//! Input image.
uniform sampler2D uInputTexture;

//! Ray tracing depth image.
uniform sampler2D uDepthTexture;

//! Gamma correction flag.
uniform int uApplyGamma;

//! Output pixel color.
out vec4 OutColor;

void main (void)
{
  vec4 aColor = texelFetch (uInputTexture, ivec2 (gl_FragCoord.xy), 0);

  float aDepth = texelFetch (uDepthTexture, ivec2 (gl_FragCoord.xy), 0).r;
  gl_FragDepth = aDepth;

  if (uApplyGamma == 1)
  {
    // apply gamma correction (we use gamma = 2)
    OutColor = vec4 (sqrt (aColor.rgb), aColor.a);
  }
  else
  {
    OutColor = aColor;
  }
}