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+// Copyright (c) 2017-2020 Xiamen Yaji Software Co., Ltd.
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+CCEffect %{
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+ techniques:
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+ - passes:
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+ - vert: sprite-vs:vert
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+ frag: sprite-fs:frag
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+ depthStencilState:
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+ depthTest: false
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+ depthWrite: false
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+ blendState:
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+ targets:
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+ - blend: true
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+ blendSrc: src_alpha
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+ blendDst: one_minus_src_alpha
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+ blendDstAlpha: one_minus_src_alpha
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+ rasterizerState:
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+ cullMode: none
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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: 2.0 }
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+ alphaThreshold: { value: 0.5 }
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+}%
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+
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+CCProgram sprite-vs %{
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+ precision highp float;
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+ #include <builtin/uniforms/cc-global>
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+ #if USE_LOCAL
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+ #include <builtin/uniforms/cc-local>
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+ #endif
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+ #if SAMPLE_FROM_RT
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+ #include <common/common-define>
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+ #endif
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+ in vec3 a_position;
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+ in vec2 a_texCoord;
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+ in vec4 a_color;
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+
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+ out vec4 color;
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+ out vec2 uv0;
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+
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+ vec4 vert () {
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+ vec4 pos = vec4(a_position, 1);
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+
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+ #if USE_LOCAL
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+ pos = cc_matWorld * pos;
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+ #endif
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+
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+ #if USE_PIXEL_ALIGNMENT
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+ pos = cc_matView * pos;
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+ pos.xyz = floor(pos.xyz);
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+ pos = cc_matProj * pos;
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+ #else
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+ pos = cc_matViewProj * pos;
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+ #endif
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+
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+ uv0 = a_texCoord;
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+ #if SAMPLE_FROM_RT
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+ CC_HANDLE_RT_SAMPLE_FLIP(uv0);
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+ #endif
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+ color = a_color;
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+
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+ return pos;
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+ }
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+}%
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+
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+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 10.0 // 最大边缘宽度（可根据需求调整）
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+ in vec4 color;
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+
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+ #if USE_TEXTURE
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+ in vec2 uv0;
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+ #pragma builtin(local)
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+ layout(set = 2, binding = 12) uniform sampler2D cc_spriteTexture;
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+ #endif
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+
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+ uniform EdgeUniforms {
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+ vec4 edgeColor;
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+ vec2 textureSize;
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+ float edgeWidth;
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+ };
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+
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+ vec4 frag () {
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+ vec4 o = vec4(1, 1, 1, 1);
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+
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+ #if USE_TEXTURE
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+ o *= CCSampleWithAlphaSeparated(cc_spriteTexture, uv0);
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+
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+ // Edge detection based on alpha channel
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+ vec2 texelSize = 1.0 / textureSize;
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+ float currentAlpha = o.a;
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+
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+ // Sample surrounding pixels to detect edge
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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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+ }
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+ }
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+ }
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+ }
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+ }
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+
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+ // Apply edge effect
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+ if (edgeDetected > 0.0) {
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+ o.rgb = mix(o.rgb, edgeColor.rgb, edgeDetected * edgeColor.a);
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+ }
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+
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+ #if IS_GRAY
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+ float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;
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+ o.r = o.g = o.b = gray;
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+ #endif
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+ #endif
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+
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+ o *= color;
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+ ALPHA_TEST(o);
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+ return o;
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+ }
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+}%
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