#version 120
#extension GL_EXT_gpu_shader4 : enable
#define TAA
varying vec2 texcoord;

flat varying vec3 WsunVec;
flat varying vec3 ambientUp;
flat varying vec3 ambientLeft;
flat varying vec3 ambientRight;
flat varying vec3 ambientB;
flat varying vec3 ambientF;
flat varying vec3 ambientDown;
flat varying vec3 avgAmbient;
flat varying vec4 lightCol;
flat varying float tempOffsets;
flat varying vec2 TAA_Offset;
flat varying vec3 zMults;

uniform sampler2D colortex4;

uniform float far;
uniform float near;
uniform mat4 gbufferModelViewInverse;
uniform vec3 sunPosition;
uniform float rainStrength;
uniform float sunElevation;
uniform int frameCounter;

const vec2[8] offsets = vec2[8](vec2(1./8.,-3./8.),
							vec2(-1.,3.)/8.,
							vec2(5.0,1.)/8.,
							vec2(-3,-5.)/8.,
							vec2(-5.,5.)/8.,
							vec2(-7.,-1.)/8.,
							vec2(3,7.)/8.,
							vec2(7.,-7.)/8.);


#include "/lib/util.glsl"

void main() {
	gl_Position = ftransform();
	texcoord = gl_MultiTexCoord0.xy;

	tempOffsets = HaltonSeq2(frameCounter%10000);
	TAA_Offset = offsets[frameCounter%8];
	#ifndef TAA
	TAA_Offset = vec2(0.0);
	#endif

	vec3 sc = texelFetch2D(colortex4,ivec2(6,37),0).rgb;
	ambientUp = texelFetch2D(colortex4,ivec2(0,37),0).rgb;
	ambientDown = texelFetch2D(colortex4,ivec2(1,37),0).rgb;
	ambientLeft = texelFetch2D(colortex4,ivec2(2,37),0).rgb;
	ambientRight = texelFetch2D(colortex4,ivec2(3,37),0).rgb;
	ambientB = texelFetch2D(colortex4,ivec2(4,37),0).rgb;
	ambientF = texelFetch2D(colortex4,ivec2(5,37),0).rgb;

	avgAmbient = texelFetch2D(colortex4,ivec2(11,37),0).rgb;
	
	lightCol.a = float(sunElevation > 1e-5)*2-1.;
	lightCol.rgb = sc;

	WsunVec = lightCol.a*normalize(mat3(gbufferModelViewInverse) *sunPosition);
	zMults = vec3((far * near)*2.0,far+near,far-near);


}