Advanced 3D Game Programming with DirectX 9 by Peter Walsh

By Peter Walsh

Textual content is an replace to the previous textual content, complicated 3D video game Programming utilizing DirectX 8.0; targeting implementation adjustments to DirectX 9.0. For programmers who're new to pix and video game programming. Softcover. DLC: laptop games--Programming.

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Parameters: LOWORD(lParam) The x-location of the mouse, relative to the upper left corner of the client area. HIWORD(lParam) The y-location of the mouse, relative to the upper left corner of the client area. wParam Key flags. This helps you tell what the keyboard state is for special clicks (such as Alt-left click, for example). Test the key flags to see if certain flags are set. The flags are: MK_CONTROL: Indicates the Control key is down. MK_LBUTTON: Indicates the left mouse button is down. MK_MBUTTON: Indicates the middle mouse button is down.

One is the client area coordinate space. The origin (0,0) is the top left corner of the window (known as client space). Coordinates relative to the client area don't need to change when the window is moved around the screen. The other coordinate space is the desktop coordinate space. This space is absolute, and the origin is the top left corner of the screen (also known as screen space). Windows uses the POINT structure to represent 2D coordinates. It has two long integers, one for the horizontal component and one for the vertical: typedef struct tagPOINT { LONG x; LONG y; } POINT; Since all windows are rectangular, Windows has a structure to represent a rectangle.

In C++, COM objects just inherit one or more abstract base classes, which are called COM interfaces. Other classes can get a COM object to do work by calling functions in its interfaces, but that's it. There are no other functions besides the ones in the interfaces, and no access to member variables outside of Get/Set functions existing in the interfaces. All COM interfaces derive, either directly or indirectly, from a class called IUnknown. In technical terms, this means the first three entries in the vTable of all COM interfaces are the same three functions of IUnknown.

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