/usr/src/castle-game-engine-5.2.0/opengl/glsl/rectangle.fs is in castle-game-engine-src 5.2.0-2.
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 | #ifdef GL_ES
precision mediump float;
#endif
uniform vec4 color;
void main(void)
{
gl_FragColor = color;
}
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