画出虚线来了

shaders/texture_loading/glsl/point_line.frag

@@ -1,67 +1,48 @@
 #version 450
 
 layout(location = 0) in vec3 fragColor;
-layout(location = 1) in vec3 fragSegmentStart;
+layout(location = 1) in vec3 fragLineStart;
-layout(location = 2) in vec3 fragSegmentEnd;
+layout(location = 2) in vec3 fragLineEnd;
-//layout(location = 3) in vec3 fragWorldPos;
 
 layout(location = 0) out vec4 outColor;
 
-layout(binding = 0) uniform UniformBufferObject {
-    mat4 proj;
-    mat4 model;
-    mat4 view;
-} ubo;
-
-layout(binding = 1) uniform DashParameters {
-    float dashSize;
-    float gapSize;
-    float dashOffset;
-    float uAASize;
-    int useWorldSpace;
-} dashParams;
-
 void main() {
-    // 转换为NDC坐标
+    vec2 fragPos = gl_FragCoord.xy;
-    vec3 ndcStart = fragSegmentStart / fragSegmentStart.z;
-    vec3 ndcEnd = fragSegmentEnd / fragSegmentEnd.z;
-    vec3 fragNDC = gl_FragCoord.xyz / gl_FragCoord.z;
-    fragNDC = (fragNDC * 2.0) - 1.0;
     
-    // 计算当前片元在线段上的投影
+    vec2 start = (fragLineStart.xy * 0.5 + 0.5) * 480.0;
-    vec2 lineDir = normalize(ndcEnd.xy - ndcStart.xy);
+    vec2 end = (fragLineEnd.xy * 0.5 + 0.5) * 480.0;
-    vec2 startToFrag = fragNDC.xy - ndcStart.xy;
-    float projection = dot(startToFrag, lineDir);
     
-    // 计算线段在屏幕空间的长度（用于抗锯齿）
+    vec2 lineDir = end - start;
-    float segmentLength = length(ndcEnd.xy - ndcStart.xy);
+    float lineLength = length(lineDir);
     
-    // 应用虚线模式
+    if (lineLength < 1.0) {
-    float dashPeriod = dashParams.dashSize + dashParams.gapSize;
+        outColor = vec4(fragColor, 1.0);
-    float currentPos = mod(projection + dashParams.dashOffset, dashPeriod);
+        return;
+    }
     
-    // 抗锯齿处理
+    lineDir = normalize(lineDir);
-    float alpha = 1.0;
+    vec2 toFrag = fragPos - start;
+    float projection = dot(toFrag, lineDir);
+    projection = clamp(projection, 0.0, lineLength);
     
-    // 线段开始处的抗锯齿（避免线段起始处出现半截虚线）
+    vec2 closestPoint = start + lineDir * projection;
-    alpha *= smoothstep(0.0, dashParams.uAASize / segmentLength, projection);
+    float distanceToLine = length(fragPos - closestPoint);
     
-    // 线段结束处的抗锯齿  
+    float lineWidth = 6.0;
-    alpha *= 1.0 - smoothstep(segmentLength - dashParams.uAASize / segmentLength, 
-                             segmentLength, projection);
     
-    // 虚线模式抗锯齿
+    if (distanceToLine > lineWidth) {
-    alpha *= 1.0 - smoothstep(dashParams.dashSize, 
+        discard;
-                             dashParams.dashSize + dashParams.uAASize / dashPeriod, 
+    }
-                             currentPos);
     
-    // 如果alpha接近0，直接丢弃片元
+    float dashLength = 50.0;  
+    float gapLength = 20.0;   
     
-    // if (alpha < 0.01) {
+    float patternLength = dashLength + gapLength;
-    //     discard;
+    float patternPos = mod(projection, patternLength);
-    // }
     
-    // outColor = vec4(fragColor, alpha);
+    if (patternPos > dashLength) {
+        discard;
+    }
     
-    outColor = vec4(1, 0, 0, 1.0);
+    outColor = vec4(fragColor, 1.0);
 }