#version 310 es
precision highp float;
precision highp int;

layout(location = 0) in vec2 v_texCoord;
layout(location = 1) in vec3 v_normal;
layout(binding = 0) uniform sampler2D u_alphaMap;
layout(binding = 1) uniform sampler2D u_tex0;
layout(binding = 2) uniform sampler2D u_tex1;
layout(binding = 3) uniform sampler2D u_tex2;
layout(binding = 4) uniform sampler2D u_tex3;
layout(binding = 5) uniform sampler2D u_lightMap;
layout(std140, binding = 0) uniform fs_ub {
    vec3 u_color;
    int u_has_alpha;
    int u_has_light_map;
    float u_detailSize[4];
    vec3 u_lightDir;
};

layout(location = 0) out vec4 FragColor;

void main()
{
vec4 lightColor;
if(u_has_light_map<=0)
{
    lightColor = vec4(1.0,1.0,1.0,1.0);
}else
{
    lightColor = texture(u_lightMap,v_texCoord);
}
float lightFactor = dot(-u_lightDir,v_normal);
if(u_has_alpha<=0)
{
    FragColor = texture(u_tex0, v_texCoord)*lightColor*lightFactor;
}else
{
    vec4 blendFactor =texture(u_alphaMap,v_texCoord);
    vec4 color = vec4(0.0,0.0,0.0,0.0);
    color = texture(u_tex0, v_texCoord*u_detailSize[0])*blendFactor.r +
    texture(u_tex1, v_texCoord*u_detailSize[1])*blendFactor.g + texture(u_tex2, v_texCoord*u_detailSize[2])*blendFactor.b
        + texture(u_tex3, v_texCoord*u_detailSize[3])*(1.0 - blendFactor.a);
    FragColor = vec4(color.rgb*lightColor.rgb*lightFactor, 1.0);
}
}