G_Ctx G = Zi;
ThreadLocal G_ThreadLocalCtx G_tl = Zi;

////////////////////////////////////////////////////////////
//~ Bootstrap

void G_BootstrapCommon(void)
{
  G_ArenaHandle gpu_perm = G_PermArena();

  G_CommandListHandle cl = G_PrepareCommandList(G_QueueKind_Direct);
  {
    // Init quad index buffer
    {
      G_ResourceHandle quad_indices = Zi;
      u16 quad_data[6] = { 0, 1, 2, 0, 2, 3 };
      quad_indices = G_PushBuffer(gpu_perm, cl, u16, countof(quad_data));
      G_CopyCpuToBuffer(cl, quad_indices, 0, quad_data, RNGU64(0, sizeof(quad_data)));
      G.quad_indices = G_IdxBuff16(quad_indices);
    }

    // Init blank texture
    {
      G_ResourceHandle blank_tex = G_PushTexture2D(
        gpu_perm, cl,
        G_Format_R8G8B8A8_Unorm,
        VEC2I32(8, 8),
        G_Layout_Common,
        .flags = G_ResourceFlag_ZeroMemory,
        .name = Lit("Blank texture")
      );
      G.blank_tex = G_PushTexture2DRef(gpu_perm, blank_tex);
    }

    // Init noise texture
    {
      G_ResourceHandle noise_tex = Zi;
      String noise_data = DataFromResource(ResourceKeyFromStore(&G_Resources, Lit("noise_128x128x64_16.dat")));
      Vec3I32 noise_dims = VEC3I32(128, 128, 64);
      if (noise_data.len != noise_dims.x * noise_dims.y * noise_dims.z * 2)
      {
        Panic(Lit("Unexpected noise texture size"));
      }
      noise_tex = G_PushTexture3D(
        gpu_perm, cl,
        G_Format_R16_Uint,
        noise_dims,
        G_Layout_Common,
        .name = Lit("Noise texture")
      );
      G_CopyCpuToTexture(
        cl,
        noise_tex, VEC3I32(0, 0, 0),
        noise_data.text, noise_dims,
        RNG3I32(VEC3I32(0, 0, 0), noise_dims)
      );
      G.basic_noise = G_PushTexture3DRef(gpu_perm, noise_tex);
    }

    // Init basic samplers
    for (G_BasicSamplerKind sampler_kind = 0; sampler_kind < countof(G.basic_samplers); ++sampler_kind)
    {
      G_SamplerStateRef sampler = Zi;
      switch (sampler_kind)
      {
        default:
        {
          // Sampler unspecified
          Assert(0);
        } FALLTHROUGH;
        case G_BasicSamplerKind_PointClamp:
        {
          G_Filter filter              = G_Filter_MinMagMipPoint;
          G_AddressMode address_mode   = G_AddressMode_Clamp;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_PointWrap:
        {
          G_Filter filter              = G_Filter_MinMagMipPoint;
          G_AddressMode address_mode   = G_AddressMode_Wrap;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_PointMirror:
        {
          G_Filter filter              = G_Filter_MinMagMipPoint;
          G_AddressMode address_mode   = G_AddressMode_Mirror;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_BilinearClamp:
        {
          G_Filter filter              = G_Filter_MinMagLinearMipPoint;
          G_AddressMode address_mode   = G_AddressMode_Clamp;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_BilinearWrap:
        {
          G_Filter filter              = G_Filter_MinMagLinearMipPoint;
          G_AddressMode address_mode   = G_AddressMode_Wrap;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_BilinearMirror:
        {
          G_Filter filter              = G_Filter_MinMagLinearMipPoint;
          G_AddressMode address_mode   = G_AddressMode_Mirror;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_TrilinearClamp:
        {
          G_Filter filter              = G_Filter_MinMagMipLinear;
          G_AddressMode address_mode   = G_AddressMode_Clamp;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_TrilinearWrap:
        {
          G_Filter filter              = G_Filter_MinMagMipLinear;
          G_AddressMode address_mode   = G_AddressMode_Wrap;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
        case G_BasicSamplerKind_TrilinearMirror:
        {
          G_Filter filter              = G_Filter_MinMagMipLinear;
          G_AddressMode address_mode   = G_AddressMode_Mirror;
          G_ResourceHandle sampler_res = G_PushSampler(gpu_perm, cl, .filter = filter, .x = address_mode, .y = address_mode, .z = address_mode);
          sampler = G_PushSamplerStateRef(gpu_perm, sampler_res);
        } break;
      }
      G.basic_samplers[sampler_kind] = sampler;
    }
  }
  G_CommitCommandList(cl);
  G_QueueSync(G_QueueMask_Direct, G_QueueMask_All);
}

