#version 450

layout(binding = 0) uniform UniformBufferObject {
    mat4 model;
    mat4 view;
    mat4 proj;
} ubo;

// vertex
layout(location = 0) in vec4 inColor;
layout(location = 1) in vec3 inPosition;
layout(location = 2) in vec3 inNorm;
layout(location = 3) in vec2 inTexCoord;

// instance
layout(location = 4) in mat4 instPosRotScale;
layout(location = 8) in float textureIndex;

// output
layout(location = 0) out vec3 fragColor;
layout(location = 1) out vec3 fragTexCoord;

void main() {
    gl_Position =
        ubo.proj *
        ubo.view *
        ubo.model *
        instPosRotScale *
        vec4(inPosition, 1.0);
    fragColor = inColor;
    fragTexCoord = vec3(inTexCoord, textureIndex);
}