public void OnWindowRender(double delta)
{
var size = _game.Window.Size;
GFX.Viewport(size);
GFX.Clear(Color.Indigo);
_program.Use();
Aspect <ICameraAspect> .ForEach(_game, camera => {
// Get the camera's transform matrix and invert it.
Matrix4x4.Invert(camera.Transform, out var cameraTransform);
// Create the camera's projection matrix, either ortho or perspective.
var cameraProjection = camera.Camera.IsOrthographic
? Matrix4x4.CreateOrthographic(size.Width, -size.Height,
camera.Camera.NearPlane, camera.Camera.FarPlane)
: Matrix4x4.CreatePerspectiveFieldOfView(
camera.Camera.FieldOfView *MathF.PI / 180, // Degrees => Radians
(float)size.Width / size.Height, // Aspect Ratio
camera.Camera.NearPlane, camera.Camera.FarPlane);
// Set the uniform to the combined transform and projection.
_cameraMatrixUniform.Set(cameraTransform *cameraProjection);
Aspect <IRenderableAspect> .ForEach(_game, renderable => {
_modelMatrixUniform.Set(renderable.Transform);
// If entity has Texture, bind it now.
if (renderable.Texture != null)
{
renderable.Texture.Value.Bind();
}
// If entity has SpriteIndex, only render two
// triangles out of the mesh specified by that index.
if (renderable.SpriteIndex != null)
{
renderable.Mesh.Draw(renderable.SpriteIndex.Value * 6, 6);
}
// Otherwise just render the entire mesh like usual.
renderable.Mesh.Draw();
// If entity has Texture, unbind it after it has been rendered.
if (renderable.Texture != null)
{
renderable.Texture.Value.Unbind();
}
});
});
VertexArray.Unbind();
}