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assets/FishSingle/shader/effects/sprite-old-photo.effect

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+// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.  
+// 老照片特效
+// 原理：
+// r = 0.393 * r + 0.769 * g + 0.189 * b; 
+// g = 0.349 * r + 0.686 * g + 0.168 * b; 
+// b = 0.272 * r + 0.534 * g + 0.131 * b;
+
+CCEffect %{
+  techniques:
+  - passes:
+    - vert: unlit-vs
+      frag: unlit-fs
+      blendState:
+        targets:
+        - blend: true
+      rasterizerState:
+        cullMode: none
+      properties:
+        mainTexture: { value: white }
+        alphaThreshold: { value: 0.5 }
+        # 老化程度
+        oldLevel: {
+          value: 1.0,
+          editor: {
+            tooltip: "老化程度",
+            range: [0.0, 1.0]
+          }
+        }
+}%
+
+
+CCProgram unlit-vs %{
+  precision highp float;
+
+  #include <builtin/uniforms/cc-global>
+  #include <builtin/uniforms/cc-local>
+
+  in vec3 a_position;
+  in vec4 a_color;
+  out vec4 v_color;
+
+  #if USE_TEXTURE
+  in vec2 a_uv0;
+  out vec2 v_uv0;
+  #endif
+
+  void main () {
+    vec4 pos = vec4(a_position, 1);
+
+    #if CC_USE_MODEL
+    pos = cc_matViewProj * cc_matWorld * pos;
+    #else
+    pos = cc_matViewProj * pos;
+    #endif
+
+    #if USE_TEXTURE
+    v_uv0 = a_uv0;
+    #endif
+
+    v_color = a_color;
+
+    gl_Position = pos;
+  }
+}%
+
+
+CCProgram unlit-fs %{
+  precision highp float;
+  
+  #include <builtin/internal/alpha-test>
+
+  in vec4 v_color;
+
+  #if USE_TEXTURE
+  in vec2 v_uv0;
+  uniform sampler2D mainTexture;
+  #endif
+
+  #if USE_OLD_PHOTO
+  uniform OldPhoto {
+    // 老化程度
+    float oldLevel;
+  };
+
+  /**
+   * 获取老化颜色
+   * 
+   * @param color 原始颜色 
+   *
+   * @return 老化后的颜色
+   */
+  vec4 getOldPhotoColor(vec4 color) {
+    float r = 0.393 * color.r + 0.769 * color.g + 0.189 * color.b; 
+    float g = 0.349 * color.r + 0.686 * color.g + 0.168 * color.b; 
+    float b = 0.272 * color.r + 0.534 * color.g + 0.131 * color.b;
+    return vec4(r, g, b, color.a);
+  }
+  #endif
+
+  void main () {
+    vec4 o = vec4(1, 1, 1, 1);
+
+    #if USE_TEXTURE
+    o *= texture(mainTexture, v_uv0);
+      #if CC_USE_ALPHA_ATLAS_TEXTURE
+      o.a *= texture2D(mainTexture, v_uv0 + vec2(0, 0.5)).r;
+      #endif
+    #endif
+
+    o *= v_color;
+
+    ALPHA_TEST(o);
+
+    #if USE_OLD_PHOTO
+    vec4 srcColor = o;
+    vec4 oldColor = getOldPhotoColor(srcColor);
+
+    o = srcColor + (oldColor - srcColor) * oldLevel;
+    #endif
+    gl_FragColor = o;
+  }
+}%