BC7TextureReader.cpp

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#include <tdme/engine/fileio/textures/BC7TextureReader.h>
 
#include <array>
#include <string>
 
#include <tdme/tdme.h>
#include <tdme/utilities/ByteBuffer.h>
 
#include <ext/bc7enc_rdo/bc7decomp.h>
 
using std::array;
using std::string;
 
using tdme::engine::fileio::textures::BC7TextureReader;
 
using tdme::utilities::ByteBuffer;
 
bool BC7TextureReader::read(int width, int height, int bytesPerPixel, const vector<uint8_t>& bc7Data, ByteBuffer& textureByteBuffer) {
    //
    auto xBlocks = static_cast<int>(Math::ceil(width / 4.0f));
    auto yBlocks = static_cast<int>(Math::ceil(height / 4.0f));
 
    //
    auto textureByteBufferBuffer = textureByteBuffer.getBuffer();
 
    //
    for (auto yBlock = 0; yBlock < yBlocks; yBlock++) {
        for (auto xBlock = 0; xBlock < xBlocks; xBlock++) {
            //
            array<bc7decomp::color_rgba, 4 * 4> rgbaBlockPixels { 0 };
            bc7decomp::unpack_bc7(&bc7Data.data()[yBlock * xBlocks * 16 + xBlock * 16], rgbaBlockPixels.data());
            //
            auto blockPixelIdx = 0;
            auto xBlockOffset = xBlock * 4;
            auto yBlockOffset = yBlock * 4;
            for (int y = 0; y < 4; y++) {
                for (int x = 0; x < 4; x++) {
                    auto offset = (yBlockOffset + y) * width * bytesPerPixel + (xBlockOffset + x) * bytesPerPixel;
                    auto red = rgbaBlockPixels[blockPixelIdx].r;
                    auto green = rgbaBlockPixels[blockPixelIdx].g;
                    auto blue = rgbaBlockPixels[blockPixelIdx].b;
                    auto alpha = rgbaBlockPixels[blockPixelIdx].a;
                    if (offset < textureByteBuffer.getCapacity()) {
                        textureByteBufferBuffer[offset + 0] = red;
                        textureByteBufferBuffer[offset + 1] = green;
                        textureByteBufferBuffer[offset + 2] = blue;
                        if (bytesPerPixel == 4) textureByteBufferBuffer[offset + 3] = alpha;
                    }
                    blockPixelIdx++;
                }
            }
        }
    }
    //
    return false;
}