910GL datasheet(240/426 Pages) INTEL

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Functional Description

240

Datasheet

12.6.3.9

Cubic Environment Mapping

Environment maps allow applications to render scenes with complex lighting and reflections

while significantly decreasing processor load. There are several methods to generate environment

maps (such as, spherical, circular and cubic). The GMCH supports cubic reflection mapping over

spherical and circular since it is the best choice to provide real-time environment mapping for

complex lighting and reflections.

Cubic Mapping requires a texture map for each of the 6 cube faces. These can be generated by

pointing a camera with a 90-degree field-of-view in the appropriate direction. Per-vertex vectors

(normal, reflection or refraction) are interpolated across the polygon and the intersection of these

vectors with the cube texture faces is calculated. Texel values are then read from the intersection

point on the appropriate face and filtered accordingly.

12.6.4

Raster Engine

The Raster Engine is where the color data (such as fogging, specular RGB, texture map blending,

etc.) is processed. The final color of the pixel is calculated and the RGBA value combined with

the corresponding components resulting from the Texture Engine. These textured pixels are

modified by the specular and fog parameters. These specular highlighted, fogged, textured pixels

are color blended with the existing values in the frame buffer. In parallel, stencil, alpha and depth

buffer tests are conducted which will determine whether the Frame and Depth Buffers will be

updated with the new pixel values.

12.6.4.1

Texture Map Blending

Multiple Textures can be blended together in an iterative process and applied to a primitive. The

GMCH allows up to four texture coordinates and texture maps to be specified onto the same

polygon. Also, the GMCH supports using a texture coordinate set to access multiple texture maps.

State variables in multiple texture are bound to texture coordinates, texture map or texture

blending.

12.6.4.2

Combining Intrinsic and Specular Color Components

The GMCH allows an independently specified and interpolated “specular RGB” attribute to be

added to the post-texture blended pixel color. This feature provides a full RGB specular highlight

to be applied to a textured surface, permitting a high-quality reflective colored lighting effect not

available in devices which apply texture after the lighting components have been combined. If

specular-add state variable is disabled, only the resultant colors from the map blending are used.

If this state variable is enabled, RGB values from the output of the map blending are added to

values for RS, GS, BS on a component by component basis.

12.6.4.3

Color Shading Modes

The Raster Engine supports the flat and Gouraud shading modes. These shading modes are

programmed by the appropriate state variables issued through the command stream.

Flat shading is performed by smoothly interpolating the vertex intrinsic color components (Red,

Green, Blue), Specular Highlights(R,G,B), Fog, and Alpha to the pixel, where each vertex color

has the same value. The setup engine substitutes one of the vertex’s attribute values for the other

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