#shader vertex
#version 150 core

in vec4 position;
in vec2 texcoord;

uniform mat4 u_mvp;

struct v2f {
    vec2 texcoord;
};

out v2f _v2f;

void main()
{
    _v2f.texcoord = texcoord;
    gl_Position = u_mvp * position;
}

#shader fragment
#version 150 core

struct v2f {
    vec2 texcoord;
};

in v2f _v2f;

struct material {
    sampler2D mainTex;
    vec2 offset;
    vec4 tint;
    float alpha;
};

uniform material u_mat;

out vec4 outColor;

void main()
{
    outColor = texture(u_mat.mainTex, _v2f.texcoord - u_mat.offset) * u_mat.tint * vec4(1, 1, 1, u_mat.alpha);
}