer {
 public:
-    GameLayer(engine::EntityRegistry& entityRegistry, std::shared_ptr<engine::Camera> cam)
+    GameLayer(engine::EntityRegistry& entityRegistry, std::shared_ptr<engine::Camera> cam, std::shared_ptr<engine::PointLight> light)
-        : m_entityRegistry(entityRegistry), m_camera(std::move(cam)), m_renderer(std::make_unique<engine::MeshRenderer>()) {}
+        : m_entityRegistry(entityRegistry), m_camera(std::move(cam)), m_renderer(std::make_unique<engine::MeshRenderer>()), m_pointLight(light) {}
     void onAttach() override;
     void onDetach() override;
     void onUpdate() override;
@@ -25,6 +25,7 @@ private:
     engine::GLRenderState m_renderState;
     engine::RenderQueue m_renderQueue;
     engine::EntityRegistry& m_entityRegistry;
+    std::shared_ptr<engine::PointLight> m_pointLight;
     std::shared_ptr<engine::Camera> m_camera;
     std::unique_ptr<engine::MeshRenderer> m_renderer;
 };

game/src/GameScene.cpp

@@ -8,10 +8,12 @@
 #include "ecs/standardComponents/MeshComponent.h"
 #include "ecs/standardComponents/TransformComponent.h"
 
-GameScene::GameScene() : Scene(), m_camera(std::make_unique<engine::Camera>()) {}
+GameScene::GameScene() : Scene(), m_camera(std::make_unique<engine::Camera>()) {
+    m_pointLight = std::make_shared<engine::PointLight>(glm::vec3(.0f, .0f, -5.0f), glm::vec3(1.0f, 1.0f, 1.0f));
+}
 
 void GameScene::onEnter() {
-    addLayer(std::make_unique<GameLayer>(entityRegistry, m_camera));
+    addLayer(std::make_unique<GameLayer>(entityRegistry, m_camera, m_pointLight));
 
     m_camera->setPosition({0.0f, 0.0f, 5.0f});
     m_camera->setYaw(0.0f);
@@ -38,4 +40,4 @@ std::vector<engine::AssetRequest> GameScene::getRequiredAssets() const {
     std::vector<engine::AssetRequest> requests;
     requests.emplace_back(engine::ModelRequest{"pawn", "assets/models/chess.obj", engine::ModelSplitPolicy::Combined});
     return requests;
-};
+}

game/src/GameScene.h

@@ -5,6 +5,7 @@
 #ifndef COLORRACE_GAMESCENE_H
 #define COLORRACE_GAMESCENE_H
 #include "layer/Scene.h"
+#include "renderer/entities/PointLight.h"
 
 
 class GameScene : public engine::Scene {
@@ -15,7 +16,7 @@ public:
     std::vector<engine::AssetRequest> getRequiredAssets() const override;
 private:
     std::shared_ptr<engine::Camera> m_camera;
-
+    std::shared_ptr<engine::PointLight> m_pointLight;
 };