/*
 * Copyright (C) 2009 Tony Wasserka
 *
 * 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);

static void la_from_rgba(const struct vec4 *rgba, struct vec4 *la)
{
    la->x = rgba->x * 0.2125f + rgba->y * 0.7154f + rgba->z * 0.0721f;
    la->w = rgba->w;
}

static void la_to_rgba(const struct vec4 *la, struct vec4 *rgba, const PALETTEENTRY *palette)
{
    rgba->x = la->x;
    rgba->y = la->x;
    rgba->z = la->x;
    rgba->w = la->w;
}

static void index_to_rgba(const struct vec4 *index, struct vec4 *rgba, const PALETTEENTRY *palette)
{
    ULONG idx = (ULONG)(index->x * 255.0f + 0.5f);

    rgba->x = palette[idx].peRed / 255.0f;
    rgba->y = palette[idx].peGreen / 255.0f;
    rgba->z = palette[idx].peBlue / 255.0f;
    rgba->w = palette[idx].peFlags / 255.0f; /* peFlags is the alpha component in DX8 and higher */
}

/************************************************************
 * pixel format table providing info about number of bytes per pixel,
 * number of bits per channel and format type.
 *
 * Call get_format_info to request information about a specific format.
 */
static const struct pixel_format_desc formats[] =
{
    /* format              bpc               shifts             bpp blocks   type            from_rgba     to_rgba */
    {D3DFMT_R8G8B8,        { 0,  8,  8,  8}, { 0, 16,  8,  0},  3, 1, 1,  3, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A8R8G8B8,      { 8,  8,  8,  8}, {24, 16,  8,  0},  4, 1, 1,  4, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_X8R8G8B8,      { 0,  8,  8,  8}, { 0, 16,  8,  0},  4, 1, 1,  4, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A8B8G8R8,      { 8,  8,  8,  8}, {24,  0,  8, 16},  4, 1, 1,  4, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_X8B8G8R8,      { 0,  8,  8,  8}, { 0,  0,  8, 16},  4, 1, 1,  4, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_R5G6B5,        { 0,  5,  6,  5}, { 0, 11,  5,  0},  2, 1, 1,  2, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_X1R5G5B5,      { 0,  5,  5,  5}, { 0, 10,  5,  0},  2, 1, 1,  2, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A1R5G5B5,      { 1,  5,  5,  5}, {15, 10,  5,  0},  2, 1, 1,  2, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_R3G3B2,        { 0,  3,  3,  2}, { 0,  5,  2,  0},  1, 1, 1,  1, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A8R3G3B2,      { 8,  3,  3,  2}, { 8,  5,  2,  0},  2, 1, 1,  2, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A4R4G4B4,      { 4,  4,  4,  4}, {12,  8,  4,  0},  2, 1, 1,  2, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_X4R4G4B4,      { 0,  4,  4,  4}, { 0,  8,  4,  0},  2, 1, 1,  2, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A2R10G10B10,   { 2, 10, 10, 10}, {30, 20, 10,  0},  4, 1, 1,  4, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A2B10G10R10,   { 2, 10, 10, 10}, {30,  0, 10, 20},  4, 1, 1,  4, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A16B16G16R16,  {16, 16, 16, 16}, {48,  0, 16, 32},  8, 1, 1,  8, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_G16R16,        { 0, 16, 16,  0}, { 0,  0, 16,  0},  4, 1, 1,  4, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A8,            { 8,  0,  0,  0}, { 0,  0,  0,  0},  1, 1, 1,  1, FORMAT_ARGB,    NULL,         NULL      },
    {D3DFMT_A8L8,          { 8,  8,  0,  0}, { 8,  0,  0,  0},  2, 1, 1,  2, FORMAT_ARGB,    la_from_rgba, la_to_rgba},
    {D3DFMT_A4L4,          { 4,  4,  0,  0}, { 4,  0,  0,  0},  1, 1, 1,  1, FORMAT_ARGB,    la_from_rgba, la_to_rgba},
    {D3DFMT_L8,            { 0,  8,  0,  0}, { 0,  0,  0,  0},  1, 1, 1,  1, FORMAT_ARGB,    la_from_rgba, la_to_rgba},
    {D3DFMT_L16,           { 0, 16,  0,  0}, { 0,  0,  0,  0},  2, 1, 1,  2, FORMAT_ARGB,    la_from_rgba, la_to_rgba},
    {D3DFMT_DXT1,          { 0,  0,  0,  0}, { 0,  0,  0,  0},  1, 4, 4,  8, FORMAT_DXT,     NULL,         NULL      },
    {D3DFMT_DXT2,          { 0,  0,  0,  0}, { 0,  0,  0,  0},  1, 4, 4, 16, FORMAT_DXT,     NULL,         NULL      },
    {D3DFMT_DXT3,          { 0,  0,  0,  0}, { 0,  0,  0,  0},  1, 4, 4, 16, FORMAT_DXT,     NULL,         NULL      },
    {D3DFMT_DXT4,          { 0,  0,  0,  0}, { 0,  0,  0,  0},  1, 4, 4, 16, FORMAT_DXT,     NULL,         NULL      },
    {D3DFMT_DXT5,          { 0,  0,  0,  0}, { 0,  0,  0,  0},  1, 4, 4, 16, FORMAT_DXT,     NULL,         NULL      },
    {D3DFMT_R16F,          { 0, 16,  0,  0}, { 0,  0,  0,  0},  2, 1, 1,  2, FORMAT_ARGBF16, NULL,         NULL      },
    {D3DFMT_G16R16F,       { 0, 16, 16,  0}, { 0,  0, 16,  0},  4, 1, 1,  4, FORMAT_ARGBF16, NULL,         NULL      },
    {D3DFMT_A16B16G16R16F, {16, 16, 16, 16}, {48,  0, 16, 32},  8, 1, 1,  8, FORMAT_ARGBF16, NULL,         NULL      },
    {D3DFMT_R32F,          { 0, 32,  0,  0}, { 0,  0,  0,  0},  4, 1, 1,  4, FORMAT_ARGBF,   NULL,         NULL      },
    {D3DFMT_G32R32F,       { 0, 32, 32,  0}, { 0,  0, 32,  0},  8, 1, 1,  8, FORMAT_ARGBF,   NULL,         NULL      },
    {D3DFMT_A32B32G32R32F, {32, 32, 32, 32}, {96,  0, 32, 64}, 16, 1, 1, 16, FORMAT_ARGBF,   NULL,         NULL      },
    {D3DFMT_P8,            { 8,  8,  8,  8}, { 0,  0,  0,  0},  1, 1, 1,  1, FORMAT_INDEX,   NULL,         index_to_rgba},
    /* marks last element */
    {D3DFMT_UNKNOWN,       { 0,  0,  0,  0}, { 0,  0,  0,  0},  0, 1, 1,  0, FORMAT_UNKNOWN, NULL,         NULL      },
};


