refractor

TheRepo/TheLabs/Mesh.cs

@@ -0,0 +1,132 @@
+namespace TheLabs;
+using LearnOpenTK.Common;
+using OpenTK.Graphics.OpenGL4;
+using OpenTK.Mathematics;
+using OpenTK.Windowing.Desktop;
+using StbImageSharp;
+
+public class Mesh : IDisposable
+{
+    private readonly int _vao;
+    private readonly int _vbo;
+    private readonly int _ebo;
+    private readonly int _vertexCount;
+    private readonly bool _useIndices;
+
+    // A flexible way to define vertex layout
+    // (Could be an enum or a struct)
+    public enum VertexLayout { PosColor, PosTex }
+
+    public Mesh(float[] vertices, uint[] indices, VertexLayout layout)
+    {
+        _vertexCount = indices.Length;
+        _useIndices = true;
+
+        _vao = GL.GenVertexArray();
+        GL.BindVertexArray(_vao);
+
+        _vbo = GL.GenBuffer();
+        GL.BindBuffer(BufferTarget.ArrayBuffer, _vbo);
+        GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.StaticDraw);
+
+        _ebo = GL.GenBuffer();
+        GL.BindBuffer(BufferTarget.ElementArrayBuffer, _ebo);
+        GL.BufferData(BufferTarget.ElementArrayBuffer, indices.Length * sizeof(uint), indices, BufferUsageHint.StaticDraw);
+
+        // --- Set up Vertex Attributes based on layout ---
+        if (layout == VertexLayout.PosColor)
+        {
+            // layout(location = 0) in shader: vec3 position
+            var stride = 7 * sizeof(float);
+            GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, 0);
+            GL.EnableVertexAttribArray(0);
+            
+            // layout(location = 1) in shader: vec4 color
+            GL.VertexAttribPointer(1, 4, VertexAttribPointerType.Float, false, stride, 3 * sizeof(float));
+            GL.EnableVertexAttribArray(1);
+        }
+        else if (layout == VertexLayout.PosTex)
+        {
+            // layout(location = 0) in shader: vec3 position
+            var stride = 5 * sizeof(float);
+            GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, 0);
+            GL.EnableVertexAttribArray(0);
+
+            // layout(location = 1) in shader: vec2 texCoord
+            GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, stride, 3 * sizeof(float));
+            GL.EnableVertexAttribArray(1);
+        }
+        // ... (you could add more layouts)
+        
+        GL.BindVertexArray(0);
+    }
+    
+    // Constructor for non-indexed drawing (like your Circle)
+    public Mesh(float[] vertices, VertexLayout layout)
+    {
+        // Calculate vertex count based on stride
+        if (layout == VertexLayout.PosColor)
+            _vertexCount = vertices.Length / 7;
+        else // PosTex
+            _vertexCount = vertices.Length / 5;
+
+        _useIndices = false;
+        _ebo = 0; // No EBO
+
+        _vao = GL.GenVertexArray();
+        GL.BindVertexArray(_vao);
+
+        _vbo = GL.GenBuffer();
+        GL.BindBuffer(BufferTarget.ArrayBuffer, _vbo);
+        GL.BufferData(BufferTarget.ArrayBuffer, vertices.Length * sizeof(float), vertices, BufferUsageHint.StaticDraw);
+
+        // --- Set up Vertex Attributes based on layout ---
+        if (layout == VertexLayout.PosColor)
+        {
+            // layout(location = 0) in shader: vec3 position
+            var stride = 7 * sizeof(float);
+            GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, 0);
+            GL.EnableVertexAttribArray(0);
+    
+            // layout(location = 1) in shader: vec4 color
+            GL.VertexAttribPointer(1, 4, VertexAttribPointerType.Float, false, stride, 3 * sizeof(float));
+            GL.EnableVertexAttribArray(1);
+        }
+        else if (layout == VertexLayout.PosTex)
+        {
+            // layout(location = 0) in shader: vec3 position
+            var stride = 5 * sizeof(float);
+            GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, stride, 0);
+            GL.EnableVertexAttribArray(0);
+
+            // layout(location = 1) in shader: vec2 texCoord
+            GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, stride, 3 * sizeof(float));
+            GL.EnableVertexAttribArray(1);
+        }
+    
+        GL.BindVertexArray(0);
+    }
+
+    // Draw the mesh. Notice it doesn't know about shaders or matrices!
+    public void Draw()
+    {
+        GL.BindVertexArray(_vao);
+        
+        if (_useIndices)
+        {
+            GL.DrawElements(PrimitiveType.Triangles, _vertexCount, DrawElementsType.UnsignedInt, 0);
+        }
+        else
+        {
+            // For your Circle (which used TriangleFan)
+            GL.DrawArrays(PrimitiveType.TriangleFan, 0, _vertexCount);
+        }
+    }
+
+    public void Dispose()
+    {
+        GL.DeleteBuffer(_vbo);
+        GL.DeleteBuffer(_ebo);
+        GL.DeleteVertexArray(_vao);
+    }
+}

