#include "/lib/settings.glsl"
#include "/lib/res_params.glsl"

/*
!! DO NOT REMOVE !!
This code is from Chocapic13' shaders
Read the terms of modification and sharing before changing something below please !
!! DO NOT REMOVE !!
*/

varying vec4 lmtexcoord;
varying vec4 color;

#ifdef OVERWORLD_SHADER
	flat varying vec3 averageSkyCol_Clouds;
	flat varying vec4 lightCol;
	flat varying vec3 WsunVec;
	uniform sampler2D colortex4;
#endif

uniform vec3 sunPosition;
uniform float sunElevation;

uniform vec2 texelSize;
uniform int framemod8;

uniform mat4 gbufferModelViewInverse;
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.);
							
//////////////////////////////VOID MAIN//////////////////////////////
//////////////////////////////VOID MAIN//////////////////////////////
//////////////////////////////VOID MAIN//////////////////////////////
//////////////////////////////VOID MAIN//////////////////////////////
//////////////////////////////VOID MAIN//////////////////////////////

void main() {
	gl_Position = ftransform();

	lmtexcoord.xy = (gl_MultiTexCoord0).xy;
	vec2 lmcoord = gl_MultiTexCoord1.xy / 255.0; // is this even correct? lol'
	lmtexcoord.zw = lmcoord;

	color = gl_Color;
	#ifdef LINES
		color.a = 1.0;
	#endif
	#ifdef OVERWORLD_SHADER
		lightCol.rgb = texelFetch2D(colortex4,ivec2(6,37),0).rgb;
		lightCol.a = float(sunElevation > 1e-5)*2.0 - 1.0;
	
		averageSkyCol_Clouds = texelFetch2D(colortex4,ivec2(0,37),0).rgb;
	
		WsunVec = lightCol.a * normalize(mat3(gbufferModelViewInverse) * sunPosition);
	#endif
	#ifdef TAA_UPSCALING
		gl_Position.xy = gl_Position.xy * RENDER_SCALE + RENDER_SCALE * gl_Position.w - gl_Position.w;
	#endif
	#ifdef TAA
		gl_Position.xy += offsets[framemod8] * gl_Position.w*texelSize;
	#endif
}