#version 450 core

//! type fragment

#define FXAA_PC 1
#define FXAA_GLSL_130 1
#define FXAA_FAST_PIXEL_OFFSET 1
#define FXAA_GATHER4_ALPHA 1
#define FXAA_QUALITY__PRESET 39

//! include fxaa-3.11.glsl

layout( location = 0 ) uniform sampler2D u_Input;
layout( location = 1 ) uniform vec4 u_Viewport;
layout( location = 2 ) uniform vec3 u_Parameters;

#define uSPQuality (u_Parameters.x)
#define uEdgeThreshold (u_Parameters.y)
#define uEdgeThresholdMin (u_Parameters.z)

layout( location = 0 ) out vec4 o_Color;

void main( void )
{
	vec2 coords = gl_FragCoord.xy - u_Viewport.xy;
	o_Color = FxaaPixelShader(
		( coords / u_Viewport.zw ) ,	// pos (vec2)
		vec4( 0 ) ,		// unused (vec4)
		u_Input ,		// input texture
		u_Input ,		// (unused) input texture
		u_Input ,		// (unused) input texture
		vec2( 1 ) / u_Viewport.zw , // 1/resolution (vec2)
		vec4( 0 ) ,		// unused (vec4)
		vec4( 0 ) ,		// unused (vec4)
		vec4( 0 ) ,		// unused (vec4)
		uSPQuality ,		// sub-pixel quality (float in [0;1])
		uEdgeThreshold ,	// edge threshold (float, [.063;.333], lower = better)
		uEdgeThresholdMin ,	// edge threshold min (float, [0.0312;0.0833],
					//	higher = better)
		0 ,			// unused (float)
		0 ,			// unused (float)
		0 ,			// unused (float)
		vec4( 0 ) );		// unused (vec4)
}