TheRepo/TheLabs/MyExampleWindow.cs

@@ -16,12 +16,15 @@ namespace TheLabs
         // Negative Y coordinates move to the bottom, positive Y move to the top.
         // OpenGL only supports rendering in 3D, so to create a flat triangle, the Z coordinate will be kept as 0.
 
-        private Cube _cube;
-        private TexturedCube _texturedCube;
-        private Circle _circle;
-        private Cylinder _cylinder;
         private Shader _shader;
+        
+        // - Resources that only need to be created once
+        private Mesh _cubeMesh;
+        private Texture _cubeTexture;
         private float _rotation;
+        
+        // -- Scene Objects
+        private RenderObject _cubeObject;
 
         public MyExampleWindow(GameWindowSettings gameWindowSettings, NativeWindowSettings nativeWindowSettings)
             : base(gameWindowSettings, nativeWindowSettings)
@@ -33,20 +36,29 @@ namespace TheLabs
         { 
             // This is called when the window is created and is where we can set up OpenGL resources.
             base.OnLoad();
+            string shaderVertPath = "Shaders/shader.vert";
+            string texturePath = "Textures/placeholder.png";
+
+            if (!File.Exists(shaderVertPath))
+            {
+                throw new FileNotFoundException($"The shader file was not found at: {Path.GetFullPath(shaderVertPath)}");
+            }
+            if (!File.Exists(texturePath))
+            {
+                throw new FileNotFoundException($"The texture file was not found at: {Path.GetFullPath(texturePath)}");
+            }
             //GL.PolygonMode(MaterialFace.FrontAndBack, PolygonMode.Line);
             // Set The background color to a nice blue.
             GL.ClearColor(0.2f, 0.3f, 0.3f, 1.0f); 
-            // Enable depth buffering.
             GL.Enable(EnableCap.DepthTest);
-            GL.GenerateMipmap(GenerateMipmapTarget.Texture2D);
-            // Create and compile our shader program from the shader source files
             _shader = new Shader("Shaders/shader.vert", "Shaders/shader.frag");
-            // Create a cube
-            // Use the shader program. This is similar to "activating" the shader program.
-            _shader.Use();
-            GL.Uniform1(GL.GetUniformLocation(_shader.Handle, "uTexture"), 0);
 
+            _cubeMesh = ShapeFactory.CreateTexturedCube();
+            _cubeTexture = new Texture("Textures/placeholder.png");
             
+            _cubeObject = new RenderObject(_cubeMesh, _shader, _cubeTexture);
+            _cubeObject.Position = new Vector3(-0.75f, 0.0f, 0.0f);
+
         }
 
         // Now that initialization is done, let's create our render loop.
@@ -56,44 +68,33 @@ namespace TheLabs
             base.OnRenderFrame(e);
             // Clear the color buffer and the depth buffer
             GL.Clear(ClearBufferMask.DepthBufferBit | ClearBufferMask.ColorBufferBit);
-            // Create the model, view, and projection matrices
-            Matrix4 model = Matrix4.CreateRotationY(_rotation) * Matrix4.CreateRotationX(_rotation * 0.5f);
+            _cubeObject.Rotation = Quaternion.FromEulerAngles(_rotation * 0.5f, _rotation, 0); //
+            
+            // --- Set up Camera ---
             Matrix4 view = Matrix4.CreateTranslation(0.0f, 0.0f, -3.0f);
             Matrix4 projection = Matrix4.CreatePerspectiveFieldOfView(
                 MathHelper.DegreesToRadians(45f),
                 Size.X / (float)Size.Y,
                 0.1f,
                 100.0f
-            );           
+            );
+            
+            _cubeObject.Draw(view, projection);
             
