private void OnLoad(object sender, EventArgs e)
{
// initialize and bind framebuffer
_framebuffer = new Framebuffer();
_framebuffer.Bind(FramebufferTarget.Framebuffer);
// initialize a renderbuffer and bind it to the depth attachment
// to support depth testing while rendering to the texture
_depthBuffer = new Renderbuffer();
_depthBuffer.Init(RenderbufferStorage.DepthComponent, FramebufferWidth, FramebufferHeight);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, _depthBuffer);
// initialize texture and bind it to the color attachment
_texture = new Texture2D(SizedInternalFormat.Rgba8, FramebufferWidth, FramebufferHeight, 1);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, _texture);
Framebuffer.Unbind(FramebufferTarget.Framebuffer);
// initialize demonstration geometry
_cube = new ColorCube();
_cube.UpdateBuffers();
_quad = new TexturedQuad();
_quad.UpdateBuffers();
// initialize shaders
_colorProgram = ProgramFactory.Create<SimpleColorProgram>();
_textureProgram = ProgramFactory.Create<SimpleTextureProgram>();
// set up vertex attributes for the cube
_cubeVao = new VertexArray();
_cubeVao.Bind();
_cubeVao.BindAttribute(_colorProgram.InPosition, _cube.VertexBuffer);
_cubeVao.BindAttribute(_colorProgram.InColor, _cube.ColorBuffer);
_cubeVao.BindElementBuffer(_cube.IndexBuffer);
// set up vertex attributes for the quad
_quadVao = new VertexArray();
_quadVao.Bind();
_quadVao.BindAttribute(_textureProgram.InPosition, _quad.VertexBuffer);
_quadVao.BindAttribute(_textureProgram.InTexCoord, _quad.TexCoordBuffer);
// set camera position
Camera.DefaultState.Position = new Vector3(0,0,3);
Camera.ResetToDefault();
// enable depth testing
GL.Enable(EnableCap.DepthTest);
}
/// <summary>
/// Attaches the render buffer to the given attachment point.
/// </summary>
/// <param name="target">The framebuffer target to bind to.</param>
/// <param name="attachment">The attachment point to attach to.</param>
/// <param name="renderbuffer">Render buffer to attach.</param>
public void Attach(FramebufferTarget target, FramebufferAttachment attachment, Renderbuffer renderbuffer)
{
AssertActive(target);
GL.FramebufferRenderbuffer(target, attachment, RenderbufferTarget.Renderbuffer, renderbuffer.Handle);
CheckState(target);
}
/// <summary>
/// Attaches the render buffer to the given attachment point.
/// </summary>
/// <param name="target">The framebuffer target to bind to.</param>
/// <param name="attachment">The attachment point to attach to.</param>
/// <param name="renderbuffer">Render buffer to attach.</param>
public void Attach(FramebufferTarget target, FramebufferAttachment attachment, Renderbuffer renderbuffer)
{
AssertActive(target);
GL.FramebufferRenderbuffer(target, attachment, RenderbufferTarget.Renderbuffer, renderbuffer.Handle);
CheckState(target);
}