#version 450
#extension GL_GOOGLE_include_directive : require
#extension GL_EXT_nonuniform_qualifier : enable

#include "bindless.glsl"

layout(location = 0) in vec2 uv;
layout(location = 0) out vec4 outColor;

layout(push_constant) uniform SkyboxPC {
    mat4 invViewProj;
    vec4 skyboxRot[3];
    vec3 cameraPos;
    uint skyboxTextureId;
} pcs;

void main()
{
    vec2 ndcXY = uv * 2.0 - 1.0;
    vec4 ndc = vec4(ndcXY, 1.0, 1.0);

    vec4 world = pcs.invViewProj * ndc;
    vec3 worldPos = world.xyz / world.w;

    vec3 dir = normalize(worldPos - pcs.cameraPos);
    dir.y *= -1.0;

    mat3 skyboxRot = mat3(
    pcs.skyboxRot[0].xyz,
    pcs.skyboxRot[1].xyz,
    pcs.skyboxRot[2].xyz
    );
    dir = skyboxRot * dir;

    outColor = sampleTextureCubeLinear(pcs.skyboxTextureId, dir);
}