<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [HSW/BSW/BDW/SKL] Google Earth is not resolving all the details in the map correctly" href="https://bugs.freedesktop.org/show_bug.cgi?id=100925#c16">Comment # 16</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [HSW/BSW/BDW/SKL] Google Earth is not resolving all the details in the map correctly" href="https://bugs.freedesktop.org/show_bug.cgi?id=100925">bug 100925</a> from <a class="email" href="mailto:nanleychery@gmail.com" title="Nanley Chery <nanleychery@gmail.com>"> Nanley Chery</a> <pre>I found some text from the SKL PRM, Vol 5: Memory Views, that explains the errors we're seeing: Example of Opaque Color Encoding [...] 00 ? color_0 01 ? color_1 10 ? 2/3 color_0 + 1/3 color_1 11 ? 1/3 color_0 + 2/3 color_1 [...] Programming Note Context: Opaque Textures (DXT1_RGB) The behavior of this format is not compliant with the OGL spec Here's the OGL spec behaviour for reference: The RGB color for a texel at location (x,y) in the block is given by: RGB0, if color0 > color1 and code(x,y) == 0 RGB1, if color0 > color1 and code(x,y) == 1 (2*RGB0+RGB1)/3, if color0 > color1 and code(x,y) == 2 (RGB0+2*RGB1)/3, if color0 > color1 and code(x,y) == 3 RGB0, if color0 <= color1 and code(x,y) == 0 RGB1, if color0 <= color1 and code(x,y) == 1 (RGB0+RGB1)/2, if color0 <= color1 and code(x,y) == 2 BLACK, if color0 <= color1 and code(x,y) == 3 Arithmetic operations are done per component, and BLACK refers to an RGB color where red, green, and blue are all zero. <a href="http://developer.download.nvidia.com/opengl/specs/GL_EXT_texture_compression_s3tc.txt">http://developer.download.nvidia.com/opengl/specs/GL_EXT_texture_compression_s3tc.txt</a></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>