feat: initialize all vars in shaders

CMakeLists.txt

@@ -40,8 +40,9 @@ add_executable(CodingGame
 
   src/window/window.cpp
 
+  src/components/batch.cpp
+
   src/renderer/debug.cpp
-  src/renderer/basics.cpp
   src/renderer/mesh.cpp
   src/renderer/shader.cpp
   src/renderer/texture.cpp

include/components/batch.h

@@ -0,0 +1,27 @@
+#ifndef COMPONENT_BATCH_H_
+#define COMPONENT_BATCH_H_
+
+#include "renderer/renderer.h"
+
+// requires mesh component
+struct batch {
+    friend class Renderer;
+public:
+    // requires transform component
+    struct item {
+        unsigned int batchId;
+    };
+
+    batch();
+
+    inline const unsigned int id() const { return m_id; }
+protected:
+    static unsigned int LastID;
+private:
+    unsigned int m_id;
+    unsigned int m_instance_vbo { 0 };
+private:
+    void prepare(glm::mat4 *instances, unsigned int count);
+};
+
+#endif // COMPONENT_BATCH_H_

include/components/mesh.h

@@ -5,7 +5,7 @@
 #include "renderer/wavefront.h"
 
 struct mesh {
-    std::unique_ptr<Object> object;
+    std::shared_ptr<Object> object;
 };
 
 #endif // COMPONENTS_MESH_H_

include/components/rotate.h

@@ -0,0 +1,6 @@
+#ifndef COMPONENT_ROTATE_H_
+#define COMPONENT_ROTATE_H_
+
+struct rotate {};
+
+#endif // COMPONENT_ROTATE_H_

include/renderer/basics.h

@@ -3,7 +3,10 @@
 
 #include <glm/glm.hpp>
 
+#include "renderer/mesh.h"
+
 class Vertex {
+    friend class Mesh;
 private:
     glm::vec3 m_position;
     glm::vec3 m_normal;

include/renderer/mesh.h

@@ -21,7 +21,7 @@ public:
 public:
     Mesh();
 public:
-    void Render();
+    void Render(unsigned int count);
 };
 
 #endif // MESH_H_

include/renderer/renderer.h

@@ -9,20 +9,23 @@
 // TODO: make static or singleton
 class Renderer {
 public:
-    Renderer();
+    Renderer(entt::registry& registry);
 
-    void Render(entt::registry& registry);
-    void GenerateShadowMaps(entt::registry& registry);
+    void Render();
+    void Init();
+    void GenerateShadowMaps();
 
     void OnWindowResized(int w, int h);
 private:
-    void ApplyLights(entt::registry& registry, Shader &shader);
-    void UpdateView(entt::registry& registry, Shader &shader);
-    void RenderScene(entt::registry& registry, Shader &shader);
+    void ApplyLights(Shader &shader);
+    void UpdateView();
+    void RenderScene(Shader &shader);
 private:
     Shader m_shader;
     Shader m_depthShader;
 
+    entt::registry& m_registry;
+
     // unsigned int m_depth_fbo;
     // unsigned int m_depthMap;
 

include/renderer/wavefront.h

@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "shader.h"
+#include "renderer/renderer.h"
 #include "renderer/material.h"
 #include "renderer/mesh.h"
 
@@ -15,6 +16,7 @@ enum ObjElement { OHASH, MTLLIB, USEMTL, O, V, VN, VT, F, OUNKNOWN };
 enum MtlElement { MHASH, NEWMTL, NS, KA, KS, KD, NI, D, ILLUM, MAP_KD, MAP_KA, MUNKNOWN };
 
 class Object {
+    friend class Renderer;
 private:
     static inline int NormalizeIndex(int idx, int baseCount);
 
@@ -34,8 +36,10 @@ private:
     Mesh& GetLastMesh();
     void CreateNewMesh(const std::string& materialName);
 public:
-    void Render(Shader& shader);
+    void Render(Shader& shader, unsigned int count);
     [[nodiscard]] inline const std::string Name() const { return m_name; }
+protected:
+    void EnableBatch(unsigned int instanceVBO);
 private:
     std::string m_name;
     std::vector<glm::vec3> m_vertices;

