mirror of
https://github.com/OpenSpace/OpenSpace.git
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125 lines
4.8 KiB
C++
125 lines
4.8 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2016 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#include <modules/globebrowsing/rendering/gdaldataconverter.h>
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namespace {
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const std::string _loggerCat = "GdalDataConverter";
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}
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namespace openspace {
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GdalDataConverter::GdalDataConverter()
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{
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}
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GdalDataConverter::~GdalDataConverter()
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{
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}
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std::shared_ptr<Texture> GdalDataConverter::convertToOpenGLTexture(GDALDataset* dataSet)
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{
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int nCols = dataSet->GetRasterBand(1)->GetXSize();
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int nRows = dataSet->GetRasterBand(1)->GetYSize();
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GDALRasterBand* redBand = dataSet->GetRasterBand(1);
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GDALRasterBand* greenBand = dataSet->GetRasterBand(2);
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GDALRasterBand* blueBand = dataSet->GetRasterBand(3);
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int blockSizeX;
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int blockSizeY;
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redBand->GetBlockSize(&blockSizeX, &blockSizeY);
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int nBlocksX = nCols / blockSizeX;
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int nBlocksY = nRows / blockSizeY;
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// A block where data is copied
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GByte* blockR = (GByte*)CPLMalloc(sizeof(GByte) * blockSizeX * blockSizeY);
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GByte* blockG = (GByte*)CPLMalloc(sizeof(GByte) * blockSizeX * blockSizeY);
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GByte* blockB = (GByte*)CPLMalloc(sizeof(GByte) * blockSizeX * blockSizeY);
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// The data that the texture should use
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GLubyte* imageData = (GLubyte*)CPLMalloc(sizeof(GLubyte) * nCols * nRows * 4);
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// For each block
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for (size_t blockY = 0; blockY < nBlocksY; blockY++)
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{
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for (size_t blockX = 0; blockX < nBlocksX; blockX++)
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{
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redBand->ReadBlock(blockX, blockY, blockR);
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greenBand->ReadBlock(blockX, blockY, blockG);
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blueBand->ReadBlock(blockX, blockY, blockB);
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size_t blockPixelIndexX = blockSizeX * blockX;
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size_t blockPixelIndexY = blockSizeY * blockY;
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size_t startPixelIndex = blockPixelIndexY * nCols + blockPixelIndexX;
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// For each pixel in each block
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for (size_t yInBlock = 0; yInBlock < blockSizeY; yInBlock++)
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{
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for (size_t xInBlock = 0; xInBlock < blockSizeX; xInBlock++)
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{
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size_t pixelIndexInBlock = xInBlock + yInBlock * blockSizeX;
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size_t globalPixelIndex = (startPixelIndex + xInBlock + yInBlock * nCols) * 4;
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GLubyte pixelR = blockR[pixelIndexInBlock];
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GLubyte pixelG = blockG[pixelIndexInBlock];
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GLubyte pixelB = blockB[pixelIndexInBlock];
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imageData[globalPixelIndex + 0] = pixelR;
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imageData[globalPixelIndex + 1] = pixelG;
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imageData[globalPixelIndex + 2] = pixelB;
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imageData[globalPixelIndex + 3] = 255;
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}
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}
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}
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}
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// The texture should take ownership of the data
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std::shared_ptr<Texture> texture = std::shared_ptr<Texture>(new Texture(
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static_cast<void*>(imageData),
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glm::uvec3(nCols, nRows, 1),
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Texture::Format::RGBA,
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GL_RGBA,
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GL_UNSIGNED_BYTE,
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Texture::FilterMode::Linear,
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Texture::WrappingMode::Repeat));
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// Free the row
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CPLFree(blockR);
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CPLFree(blockG);
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CPLFree(blockB);
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// Do not free imageData since the texture now has ownership of it
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return texture;
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}
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} // namespace openspace
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