/************************************************************
 * map_view_of_file
 *
 * Loads a file into buffer and stores the number of read bytes in length.
 *
 * PARAMS
 *   filename [I] name of the file to be loaded
 *   buffer   [O] pointer to destination buffer
 *   length   [O] size of the obtained data
 *
 * RETURNS
 *   Success: D3D_OK
 *   Failure:
 *     see error codes for CreateFileW, GetFileSize, CreateFileMapping and MapViewOfFile
 *
 * NOTES
 *   The caller must UnmapViewOfFile when it doesn't need the data anymore
 *
 */
HRESULT map_view_of_file(const WCHAR *filename, void **buffer, DWORD *length)
{
    HANDLE hfile, hmapping = NULL;

    hfile = CreateFileW(filename, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
    if(hfile == INVALID_HANDLE_VALUE) goto error;

    *length = GetFileSize(hfile, NULL);
    if(*length == INVALID_FILE_SIZE) goto error;

    hmapping = CreateFileMappingW(hfile, NULL, PAGE_READONLY, 0, 0, NULL);
    if(!hmapping) goto error;

    *buffer = MapViewOfFile(hmapping, FILE_MAP_READ, 0, 0, 0);
    if(*buffer == NULL) goto error;

    CloseHandle(hmapping);
    CloseHandle(hfile);

    return S_OK;

error:
    CloseHandle(hmapping);
    CloseHandle(hfile);
    return HRESULT_FROM_WIN32(GetLastError());
}