////////////////////////////////////////////////////////////
//~ Utils

//- Arena

G_ArenaHandle G_PermArena(void)
{
  if (G_IsArenaNil(G_tl.gpu_perm))
  {
    G_tl.gpu_perm = G_AcquireArena();
  }
  return G_tl.gpu_perm;
}

//- Push resource from cpu

G_ResourceHandle G_PushBufferFromCpuCopy_(G_ArenaHandle gpu_arena, G_CommandListHandle cl, String src, G_BufferDesc desc)
{
  G_ResourceHandle buffer = G_PushResource(gpu_arena, cl, (G_ResourceDesc) { .kind = G_ResourceKind_Buffer, .buffer = desc });
  G_CopyCpuToBuffer(cl, buffer, 0, src.text, RNGU64(0, src.len));
  return buffer;
}

//- Mip

i32 G_DimsFromMip1D(i32 mip0_dims, i32 mip)
{
  mip = ClampI32(mip, -31, 31);
  i32 result = 0;
  if (mip >= 0)
  {
    result = MaxI32(result >> mip, 1);
  }
  else
  {
    result = MaxI32(result << -mip, 1);
  }
  return result;
}

Vec2I32 G_DimsFromMip2D(Vec2I32 mip0_dims, i32 mip)
{
  mip = ClampI32(mip, -31, 31);
  Vec2I32 result = Zi;
  if (mip >= 0)
  {
    result.x = MaxI32(mip0_dims.x >> mip, 1);
    result.y = MaxI32(mip0_dims.y >> mip, 1);
  }
  else
  {
    result.x = MaxI32(mip0_dims.x << -mip, 1);
    result.y = MaxI32(mip0_dims.y << -mip, 1);
  }
  return result;
}

Vec3I32 G_DimsFromMip3D(Vec3I32 mip0_dims, i32 mip)
{
  mip = ClampI32(mip, -31, 31);
  Vec3I32 result = Zi;
  if (mip >= 0)
  {
    result.x = MaxI32(mip0_dims.x >> mip, 1);
    result.y = MaxI32(mip0_dims.y >> mip, 1);
    result.z = MaxI32(mip0_dims.z >> mip, 1);
  }
  else
  {
    result.x = MaxI32(mip0_dims.x << -mip, 1);
    result.y = MaxI32(mip0_dims.y << -mip, 1);
    result.z = MaxI32(mip0_dims.z << -mip, 1);
  }
  return result;
}

//- Thread count

Vec3I32 G_GroupCountFromThreadCount(ComputeShaderDesc cs, Vec3I32 threads)
{
  return VEC3I32(
    (threads.x + cs.x - 1) / cs.x,
    (threads.y + cs.y - 1) / cs.y,
    (threads.z + cs.z - 1) / cs.z
  );
}

//- Viewport / scissor

Rng3 G_ViewportFromTexture(G_ResourceHandle texture)
{
  Vec2I32 dims = G_Count2D(texture);
  return RNG3(VEC3(0, 0, 0), VEC3(dims.x, dims.y, 1));
}

Rng2 G_ScissorFromTexture(G_ResourceHandle texture)
{
  Vec2I32 dims = G_Count2D(texture);
  return RNG2(VEC2(0, 0), VEC2(dims.x, dims.y));
}

//- Shared resources


G_SamplerStateRef G_BasicSamplerFromKind(G_BasicSamplerKind kind)
{
  return G.basic_samplers[kind];
}

G_IndexBufferDesc G_QuadIndices(void)
{
  return G.quad_indices;
}

G_Texture2DRef G_BlankTexture2D(void)
{
  return G.blank_tex;
}

G_Texture3DRef G_BasicNoiseTexture(void)
{
  return G.basic_noise;
}