/usr/share/gem/examples/10.glsl/multitexture.frag is in gem-doc 1:0.93.3-9build1.
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 | uniform sampler2D MyTex;
uniform sampler2D MyTex1;
varying vec2 texcoord1;
varying vec2 texcoord2;
void main (void)
{
vec4 color = texture2D(MyTex, texcoord1);
vec4 color2 = texture2D(MyTex1, texcoord2);
gl_FragColor = (color + color2) / 2.;
}
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