//=====================================================================
// Copyright (c) 2020    Advanced Micro Devices, Inc. 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, sublicense, 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 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 NONINFRINGEMENT.IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS 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.
//
//=====================================================================
#include "BC3_Encode_kernel.h"

//============================================== BC3 INTERFACES =======================================================
#ifndef ASPM_HLSL

void CompressBlockBC3_Internal(const CMP_Vec4uc srcBlockTemp[16],
                               CMP_GLOBAL CGU_UINT32 compressedBlock[4],
                               CMP_GLOBAL CMP_BC15Options *BC15options) {
  CGU_Vec3f  rgbBlock[16];
  CGU_FLOAT  alphaBlock[BLOCK_SIZE_4X4];

  for (CGU_INT32 i = 0; i < 16; i++) {
        rgbBlock[i].x  = (CGU_FLOAT)(srcBlockTemp[i].x & 0xFF)/255;  // R
        rgbBlock[i].y  = (CGU_FLOAT)(srcBlockTemp[i].y & 0xFF)/255;  // G
        rgbBlock[i].z  = (CGU_FLOAT)(srcBlockTemp[i].z & 0xFF)/255;  // B
        alphaBlock[i]  = (CGU_FLOAT)(srcBlockTemp[i].w) / 255.0f;
  }

    CMP_BC15Options internalOptions = *BC15options;

    CGU_Vec2ui cmpBlock;

    cmpBlock = cmp_compressAlphaBlock(alphaBlock,internalOptions.m_fquality);
    compressedBlock[0] = cmpBlock.x;
    compressedBlock[1] = cmpBlock.y;

    for (CGU_INT32 i = 0; i < 16; i++) {
        alphaBlock[i]  = (CGU_FLOAT)(srcBlockTemp[i].w);
    }

    internalOptions = CalculateColourWeightings3f(rgbBlock, internalOptions);
    CGU_Vec3f  channelWeights     = {internalOptions.m_fChannelWeights[0],internalOptions.m_fChannelWeights[1],internalOptions.m_fChannelWeights[2]};

    cmpBlock = CompressBlockBC1_RGBA_Internal(
                 rgbBlock, 
                 alphaBlock,
                 channelWeights,
                 0, // internalOptions.m_nAlphaThreshold,
                 1, // internalOptions.m_nRefinementSteps
                 internalOptions.m_fquality,
                 FALSE);


    compressedBlock[2] = cmpBlock.x;
    compressedBlock[3] = cmpBlock.y;
}
#endif

//============================================== USER INTERFACES ========================================================
#ifndef ASPM_GPU

int CMP_CDECL CreateOptionsBC3(void **options)
{
    CMP_BC15Options *BC15optionsDefault = new CMP_BC15Options;
    if (BC15optionsDefault) {
        SetDefaultBC15Options(BC15optionsDefault);
        (*options) = BC15optionsDefault;
    }
    else {
        (*options) = NULL;
        return CGU_CORE_ERR_NEWMEM;
    }
    return CGU_CORE_OK;
}


int CMP_CDECL DestroyOptionsBC3(void *options)
{
    if (!options) return CGU_CORE_ERR_INVALIDPTR;
    CMP_BC15Options *BCOptions = reinterpret_cast <CMP_BC15Options *>(options);
    delete BCOptions;
    return CGU_CORE_OK;
}

int CMP_CDECL SetQualityBC3(void *options,
    CGU_FLOAT fquality)
{
    if (!options) return CGU_CORE_ERR_INVALIDPTR;
    CMP_BC15Options *BC15optionsDefault = reinterpret_cast <CMP_BC15Options *>(options);
    if (fquality < 0.0f) fquality = 0.0f;
    else
        if (fquality > 1.0f) fquality = 1.0f;
    BC15optionsDefault->m_fquality = fquality;
    return CGU_CORE_OK;
}

int CMP_CDECL SetChannelWeightsBC3(void *options,
    CGU_FLOAT WeightRed,
    CGU_FLOAT WeightGreen,
    CGU_FLOAT WeightBlue) {
    if (!options) return 1;
    CMP_BC15Options *BC15optionsDefault = (CMP_BC15Options *)options;

    if ((WeightRed < 0.0f) || (WeightRed > 1.0f))       return CGU_CORE_ERR_RANGERED;
    if ((WeightGreen < 0.0f) || (WeightGreen > 1.0f))   return CGU_CORE_ERR_RANGEGREEN;
    if ((WeightBlue < 0.0f) || (WeightBlue > 1.0f))     return CGU_CORE_ERR_RANGEBLUE;

