/*
 * Copyright 2009 Tony Wasserka
 * Copyright 2010 Christian Costa
 * Copyright 2010 Owen Rudge for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "wine/debug.h"
#include "d3dx9_36_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(d3dx);

/* Returns TRUE if num is a power of 2, FALSE if not, or if 0 */
BOOL is_pow2(UINT num)
{
    return !(num & (num - 1));
}

/* Returns the smallest power of 2 which is greater than or equal to num */
UINT make_pow2(UINT num)
{
    UINT result = 1;

    /* In the unlikely event somebody passes a large value, make sure we don't enter an infinite loop */
    if (num >= 0x80000000)
        return 0x80000000;

    while (result < num)
        result <<= 1;

    return result;
}

HRESULT WINAPI D3DXCheckTextureRequirements(LPDIRECT3DDEVICE9 device,
                                            UINT* width,
                                            UINT* height,
                                            UINT* miplevels,
                                            DWORD usage,
                                            D3DFORMAT* format,
                                            D3DPOOL pool)
{
    UINT w = (width && *width) ? *width : 1;
    UINT h = (height && *height) ? *height : 1;
    D3DCAPS9 caps;

    TRACE("(%p, %p, %p, %p, %u, %p, %u)\n", device, width, height, miplevels, usage, format, pool);

    if (!device)
        return D3DERR_INVALIDCALL;

    /* usage */
    if ((usage != D3DX_DEFAULT) &&
        (usage & (D3DUSAGE_WRITEONLY | D3DUSAGE_DONOTCLIP | D3DUSAGE_POINTS | D3DUSAGE_RTPATCHES | D3DUSAGE_NPATCHES)))
        return D3DERR_INVALIDCALL;

    /* pool */
    if ((pool != D3DPOOL_DEFAULT) && (pool != D3DPOOL_MANAGED) && (pool != D3DPOOL_SYSTEMMEM) && (pool != D3DPOOL_SCRATCH))
        return D3DERR_INVALIDCALL;

    /* width and height */
    if (FAILED(IDirect3DDevice9_GetDeviceCaps(device, &caps)))
        return D3DERR_INVALIDCALL;

    /* 256 x 256 default width/height */
    if ((w == D3DX_DEFAULT) && (h == D3DX_DEFAULT))
        w = h = 256;
    else if (w == D3DX_DEFAULT)
        w = (height ? h : 256);
    else if (h == D3DX_DEFAULT)
        h = (width ? w : 256);

    /* ensure width/height is power of 2 */
    if ((caps.TextureCaps & D3DPTEXTURECAPS_POW2) && (!is_pow2(w)))
        w = make_pow2(w);

    if (w > caps.MaxTextureWidth)
        w = caps.MaxTextureWidth;

    if ((caps.TextureCaps & D3DPTEXTURECAPS_POW2) && (!is_pow2(h)))
        h = make_pow2(h);

    if (h > caps.MaxTextureHeight)
        h = caps.MaxTextureHeight;

    /* texture must be square? */
    if (caps.TextureCaps & D3DPTEXTURECAPS_SQUAREONLY)
    {
        if (w > h)
            h = w;
        else
            w = h;
    }

    if (width)
        *width = w;

    if (height)
        *height = h;

    /* miplevels */
    if (miplevels)
    {
        UINT max_mipmaps = 1;

        if (!width && !height)
            max_mipmaps = 9;    /* number of mipmaps in a 256x256 texture */
        else
        {
            UINT max_dimen = max(w, h);

            while (max_dimen > 1)
            {
                max_dimen >>= 1;
                max_mipmaps++;
            }
        }

        if (*miplevels == 0 || *miplevels > max_mipmaps)
            *miplevels = max_mipmaps;
    }

