[vertex]


layout(location=0) in highp vec4 vertex_attrib;
layout(location=4) in vec2 uv_in;

out vec2 uv_interp;


void main() {

	uv_interp = uv_in;
	gl_Position = vertex_attrib;
}

[fragment]


in vec2 uv_interp;
uniform sampler2D source_color; //texunit:0

#ifdef SSAO_MERGE
uniform sampler2D source_ssao; //texunit:1
#endif

uniform float lod;
uniform vec2 pixel_size;


layout(location = 0) out vec4 frag_color;

#ifdef SSAO_MERGE

uniform vec4 ssao_color;

#endif

#if defined (GLOW_GAUSSIAN_HORIZONTAL) || defined(GLOW_GAUSSIAN_VERTICAL)

uniform float glow_strength;

#endif


#ifdef GLOW_FIRST_PASS

uniform float exposure;
uniform float white;

#ifdef GLOW_USE_AUTO_EXPOSURE

uniform highp sampler2D source_auto_exposure; //texunit:1
uniform highp float auto_exposure_grey;

#endif

uniform float glow_bloom;
uniform float glow_hdr_treshold;
uniform float glow_hdr_scale;

#endif

void main() {



#ifdef GAUSSIAN_HORIZONTAL
	vec4 color =textureLod( source_color,  uv_interp+vec2( 0.0, 0.0)*pixel_size,lod )*0.38774;
	color+=textureLod( source_color,  uv_interp+vec2( 1.0, 0.0)*pixel_size,lod )*0.24477;
	color+=textureLod( source_color,  uv_interp+vec2( 2.0, 0.0)*pixel_size,lod )*0.06136;
	color+=textureLod( source_color,  uv_interp+vec2(-1.0, 0.0)*pixel_size,lod )*0.24477;
	color+=textureLod( source_color,  uv_interp+vec2(-2.0, 0.0)*pixel_size,lod )*0.06136;
	frag_color = color;
#endif

#ifdef GAUSSIAN_VERTICAL
	vec4 color =textureLod( source_color,  uv_interp+vec2( 0.0, 0.0)*pixel_size,lod )*0.38774;
	color+=textureLod( source_color,  uv_interp+vec2( 0.0, 1.0)*pixel_size,lod )*0.24477;
	color+=textureLod( source_color,  uv_interp+vec2( 0.0, 2.0)*pixel_size,lod )*0.06136;
	color+=textureLod( source_color,  uv_interp+vec2( 0.0,-1.0)*pixel_size,lod )*0.24477;
	color+=textureLod( source_color,  uv_interp+vec2( 0.0,-2.0)*pixel_size,lod )*0.06136;
	frag_color = color;
#endif



#ifdef GLOW_GAUSSIAN_HORIZONTAL
	vec4 color =textureLod( source_color,  uv_interp+vec2( 0.0, 0.0)*pixel_size,lod )*0.174938;
	color+=textureLod( source_color,  uv_interp+vec2( 1.0, 0.0)*pixel_size,lod )*0.165569;
	color+=textureLod( source_color,  uv_interp+vec2( 2.0, 0.0)*pixel_size,lod )*0.140367;
	color+=textureLod( source_color,  uv_interp+vec2( 3.0, 0.0)*pixel_size,lod )*0.106595;
	color+=textureLod( source_color,  uv_interp+vec2(-1.0, 0.0)*pixel_size,lod )*0.165569;
	color+=textureLod( source_color,  uv_interp+vec2(-2.0, 0.0)*pixel_size,lod )*0.140367;
	color+=textureLod( source_color,  uv_interp+vec2(-3.0, 0.0)*pixel_size,lod )*0.165569;
	color*=glow_strength;
	frag_color = color;
#endif

#ifdef GLOW_GAUSSIAN_VERTICAL
	vec4 color =textureLod( source_color,  uv_interp+vec2(0.0, 0.0)*pixel_size,lod )*0.174938;
	color+=textureLod( source_color,  uv_interp+vec2(0.0, 1.0)*pixel_size,lod )*0.165569;
	color+=textureLod( source_color,  uv_interp+vec2(0.0, 2.0)*pixel_size,lod )*0.140367;
	color+=textureLod( source_color,  uv_interp+vec2(0.0, 3.0)*pixel_size,lod )*0.106595;
	color+=textureLod( source_color,  uv_interp+vec2(0.0,-1.0)*pixel_size,lod )*0.165569;
	color+=textureLod( source_color,  uv_interp+vec2(0.0,-2.0)*pixel_size,lod )*0.140367;
	color+=textureLod( source_color,  uv_interp+vec2(0.0,-3.0)*pixel_size,lod )*0.165569;
	color*=glow_strength;
	frag_color = color;
#endif

#ifdef GLOW_FIRST_PASS

#ifdef GLOW_USE_AUTO_EXPOSURE

	frag_color/=texelFetch(source_auto_exposure,ivec2(0,0),0).r/auto_exposure_grey;
#endif
	frag_color*=exposure;

	float luminance = max(frag_color.r,max(frag_color.g,frag_color.b));
	float feedback = max( smoothstep(glow_hdr_treshold,glow_hdr_treshold+glow_hdr_scale,luminance), glow_bloom );

	frag_color *= feedback;

#endif


#ifdef SIMPLE_COPY
	vec4 color =textureLod( source_color,  uv_interp,0.0);
	frag_color = color;
#endif

#ifdef SSAO_MERGE

	vec4 color =textureLod( source_color,  uv_interp,0.0);
	float ssao =textureLod( source_ssao,  uv_interp,0.0).r;

	frag_color = vec4( mix(color.rgb,color.rgb*mix(ssao_color.rgb,vec3(1.0),ssao),color.a), 1.0 );

#endif
}