src/components/batch.cpp

@@ -0,0 +1,19 @@
+#include <GL/glew.h>
+
+#include "components/batch.h"
+
+unsigned int batch::LastID = 0;
+
+batch::batch() {
+    m_id = ++LastID;
+}
+
+void batch::prepare(glm::mat4 *instances, unsigned int count) {
+    if (m_instance_vbo == 0) {
+        glGenBuffers(1, &m_instance_vbo);
+    }
+    
+    glBindBuffer(GL_ARRAY_BUFFER, m_instance_vbo);
+        glBufferData(GL_ARRAY_BUFFER, sizeof(glm::mat4) * count, reinterpret_cast<void*>(instances), GL_DYNAMIC_DRAW);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+}

src/main.cpp

@@ -23,15 +23,17 @@
 #include "components/light.h"
 #include "components/camera.h"
 #include "components/mesh.h"
+#include "components/rotate.h"
+#include "components/batch.h"
 
 class Game : public IApplication {
 public:
-    Game() {
+    Game() : m_renderer(m_registry) {
         Object* lightObj = Object::LoadFile("./assets/sphere.obj");
         const auto lght = m_registry.create();
         m_registry.emplace<transform>(lght, glm::vec3(5.f, 5.f, 5.f), glm::vec3(0.f));
         m_registry.emplace<light>(lght, light::LightType::DIRECTIONAL, glm::vec3(1.f, 1.f, 1.f), 1.5f);
-        m_registry.emplace<mesh>(lght, std::unique_ptr<Object>(lightObj));
+        m_registry.emplace<mesh>(lght, std::shared_ptr<Object>(lightObj));
 
         const auto cameraEntity = m_registry.create();
         m_registry.emplace<transform>(cameraEntity, glm::vec3(0.f, 2.f, 2.f));
@@ -40,17 +42,36 @@ public:
         Object* targetObj = Object::LoadFile("./assets/wizard/wizard.obj");
         const auto targetEntity = m_registry.create();
         m_registry.emplace<transform>(targetEntity, glm::vec3(0.f, 0.0f, 0.f));
-        m_registry.emplace<mesh>(targetEntity, std::unique_ptr<Object>(targetObj));
+        m_registry.emplace<mesh>(targetEntity, std::shared_ptr<Object>(targetObj));
 
-        Object* cubeObj = Object::LoadFile("./assets/grass_block/grass_block.obj");
+        Object* grass = Object::LoadFile("./assets/grass_block/grass_block.obj");
         const auto cubeEntity = m_registry.create();
         m_registry.emplace<transform>(cubeEntity, glm::vec3(-1.5f, 0.4f, 0.f));
-        m_registry.emplace<mesh>(cubeEntity, std::unique_ptr<Object>(cubeObj));
+        m_registry.emplace<mesh>(cubeEntity, std::shared_ptr<Object>(grass));
+
+        // Cube template (use shared object to avoid reloading 1000 times)
+        std::shared_ptr<Object> cubeObj = std::shared_ptr<Object>(Object::LoadFile("./assets/grass_block/grass_block.obj"));
+        const auto batchEntt = m_registry.create();
+        m_registry.emplace<batch>(batchEntt);
+        m_registry.emplace<mesh>(batchEntt, cubeObj);
+        auto cubeBatch = m_registry.get<batch>(batchEntt);
+        // Generate 1000 random cubes
+        for (int i = 0; i < 1000; ++i) {
+            const auto cubeEntity = m_registry.create();
+
+            float x = static_cast<float>(rand()) / RAND_MAX * 200.f - 100.f; // range [-100, 100]
+            float y = static_cast<float>(rand()) / RAND_MAX * 10.f;          // range [0, 10]
+            float z = static_cast<float>(rand()) / RAND_MAX * 200.f - 100.f; // range [-100, 100]
+
+            m_registry.emplace<transform>(cubeEntity, glm::vec3(x, y, z));
+            m_registry.emplace<rotate>(cubeEntity);
+            m_registry.emplace<batch::item>(cubeEntity, cubeBatch.id());
+        }
 
         Object* floorObj = Object::LoadFile("./assets/plane.obj");
         const auto floorEntt = m_registry.create();
         m_registry.emplace<transform>(floorEntt, glm::vec3(0.f));
-        m_registry.emplace<mesh>(floorEntt, std::unique_ptr<Object>(floorObj));
+        m_registry.emplace<mesh>(floorEntt, std::shared_ptr<Object>(floorObj));
     }
     ~Game() override {}
 
@@ -69,7 +90,8 @@ public:
         m_startTicks = SDL_GetTicks();
         m_frameCount = 0;
 
-        m_renderer.GenerateShadowMaps(m_registry);
+        m_renderer.Init();
+        m_renderer.GenerateShadowMaps();
     }
 
     void OnWindowResized(const WindowResized& event) override {
@@ -165,17 +187,17 @@ public:
             }
         }
 