    BC15optionsDefault->m_bUseChannelWeighting = true;
    BC15optionsDefault->m_fChannelWeights[0] = WeightRed;
    BC15optionsDefault->m_fChannelWeights[1] = WeightGreen;
    BC15optionsDefault->m_fChannelWeights[2] = WeightBlue;
    return CGU_CORE_OK;
}


void DecompressBC3_Internal(CMP_GLOBAL CGU_UINT8 rgbaBlock[64],
                            const CGU_UINT32 compressedBlock[4],
                            const CMP_BC15Options *BC15options) {
  CGU_UINT8 alphaBlock[BLOCK_SIZE_4X4];

  cmp_decompressAlphaBlock(alphaBlock, &compressedBlock[DXTC_OFFSET_ALPHA]);

  CGU_Vec2ui compBlock;
  compBlock.x = compressedBlock[DXTC_OFFSET_RGB];
  compBlock.y = compressedBlock[DXTC_OFFSET_RGB+1];
  cmp_decompressDXTRGBA_Internal(rgbaBlock, compBlock,BC15options->m_mapDecodeRGBA);

  for (CGU_UINT32 i = 0; i < 16; i++)
    ((CMP_GLOBAL CGU_UINT32 *)rgbaBlock)[i] =
        (alphaBlock[i] << RGBA8888_OFFSET_A) |
        (((CMP_GLOBAL CGU_UINT32 *)rgbaBlock)[i] &
         ~(BYTE_MASK << RGBA8888_OFFSET_A));
}

int CMP_CDECL CompressBlockBC3( const unsigned char *srcBlock,
                                unsigned int srcStrideInBytes,
                                CMP_GLOBAL unsigned char cmpBlock[16],
                                const void *options = NULL) {
    CMP_Vec4uc inBlock[16];

    //----------------------------------
    // Fill the inBlock with source data
    //----------------------------------
    CGU_INT srcpos = 0;
    CGU_INT dstptr = 0;
    for (CGU_UINT8 row = 0; row < 4; row++)
    {
        srcpos = row * srcStrideInBytes;
        for (CGU_UINT8 col = 0; col < 4; col++)
        {
            inBlock[dstptr].x = CGU_UINT8(srcBlock[srcpos++]);
            inBlock[dstptr].y = CGU_UINT8(srcBlock[srcpos++]);
            inBlock[dstptr].z = CGU_UINT8(srcBlock[srcpos++]);
            inBlock[dstptr].w = CGU_UINT8(srcBlock[srcpos++]);
            dstptr++;
        }
    }

    CMP_BC15Options *BC15options = (CMP_BC15Options *)options;
    CMP_BC15Options BC15optionsDefault;
    if (BC15options == NULL) {
      BC15options = &BC15optionsDefault;
      SetDefaultBC15Options(BC15options);
    }

    CompressBlockBC3_Internal(inBlock,(CMP_GLOBAL CGU_UINT32 *)cmpBlock, BC15options);
    return CGU_CORE_OK;
}

int CMP_CDECL DecompressBlockBC3(const unsigned char cmpBlock[16],
                                 CMP_GLOBAL unsigned char srcBlock[64],
                                 const void *options = NULL) {
    CMP_BC15Options *BC15options = (CMP_BC15Options *)options;
    CMP_BC15Options BC15optionsDefault;
    if (BC15options == NULL)
    {
        BC15options = &BC15optionsDefault;
        SetDefaultBC15Options(BC15options);
    }
    DecompressBC3_Internal(srcBlock, (CGU_UINT32 *)cmpBlock,BC15options);
    return CGU_CORE_OK;
}
#endif

//============================================== OpenCL USER INTERFACE ====================================================
#ifdef ASPM_OPENCL
CMP_STATIC CMP_KERNEL void CMP_GPUEncoder(
    CMP_GLOBAL const CMP_Vec4uc *ImageSource,
    CMP_GLOBAL CGU_UINT8 *ImageDestination, CMP_GLOBAL Source_Info *SourceInfo,
    CMP_GLOBAL CMP_BC15Options *BC15options) {
  CGU_UINT32 xID;
  CGU_UINT32 yID;

#ifdef ASPM_GPU
  xID = get_global_id(0);
  yID = get_global_id(1);
#else
  xID = 0;
  yID = 0;
#endif

  if (xID >= (SourceInfo->m_src_width / BlockX)) return;
  if (yID >= (SourceInfo->m_src_height / BlockX)) return;
  int srcWidth = SourceInfo->m_src_width;

  CGU_UINT32 destI =
      (xID * BC3CompBlockSize) + (yID * (srcWidth / BlockX) * BC3CompBlockSize);
  int srcindex = 4 * (yID * srcWidth + xID);
  int blkindex = 0;
  CMP_Vec4uc srcData[16];
  srcWidth = srcWidth - 4;

  for (CGU_INT32 j = 0; j < 4; j++) {
    for (CGU_INT32 i = 0; i < 4; i++) {
      srcData[blkindex++] = ImageSource[srcindex++];
    }
    srcindex += srcWidth;
  }

  CompressBlockBC3_Internal(
      srcData, (CMP_GLOBAL CGU_UINT32 *)&ImageDestination[destI], BC15options);
}
#endif
