source/blender/draw/engines/gpencil/shaders/fx/gpencil_fx_flip_frag.glsl


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out vec4 FragColor;

uniform sampler2D strokeColor;
uniform sampler2D strokeDepth;
uniform vec2 wsize;
uniform int flipmode;

void main()
{
  vec2 mode = vec2(0, 0);
  /* horz. */
  if (flipmode >= 110) {
    mode[0] = 1;
  }
  /* vert. */
  if ((flipmode == 101) || (flipmode == 111)) {
    mode[1] = 1;
  }

  vec2 uv = vec2(gl_FragCoord.xy);
  float stroke_depth;
  vec4 outcolor;

  if (mode[0] > 0) {
    uv.x = wsize.x - uv.x;
  }
  if (mode[1] > 0) {
    uv.y = wsize.y - uv.y;
  }

  ivec2 iuv = ivec2(uv.x, uv.y);
  stroke_depth = texelFetch(strokeDepth, iuv, 0).r;
  outcolor = texelFetch(strokeColor, iuv, 0);

  gl_FragDepth = stroke_depth;
  FragColor = outcolor;
}