out vec4 FragColor;

uniform sampler2D uTexGarbage;
uniform sampler2D uTexGradients;

in vec4 aColour;
in vec2 aUv;
in vec3 aNorm;
in vec3 aCo;

void main()
{
   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );
   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;
   vec3 qnorm = floor(aNorm*4.0+modnorm) * 0.25;

   vec2 dir = normalize(qnorm.xz);
   vec2 uvdiffuse = aCo.xz * 0.02;
   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;

   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );
   float amtgrass = step(qnorm.y,0.6);
   vec2 uvgradients = vec2( rgarbage.a, -amtgrass*0.125 ) + aUv;
   vec3 diffuse = texture( uTexGradients, uvgradients ).rgb;
   
   vec3 shadow = pow(vec3(0.014,0.034,0.084),vec3(1.0/3.2));
   float light1 = 1.0-(dot( vec3(0.95,0.0,-0.3), qnorm )*0.5+0.5);

   FragColor = vec4(diffuse*(1.0-light1)+diffuse*shadow*light1, 1.0);
}