#version 300 es
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec3 aNormal;
layout(location = 2) in vec4 aInstRot;
layout(location = 3) in vec3 aInstPos;
layout(location = 4) in vec3 aInstScale;
layout(location = 5) in vec4 aInstColor;
layout(location = 6) in vec4 aInstParams;   // x = emissive, y = receiveShadow, z = fresnel, w = custom0 (unread here)
#include "_graphics_uniforms.glsl"
out highp vec3 vNormal;
out highp vec3 vWorldPos;
out vec4 vColor;
out float vEmissive;
out float vReceiveShadow;
out float vFresnel;
vec3 quatRotate(vec4 q, vec3 v) {
    return v + 2.0 * cross(q.xyz, cross(q.xyz, v) + q.w * v);
}
void main() {
    vec3 world = quatRotate(aInstRot, aPos * aInstScale) + aInstPos;
    // inverse-transpose of a diagonal scale is 1/scale — exact for axis-aligned box normals
    vNormal = quatRotate(aInstRot, normalize(aNormal / aInstScale));
    gl_Position = u_viewProjection * vec4(world, 1.0);
    vWorldPos = world;
    vColor = aInstColor;
    vEmissive = aInstParams.x;
    vReceiveShadow = aInstParams.y;
    vFresnel = aInstParams.z;
}