-            // Draw the cube
-            //_cube = new Cube();
-            //_cube.Draw(_shader, view, projection, _rotation);
-            //_circle.Draw(_shader, view, projection, model);
-            //_cylinder.Draw(_shader, model, view, projection);
-            _texturedCube = new TexturedCube();
-            _texturedCube.Draw(_shader, view, projection, _rotation);
             SwapBuffers();
-            GL.GetError();
         }
 
         protected override void OnUpdateFrame(FrameEventArgs e)
         {
             base.OnUpdateFrame(e);
-
+            _rotation += (float)e.Time; 
             var input = KeyboardState;
 
             if (input.IsKeyDown(Keys.Escape))
             {
                 Close();
             }
-            if (input.IsKeyDown(Keys.R))
-            {
-                _rotation += 0.8f * (float)e.Time; // Update rotation only when the condition is met
-            } else if (input.IsKeyDown(Keys.T))
-            {
-                _rotation -= 0.8f * (float)e.Time; // Update rotation only when the condition is met
-            }
+            
         }
 
         protected override void OnResize(ResizeEventArgs e)

TheRepo/TheLabs/RenderObject.cs

@@ -0,0 +1,42 @@
+using LearnOpenTK.Common;
+using OpenTK.Graphics.OpenGL4;
+using OpenTK.Mathematics;
+
+namespace TheLabs;
+
+public class RenderObject
+{
+    public Mesh Mesh;
+    public Shader Shader;
+    public Texture Texture; 
+    
+    public Vector3 Position = Vector3.Zero;
+    public Quaternion Rotation = Quaternion.Identity;
+    public Vector3 Scale = Vector3.One;
+
+    public RenderObject(Mesh mesh, Shader shader, Texture texture)
+    {
+        Mesh = mesh;
+        Shader = shader;
+        Texture = texture;
+    }
+    
+    public void Draw(Matrix4 view, Matrix4 projection)
+    {
+        // 1. Activate Shader
+        Shader.Use();
+        Shader.SetInt("uTexture", 0);
+        // 2. Bind Texture
+        Texture.Use(); // Assumes you have a Texture class
+        
+        // 3. Calculate Model Matrix
+        Matrix4 model = Matrix4.CreateScale(Scale) * Matrix4.CreateFromQuaternion(Rotation) * Matrix4.CreateTranslation(Position);        
+        // 4. Set Uniforms
+        Shader.SetMatrix4("model", model);
+        Shader.SetMatrix4("view", view);
+        Shader.SetMatrix4("projection", projection);
+        
+        // 5. Tell the Mesh to draw itself
+        Mesh.Draw();
+    }
+}

