38 lines
963 B
GLSL
38 lines
963 B
GLSL
#version 330
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in vec2 uv; /* image uv */
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in vec4 border; /* uv length of border, normalized to image dimensions; left, bottom, right, top */
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in vec2 scale; /* polygon dimensions ~ texture dimensions */
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in vec4 fcolor;
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out vec4 color;
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uniform sampler2D image;
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float map(float value, float min1, float max1, float min2, float max2)
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{
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return min2 + (value - min1) * (max2 - min2) / (max1 - min1);
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}
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float processAxis(float coord, float texBorder, float winBorder)
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{
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if (coord < winBorder)
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return map(coord, 0, winBorder, 0, texBorder);
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if (coord < 1 - winBorder)
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return map(coord, winBorder, 1 - winBorder, texBorder, 1 - texBorder);
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return map(coord, 1 - winBorder, 1, 1 - texBorder, 1);
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}
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vec2 uv9slice(vec2 uv, vec2 s, vec4 b)
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{
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vec2 t = clamp((s * uv - b.xy) / (s - b.xy - b.zw), 0.0, 1.0);
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return mix(uv * s, 1.0 - s * (1.0 - uv), t);
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}
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void main()
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{
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vec2 nuv = uv9slice(uv, scale, border);
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color = fcolor * texture(image, uv);
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}
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