着色器

案例

高斯模糊-适用于3.8.6

effect（注意将材质的"USE_TEXTURE"设为true）

// Eazax-CCC 高斯模糊（3.8.6 改写版）

CCEffect %{
  techniques:
  - passes:
    - vert: sprite-vs:vert
      frag: blur2-fs:frag
      depthStencilState:
        depthTest: false
        depthWrite: false
      blendState:
        targets:
        - blend: true
          blendSrc: src_alpha
          blendDst: one_minus_src_alpha
          blendDstAlpha: one_minus_src_alpha
      rasterizerState:
        cullMode: none
      properties:
        size: { value: [500.0, 500.0], editor: { tooltip: '纹理/节点像素尺寸' } }
}%


CCProgram sprite-vs %{
  precision highp float;
  #include <builtin/uniforms/cc-global>
  #if USE_LOCAL
    #include <builtin/uniforms/cc-local>
  #endif
  #if SAMPLE_FROM_RT
    #include <common/common-define>
  #endif

  in vec3 a_position;
  in vec2 a_texCoord;
  in vec4 a_color;

  out vec4 color;
  out vec2 uv0;

  vec4 vert () {
    vec4 pos = vec4(a_position, 1.0);

    #if USE_LOCAL
      pos = cc_matWorld * pos;
    #endif

    #if USE_PIXEL_ALIGNMENT
      pos = cc_matView * pos;
      pos.xyz = floor(pos.xyz);
      pos = cc_matProj * pos;
    #else
      pos = cc_matViewProj * pos;
    #endif

    uv0 = a_texCoord;
    #if SAMPLE_FROM_RT
      CC_HANDLE_RT_SAMPLE_FLIP(uv0);
    #endif
    color = a_color;

    return pos;
  }
}%


CCProgram blur2-fs %{
  precision highp float;

  #include <builtin/internal/embedded-alpha>
  #include <builtin/internal/alpha-test>

  in vec4 color;   // 顶点色（含 alpha）

  // 与项目中其他 effect 一致的纹理采样器定义
  #if USE_TEXTURE
    in vec2 uv0;
    #pragma builtin(local)
    layout(set = 2, binding = 11) uniform sampler2D cc_spriteTexture;
  #endif

  // 属性常量缓冲
  uniform Constant {
    vec2 size;    // 纹理/节点像素尺寸
  };

  // 模糊半径（编译期常量）。注意：半径过大将极大影响性能
  const int RADIUS = 20; // 对应原版 20.0

  // 计算加权盒式/近似高斯模糊（权重按距离线性衰减）
  vec4 getBlurColor (vec2 pos) {
    vec4 accum = vec4(0.0);
    float sum = 0.0;
    #if USE_TEXTURE
      for (int r = -RADIUS; r <= RADIUS; ++r) {
        for (int c = -RADIUS; c <= RADIUS; ++c) {
          vec2 target = pos + vec2(float(r) / max(size.x, 1.0), float(c) / max(size.y, 1.0));
          float wr = float(RADIUS) - abs(float(r));
          float wc = float(RADIUS) - abs(float(c));
          float w = max(wr, 0.0) * max(wc, 0.0);
          accum += CCSampleWithAlphaSeparated(cc_spriteTexture, target) * w;
          sum += w;
        }
      }
      if (sum > 0.0) {
        accum /= sum;
      }
    #endif
    return accum;
  }

  vec4 frag () {
    vec4 outColor = vec4(1.0);
    #if USE_TEXTURE
      vec4 blurred = getBlurColor(uv0);
      outColor = blurred;
    #endif
    outColor *= color; // 应用顶点色与透明度
    ALPHA_TEST(outColor);
    return outColor;
  }
}%