TheRepo/TheLabs/ShapeFactory.cs

@@ -0,0 +1,118 @@
+namespace TheLabs;
+
+public static class ShapeFactory
+{
+    public static Mesh CreateTexturedCube()
+    {
+        float[] vertices = {
+            // Front face (z = +0.5)
+            -0.5f, -0.5f,  0.5f,  0f, 0f, // Bottom-left
+            0.5f, -0.5f,  0.5f,  1f, 0f, // Bottom-right
+            0.5f,  0.5f,  0.5f,  1f, 1f, // Top-right
+            -0.5f,  0.5f,  0.5f,  0f, 1f, // Top-left
+        
+            // Back face (z = -0.5)
+            -0.5f, -0.5f, -0.5f,  1f, 0f, // Bottom-left
+            0.5f, -0.5f, -0.5f,  0f, 0f, // Bottom-right
+            0.5f,  0.5f, -0.5f,  0f, 1f, // Top-right
+            -0.5f,  0.5f, -0.5f,  1f, 1f, // Top-left
+        
+            // Left face (x = -0.5)
+            -0.5f, -0.5f, -0.5f,  0f, 0f, // Bottom-left
+            -0.5f, -0.5f,  0.5f,  1f, 0f, // Bottom-right
+            -0.5f,  0.5f,  0.5f,  1f, 1f, // Top-right
+            -0.5f,  0.5f, -0.5f,  0f, 1f, // Top-left   
+            // Right face (x = +0.5)
+            0.5f, -0.5f, -0.5f,  1f, 0f, // Bottom-left
+            0.5f, -0.5f,  0.5f,  0f, 0f, // Bottom-right
+            0.5f,  0.5f,  0.5f,  0f, 1f, // Top-right
+            0.5f,  0.5f, -0.5f,  1f, 1f, // Top-left
+        
+            // Top face (y = +0.5)
+            -0.5f,  0.5f, -0.5f,  0f, 1f, // Bottom-left
+            0.5f,  0.5f, -0.5f,  1f, 1f, // Bottom-right
+            0.5f,  0.5f,  0.5f,  1f, 0f, // Top-right
+            -0.5f,  0.5f,  0.5f,  0f, 0f, // Top-left
+        
+            // Bottom face (y = -0.5)
+            -0.5f, -0.5f, -0.5f,  1f, 1f, // Bottom-left
+            0.5f, -0.5f, -0.5f,  0f, 1f, // Bottom-right
+            0.5f, -0.5f,  0.5f,  0f, 0f, // Top-right
+            -0.5f, -0.5f,  0.5f,  1f, 0f, // Top-left
+
+        };
+        
+        uint[] indices = {
+            // Front face
+            0, 1, 2,
+            0, 2, 3,
+            // Back face
+            4, 5, 6,
+            4, 6, 7,
+            // Left face
+            8, 9, 10,
+            8, 10, 11,
+            // Right face
+            12, 13, 14,
+            12, 14, 15,
+            // Top face
+            16, 17, 18,
+            16, 18, 19,
+            // Bottom face
+            20, 21, 22,
+            20, 22, 23
+        };
+        
+        return new Mesh(vertices, indices, Mesh.VertexLayout.PosTex);
+    }
+
+    public static Mesh CreateColorCube()
+    {
+        float[] vertices = {
+            // Front face (z = +0.5)
+            -0.5f, -0.5f,  0.5f,  1f, 0f, 0f, 1f, // Bottom-left
+            0.5f, -0.5f,  0.5f,  1f, 0f, 0f, 1f, // Bottom-right
+            0.5f,  0.5f,  0.5f,  0f, 0f, 0f, 1f, // Top-right
+            -0.5f,  0.5f,  0.5f,  1f, 0f, 0f, 1f, // Top-left
+
+            // Back face (z = -0.5)
+            -0.5f, -0.5f, -0.5f,  1f, 0f, 1f, 1f, // Bottom-left
+            0.5f, -0.5f, -0.5f,  0f, 1f, 1f, 1f, // Bottom-right
+            0.5f,  0.5f, -0.5f,  1f, 1f, 1f, 1f, // Top-right
+            -0.5f,  0.5f, -0.5f,  0.5f, 0.5f, 0.5f, 1f // Top-left
+        };
+        
+        uint[] indices = {
+            // Front face
+            0, 1, 2,
+            2, 3, 0,
+
+            // Back face
+            4, 5, 6,
+            6, 7, 4,
+
+            // Left face
+            4, 0, 3,
+            3, 7, 4,
+
+            // Right face
+            1, 5, 6,
+            6, 2, 1,
+
+            // Top face
+            3, 2, 6,
+            6, 7, 3,
+
+            // Bottom face
+            4, 5, 1,
+            1, 0, 4
+        };
+        
+        return new Mesh(vertices, indices, Mesh.VertexLayout.PosColor);
+    }
+    
+    // You'd also add CreateCircle, CreateCylinder, etc.
+    // Your Cylinder should be ONE mesh, not 3 draw calls.
+    // Generate the top, bottom, and side vertices into one
+    // big array and use one EBO for all of it.
+}

TheRepo/TheLabs/Texture.cs

@@ -0,0 +1,61 @@
+namespace TheLabs;
+
+using OpenTK.Graphics.OpenGL4;
+using StbImageSharp;
+using System.IO;
+
+public class Texture : IDisposable
+{
+    public readonly int Handle;
+
+    public Texture(string path)
+    {
+        // Generate the handle
+        Handle = GL.GenTexture();
+
+        // Bind the texture so we can configure it
+        GL.ActiveTexture(TextureUnit.Texture0);
+        GL.BindTexture(TextureTarget.Texture2D, Handle);
+
+        // --- Set texture parameters ---
+        // Repeat the texture if UVs go outside [0, 1]
+        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
+        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
+        
+        // Set filter for shrinking (mipmap) and stretching (linear)
+        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.LinearMipmapLinear);
+        GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
+
+        // --- Load and upload the image data ---
+        StbImage.stbi_set_flip_vertically_on_load(1);
+        
+        // Load the image from disk
+        using (var stream = File.OpenRead(path))
+        {
+            ImageResult image = ImageResult.FromStream(stream, ColorComponents.RedGreenBlueAlpha);
+            
+            // Upload data to the GPU
+            GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, 
+                image.Width, image.Height, 0, 
+                PixelFormat.Rgba, PixelType.UnsignedByte, image.Data);
+        }
+
+        // Generate mipmaps for better quality shrinking
+        GL.GenerateMipmap(GenerateMipmapTarget.Texture2D);
+
+        // Unbind the texture
+        GL.BindTexture(TextureTarget.Texture2D, 0);
+    }
+
+    // A simple method to bind the texture to a specific unit
+    public void Use(TextureUnit unit = TextureUnit.Texture0)
+    {
+        GL.ActiveTexture(unit);
+        GL.BindTexture(TextureTarget.Texture2D, Handle);
+    }
+
+    public void Dispose()
+    {
+        GL.DeleteTexture(Handle);
+    }
+}