34 lines
912 B
Forth
34 lines
912 B
Forth
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#version 330
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#extension GL_ARB_separate_shader_objects : enable
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layout(location=1) in vec2 fsTex;
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layout(location=0) out vec4 target;
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uniform sampler2D graphTex;
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uniform ivec2 viewport;
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uniform vec4 color;
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uniform vec4 upperColor;
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uniform vec4 lowerColor;
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uniform float colorBorder;
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void main()
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{
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target = vec4(1.0f);
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float xStep = 1. / viewport.x;
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vec3 col = vec3(0.0f);
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vec2 current = vec2(fsTex.x, texture(graphTex, vec2(fsTex.x, 0.5f)).x);
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vec2 next = vec2(fsTex.x + xStep, texture(graphTex, vec2(clamp(fsTex.x + xStep, 0.0f, 1.0f) , 0.5f)).x);
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vec2 avg = (current + next) / 2.0;
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float dist = abs(distance(vec2(fsTex.x,fsTex.y * -1 + 1.),avg));
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if (avg.y >= colorBorder)
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col = upperColor.xyz;
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else
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col = lowerColor.xyz;
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target.xyz = vec3(col);
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target.a = smoothstep(abs(next.y - current.y) + 0.010, abs(next.y - current.y),dist);
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}
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