/usr/share/pymol/data/shaders/bg.vs is in pymol-data 1.8.4.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | attribute vec3 a_Vertex;
varying vec2 bgTextureLookup ;
uniform float isCentered;
uniform vec2 imageSize;
uniform vec2 screenCenter;
uniform vec2 pixelSize;
void main()
{
vec2 imageVertex = a_Vertex.xy;
imageVertex = pixelSize * floor(imageVertex / pixelSize);
gl_Position = vec4(imageVertex.x, imageVertex.y, .5, 1.);
bgTextureLookup = (1. + a_Vertex.xy) / 2.;
bgTextureLookup = pixelSize * floor(bgTextureLookup / pixelSize);
}
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