43 lines
1.2 KiB
GLSL
43 lines
1.2 KiB
GLSL
#version GLSL_VERSION
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uniform uvec2 viewport;
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uniform vec3 default_bg;
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uniform vec3 active_border_color;
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uniform vec3 inactive_border_color;
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uniform vec3 bell_border_color;
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in uvec4 rect; // left, top, right, bottom
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in uint rect_color;
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out vec3 color;
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// indices into the rect vector
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const int LEFT = 0;
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const int TOP = 1;
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const int RIGHT = 2;
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const int BOTTOM = 3;
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const uint FF = uint(0xff);
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const uvec2 pos_map[] = uvec2[4](
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uvec2(RIGHT, TOP),
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uvec2(RIGHT, BOTTOM),
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uvec2(LEFT, BOTTOM),
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uvec2(LEFT, TOP)
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);
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vec2 to_opengl(uint x, uint y) {
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return vec2(
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-1.0 + 2.0 * (float(x) / float(viewport.x)),
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1.0 - 2.0 * (float(y) / float(viewport.y))
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);
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}
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float to_color(uint c) {
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return float(c & FF) / 255.0;
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}
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void main() {
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uvec2 pos = pos_map[gl_VertexID];
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gl_Position = vec4(to_opengl(rect[pos.x], rect[pos.y]), 0, 1);
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int rc = int(rect_color);
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vec3 window_bg = vec3(to_color(rect_color >> 24), to_color(rect_color >> 16), to_color(rect_color >> 8));
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color = float(1 & rc) * default_bg + float((2 & rc) >> 1) * active_border_color + float((4 & rc) >> 2) * inactive_border_color + float((8 & rc) >> 3) * window_bg + float((16 & rc) >> 4) * bell_border_color;
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}
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