rj-action-library/Runtime/Shading/Shaders/PostProcessing/Overlays.gdshader

shader_type canvas_item;

#include "res://addons/rokojori_action_library/Runtime/Shading/Library/Colors.gdshaderinc"
#include "res://addons/rokojori_action_library/Runtime/Shading/Library/Math.gdshaderinc"

uniform sampler2D screenTexture:
  hint_screen_texture,
  repeat_disable,
  filter_linear_mipmap;


uniform sampler2D overlay;
uniform float effectStrength: hint_range(0,1) = 1;


void fragment()
{
  vec4 rgb = texture( screenTexture, UV );
  vec4 originalRGB = rgb;

  vec4 overlayColor = texture( overlay, UV );
  vec4 additiveOverlayColor   = overlayColor + rgb;
  vec4 multipliedOverlayColor = overlayColor * rgb;

  float overlayBlendType = length( overlayColor.rgb );
  vec4 mixed = mix3_v4( multipliedOverlayColor, rgb, additiveOverlayColor, overlayBlendType );

  rgb = mixed;
  COLOR = mix( originalRGB, mixed, effectStrength );
}