@group(0) @binding(0) var<uniform> view_proj_matrix: mat4x4<f32>;


@group(1) @binding(0) var texture_sampler: sampler;
@group(1) @binding(1) var model_texture: texture_2d<f32>;
@group(1) @binding(2) var<uniform> model_matrix: mat4x4<f32>;
@group(1) @binding(3) var<uniform> model_color: vec3<f32>;

struct VertexInput {
    @location(0) position: vec3<f32>,
    @location(1) uv: vec2<f32>,
};

struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) color: vec4<f32>,
    @location(1) frag_uv: vec2<f32>,
};

struct FragmentOutput {
    @location(0) pixel_color: vec4<f32>
};

@vertex fn vertex_main(in: VertexInput) -> VertexOutput {
    var out: VertexOutput;
    let mvp = model_matrix * view_proj_matrix;
    out.position = vec4<f32>(in.position, 1.0) * mvp;
    out.color    = vec4<f32>(model_color, 1.0);
    out.frag_uv  = in.uv;
    return out;
}

@fragment fn frag_main(in: VertexOutput) -> FragmentOutput {
    var out: FragmentOutput;
    let texture_color = textureSample(model_texture, texture_sampler, in.frag_uv);
    out.pixel_color = texture_color * in.color;
    return out;
}