38 lines
1013 B
GLSL
38 lines
1013 B
GLSL
#version 330 core
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out vec4 FragColor;
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uniform vec2 uViewport;
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uniform float uMinorStep;
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uniform float uMajorStep;
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float gridLine(float stepPx) {
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// 当前坐标像素
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vec2 coord = gl_FragCoord.xy;
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vec2 q = coord / stepPx;
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vec2 g = abs(fract(q - 0.5) - 0.5) / fwidth(q);
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float line = 1.0 - min(min(g.x, g.y), 1.0);
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return line;
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}
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void main() {
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vec2 viewport = max(uViewport, vec2(1.0));
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vec2 uv = gl_FragCoord.xy / viewport;
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vec3 topCol = vec3(0.99, 0.99, 1.00);
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vec3 botCol = vec3(0.94, 0.95, 0.98);
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vec3 col = mix(botCol, topCol, uv.y);
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float minor = gridLine(max(uMinorStep, 1.0));
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float major = gridLine(max(uMajorStep, 1.0));
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vec3 minorCol = vec3(0.80, 0.82, 0.87);
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vec3 majorcol = vec3(0.70, 0.73, 0.80);
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col = mix(col, minorCol, minor * 0.22);
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col = mix(col, majorcol, major * 0.35);
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vec2 p = uv * 2.0 - 1.0;
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float v = clamp(1.0 - dot(p, p) * 0.12, 0.0, 1.0);
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col *= mix(1.0, v, 0.35);
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FragColor = vec4(col, 1.0);
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}
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