/**************************************************************************
 *
 * Copyright 2012 Jose Fonseca
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sub license,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * AUTHORS,
 * AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 **************************************************************************/


/*
 * Auxiliary functions to compute the size of array/blob arguments.
 */

#pragma once


/* We purposedly don't include any D3D header, so that this header can be used
 * with all D3D versions. */

#include <assert.h>

#include <algorithm>

#include "os.hpp"


/**
 * Information about active sub-resource maps
 */
struct _MAP_DESC
{
    VOID * pData;
    size_t Size;

    _MAP_DESC(void) :
        pData(0),
        Size(0)
    {}
};


static size_t
_calcDataSize(DXGI_FORMAT Format, UINT Width, UINT Height, UINT RowPitch, UINT Depth = 1, UINT DepthPitch = 0) {
    if (Width == 0 || Height == 0 || Depth == 0) {
        return 0;
    }

    size_t BlockSize = 0;
    UINT BlockWidth = 1;
    UINT BlockHeight = 1;
    switch (Format) {
    case DXGI_FORMAT_UNKNOWN:
        return 0;
    case DXGI_FORMAT_R32G32B32A32_TYPELESS:
    case DXGI_FORMAT_R32G32B32A32_FLOAT:
    case DXGI_FORMAT_R32G32B32A32_UINT:
    case DXGI_FORMAT_R32G32B32A32_SINT:
        BlockSize = 128;
        break;
    case DXGI_FORMAT_R32G32B32_TYPELESS:
    case DXGI_FORMAT_R32G32B32_FLOAT:
    case DXGI_FORMAT_R32G32B32_UINT:
    case DXGI_FORMAT_R32G32B32_SINT:
        BlockSize = 96;
        break;
    case DXGI_FORMAT_R16G16B16A16_TYPELESS:
    case DXGI_FORMAT_R16G16B16A16_FLOAT:
    case DXGI_FORMAT_R16G16B16A16_UNORM:
    case DXGI_FORMAT_R16G16B16A16_UINT:
    case DXGI_FORMAT_R16G16B16A16_SNORM:
    case DXGI_FORMAT_R16G16B16A16_SINT:
    case DXGI_FORMAT_R32G32_TYPELESS:
    case DXGI_FORMAT_R32G32_FLOAT:
    case DXGI_FORMAT_R32G32_UINT:
    case DXGI_FORMAT_R32G32_SINT:
    case DXGI_FORMAT_R32G8X24_TYPELESS:
    case DXGI_FORMAT_D32_FLOAT_S8X24_UINT:
    case DXGI_FORMAT_R32_FLOAT_X8X24_TYPELESS:
    case DXGI_FORMAT_X32_TYPELESS_G8X24_UINT:
        BlockSize = 64;
        break;
    case DXGI_FORMAT_R10G10B10A2_TYPELESS:
    case DXGI_FORMAT_R10G10B10A2_UNORM:
    case DXGI_FORMAT_R10G10B10A2_UINT:
    case DXGI_FORMAT_R11G11B10_FLOAT:
    case DXGI_FORMAT_R8G8B8A8_TYPELESS:
    case DXGI_FORMAT_R8G8B8A8_UNORM:
    case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
    case DXGI_FORMAT_R8G8B8A8_UINT:
    case DXGI_FORMAT_R8G8B8A8_SNORM:
    case DXGI_FORMAT_R8G8B8A8_SINT:
    case DXGI_FORMAT_R16G16_TYPELESS:
    case DXGI_FORMAT_R16G16_FLOAT:
    case DXGI_FORMAT_R16G16_UNORM:
    case DXGI_FORMAT_R16G16_UINT:
    case DXGI_FORMAT_R16G16_SNORM:
    case DXGI_FORMAT_R16G16_SINT:
    case DXGI_FORMAT_R32_TYPELESS:
    case DXGI_FORMAT_D32_FLOAT:
    case DXGI_FORMAT_R32_FLOAT:
    case DXGI_FORMAT_R32_UINT:
    case DXGI_FORMAT_R32_SINT:
    case DXGI_FORMAT_R24G8_TYPELESS:
    case DXGI_FORMAT_D24_UNORM_S8_UINT:
    case DXGI_FORMAT_R24_UNORM_X8_TYPELESS:
    case DXGI_FORMAT_X24_TYPELESS_G8_UINT:
    case DXGI_FORMAT_R9G9B9E5_SHAREDEXP:
    case DXGI_FORMAT_B8G8R8A8_UNORM:
    case DXGI_FORMAT_B8G8R8X8_UNORM:
    case DXGI_FORMAT_R10G10B10_XR_BIAS_A2_UNORM:
    case DXGI_FORMAT_B8G8R8A8_TYPELESS:
    case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
    case DXGI_FORMAT_B8G8R8X8_TYPELESS:
    case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
        BlockSize = 32;
        break;
    case DXGI_FORMAT_R8G8_TYPELESS:
    case DXGI_FORMAT_R8G8_UNORM:
    case DXGI_FORMAT_R8G8_UINT:
    case DXGI_FORMAT_R8G8_SNORM:
    case DXGI_FORMAT_R8G8_SINT:
    case DXGI_FORMAT_R16_TYPELESS:
    case DXGI_FORMAT_R16_FLOAT:
    case DXGI_FORMAT_D16_UNORM:
    case DXGI_FORMAT_R16_UNORM:
    case DXGI_FORMAT_R16_UINT:
    case DXGI_FORMAT_R16_SNORM:
    case DXGI_FORMAT_R16_SINT:
    case DXGI_FORMAT_B5G6R5_UNORM:
    case DXGI_FORMAT_B5G5R5A1_UNORM:
        BlockSize = 16;
        break;
    case DXGI_FORMAT_R8_TYPELESS:
    case DXGI_FORMAT_R8_UNORM:
    case DXGI_FORMAT_R8_UINT:
    case DXGI_FORMAT_R8_SNORM:
    case DXGI_FORMAT_R8_SINT:
    case DXGI_FORMAT_A8_UNORM:
        BlockSize = 8;
        break;
    case DXGI_FORMAT_R1_UNORM:
        BlockSize = 1;
        break;
    case DXGI_FORMAT_R8G8_B8G8_UNORM:
    case DXGI_FORMAT_G8R8_G8B8_UNORM:
        BlockSize = 32;
        BlockWidth = 2;
        break;
    case DXGI_FORMAT_BC1_TYPELESS:
    case DXGI_FORMAT_BC1_UNORM:
    case DXGI_FORMAT_BC1_UNORM_SRGB:
    case DXGI_FORMAT_BC4_TYPELESS:
    case DXGI_FORMAT_BC4_UNORM:
    case DXGI_FORMAT_BC4_SNORM:
        BlockSize = 64;
        BlockWidth = 4;
        BlockHeight = 4;
        break;
    case DXGI_FORMAT_BC2_TYPELESS:
    case DXGI_FORMAT_BC2_UNORM:
    case DXGI_FORMAT_BC2_UNORM_SRGB:
    case DXGI_FORMAT_BC3_TYPELESS:
    case DXGI_FORMAT_BC3_UNORM:
    case DXGI_FORMAT_BC3_UNORM_SRGB:
    case DXGI_FORMAT_BC5_TYPELESS:
    case DXGI_FORMAT_BC5_UNORM:
    case DXGI_FORMAT_BC5_SNORM:
    case DXGI_FORMAT_BC6H_TYPELESS:
    case DXGI_FORMAT_BC6H_UF16:
    case DXGI_FORMAT_BC6H_SF16:
    case DXGI_FORMAT_BC7_TYPELESS:
    case DXGI_FORMAT_BC7_UNORM:
    case DXGI_FORMAT_BC7_UNORM_SRGB:
        BlockSize = 128;
        BlockWidth = 4;
        BlockHeight = 4;
        break;
    default:
        os::log("apitrace: warning: %s: unknown format 0x%04X\n", __FUNCTION__, Format);
        return 0;
    }

