using Engine.Graphics.Shader;
using OpenTK.Graphics.OpenGL;
using OpenTK.Mathematics;

namespace Engine.Graphics.Render.Mesh;

public class MeshRenderer : InstancedRenderer<Asset.Mesh.Mesh.Vertex, MeshInstanceVertex>
{
  public MeshRenderer(Renderer parRenderer, int parInstanceCount, Asset.Mesh.Mesh parMesh)
    : base(parRenderer, PrimitiveType.Triangles, parInstanceCount, parMesh.Indices.ToArray(),
      parMesh.Vertices.ToArray(),
      ProgramLoader.LoadFromSource(ShaderResource.Mesh))
  {
  }

  public void Commit(Matrix4 parModelMatrix)
  {
    if (_queuedInstanceCount >= _instanceCount)
    {
      throw new InvalidOperationException("Instance count exceeded");
    }

    _instanceVertices[_queuedInstanceCount]._modelMatrix = parModelMatrix;
    _queuedInstanceCount++;
  }
}