stk-code_catmod/data/shaders/ppdisplace.frag

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#version 130
uniform sampler2D tex;
uniform sampler2D dtex;
uniform int viz;
void main()
{
vec2 tc = gl_TexCoord[0].xy;
vec4 shiftval = texture2D(dtex, tc) / vec4(50.0);
vec2 shift;
shift.x = -shiftval.x + shiftval.y;
shift.y = -shiftval.z + shiftval.w;
tc += shift;
vec4 newcol = texture2D(tex, tc);
if (viz < 1)
{
gl_FragColor = newcol;
} else
{
gl_FragColor = shiftval * vec4(50.0);
}
}