910GL datasheet(238/426 Pages) INTEL

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Functional Description

238

Datasheet

12.6.3

Texture Engine

The GMCH allows an image, pattern, or video to be placed on the surface of a 3D polygon.

The texture processor receives the texture coordinate information from the setup engine and the

texture blend information from the scan converter. The texture processor performs texture color

or ChromaKey matching, texture filtering (anisotropic, trilinear, and bilinear interpolation), and

YUV to RGB conversions.

12.6.3.1

Perspective Correct Texture Support

A textured polygon is generated by mapping a 2D texture pattern onto each pixel of the polygon.

A texture map is like wallpaper pasted onto the polygon. Since polygons are rendered in

perspective, it is important that texture be mapped in perspective as well. Without perspective

correction, texture is distorted when an object recedes into the distance.

12.6.3.2

Texture Formats and Storage

The GMCH supports up to 32 bits of color for textures.

12.6.3.3

Texture Decompression

DirectX supports Texture Compression to reduce the bandwidth required to deliver textures. As

the textures’ average size gets larger with higher color depth and multiple textures become the

norm, it becomes increasingly important to provide a mechanism for compressing textures.

Texture decompression formats supported include DXT1, DXT2, DXT3, DXT4, DXT5 and

FXT1.

12.6.3.4

Texture ChromaKey

ChromaKey describes a method of removing a specific color or range of colors from a texture

map before it is applied to an object. For “nearest” texture filter modes, removing a color simply

makes those portions of the object transparent (the previous contents of the back buffer show

through). For “linear“ texture filtering modes, the texture filter is modified if only the non-nearest

neighbor texels match the key (range).

12.6.3.5

Anti-Aliasing

Aliasing is one of the artifacts that degrade image quality. In its simplest manifestation, aliasing

causes the jagged staircase effects on sloped lines and polygon edges. Another artifact is the

moiré patterns that occur as a result of a very small number of pixels available on screen to

contain the data of a high resolution texture map. More subtle effects are observed in animation,

where very small primitives blink in and out of view.

12.6.3.6

Texture Map Filtering

The GMCH supports many texture mapping modes. Perspective correct mapping is always

performed. As the map is fitted across the polygon, the map can be tiled, mirrored in either the U

or V directions, or mapped up to the end of the texture and no longer placed on the object (this is

known as clamp mode). The way a texture is combined with other object attributes is also

definable.

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