46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
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//https://godotshaders.com/shader/fisheye-shader/
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shader_type canvas_item;
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uniform sampler2D SCREEN_TEXTURE:hint_screen_texture,filter_linear;
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// 鱼眼效果强度控制
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uniform float fish_intensity : hint_range(0.0, 2.0) = 1.0;
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void fragment() {
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// 获取屏幕分辨率
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vec2 iResolution = vec2(textureSize(SCREEN_TEXTURE, 0));
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// 基础UV坐标（适配Godot坐标系）
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vec2 uv = UV;
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uv.y = 1.0 - uv.y; // 翻转Y轴
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// 宽高比计算
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float aspectRatio = iResolution.x / iResolution.y;
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// 计算强度参数
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float strength = fish_intensity * 0.03;
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vec2 intensity = vec2(
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strength * aspectRatio,
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strength * aspectRatio
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);
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// 坐标转换到[-1, 1]范围
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vec2 coords = uv;
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coords = (coords - 0.5) * 2.0;
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// 计算坐标偏移量
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vec2 realCoordOffs;
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realCoordOffs.x = (1.0 - coords.y * coords.y) * intensity.y * coords.x;
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realCoordOffs.y = (1.0 - coords.x * coords.x) * intensity.x * coords.y;
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// 应用偏移
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vec2 fuv = uv - realCoordOffs;
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// 边界检查
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if(fuv.x < 0.0 || fuv.x > 1.0 || fuv.y < 0.0 || fuv.y > 1.0) {
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COLOR = vec4(0.0); // 超出范围显示黑
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vec4 color = texture(SCREEN_TEXTURE,fuv);
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COLOR.rgb=mix(color.rgb,color.bgr,length(fuv-0.5));
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} else {
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// 采样时再次翻转Y轴适配Godot坐标系
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fuv.y = 1.0 - fuv.y;
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COLOR = texture(SCREEN_TEXTURE, fuv);
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vec4 color = texture(SCREEN_TEXTURE,fuv);
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COLOR.rgb=mix(color.rgb,color.bgr,length(fuv-0.5));
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}
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}
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