44 lines
930 B
GLSL
44 lines
930 B
GLSL
#version 300 es
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precision mediump float;
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layout(std140) uniform Uniforms {
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float startDate;
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float endDate;
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float currentDate;
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float radius;
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float d;
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float padding1; // 填充以对齐到8字节边界
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vec2 viewportSize;
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};
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struct Instant {
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vec2 position;
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vec4 color;
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};
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in Instant i_instant;
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out vec4 FragColor;
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float sdVesica(vec2 p, float r, float d)
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{
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p = abs(p);
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float b = sqrt(r*r-d*d); // can delay this sqrt by rewriting the comparison
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return ((p.y-b)*d > p.x*b) ? length(p-vec2(0.0,b))*sign(d)
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: length(p-vec2(-d,0.0))-r;
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}
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void main() {
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vec2 p = gl_FragCoord.xy - i_instant.position;
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float sdf = sdVesica(p, radius, d);
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// 简化逻辑：内部完全不透明，外部丢弃
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if (sdf > 0.0) {
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discard;
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}
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// 测试：固定颜色确保能看到
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FragColor = vec4(1.0, 1.0, 1.0, 1.0); // 纯白色
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}
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