From 50cdd344a3ed87c75a67739e2ffd34762e9b0895 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Tue, 12 Aug 2025 18:12:37 +0200
Subject: feat: start of a basic rendering backend

---
 src/core/application.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++++--
 src/core/application.h   | 13 ++++++++++++
 src/core/window.cpp      |  9 ++++++++
 3 files changed, 74 insertions(+), 2 deletions(-)

(limited to 'src/core')

diff --git a/src/core/application.cpp b/src/core/application.cpp
index d98ae4f..92bf211 100644
--- a/src/core/application.cpp
+++ b/src/core/application.cpp
@@ -1,5 +1,14 @@
 #include "application.h"
+
+#include "rendering/renderer.h"
+#include "rendering/vertex_array.h"
+#include "rendering/vertex_buffer.h"
+#include "rendering/index_buffer.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::on_init()     { }
-    void Application::on_shutdown() { }
+    void Application::on_init()     
+    { 
+        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_vertex_array = std::shared_ptr<VertexArray>(VertexArray::create());
+        m_vertex_buffer = std::shared_ptr<VertexBuffer>(VertexBuffer::create(vertices, sizeof(vertices)));
+        
+        VertexBufferLayout layout;
+        layout.push<float>(3);
+        layout.push<float>(4);
+        m_vertex_buffer->set_layout(layout);
+
+        m_vertex_array->add_vertex_buffer(m_vertex_buffer);
+
+        m_index_buffer = std::shared_ptr<IndexBuffer>(IndexBuffer::create(indices, 3));
+        m_vertex_array->set_index_buffer(m_index_buffer);
+
+        m_shader = std::shared_ptr<Shader>(Shader::create("assets/basic.glsl"));
+    }
+
+    void Application::on_shutdown() 
+    { 
+        Renderer::shutdown();
+    }
 
     void Application::on_update()
     {
@@ -82,5 +122,15 @@ namespace Donut
 
     void Application::on_render()
     {
+        Renderer::set_clear_color({ 0.1f, 0.1f, 0.1f, 1.0f });
+        Renderer::clear();
+
+        Renderer::begin_scene();
+
+        glm::mat4 view_projection = glm::ortho(-1.0f, 1.0f, -1.0f, 1.0f, -1.0f, 1.0f);
+        
+        Renderer::submit(m_shader, m_vertex_array, glm::mat4(1.0f));
+
+        Renderer::end_scene();
     }
 }
diff --git a/src/core/application.h b/src/core/application.h
index d88eab2..a860e1c 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_vertex_array;
+        std::shared_ptr<VertexBuffer> m_vertex_buffer;
+        std::shared_ptr<IndexBuffer> m_index_buffer;
+        std::shared_ptr<Shader> m_shader;
+
         static Application* s_instance;
     };
 }
diff --git a/src/core/window.cpp b/src/core/window.cpp
index ab5b977..77ef885 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 +43,14 @@ namespace Donut
         }
 
         glfwMakeContextCurrent(m_window);
+        
+        if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
+        {
+            std::cout << "Failed to initialize GLAD!" << std::endl;
+            glfwTerminate();
+            return;
+        }
+        
         glfwSetWindowUserPointer(m_window, this);
 
         glfwSetErrorCallback(glfw_error_callback);
-- 
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