/************************************************************
 * load_resource_into_memory
 *
 * Loads a resource into buffer and stores the number of
 * read bytes in length.
 *
 * PARAMS
 *   module  [I] handle to the module
 *   resinfo [I] handle to the resource's information block
 *   buffer  [O] pointer to destination buffer
 *   length  [O] size of the obtained data
 *
 * RETURNS
 *   Success: D3D_OK
 *   Failure:
 *     See error codes for SizeofResource, LoadResource and LockResource
 *
 * NOTES
 *   The memory doesn't need to be freed by the caller manually
 *
 */
HRESULT load_resource_into_memory(HMODULE module, HRSRC resinfo, void **buffer, DWORD *length)
{
    HGLOBAL resource;

    *length = SizeofResource(module, resinfo);
    if(*length == 0) return HRESULT_FROM_WIN32(GetLastError());

    resource = LoadResource(module, resinfo);
    if( !resource ) return HRESULT_FROM_WIN32(GetLastError());

    *buffer = LockResource(resource);
    if(*buffer == NULL) return HRESULT_FROM_WIN32(GetLastError());

    return S_OK;
}

HRESULT write_buffer_to_file(const WCHAR *dst_filename, ID3DXBuffer *buffer)
{
    HRESULT hr = S_OK;
    void *buffer_pointer;
    DWORD buffer_size;
    DWORD bytes_written;
    HANDLE file = CreateFileW(dst_filename, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (file == INVALID_HANDLE_VALUE)
        return HRESULT_FROM_WIN32(GetLastError());

    buffer_pointer = ID3DXBuffer_GetBufferPointer(buffer);
    buffer_size = ID3DXBuffer_GetBufferSize(buffer);

    if (!WriteFile(file, buffer_pointer, buffer_size, &bytes_written, NULL))
        hr = HRESULT_FROM_WIN32(GetLastError());

    CloseHandle(file);
    return hr;
}


/************************************************************
 * get_format_info
 *
 * Returns information about the specified format.
 * If the format is unsupported, it's filled with the D3DFMT_UNKNOWN desc.
 *
 * PARAMS
 *   format [I] format whose description is queried
 *
 */
const struct pixel_format_desc *get_format_info(D3DFORMAT format)
{
    unsigned int i = 0;
    while(formats[i].format != format && formats[i].format != D3DFMT_UNKNOWN) i++;
    if (formats[i].format == D3DFMT_UNKNOWN)
        FIXME("Unknown format %#x (as FOURCC %s).\n", format, debugstr_an((const char *)&format, 4));
    return &formats[i];
}

const struct pixel_format_desc *get_format_info_idx(int idx)
{
    if(idx >= sizeof(formats) / sizeof(formats[0]))
        return NULL;
    if(formats[idx].format == D3DFMT_UNKNOWN)
        return NULL;
    return &formats[idx];
}

#define WINE_D3DX_TO_STR(x) case x: return #x

const char *debug_d3dxparameter_class(D3DXPARAMETER_CLASS c)
{
    switch (c)
    {
        WINE_D3DX_TO_STR(D3DXPC_SCALAR);
        WINE_D3DX_TO_STR(D3DXPC_VECTOR);
        WINE_D3DX_TO_STR(D3DXPC_MATRIX_ROWS);
        WINE_D3DX_TO_STR(D3DXPC_MATRIX_COLUMNS);
        WINE_D3DX_TO_STR(D3DXPC_OBJECT);
        WINE_D3DX_TO_STR(D3DXPC_STRUCT);
        default:
            FIXME("Unrecognized D3DXPARAMETER_CLASS %#x.\n", c);
            return "unrecognized";
    }
}