-        // auto rotateEntts = m_registry.view<transform, const mesh>();
-        // for (auto [entity, transform, mesh] : rotateEntts.each()) {
-        //     // auto targetTransform = rotateEntts.get<transform>(entity);
-        //     if (!m_registry.all_of<light>(entity)) {
-        //         transform.rotation.y = m_angle;
-        //     }
-        // }
+        auto rotateEntts = m_registry.view<transform, rotate>();
+        for (auto [entity, t] : rotateEntts.each()) {
+            // auto targetTransform = rotateEntts.get<transform>(entity);
+            if (!m_registry.all_of<light>(entity)) {
+                t.rotation.y = m_angle;
+            }
+        }
     }
 
     void OnRender() override {
-        m_renderer.Render(m_registry);
+        m_renderer.Render();
 
         m_frameCount++;
         m_currentTicks = SDL_GetTicks();

src/renderer/basics.cpp

@@ -1,15 +0,0 @@
-#include <GL/glew.h>
-
-#include "renderer/basics.h"
-
-void Vertex::DefineAttrib()
-{
-    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_position)));
-    glEnableVertexAttribArray(0);
-
-    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_normal)));
-    glEnableVertexAttribArray(1);
-    
-    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_texCoord)));
-    glEnableVertexAttribArray(2);
-}

src/renderer/debug.cpp

@@ -10,6 +10,43 @@ void MessageCallback(GLenum source,
                      const GLchar* message,
                      const void* userParam)
 {
+    if(id == 131169 || id == 131185 || id == 131218 || id == 131204) return; 
+
+    std::cout << "---------------" << std::endl;
+    std::cout << "Debug message (" << id << "): " <<  message << std::endl;
+
+    switch (source)
+    {
+        case GL_DEBUG_SOURCE_API:             std::cout << "Source: API"; break;
+        case GL_DEBUG_SOURCE_WINDOW_SYSTEM:   std::cout << "Source: Window System"; break;
+        case GL_DEBUG_SOURCE_SHADER_COMPILER: std::cout << "Source: Shader Compiler"; break;
+        case GL_DEBUG_SOURCE_THIRD_PARTY:     std::cout << "Source: Third Party"; break;
+        case GL_DEBUG_SOURCE_APPLICATION:     std::cout << "Source: Application"; break;
+        case GL_DEBUG_SOURCE_OTHER:           std::cout << "Source: Other"; break;
+    } std::cout << std::endl;
+
+    switch (type)
+    {
+        case GL_DEBUG_TYPE_ERROR:               std::cout << "Type: Error"; break;
+        case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: std::cout << "Type: Deprecated Behaviour"; break;
+        case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:  std::cout << "Type: Undefined Behaviour"; break; 
+        case GL_DEBUG_TYPE_PORTABILITY:         std::cout << "Type: Portability"; break;
+        case GL_DEBUG_TYPE_PERFORMANCE:         std::cout << "Type: Performance"; break;
+        case GL_DEBUG_TYPE_MARKER:              std::cout << "Type: Marker"; break;
+        case GL_DEBUG_TYPE_PUSH_GROUP:          std::cout << "Type: Push Group"; break;
+        case GL_DEBUG_TYPE_POP_GROUP:           std::cout << "Type: Pop Group"; break;
+        case GL_DEBUG_TYPE_OTHER:               std::cout << "Type: Other"; break;
+    } std::cout << std::endl;
+    
+    switch (severity)
+    {
+        case GL_DEBUG_SEVERITY_HIGH:         std::cout << "Severity: high"; break;
+        case GL_DEBUG_SEVERITY_MEDIUM:       std::cout << "Severity: medium"; break;
+        case GL_DEBUG_SEVERITY_LOW:          std::cout << "Severity: low"; break;
+        case GL_DEBUG_SEVERITY_NOTIFICATION: std::cout << "Severity: notification"; break;
+    } std::cout << std::endl;
+    std::cout << std::endl;
+    return;
     (void) source;
     (void) id;
     (void) length;

src/renderer/mesh.cpp

@@ -1,3 +1,5 @@
+#include <cstddef>
+
 #include "renderer/mesh.h"
 
 Mesh::Mesh() {
@@ -13,13 +15,21 @@ Mesh::Mesh() {
 
     // VBO (vertex buffer)
     glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
-    glBufferData(GL_ARRAY_BUFFER, 0, nullptr, GL_STATIC_DRAW);
+    glBufferData(GL_ARRAY_BUFFER, 0, nullptr, GL_DYNAMIC_DRAW);
 
