71 lines
2.4 KiB
Plaintext
71 lines
2.4 KiB
Plaintext
shader_type canvas_item;
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uniform float outline_thickness: hint_range(0.0, 8.0, 0.5) = 1.0;
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uniform vec4 outline_color: source_color = vec4(1.0);
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uniform bool high_performance_mode = true; // 高性能模式，减少采样
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void vertex() {
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VERTEX += (UV * 2.0 - 1.0) * outline_thickness;
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}
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void fragment() {
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vec2 uv = UV;
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vec2 texture_pixel_size = vec2(1.0) / (vec2(1.0) / TEXTURE_PIXEL_SIZE + vec2(outline_thickness * 2.0));
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uv = (uv - texture_pixel_size * outline_thickness) * TEXTURE_PIXEL_SIZE / texture_pixel_size;
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vec4 texture_color = vec4(0.0);
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if (uv.x >= 0.0 && uv.x <= 1.0 && uv.y >= 0.0 && uv.y <= 1.0) {
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texture_color = texture(TEXTURE, uv);
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}
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// 如果当前像素不透明，直接设置颜色
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if (texture_color.a > 0.5) {
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COLOR = texture_color;
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} else {
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// 需要计算描边
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float outline_alpha = 0.0;
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if (high_performance_mode) {
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// 高性能模式：只检查4个主要方向
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vec2 directions[4] = {
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vec2(outline_thickness, 0.0),
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vec2(-outline_thickness, 0.0),
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vec2(0.0, outline_thickness),
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vec2(0.0, -outline_thickness)
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};
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for (int i = 0; i < 4; i++) {
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vec2 check_uv = uv + directions[i] * TEXTURE_PIXEL_SIZE;
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if (check_uv.x >= 0.0 && check_uv.x <= 1.0 && check_uv.y >= 0.0 && check_uv.y <= 1.0) {
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float check_alpha = texture(TEXTURE, check_uv).a;
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outline_alpha = max(outline_alpha, check_alpha);
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if (outline_alpha > 0.9) break; // 早期退出
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}
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}
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} else {
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// 标准模式：8方向检查
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vec2 directions[8] = {
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vec2(outline_thickness, 0.0), vec2(-outline_thickness, 0.0),
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vec2(0.0, outline_thickness), vec2(0.0, -outline_thickness),
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vec2(outline_thickness * 0.707, outline_thickness * 0.707),
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vec2(-outline_thickness * 0.707, outline_thickness * 0.707),
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vec2(outline_thickness * 0.707, -outline_thickness * 0.707),
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vec2(-outline_thickness * 0.707, -outline_thickness * 0.707)
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};
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for (int i = 0; i < 8; i++) {
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vec2 check_uv = uv + directions[i] * TEXTURE_PIXEL_SIZE;
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if (check_uv.x >= 0.0 && check_uv.x <= 1.0 && check_uv.y >= 0.0 && check_uv.y <= 1.0) {
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float check_alpha = texture(TEXTURE, check_uv).a;
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outline_alpha = max(outline_alpha, check_alpha);
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if (outline_alpha > 0.9) break; // 早期退出
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}
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}
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}
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// 混合颜色
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float final_alpha = outline_alpha * outline_color.a;
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COLOR = vec4(outline_color.rgb * final_alpha + texture_color.rgb * texture_color.a,
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max(final_alpha, texture_color.a));
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}
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} |