public void Draw()
{
// it is example with using a second FBO
// gen FBO
GenTexturedFBO();
// set scene viewport according to items size
GL.Viewport(0, 0, GetWidth(), GetHeight());
// crear color and depth bits
GL.Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
///////////////
// draw cube with light
GL.UseProgram(_shaderCommon);
UniformSender.SendColorAsUniformVariable(_shaderCommon, Color.White, "lightColor");
UniformSender.SendVec3AsUniformVariable(_shaderCommon, new float[] { 1.2f, 1.0f, 2.0f }, "lightPos");
UniformSender.SendMVPAsUniformVariable(_shaderCommon, _model, _view, _projection);
BindCubeBuffer();
UniformSender.SendColorAsUniformVariable(_shaderCommon, _color, "objectColor");
GL.DrawArrays(GL_TRIANGLES, 0, _VBOlenght);
// optionally: draw edges
UniformSender.SendColorAsUniformVariable(_shaderCommon, Color.Black, "objectColor");
GL.DrawArrays(GL_LINE_STRIP, 0, _VBOlenght);
// using light of lamp
GL.UseProgram(_shaderLamp);
BindLampBuffer();
GL.DrawArrays(GL_TRIANGLES, 0, _VBOlenght);
/////////////////
// unbind second FBO and restore viewport to current window
UnbindFBO();
RenderService.SetGLLayerViewport(GetHandler(), this);
// draw FBO texture
GL.UseProgram(_shaderTexture);
GenTextureBuffers();
BindTexture();
UniformSender.SendUniformSample2D(_shaderTexture, "tex");
GL.DrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, IntPtr.Zero);
// delete resources
GL.DeleteFramebuffersEXT(1, _FBO);
GL.DeleteRenderbuffersEXT(1, _depthrenderbuffer);
GL.DeleteTextures(1, _texture);
GL.DeleteBuffers(2, _buffers);
GL.DisableVertexAttribArray(0);
GL.DisableVertexAttribArray(1);
}
