551455-graphics-programming-2526-the-repo-Zyb3rWolfi/TheRepo/TheLabs/RenderObject.cs

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 Texture NormalMap;
    public Material Material;
    public Lighting Lighting;
    
    public Vector3 Position = Vector3.Zero;
    public Matrix4 Transform = Matrix4.Identity;
    public Quaternion Rotation = Quaternion.Identity;
    public Vector3 Scale = Vector3.One;
    public bool UseTexture = true;

    public RenderObject(Mesh mesh, Shader shader, Texture texture, Material material, Lighting lighting)
    {
        Mesh = mesh;
        Shader = shader;
        Texture = texture;
        Material = material;
        Lighting = lighting;
    }

    public RenderObject(Mesh mesh, Shader shader)
    {
        Mesh = mesh;
        Shader = shader;
    }
    
    public void Draw(Matrix4 view, Matrix4 projection, Lighting light)
    {
        
        Shader.Use();
        if (Texture != null && UseTexture)
        {
            Texture.Use(TextureUnit.Texture0);
            Shader.SetInt("uTexture", 0);
            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseTexture"), 1);
        }
        else
        {
            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseTexture"), 0);
        }

        if (NormalMap != null)
        {
            NormalMap.Use(TextureUnit.Texture1);
            Shader.SetInt("uNormalMap", 1);
            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseNormalMap"), 1);
        }
        else
        {
            GL.Uniform1(GL.GetUniformLocation(Shader.Handle, "uUseNormalMap"), 0);
        } 
        
        Material.Apply(Shader);
        light.Apply(Shader);

        Vector3 cameraPos = view.Inverted().ExtractTranslation();
        Shader.SetVector3("uViewPos", cameraPos);
        
        Matrix4 model = Matrix4.CreateScale(Scale) * Matrix4.CreateFromQuaternion(Rotation) * Matrix4.CreateTranslation(Position);        
        int modelLoc = GL.GetUniformLocation(Shader.Handle, "model");
        GL.UniformMatrix4(modelLoc, false, ref model); // Try TRUE here

        int viewLoc = GL.GetUniformLocation(Shader.Handle, "view");
        GL.UniformMatrix4(viewLoc, false, ref view); // Try TRUE here

        int projLoc = GL.GetUniformLocation(Shader.Handle, "projection");
        GL.UniformMatrix4(projLoc, false, ref projection); // Try TRUE here
        
        
        // 5. Tell the Mesh to draw itself
        Mesh.Draw();
    }
    
}