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@@ -18,7 +18,7 @@ CCEffect %{
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properties:
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edgeColor: { value: [1.0, 1.0, 1.0, 1.0] }
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textureSize: { value: [512.0, 512.0] }
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- edgeWidth: { value: 40.0 }
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+ edgeWidth: { value: 50.0 }
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alphaThreshold: { value: 0.5 }
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}%
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@@ -67,7 +67,7 @@ CCProgram sprite-fs %{
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precision highp float;
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#include <builtin/internal/embedded-alpha>
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#include <builtin/internal/alpha-test>
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- #define MAX_EDGE_WIDTH 15.0 // 最大边缘宽度（可根据需求调整）
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+ #define MAX_EDGE_WIDTH 50.0 // 最大边缘宽度（可根据需求调整）
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in vec4 color;
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#if USE_TEXTURE
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@@ -96,19 +96,41 @@ CCProgram sprite-fs %{
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float edgeDetected = 0.0;
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if (currentAlpha > 0.01) {
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// Check if we're at the edge by sampling neighboring pixels
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- for (float x = -MAX_EDGE_WIDTH; x <= MAX_EDGE_WIDTH; x += 1.0) {
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- for (float y = -MAX_EDGE_WIDTH; y <= MAX_EDGE_WIDTH; y += 1.0) {
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- if (x == 0.0 && y == 0.0) continue;
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-
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- vec2 sampleUV = uv0 + vec2(x, y) * texelSize;
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- float sampleAlpha = CCSampleWithAlphaSeparated(cc_spriteTexture, sampleUV).a;
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-
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- // If we find a transparent pixel nearby, we're at an edge
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- if (sampleAlpha < 0.01) {
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- float distance = length(vec2(x, y));
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- if (distance <= edgeWidth) {
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- float edgeStrength = 1.0 - (distance / edgeWidth);
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- edgeDetected = max(edgeDetected, edgeStrength);
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+ float maxDistance = min(edgeWidth, MAX_EDGE_WIDTH);
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+ bool isEdge = false;
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+
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+ // Check boundary conditions first (image edges)
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+ vec2 pixelPos = uv0 * textureSize;
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+ float distToLeft = pixelPos.x;
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+ float distToRight = textureSize.x - pixelPos.x;
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+ float distToTop = pixelPos.y;
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+ float distToBottom = textureSize.y - pixelPos.y;
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+
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+ float minDistToBorder = min(min(distToLeft, distToRight), min(distToTop, distToBottom));
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+
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+ if (minDistToBorder <= maxDistance) {
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+ isEdge = true;
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+ edgeDetected = max(edgeDetected, 1.0 - (minDistToBorder / maxDistance));
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+ }
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+
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+ // Also check for alpha transitions
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+ if (!isEdge) {
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+ // 改为固定范围循环（-MAX_EDGE_WIDTH 到 MAX_EDGE_WIDTH）
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+ for (float x = -MAX_EDGE_WIDTH; x <= MAX_EDGE_WIDTH; x += 1.0) {
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+ for (float y = -MAX_EDGE_WIDTH; y <= MAX_EDGE_WIDTH; y += 1.0) {
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+ if (x == 0.0 && y == 0.0) continue;
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+
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+ vec2 sampleUV = uv0 + vec2(x, y) * texelSize;
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+ float sampleAlpha = CCSampleWithAlphaSeparated(cc_spriteTexture, sampleUV).a;
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+
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+ // If we find a transparent pixel nearby, we're at an edge
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+ if (sampleAlpha < 0.01) {
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+ float distance = length(vec2(x, y));
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+ if (distance <= maxDistance) {
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+ float edgeStrength = 1.0 - (distance / maxDistance);
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+ edgeDetected = max(edgeDetected, edgeStrength);
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+ isEdge = true;
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+ }
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}
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}
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}
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