From a2ec7dabd48a70ea69623406ddd0f8f97af403c8 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Tue, 12 Aug 2025 18:12:37 +0200
Subject: [add]: Start of a basic rendering backend

---
 src/Core/Application.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++++--
 src/Core/Application.h   | 13 ++++++++++++
 src/Core/Window.cpp      | 10 +++++++++
 3 files changed, 75 insertions(+), 2 deletions(-)

(limited to 'src/Core')

diff --git a/src/Core/Application.cpp b/src/Core/Application.cpp
index 9ca060c..98d1de7 100644
--- a/src/Core/Application.cpp
+++ b/src/Core/Application.cpp
@@ -1,5 +1,14 @@
 #include "Application.h"
+
+#include "Rendering/Renderer.h"
+#include "Rendering/VertexArray.h"
+#include "Rendering/VertexBuffer.h"
+#include "Rendering/IndexBuffer.h"
+#include "Rendering/Shader.h"
+
 #include <iostream>
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
 
 namespace Donut
 {
@@ -73,8 +82,39 @@ namespace Donut
         });
     }
 
-    void Application::OnInit()     { }
-    void Application::OnShutdown() { }
+    void Application::OnInit()     
+    { 
+        Renderer::Init();
+
+        float vertices[3 * 7] = 
+        {
+            -0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
+             0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
+             0.0f,  0.5f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f
+        };
+
+        uint32_t indices[3] = { 0, 1, 2 };
+
+        m_VertexArray = std::shared_ptr<VertexArray>(VertexArray::Create());
+        m_VertexBuffer = std::shared_ptr<VertexBuffer>(VertexBuffer::Create(vertices, sizeof(vertices)));
+        
+        VertexBufferLayout layout;
+        layout.Push<float>(3);
+        layout.Push<float>(4);
+        m_VertexBuffer->SetLayout(layout);
+
+        m_VertexArray->AddVertexBuffer(m_VertexBuffer);
+
+        m_IndexBuffer = std::shared_ptr<IndexBuffer>(IndexBuffer::Create(indices, 3));
+        m_VertexArray->SetIndexBuffer(m_IndexBuffer);
+
+        m_Shader = std::shared_ptr<Shader>(Shader::Create("assets/Basic.glsl"));
+    }
+
+    void Application::OnShutdown() 
+    { 
+        Renderer::Shutdown();
+    }
 
     void Application::OnUpdate()
     {
@@ -82,5 +122,15 @@ namespace Donut
 
     void Application::OnRender()
     {
+        Renderer::SetClearColor({ 0.1f, 0.1f, 0.1f, 1.0f });
+        Renderer::Clear();
+
+        Renderer::BeginScene();
+
+        glm::mat4 viewProjection = glm::ortho(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f);
+        
+        Renderer::Submit(m_Shader, m_VertexArray, glm::mat4(1.0f));
+
+        Renderer::EndScene();
     }
 }
diff --git a/src/Core/Application.h b/src/Core/Application.h
index fca4c42..b8c9d49 100644
--- a/src/Core/Application.h
+++ b/src/Core/Application.h
@@ -5,6 +5,14 @@
 #include <memory>
 #include <functional>
 
+namespace Donut
+{
+    class VertexArray;
+    class VertexBuffer;
+    class IndexBuffer;
+    class Shader;
+};
+
 namespace Donut
 {
     class Application
@@ -30,6 +38,11 @@ namespace Donut
         bool m_Running;
         bool m_Minimized;
 
+        std::shared_ptr<VertexArray> m_VertexArray;
+        std::shared_ptr<VertexBuffer> m_VertexBuffer;
+        std::shared_ptr<IndexBuffer> m_IndexBuffer;
+        std::shared_ptr<Shader> m_Shader;
+
         static Application* s_Instance;
     };
 }
\ No newline at end of file
diff --git a/src/Core/Window.cpp b/src/Core/Window.cpp
index 13025cf..440aeb1 100644
--- a/src/Core/Window.cpp
+++ b/src/Core/Window.cpp
@@ -1,6 +1,7 @@
 #include "Window.h"
 #include <cstdint>
 #include <iostream>
+#include <glad/glad.h>
 
 namespace Donut
 {
@@ -42,6 +43,15 @@ namespace Donut
         }
 
         glfwMakeContextCurrent(m_Window);
+        
+        // Initialize GLAD
+        if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
+        {
+            std::cout << "Failed to initialize GLAD!" << std::endl;
+            glfwTerminate();
+            return;
+        }
+        
         glfwSetWindowUserPointer(m_Window, this);
 
         glfwSetErrorCallback(GLFWErrorCallback);
-- 
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