/** 
 * @file fullbrightF.glsl
 *
 * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
 * $License$
 */

#extension GL_ARB_texture_rectangle : enable

uniform sampler2D diffuseMap;
uniform sampler2DShadow shadowMap0;
uniform sampler2DShadow shadowMap1;
uniform sampler2DShadow shadowMap2;
uniform sampler2DShadow shadowMap3;
uniform sampler2D noiseMap;
uniform sampler2DRect positionMap;

uniform mat4 shadow_matrix[4];
uniform vec4 shadow_clip;
uniform vec2 screen_res;

vec3 fullbrightAtmosTransport(vec3 light);
vec3 fullbrightScaleSoftClip(vec3 light);

varying vec3 vary_ambient;
varying vec3 vary_directional;
varying vec4 vary_position;
varying vec3 vary_normal;
varying vec3 vary_fragcoord;

uniform float alpha_soften;

void main() 
{
	vec2 frag = vary_fragcoord.xy/vary_fragcoord.z*0.5+0.5;
	frag *= screen_res;
	
	vec3 samp_pos = texture2DRect(positionMap, frag).xyz;
	
	float shadow = 1.0;
	vec4 pos = vary_position;

	vec4 color = texture2D(diffuseMap, gl_TexCoord[0].xy)*gl_Color;
	
	color.rgb = fullbrightAtmosTransport(color.rgb);

	color.rgb = fullbrightScaleSoftClip(color.rgb);

	if (samp_pos.z != 0.0)
	{
		float dist_factor = alpha_soften;
		float a = gl_Color.a;
		a *= a;
		dist_factor *= 1.0/(1.0-a);
		color.a *= min((pos.z-samp_pos.z)*dist_factor, 1.0);
	}

	//gl_FragColor = gl_Color;
	gl_FragColor = color;
	//gl_FragColor = vec4(1,0,1,1);
	
}