const char *debug_d3dxparameter_type(D3DXPARAMETER_TYPE t)
{
    switch (t)
    {
        WINE_D3DX_TO_STR(D3DXPT_VOID);
        WINE_D3DX_TO_STR(D3DXPT_BOOL);
        WINE_D3DX_TO_STR(D3DXPT_INT);
        WINE_D3DX_TO_STR(D3DXPT_FLOAT);
        WINE_D3DX_TO_STR(D3DXPT_STRING);
        WINE_D3DX_TO_STR(D3DXPT_TEXTURE);
        WINE_D3DX_TO_STR(D3DXPT_TEXTURE1D);
        WINE_D3DX_TO_STR(D3DXPT_TEXTURE2D);
        WINE_D3DX_TO_STR(D3DXPT_TEXTURE3D);
        WINE_D3DX_TO_STR(D3DXPT_TEXTURECUBE);
        WINE_D3DX_TO_STR(D3DXPT_SAMPLER);
        WINE_D3DX_TO_STR(D3DXPT_SAMPLER1D);
        WINE_D3DX_TO_STR(D3DXPT_SAMPLER2D);
        WINE_D3DX_TO_STR(D3DXPT_SAMPLER3D);
        WINE_D3DX_TO_STR(D3DXPT_SAMPLERCUBE);
        WINE_D3DX_TO_STR(D3DXPT_PIXELSHADER);
        WINE_D3DX_TO_STR(D3DXPT_VERTEXSHADER);
        WINE_D3DX_TO_STR(D3DXPT_PIXELFRAGMENT);
        WINE_D3DX_TO_STR(D3DXPT_VERTEXFRAGMENT);
        WINE_D3DX_TO_STR(D3DXPT_UNSUPPORTED);
        default:
            FIXME("Unrecognized D3DXPARAMETER_TYP %#x.\n", t);
            return "unrecognized";
    }
}

const char *debug_d3dxparameter_registerset(D3DXREGISTER_SET r)
{
    switch (r)
    {
        WINE_D3DX_TO_STR(D3DXRS_BOOL);
        WINE_D3DX_TO_STR(D3DXRS_INT4);
        WINE_D3DX_TO_STR(D3DXRS_FLOAT4);
        WINE_D3DX_TO_STR(D3DXRS_SAMPLER);
        default:
            FIXME("Unrecognized D3DXREGISTER_SET %#x.\n", r);
            return "unrecognized";
    }
}

#undef WINE_D3DX_TO_STR

/* parameter type conversion helpers */
static BOOL get_bool(D3DXPARAMETER_TYPE type, const void *data)
{
    switch (type)
    {
        case D3DXPT_FLOAT:
        case D3DXPT_INT:
        case D3DXPT_BOOL:
            return *(DWORD *)data != 0;

        case D3DXPT_VOID:
            return *(BOOL *)data;

        default:
            FIXME("Unhandled type %s.\n", debug_d3dxparameter_type(type));
            return FALSE;
    }
}

static INT get_int(D3DXPARAMETER_TYPE type, const void *data)
{
    switch (type)
    {
        case D3DXPT_FLOAT:
            return (INT)(*(FLOAT *)data);

        case D3DXPT_INT:
        case D3DXPT_VOID:
            return *(INT *)data;

        case D3DXPT_BOOL:
            return get_bool(type, data);

        default:
            FIXME("Unhandled type %s.\n", debug_d3dxparameter_type(type));
            return 0;
    }
}

static FLOAT get_float(D3DXPARAMETER_TYPE type, const void *data)
{
    switch (type)
    {
        case D3DXPT_FLOAT:
        case D3DXPT_VOID:
            return *(FLOAT *)data;

        case D3DXPT_INT:
            return (FLOAT)(*(INT *)data);

        case D3DXPT_BOOL:
            return (FLOAT)get_bool(type, data);

        default:
            FIXME("Unhandled type %s.\n", debug_d3dxparameter_type(type));
            return 0.0f;
    }
}

void set_number(void *outdata, D3DXPARAMETER_TYPE outtype, const void *indata, D3DXPARAMETER_TYPE intype)
{
    if (outtype == intype)
    {
        *(DWORD *)outdata = *(DWORD *)indata;
        return;
    }

    switch (outtype)
    {
        case D3DXPT_FLOAT:
            *(FLOAT *)outdata = get_float(intype, indata);
            break;

        case D3DXPT_BOOL:
            *(BOOL *)outdata = get_bool(intype, indata);
            break;

        case D3DXPT_INT:
            *(INT *)outdata = get_int(intype, indata);
            break;

        default:
            FIXME("Unhandled type %s.\n", debug_d3dxparameter_type(outtype));
            *(DWORD *)outdata = 0;
            break;
    }
}