     // EBO (index buffer)
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ebo);
-    glBufferData(GL_ELEMENT_ARRAY_BUFFER, 0, nullptr, GL_STATIC_DRAW);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, 0, nullptr, GL_DYNAMIC_DRAW);
 
-    Vertex::DefineAttrib();
+    // attributes
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_position)));
+    glEnableVertexAttribArray(0);
+
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_normal)));
+    glEnableVertexAttribArray(1);
+    
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const void*>(offsetof(Vertex, m_texCoord)));
+    glEnableVertexAttribArray(2);
 
     glBindBuffer(GL_ARRAY_BUFFER, 0);
     glBindVertexArray(0);
@@ -29,18 +39,22 @@ void Mesh::Upload() const {
     glBindVertexArray(m_vao);
 
     glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
-    glBufferData(GL_ARRAY_BUFFER, m_vertexBuffer.size() * sizeof(Vertex), m_vertexBuffer.data(), GL_STATIC_DRAW);
+    glBufferData(GL_ARRAY_BUFFER, m_vertexBuffer.size() * sizeof(Vertex), m_vertexBuffer.data(), GL_DYNAMIC_DRAW);
 
     // Upload indices
     glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ebo);
-    glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer.size() * sizeof(unsigned int), m_indexBuffer.data(), GL_STATIC_DRAW);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, m_indexBuffer.size() * sizeof(unsigned int), m_indexBuffer.data(), GL_DYNAMIC_DRAW);
 
     glBindVertexArray(0);
 }
 
-void Mesh::Render()
+void Mesh::Render(unsigned int count)
 {
     Bind();
+    if (count > 1) {
+        glDrawElementsInstanced(GL_TRIANGLES, static_cast<GLsizei>(m_indexBuffer.size()), GL_UNSIGNED_INT, 0, count);
+    } else {
         glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(m_indexBuffer.size()), GL_UNSIGNED_INT, 0);
+    }
     Unbind();
 }

src/renderer/renderer.cpp

@@ -1,4 +1,5 @@
 #include <iostream>
+#include <cassert>
 #include <glm/glm.hpp>
 #include <glm/ext/matrix_clip_space.hpp>
 #ifdef WIN32
@@ -16,8 +17,9 @@
 #include "components/camera.h"
 #include "components/light.h"
 #include "components/mesh.h"
+#include "components/batch.h"
 
-Renderer::Renderer()
+Renderer::Renderer(entt::registry& registry) : m_registry(registry)
 {
     m_proj = glm::perspective(
         static_cast<float>(M_PI_2),
@@ -27,7 +29,7 @@ Renderer::Renderer()
     );
 
     m_shader.init(
-        FileManager::read("./src/shaders/simple.vs"),
+        FileManager::read("./src/shaders/main.vs"),
         FileManager::read("./src/shaders/pbr.fs")
     );
 
@@ -42,6 +44,18 @@ Renderer::Renderer()
     m_shader.setMat4("u_projection", m_proj);
 }
 
+void Renderer::Init() {
+    // auto view = m_registry.view<batch, mesh>();
+    // for (auto [_, b, m] : m_registry.view<batch, mesh>().each()) {
+    //     unsigned int items = 0;
+    //     for (auto [entt, item] : m_registry.view<batch::item>().each()) {
+    //         if (item.batchId == b.id()) ++items;
+    //     }
+    //     b.prepare()
+    //     m.object->EnableBatch(b.m_instance_vbo);
+    // }
+}
+
 void Renderer::OnWindowResized(int w, int h) {
     m_proj = glm::perspective(
         static_cast<float>(M_PI_2),
@@ -49,18 +63,16 @@ void Renderer::OnWindowResized(int w, int h) {
         0.01f,
         100.0f
     );
-    m_shader.setMat4("u_projection", m_proj);
-    m_depthShader.setMat4("u_projection", m_proj);
 }
 