    Width  = (Width  + BlockWidth - 1) / BlockWidth;
    Height = (Height + BlockHeight - 1) / BlockHeight;

    size_t size = (Width * BlockSize + 7)/ 8;

    if (Height > 1) {
        size += (Height - 1) * RowPitch;
    }

    if (Depth > 1) {
        size += (Depth - 1) * DepthPitch;
    }

    return size;
}

static size_t
_calcMipDataSize(UINT MipLevel, DXGI_FORMAT Format, UINT Width, UINT Height, UINT RowPitch, UINT Depth = 1, UINT DepthPitch = 0) {
    if (Width == 0 || Height == 0 || Depth == 0) {
        return 0;
    }

    Width  = std::max(Width  >> MipLevel, UINT(1));
    Height = std::max(Height >> MipLevel, UINT(1));
    Depth  = std::max(Depth  >> MipLevel, UINT(1));

    return _calcDataSize(Format, Width, Height, RowPitch, Depth, DepthPitch);
}


inline UINT
_getNumMipLevels(UINT Width, UINT Height = 1, UINT Depth = 1) {
    UINT MipLevels = 0;
    do {
        ++MipLevels;
        Width  >>= 1;
        Height >>= 1;
        Depth  >>= 1;
    } while (Width || Height || Depth);
    return MipLevels;
}


static inline void
_getMapDesc(IDXGISurface *pResource, DXGI_MAPPED_RECT * pLockedRect, UINT MapFlags,
            _MAP_DESC & MapDesc) {
    MapDesc.pData = 0;
    MapDesc.Size = 0;

    if (!(MapFlags & DXGI_MAP_WRITE)) {
        return;
    }

    DXGI_SURFACE_DESC Desc;
    HRESULT hr = pResource->GetDesc(&Desc);
    if (FAILED(hr)) {
        return;
    }

    MapDesc.pData = pLockedRect->pBits;
    MapDesc.Size = _calcDataSize(Desc.Format, Desc.Width, Desc.Height, pLockedRect->Pitch);
}