#version 450
#extension GL_GOOGLE_include_directive : require
#include "bindless.glsl"


layout(location = 0) in vec3 localPos;

// Input equirectangular HDR texture

layout(location = 0) out vec4 outColor;

const float PI = 3.14159265359;

layout(push_constant) uniform PushConstants {
    mat4 view;
    mat4 proj;
    uint skyboxId;
} pcs;

vec2 sampleSphericalMap(vec3 v) {
    // Convert direction to spherical coordinates
    vec2 uv = vec2(atan(v.z, v.x), asin(v.y));
    uv /= vec2(2.0 * PI, PI);
    uv += 0.5;
    return uv;
}

void main() {
    // Normalize direction vector
    vec3 dir = normalize(localPos);

    // Sample from equirectangular texture
    vec2 uv = sampleSphericalMap(dir);
    vec4 color = sampleTexture2DNearest(pcs.skyboxId, uv);


    outColor = color;
}