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uniform sampler2D myTexture;
uniform sampler2D normalTexture;
uniform vec4 skyBgColor;
uniform float fogDistance;
varying vec3 vPosition;
varying vec3 viewVec;
void main (void)
{
vec4 col = texture2D(myTexture, vec2(gl_TexCoord[0]));
float alpha = col.a;
vec2 uv = gl_TexCoord[0].st;
vec4 base = texture2D(myTexture, uv);
vec4 final_color = vec4(0.2, 0.2, 0.2, 1.0) * base;
vec3 vVec = normalize(viewVec);
vec3 bump = normalize(texture2D(normalTexture, uv).xyz * 2.0 - 1.0);
vec3 R = reflect(-vVec, bump);
vec3 lVec = normalize(vec3(0.0, -0.4, 0.5));
float diffuse = max(dot(lVec, bump), 0.0);
vec3 color = diffuse * texture2D(myTexture, gl_TexCoord[0].st).rgb;
float specular = pow(clamp(dot(R, lVec), 0.0, 1.0),1.0);
color += vec3(0.2*specular*diffuse);
col = vec4(color.r, color.g, color.b, alpha);
col *= gl_Color;
col = col * col; // SRGB -> Linear
col *= 1.8;
col.r = 1.0 - exp(1.0 - col.r) / exp(1.0);
col.g = 1.0 - exp(1.0 - col.g) / exp(1.0);
col.b = 1.0 - exp(1.0 - col.b) / exp(1.0);
col = sqrt(col); // Linear -> SRGB
if(fogDistance != 0.0){
float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
col = mix(col, skyBgColor, d);
}
gl_FragColor = vec4(col.r, col.g, col.b, alpha);
}
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