perovskite_client 0.3.2

Multiplayer voxel game written in Rust - Game client
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#version 460
#define SKIP_MASK 0u
#include "raytracer_frag_common.glsl"

// layout (set = 1, binding = 3, rgba8) uniform restrict readonly image2D
// deferred_specular_color;
layout(set = 1, binding = 4, rgba32ui) uniform
    restrict readonly uimage2D deferred_specular_ray_dir;
layout(location = 0) out vec4 specular_result;

void main() {
  specular_result = vec4(0);
  uvec4 spec_ray_dir =
      imageLoad(deferred_specular_ray_dir, ivec2(gl_FragCoord.xy));
  uint spec_block = spec_ray_dir.a;
  if (spec_block == 0) {
    return;
  }
  vec3 spec_dir_len = uintBitsToFloat(spec_ray_dir.rgb);
  vec3 spec_dir = normalize(spec_dir_len);
  vec3 g0 = normalize(facedir_world_in) * length(spec_dir_len) + fine_pos -
            0.001 * (spec_dir);

  vec2 t_min_max = t_range(g0, spec_dir);

  if (t_min_max.x > t_min_max.y) {
    return;
  }
  vec3 g1 = g0 + (spec_dir * t_min_max.y);
  specular_result = vec4(0);
  for (int i = 0; i < 3; i++) {
    HitInfo info = {
        ivec3(0), vec3(0), vec3(0), spec_block, 0,
    };
    if (!traverse_space(g0, g1, info)) {
      break;
    }
    // traverse_space will fill info w/ valid data iff it returns true
    uint idx = info.block_id >> 12;
    if (idx >= max_cube_info_idx) {
      // CPU-side code should fix this and we should never enter this branch
      specular_result = vec4(1.0, 0.0, 0.0, 1.0);
      break;
    }
    if ((cube_info[idx].flags & 1) != 0) {
      vec4 sampled = sample_simple(info, idx, false).diffuse;
      float alpha_contrib = sampled.a * (1 - specular_result.a);
      specular_result.rgb += alpha_contrib * sampled.rgb;
      specular_result.a += alpha_contrib;
    }
    spec_block = info.block_id;
    vec3 midpoint = (info.start_cc + info.end_cc) / 2;
    g0 = (vec3(info.hit_block) + midpoint) / 32.0;
    if (specular_result.a > 0.75) {
      break;
    }
  }

  if (specular_result.a < 0.99) {
    specular_result +=
        (1 - specular_result.a) * vec4(sky_rgb(spec_dir, sun_direction), 1.0);
  }
  specular_result.rgb = specular_result.rgb * specular_result.a;
}