/usr/share/games/trackballs/shaders/reflection.vert is in trackballs-data 1.2.4-1.
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 17 18 19 20 21 22 23 24 25 26 27 28 29 | #version 130
#ifdef GL_ES
precision mediump int;
precision mediump float;
#endif
uniform mat4 proj_matrix;
uniform mat4 model_matrix;
attribute vec3 in_Position;
attribute vec4 in_Color;
attribute vec2 in_Texcoord;
attribute vec4 in_Normal;
varying vec3 cpos;
varying vec3 inormal;
varying vec3 upvector;
void main(void) {
vec4 pos = vec4(in_Position.x, in_Position.y, in_Position.z, 1.);
mat4 mvp_matrix = proj_matrix * model_matrix;
gl_Position = mvp_matrix * pos;
cpos = vec4(model_matrix * pos).xyz;
upvector = vec4(model_matrix * vec4(0, 0, 1, 0)).xyz;
// As model_matrix M is orthogonal, M = transpose(inverse(M))
inormal = vec4(model_matrix * 2. * vec4(in_Normal.xyz - 0.5, 0.)).xyz;
}
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