55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
#pragma once
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#include <string>
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inline const std::string QUADTRAIL = R"#(
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uniform mat3 proj;
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uniform vec4 color;
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attribute vec2 pos;
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attribute vec2 texcoord;
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attribute vec4 colors;
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varying vec4 v_color;
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varying vec2 v_texcoord;
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void main() {
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gl_Position = vec4(proj * vec3(pos, 1.0), 1.0);
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v_color = color;
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v_texcoord = texcoord;
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})#";
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inline const std::string FRAGTRAIL = R"#(
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precision mediump float;
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varying vec4 v_color;
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varying vec2 v_texcoord;
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uniform vec4 window;
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float distToRect(vec4 rect) {
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float dx = max(rect[0] - v_texcoord[0], max(0.0, v_texcoord[0] - rect[2]));
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float dy = max(rect[1] - v_texcoord[1], max(0.0, v_texcoord[1] - rect[3]));
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return sqrt(dx*dx + dy*dy);
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}
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float alphaForShot(vec4 shot, float threshold) {
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float dist = distToRect(shot);
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if (dist > threshold)
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return 0.0;
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if (dist <= 0.0)
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return 0.0;
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return 1.0 - (dist * (1.0 / threshold));
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}
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void main() {
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vec4 pixColor = v_color;
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float a = v_color[3]; // clamp(alphaForShot(window, 0.5), 0.0, 1.0); // todo
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pixColor.rgb *= a;
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gl_FragColor = pixColor;
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})#";
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