protected override void OnRenderFrame(FrameEventArgs e)
{
GL.Enable(EnableCap.ClipDistance0);
GL.Enable(EnableCap.DepthTest);
GL.Disable(EnableCap.Blend);
// Shadow rendering
shadows.ShadowBuffer.Bind();
GL.Clear(ClearBufferMask.DepthBufferBit);
assets.RenderShadowMap(shadows, terrain);
terrain.RenderShadowMap(camera, shadows, ClipPlane.ClipBottom);
GL.ClipControl(ClipOrigin.LowerLeft, ClipDepthMode.ZeroToOne);
// Water refraction rendering
water.RefractionBuffer.Bind();
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
terrain.Render(camera, light, null, ClipPlane.ClipTop);
assets.Render(camera, light, null, terrain, ClipPlane.ClipTop);
// Water reflection rendering
camera.InvertY();
water.ReflectionBuffer.Bind();
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
terrain.Render(camera, light, null, ClipPlane.ClipBottom);
assets.Render(camera, light, null, terrain, ClipPlane.ClipBottom);
sky.Render(camera, light);
GL.Disable(EnableCap.ClipDistance0);
camera.Reset();
// Main rendering
multisampling.Bind();
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.PolygonMode(MaterialFace.FrontAndBack, State.PolygonMode);
sky.Render(camera, light);
terrain.Render(camera, light, shadows, ClipPlane.ClipBottom);
water.Render(camera, light, shadows);
GL.Enable(EnableCap.SampleShading);
assets.Render(camera, light, shadows, terrain, ClipPlane.ClipBottom);
GL.Disable(EnableCap.SampleShading);
// UI and debug
GL.Enable(EnableCap.Blend);
GL.PolygonMode(MaterialFace.Front, PolygonMode.Fill);
GL.Disable(EnableCap.DepthTest);
GL4.GL.BlendFuncSeparate(GL4.BlendingFactorSrc.SrcAlpha, GL4.BlendingFactorDest.OneMinusSrcAlpha, GL4.BlendingFactorSrc.One, GL4.BlendingFactorDest.One);
GL.ClipControl(ClipOrigin.LowerLeft, ClipDepthMode.NegativeOneToOne);
ui.Render();
// shadows.ShadowBuffer.DrawDepthBuffer();
// Draw to screen
multisampling.Draw();
SwapBuffers();
State.Time.CountFPS();
}