    /* format */
    if (format)
    {
        D3DDEVICE_CREATION_PARAMETERS params;
        IDirect3D9 *d3d = NULL;
        D3DDISPLAYMODE mode;
        HRESULT hr;

        hr = IDirect3DDevice9_GetDirect3D(device, &d3d);

        if (FAILED(hr))
            goto cleanup;

        hr = IDirect3DDevice9_GetCreationParameters(device, &params);

        if (FAILED(hr))
            goto cleanup;

        hr = IDirect3DDevice9_GetDisplayMode(device, 0, &mode);

        if (FAILED(hr))
            goto cleanup;

        if ((*format == D3DFMT_UNKNOWN) || (*format == D3DX_DEFAULT))
            *format = D3DFMT_A8R8G8B8;

        hr = IDirect3D9_CheckDeviceFormat(d3d, params.AdapterOrdinal, params.DeviceType, mode.Format, usage,
            D3DRTYPE_TEXTURE, *format);

        if (FAILED(hr))
            FIXME("Pixel format adjustment not implemented yet\n");

cleanup:

        if (d3d)
            IDirect3D9_Release(d3d);

        if (FAILED(hr))
            return D3DERR_INVALIDCALL;
    }

    return D3D_OK;
}

HRESULT WINAPI D3DXCreateTexture(LPDIRECT3DDEVICE9 pDevice,
                                 UINT width,
                                 UINT height,
                                 UINT miplevels,
                                 DWORD usage,
                                 D3DFORMAT format,
                                 D3DPOOL pool,
                                 LPDIRECT3DTEXTURE9 *ppTexture)
{
    HRESULT hr;

    TRACE("(%p, %u, %u, %u, %x, %x, %x, %p)\n", pDevice, width, height, miplevels, usage, format,
        pool, ppTexture);

    if (!pDevice || !ppTexture)
        return D3DERR_INVALIDCALL;

    hr = D3DXCheckTextureRequirements(pDevice, &width, &height, &miplevels, usage, &format, pool);

    if (FAILED(hr))
        return hr;

    return IDirect3DDevice9_CreateTexture(pDevice, width, height, miplevels, usage, format, pool, ppTexture, NULL);
}

HRESULT WINAPI D3DXCreateTextureFromFileInMemoryEx(LPDIRECT3DDEVICE9 device,
                                                   LPCVOID srcdata,
                                                   UINT srcdatasize,
                                                   UINT width,
                                                   UINT height,
                                                   UINT miplevels,
                                                   DWORD usage,
                                                   D3DFORMAT format,
                                                   D3DPOOL pool,
                                                   DWORD filter,
                                                   DWORD mipfilter,
                                                   D3DCOLOR colorkey,
                                                   D3DXIMAGE_INFO* srcinfo,
                                                   PALETTEENTRY* palette,
                                                   LPDIRECT3DTEXTURE9* texture)
{
    FIXME("(%p, %p, %u, %u, %u, %u, %x, %x, %x, %u, %u, %x, %p, %p, %p): stub\n", device, srcdata, srcdatasize, width,
        height, miplevels, usage, format, pool, filter, mipfilter, colorkey, srcinfo, palette, texture);

    return E_NOTIMPL;
}

HRESULT WINAPI D3DXCreateTextureFromFileExW(LPDIRECT3DDEVICE9 device,
                                            LPCWSTR srcfile,
                                            UINT width,
                                            UINT height,
                                            UINT miplevels,
                                            DWORD usage,
                                            D3DFORMAT format,
                                            D3DPOOL pool,
                                            DWORD filter,
                                            DWORD mipfilter,
                                            D3DCOLOR colorkey,
                                            D3DXIMAGE_INFO *srcinfo,
                                            PALETTEENTRY *palette,
                                            LPDIRECT3DTEXTURE9 *texture)
{
    HRESULT hr;
    DWORD size;
    LPVOID buffer;

    TRACE("(%p, %p, %u, %u, %u, %x, %x, %x, %u, %u, %x, %p, %p, %p): relay\n", device, debugstr_w(srcfile), width,
        height, miplevels, usage, format, pool, filter, mipfilter, colorkey, srcinfo, palette, texture);

    if (!srcfile)
        return D3DERR_INVALIDCALL;

    hr = map_view_of_file(srcfile, &buffer, &size);
    if (FAILED(hr))
        return D3DXERR_INVALIDDATA;

    hr = D3DXCreateTextureFromFileInMemoryEx(device, buffer, size, width, height, miplevels, usage, format, pool,
        filter, mipfilter, colorkey, srcinfo, palette, texture);

    UnmapViewOfFile(buffer);

    return hr;
}

HRESULT WINAPI D3DXCreateTextureFromFileA(LPDIRECT3DDEVICE9 device,
                                          LPCSTR srcfile,
                                          LPDIRECT3DTEXTURE9 *texture)
{
    FIXME("(%p, %s, %p): stub\n", device, debugstr_a(srcfile), texture);

    return E_NOTIMPL;
}