-void Renderer::ApplyLights(entt::registry& registry, Shader &shader) {
-    auto lights = registry.view<light>();
+void Renderer::ApplyLights(Shader &shader) {
+    auto lights = m_registry.view<light>();
     // TODO: Pass Lights Data to depth shader as well
     shader.setInt("lightsCount", static_cast<int>(lights.size()));
     size_t lightIndex = 0;
     for (auto entity : lights) {
-        auto &l = registry.get<light>(entity);
-        auto &transf = registry.get<transform>(entity);
+        auto &l = m_registry.get<light>(entity);
+        auto &transf = m_registry.get<transform>(entity);
         
         shader.setInt("lights[" + std::to_string(lightIndex) + "].type", static_cast<int>(l.type));
         shader.setVec3("lights[" + std::to_string(lightIndex) + "].position", transf.position);
@@ -75,32 +87,68 @@ void Renderer::ApplyLights(entt::registry& registry, Shader &shader) {
     }
 }
 
-void Renderer::UpdateView(entt::registry& registry, Shader &shader) {
-    auto cam = registry.view<transform, camera>().back();
-    auto camTransform = registry.get<transform>(cam);
+void Renderer::UpdateView() {
+    auto cam = m_registry.view<transform, camera>().back();
+    auto camTransform = m_registry.get<transform>(cam);
 
     m_view = glm::lookAt(
         camTransform.position,
         camTransform.position + camTransform.rotation,
         glm::vec3(0.f, 1.f, 0.f)
     );
-    shader.setMat4("u_view", m_view);
-    shader.setMat4("u_projection", m_proj);
+    m_shader.setMat4("u_view", m_view);
+    m_shader.setMat4("u_projection", m_proj);
 
-    shader.setVec3("viewPos", camTransform.position);
+    m_shader.setVec3("viewPos", camTransform.position);
 }
 
-void Renderer::RenderScene(entt::registry& registry, Shader &shader) {
-    auto view = registry.view<transform, mesh>();
+void Renderer::RenderScene(Shader &shader) {
+    std::unordered_map<unsigned int, std::vector<entt::entity>> batches;
 
-    for (auto [entity, transf, mesh] : view.each()) {
+    for (auto [entt, item] : m_registry.view<batch::item>().each()) {
+        if (batches.find(item.batchId) == batches.end())
+            batches.insert(std::make_pair(item.batchId, std::vector<entt::entity>()));
+
+        batches[item.batchId].push_back(entt);
+    }
+
+    shader.setBool("u_isInstanced", true);
+    shader.setBool("isLight", false);
+    shader.setVec3("currentLightColor", glm::vec3(0.f));
+    for (auto [entt, b, m] : m_registry.view<batch, mesh>().each()) {
+        // check if have items for batch render
+        if (batches.find(b.id()) == batches.end()) continue;
+
+        auto &batchItems = batches[b.id()];
+
+        std::vector<glm::mat4> models;
+        models.reserve(batchItems.size());
+
+        for (auto item : batchItems) {
+            auto &t = m_registry.get<transform>(item);
+            glm::mat4 rotation = glm::yawPitchRoll(t.rotation.y, t.rotation.x, t.rotation.z);
+            auto itemModel = glm::translate(glm::mat4(1.f), t.position) * rotation;
+            models.push_back(itemModel);
+        }
+
+        auto prevInstanceVBO = b.m_instance_vbo;
+        b.prepare(models.data(), models.size());
+        if (prevInstanceVBO <= 0) {
+            std::cout << "[DEBUG] enabling batch"<<std::endl;
+            m.object->EnableBatch(b.m_instance_vbo);
+        }
+        m.object->Render(shader, batchItems.size());
+    }
+    shader.setBool("u_isInstanced", false);
+
+    for (auto [entity, transf, mesh] : m_registry.view<transform, mesh>(entt::exclude<batch, batch::item>).each()) {
         if (mesh.object == nullptr) {
             std::cerr << "WARN: Entity doesn't have a mesh to render" << std::endl;
             return;
         }
 
-        if (registry.all_of<light>(entity)) {
-            auto &l = registry.get<light>(entity);
+        if (m_registry.all_of<light>(entity)) {
+            auto &l = m_registry.get<light>(entity);
             shader.setBool("isLight", true);
             shader.setVec3("currentLightColor", l.color);
         } else {
@@ -113,16 +161,16 @@ void Renderer::RenderScene(entt::registry& registry, Shader &shader) {
 
         shader.setMat4("u_model", m_model);
 
-        mesh.object->Render(shader);
+        mesh.object->Render(shader, 1);
     }
 }
 
-void Renderer::GenerateShadowMaps(entt::registry& registry) {
+void Renderer::GenerateShadowMaps() {
     const unsigned int SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
 
     m_depthShader.use();
 
