// Copyright (c) 2017-2020 Xiamen Yaji Software Co., Ltd.

CCEffect %{
  techniques:
  - passes:
    - vert: vs
      frag: fs-easu
      pass: post-process
      rasterizerState:
        cullMode: none
      depthStencilState:
        depthTest: false
        depthWrite: false
      blendState:
        targets:
        - blend: true
          blendSrc: one
          blendDst: zero
    - vert: vs
      frag: fs-rcas
      pass: post-process
      rasterizerState:
        cullMode: none
      depthStencilState:
        depthTest: false
        depthWrite: false
      blendState:
        targets:
        - blend: true
          blendSrc: one
          blendDst: zero
}%


CCProgram vs %{
  #include <./chunks/vs>
}%

CCProgram ubo %{
    uniform PostUBO {
        vec4 fsrParams;
        vec4 texSize;
    };
    #pragma rate outputResultMap pass
    uniform sampler2D outputResultMap;
}%

CCProgram fs-easu %{
  precision highp float;

  #include <builtin/uniforms/cc-global>
  #include <legacy/output-standard>
  #include <unpack>

  #include <./chunks/fsr>

  in vec2 v_uv;
  #include <ubo>

  vec4 FsrRcasLoadF(vec2 p) {
    vec4 color = texture(outputResultMap, p/texSize.zw);
    // color = CCFragOutput(color);
    return color;
  }
  vec3 FsrEasuCF(vec2 p) {
    vec4 color = texture(outputResultMap, p);
    // color = CCFragOutput(color);
    return color.rgb;
  }

  layout(location = 0) out vec4 fragColor;
  void main () {
    vec3 c;
    vec4 con0, con1, con2, con3;

    // "rendersize" refers to size of source image before upscaling.
    vec2 rendersize = texSize.xy;
    FsrEasuCon(
      con0, con1, con2, con3,
      rendersize, rendersize, texSize.zw
    );
    FsrEasuF(c, gl_FragCoord.xy, con0, con1, con2, con3);
    float alpha = texture(outputResultMap, v_uv).a;
    fragColor = vec4(c.xyz, alpha);
  }

}%


CCProgram fs-rcas %{
  precision highp float;

  #include <builtin/uniforms/cc-global>
  #include <legacy/output-standard>
  #include <unpack>

  #include <./chunks/fsr>

  in vec2 v_uv;
  #include <ubo>

  vec4 FsrRcasLoadF(vec2 p) {
    vec4 color = texture(outputResultMap, p/texSize.zw);
    return color;
  }
  vec3 FsrEasuCF(vec2 p) {
    vec4 color = texture(outputResultMap, p);
    return color.rgb;
  }

  layout(location = 0) out vec4 fragColor;
  void main () {
    // Set up constants
    float con;
    FsrRcasCon(con, fsrParams.x);

    // Perform RCAS pass
    vec3 col = FsrRcasF(gl_FragCoord.xy, con);
    float alpha = texture(outputResultMap, v_uv).a;
    fragColor = vec4(col, alpha);
  }
}%