wgpu/tests/out/shadow.msl

#include <metal_stdlib>
#include <simd/simd.h>

constexpr constant unsigned c_max_lights = 10u;
struct Globals {
    metal::uint4 num_lights;
};
struct Light {
    metal::float4x4 proj;
    metal::float4 pos;
    metal::float4 color;
};
typedef Light type3[1];
struct Lights {
    type3 data;
};
constant metal::float3 c_ambient = {0.05, 0.05, 0.05};

float fetch_shadow(
    metal::uint light_id,
    metal::float4 homogeneous_coords,
    metal::depth2d_array<float, metal::access::sample> t_shadow,
    metal::sampler sampler_shadow
) {
    if (homogeneous_coords.w <= 0.0) {
        return 1.0;
    }
    float _e28 = t_shadow.sample_compare(sampler_shadow, ((metal::float2(homogeneous_coords.x, homogeneous_coords.y) * metal::float2(0.5, -0.5)) / float2(homogeneous_coords.w)) + metal::float2(0.5, 0.5), static_cast<int>(light_id), homogeneous_coords.z / homogeneous_coords.w);
    return _e28;
}

struct fs_mainInput {
    metal::float3 raw_normal [[user(loc0), center_perspective]];
    metal::float4 position [[user(loc1), center_perspective]];
};
struct fs_mainOutput {
    metal::float4 member [[color(0)]];
};
fragment fs_mainOutput fs_main(
  fs_mainInput varyings [[stage_in]]
, constant Globals& u_globals [[user(fake0)]]
, constant Lights& s_lights [[user(fake0)]]
, metal::depth2d_array<float, metal::access::sample> t_shadow [[user(fake0)]]
, metal::sampler sampler_shadow [[user(fake0)]]
) {
    const auto raw_normal = varyings.raw_normal;
    const auto position = varyings.position;
    metal::float3 color1 = c_ambient;
    metal::uint i = 0u;
    bool loop_init = true;
    while(true) {
        if (!loop_init) {
            i = i + 1u;
        }
        loop_init = false;
        if (i >= metal::min(u_globals.num_lights.x, c_max_lights)) {
            break;
        }
        Light _e21 = s_lights.data[i];
        float _e25 = fetch_shadow(i, _e21.proj * position, t_shadow, sampler_shadow);
        color1 = color1 + ((_e25 * metal::max(0.0, metal::dot(metal::normalize(raw_normal), metal::normalize(metal::float3(_e21.pos.x, _e21.pos.y, _e21.pos.z) - metal::float3(position.x, position.y, position.z))))) * metal::float3(_e21.color.x, _e21.color.y, _e21.color.z));
    }
    return fs_mainOutput { metal::float4(color1, 1.0) };
}