-    auto lights = registry.view<light>();
+    auto lights = m_registry.view<light>();
 
     for (auto [lEntt, l] : lights.each()) {
         // TODO: support other light types when ready
@@ -150,12 +198,12 @@ void Renderer::GenerateShadowMaps(entt::registry& registry) {
     }
 }
 
-void Renderer::Render(entt::registry& registry) {
+void Renderer::Render() {
     const unsigned int SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
 
     m_depthShader.use();
 
-    auto lights = registry.view<light, transform>();
+    auto lights = m_registry.view<light, transform>();
 
     for (auto [lEntt, l, t] : lights.each()) {
         // TODO: support other light types when ready
@@ -177,7 +225,7 @@ void Renderer::Render(entt::registry& registry) {
         glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
         glBindFramebuffer(GL_FRAMEBUFFER, l.fbo);
             glClear(GL_DEPTH_BUFFER_BIT);
-            RenderScene(registry, m_depthShader);
+            RenderScene(m_depthShader);
         glBindFramebuffer(GL_FRAMEBUFFER, 0);
         glCullFace(GL_BACK);
     }
@@ -191,8 +239,8 @@ void Renderer::Render(entt::registry& registry) {
     
     m_shader.use();
 
-    ApplyLights(registry, m_shader);
-    UpdateView(registry, m_shader);
+    ApplyLights(m_shader);
+    UpdateView();
 
-    RenderScene(registry, m_shader);
+    RenderScene(m_shader);
 }

src/renderer/wavefront.cpp

@@ -392,6 +392,24 @@ Object* Object::LoadFile(const std::string& filename) {
     return obj;
 }
 
+void Object::EnableBatch(unsigned int instanceVBO) {
+    for (auto &mesh : m_meshes) {
+        mesh.Bind();
+
+        glBindBuffer(GL_ARRAY_BUFFER, instanceVBO);
+        std::size_t vec4Size = sizeof(glm::vec4);
+        for (int i = 0; i < 4; ++i) {
+            glEnableVertexAttribArray(3 + i); // use locations 3,4,5,6 for instance matrix
+            glVertexAttribPointer(3 + i, 4, GL_FLOAT, GL_FALSE,
+                                sizeof(glm::mat4), (void*)(i * vec4Size));
+            glVertexAttribDivisor(3 + i, 1); // IMPORTANT: one per instance, not per vertex
+        }
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        
+        mesh.Unbind();
+    }
+}
+
 
 // void Object::Render(Shader& shader)
 // {
@@ -420,7 +438,7 @@ Object* Object::LoadFile(const std::string& filename) {
 //     }
 // }
 
-void Object::Render(Shader& shader)
+void Object::Render(Shader& shader, unsigned int count)
 {
     for (auto &mesh : m_meshes)
     {
@@ -484,7 +502,7 @@ void Object::Render(Shader& shader)
         }
 
         // --- Render mesh ---
-        mesh.Render();
+        mesh.Render(count);
     }
 }
 

src/shaders/main.vs

@@ -4,6 +4,7 @@
 layout (location = 0) in vec3 position;  // Vertex position in local space (model space)
 layout (location = 1) in vec3 normal;    // vertex normal
 layout (location = 2) in vec2 texCoord;     // Vertex texture uv
+layout (location = 3) in mat4 instanceModel;     // Vertex texture uv
 
 // Output to fragment shader
 out vec3 vertexPos;
@@ -15,12 +16,15 @@ out vec4 fragPosLightSpace;
 uniform mat4 u_model;       // Model matrix: transforms from local space to world space
 uniform mat4 u_view;        // View matrix: transforms from world space to camera space (view space)
 uniform mat4 u_projection;  // Projection matrix: transforms from camera space to clip space
+uniform bool u_isInstanced;
 
 void main()
 {
-    vertexPos = vec3(u_model * vec4(position, 1.0));
+    mat4 model = u_isInstanced ? instanceModel : u_model;
 
-    mat3 normalMatrix = mat3(transpose(inverse(u_model)));
+    vertexPos = vec3(model * vec4(position, 1.0));
+
+    mat3 normalMatrix = mat3(transpose(inverse(model)));
     vertexNormal = normalMatrix * normal;
     // vertexNormal = normal;
 

src/shaders/pbr.fs

@@ -147,7 +147,7 @@ void main()
     for (int i = 0; i < lightsCount; i++)
     {
         // compute light vector L depending on type
-        vec3 L;
+        vec3 L = vec3(0);
         if (lights[i].type == 0) {
             // directional light: convention here is that lights[i].position stores the direction
             // *towards* the light (for example, for sun direction you may upload -sunDir).