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#version 110
uniform sampler2D tex;
uniform float fraction;
uniform float height;
const float c = -0.2;
const float border_max_height = 60.0;
mat4 contrast = mat4 (1.0 + c, 0.0, 0.0, 0.0,
0.0, 1.0 + c, 0.0, 0.0,
0.0, 0.0, 1.0 + c, 0.0,
0.0, 0.0, 0.0, 1.0);
vec4 off = vec4(0.633, 0.633, 0.633, 0);
void main()
{
vec4 color = texture2D(tex, cogl_tex_coord_in[0].xy);
float y = height * cogl_tex_coord_in[0].y;
// To reduce contrast, blend with a mid gray
cogl_color_out = color * contrast - off * c * color.a;
// We only fully dim at a distance of BORDER_MAX_HEIGHT from the top and
// when the fraction is 1.0. For other locations and fractions we linearly
// interpolate back to the original undimmed color, so the top of the window
// is at full color.
cogl_color_out = color + (cogl_color_out - color) * max(min(y / border_max_height, 1.0), 0.0);
cogl_color_out = color + (cogl_color_out - color) * fraction;
}
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