OpenGL ES* 1.0 Framework Software Developer's Guide

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3D FeaturesR2.4.7 Texture Mapping and FilteringMany texture mapping and filtering modes are supported. Perspective correct mapping is alwaysperformed. As the map is fitted across the triangle, the map will be tiled. The way a texture iscombined with other object attributes is also definable.The 2700G Multimedia Accelerator supports up to twelve Levels-of-Detail (LODs) ranging in sizefrom 2048x2048 to 1x1 texels. (A texel is defined as a texture map element). Textures do not haveto be square.The 2700G Multimedia Accelerator OpenGL ES implementation supports six types of texturefiltering:• Point Sampling: Texel with coordinates nearest to the desired pixel is used. This mode onlyrequires one level-of-detail to be present.• Bilinear Filtering: A weighted average of the texels in a 2x2 area surrounding the desiredpixel is used. This mode only requires one level-of-detail to be present.• Point Mipmapping: This is used if many LODs are present. The nearest LOD is chosen andthe texel with coordinates nearest to the desired pixel is used.• Bilinear Mipmapping: This is used if many LODs are present. The nearest LOD is chosen anda weighted average of the texels in a 2x2 area surrounding the desired pixel is used.• Point Mipmapping Linear: This is used if many LODs are present. Two appropriate LODs areselected and within each LOD, the texel with coordinates nearest to the desired pixel isselected. The final texture value is generated by linear interpolation between the two texelsselected from each of the LODs.• Trilinear Mipmapping: This is used if many LODs are present. Two appropriate LODs areselected and a weighted average of a 2x2 area of texels surrounding the desired pixel in eachLOD is generated (four texels per LOD). The final texture value is generated by linearinterpolation between the two texels generated for each of the LODs. Trilinear mipmapping isused to minimize the visibility of LOD transitions across an object.16 OpenGL ES* 1.0 Framework Software Developer’s Guide
OpenGL ES Framework ImplementationR3 OpenGL ES FrameworkImplementation3.1 OverviewOpenGL ES* is an API intended to support high-performance graphics with little overhead asrequired by embedded systems. There are three ‘profiles’ covered by the OpenGL ES 1.0specification to allow for platform-specific implementations:• Common• Common-Lite• Safety CriticalThe Common and Common-Lite profiles are intended for use in consumer entertainment andrelated devices such as PDAs, cell phones, and game consoles by offering fully functional 3Dcapabilities with texture mapping. The Safety Critical implementation is intended for industrialapplications and consumer applications where high reliability and minimum footprint are essential.The 2700G Multimedia Accelerator drivers support the Common-Lite profile of the OpenGL ES1.0 specification.For more information on the OpenGL ES specifications, the full documentation and header filescan be downloaded from Khronos* at http://www.khronos.org/opengles/spec.html3.2 Functions SupportedIn Table 1 and Table 2 the following notations apply:● = Supported API○ = Unsupported API.Table 1. OpenGL ES Functions Supported in the Common-Lite ProfileglActiveTextureglAlphaFuncglAlphaFuncxglBindTextureFunction Supported Special Considerations●○●●glBlendFunc ● SRC_ALPHA_SATURATE is not supportedglClearglClearColorglClearColorx●○●OpenGL ES* 1.0 Framework Software Developer’s Guide 17
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OpenGL ES* 1.0 Framework Software Developer's Guide

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