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assets/FishSingle/shader/effects/sprite-gray.effect

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+// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.  
+// 灰化特效
+// 原理：
+// r = 0.2126 * r + 0.7152 * g + 0.0722 * b
+// g = 0.2126 * r + 0.7152 * g + 0.0722 * b
+// b = 0.2126 * r + 0.7152 * g + 0.0722 * 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 }
+        # 灰化程度
+        grayLevel: {
+          value: 1.0,
+          editor: {
+            tooltip: "灰化程度",
+            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_GRAY
+  uniform GrayPhoto {
+    // 灰化程度
+    float grayLevel;
+  };
+  #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_GRAY
+    vec4 srcColor = o;
+
+    float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;
+    vec4 grayColor = vec4(gray, gray, gray, o.a);
+
+    o = srcColor + (grayColor - srcColor) * grayLevel;
+    #endif
+    gl_FragColor = o;
+  }
+}%