OpenGL Game Development (Wordware Applications Library) by Chris Seddon

By Chris Seddon

The Open pix Library (OpenGL) is the regular for high-performance 3D photographs and is everyday to create modern software program. OpenGL video game improvement indicates the start laptop programmer how one can harness the facility of OpenGL to create a completely practical map editor and online game engine. The ebook explores the fundamentals of OpenGL and home windows programming, whereas concentrating on the last word aim of constructing a 3D first-person shooter.

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This task can get very processor intensive depending on the scene you are trying to render. With the CPU wasting valuable cycles on drawing, other operations such as input, audio, and artificial intelligence (AI) will suffer because of the demands of the graphics. If the video card processed the scene very quickly, the other operations would be free to quickly do their tasks and give good frame rates to the user. Introduction to OpenGL | 47 Creating the Map Editor With this in mind, let’s move to the next section, which discusses how the world works in three dimensions.

The first parameter in the function is a handle to a menu (our Menu variable), which contains the currently loaded menu. The second parameter is the ID of the item to be modified. In this case we’ll use our newly created items ID_DRAWING_WIREFRAME and ID_DRAWING_ SOLID. The third parameter specifies the state of the menu item. A menu item has two simple states available for use. The first is MF_CHECKED, which just as it implies checks a specific menu item. The other state is MF_UNCHECKED, which unchecks the given item.

The message is Introducing Windows Programming | 27 Creating the Map Editor activated when the right mouse button is released. This message uses the lParam variable to obtain the X and Y coordinates of the mouse location upon release. To extract the X coordinate from the lParam variable we use the LOWORD macro and supply lParam as the parameter. The return value is the cursor X coordinate. To extract the Y coordinate we use the HIWORD macro and once again supply the lParam variable as the parameter.

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