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


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/* ******************************************************************* */
/* Resolve Shadow pass                                                 */
/* ******************************************************************* */
uniform sampler2D strokeColor;
uniform sampler2D strokeDepth;
uniform sampler2D shadowColor;
uniform sampler2D shadowDepth;

out vec4 FragColor;

void main()
{
  ivec2 uv = ivec2(gl_FragCoord.xy);

  float stroke_depth = texelFetch(strokeDepth, uv.xy, 0).r;
  float shadow_depth = texelFetch(shadowDepth, uv.xy, 0).r;
  vec4 stroke_pixel = texelFetch(strokeColor, uv.xy, 0);
  vec4 shadow_pixel = texelFetch(shadowColor, uv.xy, 0);

  /* copy original pixel */
  vec4 outcolor = stroke_pixel;
  float outdepth = stroke_depth;

  /* if stroke is not on top, copy shadow */
  if ((stroke_pixel.a <= 0.2) && (shadow_pixel.a > 0.0)) {
    outcolor = shadow_pixel;
    outdepth = shadow_depth;
  }

  gl_FragDepth = outdepth;
  FragColor = outcolor;
}