The information in this section pertains only to applications written in C and C++. See DirectDraw Visual Basic Tutorials.

The sample in Tutorial 2 (DDEx2) takes a bitmap and puts it in the back buffer, and then it flips between the back buffer and the primary buffer. This is not a very realistic approach to displaying bitmaps. The sample in this tutorial (DDEx3) expands on the capabilities of DDEx2 by including two off-screen buffers in which the two bitmaps—one for the even screen and one for the odd screen—are stored. It uses the IDirectDrawSurface7::BltFast method to copy the contents of an off-screen surface to the back buffer, and then it flips the buffers and copies the next off-screen surface to the back buffer.

The new functionality demonstrated in DDEx3 is shown in the following steps.

• Step 1: Create the Off-Screen Surfaces
• Step 2: Load the Bitmaps to the Off-Screen Surfaces
• Step 3: Blit the Off-Screen Surfaces to the Back Buffer