July 2009
Intermediate to advanced
936 pages
21h 41m
English
book
OpenGL Programming Guide: The Official Guide to Learning OpenGL, Versions 3.0 and 3.1, Seventh Edition
by Dave Shreiner - The Khronos OpenGL ARB Working Group
Content preview from OpenGL Programming Guide: The Official Guide to Learning OpenGL, Versions 3.0 and 3.1, Seventh Edition
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Appendix K. RGTC Compressed Texture Format
This appendix will describe the RG-texture compression format, used for compressing one- and two-component textures. It has the following major sections:
• “RGTC Overview”
RGTC Overview
The RGTC compressed texture format is a standardized compression format for one- and two-component textures. It is a block-based format where collections of 4 × 4 texel squares that are compressed into a 64-bit encodings for each component. The first two bytes of an encoding for a channel represent representative values, which may be linearly combined to compute the color of any pixel in the 4 × 4 block. The remaining 48-bits represent 16 three-bit codes used to determine the appropriate linear combination ...
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