void Render(IntPtr pParameter)
{
TRectF sectionRect;
uint txt_w, txt_h;
TColor4 white = TColor4.ColorWhite();;
pRender2D.Begin2D();
// First section with primitives. //
sectionRect = new TRectF(0f, 0f, ScreenWidth / 2f, ScreenHeight / 2f);
pRender.EnableScissor(ref sectionRect); // here and below scissor test is used to prevent drawing something to another section of the screen
DrawPrimitives(sectionRect);
pRender2D.DrawRectangle(ref sectionRect, ref white);
const string txtSec1 = "Primitives";
pFont.GetTextDimensions(txtSec1, out txt_w, out txt_h);
// here and below draw section label near the end of each section
pFont.Draw2DSimple((int)((ScreenWidth / 2 - txt_w) / 2), (int)(ScreenHeight / 2 - txt_h), txtSec1, ref white);
// Second section with font rendering. //
sectionRect = new TRectF(ScreenWidth / 2f, 0f, ScreenWidth / 2f, ScreenHeight / 2f);
pRender.EnableScissor(ref sectionRect);
DrawFont(sectionRect);
pRender2D.DrawRectangle(ref sectionRect, ref white);
const string txtSec2 = "Fonts";
pFont.GetTextDimensions(txtSec2, out txt_w, out txt_h);
pFont.Draw2DSimple((int)(ScreenWidth / 2 + (ScreenWidth / 2 - txt_w) / 2),
(int)(ScreenHeight / 2 - txt_h), txtSec2, ref white);
// Third section with sprites. //
sectionRect = new TRectF(0f, ScreenHeight / 2f, ScreenWidth / 2f, ScreenHeight / 2f);
pRender.EnableScissor(ref sectionRect);
DrawSprites(sectionRect);
pRender2D.DrawRectangle(ref sectionRect, ref white);
const string txtSec3 = "Sprites";
pFont.GetTextDimensions(txtSec3, out txt_w, out txt_h);
pFont.Draw2DSimple((int)((ScreenWidth / 2 - txt_w) / 2f), (int)(ScreenHeight - txt_h - 25), txtSec3, ref white);
// Fourth section with advanced techniques. //
sectionRect = new TRectF(ScreenWidth / 2f, ScreenHeight / 2f, ScreenWidth / 2f, ScreenHeight / 2f);
pRender.EnableScissor(ref sectionRect);
DrawAdvanced(sectionRect);
pRender2D.DrawRectangle(ref sectionRect, ref white);
const string txtSec4 = "Advanced";
pFont.GetTextDimensions(txtSec4, out txt_w, out txt_h);
pFont.Draw2DSimple((int)(ScreenWidth / 2 + (ScreenWidth / 2 - txt_w) / 2f), (int)(ScreenHeight - txt_h - 25), txtSec4, ref white);
pRender.DisableScissor(); // The way to turn off scissor test, you must do it manually before the end of the frame.
pRender2D.End2D();
}