kc3-lang/angle/samples/sample_util/tga_utils.cpp

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• Author : Stuart Morgan
  Date : 2019-08-14 12:25:12
  Hash : 9d737966
  Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• samples/sample_util/tga_utils.cpp

• //
  // Copyright 2014 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "tga_utils.h"
  
  #include <fstream>
  #include <iostream>
  #include <limits.h>
  #include <stdint.h>
  #include <string>
  
  TGAImage::TGAImage()
      : width(0), height(0), data(0)
  {
  }
  
  struct TGAHeader
  {
      uint8_t idSize;
      uint8_t mapType;
      uint8_t imageType;
      uint16_t paletteStart;
      uint16_t paletteSize;
      uint8_t paletteEntryDepth;
      uint16_t x;
      uint16_t y;
      uint16_t width;
      uint16_t height;
      uint8_t colorDepth;
      uint8_t descriptor;
  };
  
  #define INVERTED_BIT (1 << 5)
  
  template <typename dataType>
  void readBinary(std::ifstream &stream, dataType &item)
  {
      stream.read(reinterpret_cast<char *>(&item), sizeof(dataType));
  }
  
  template <typename dataType>
  void readBinary(std::ifstream &stream, std::vector<dataType> &items)
  {
      stream.read(reinterpret_cast<char *>(items.data()), sizeof(dataType) * items.size());
  }
  
  bool LoadTGAImageFromFile(const std::string &path, TGAImage *image)
  {
      std::ifstream stream(path, std::ios::binary);
      if (!stream)
      {
          std::cerr << "error opening tga file " << path << " for reading.\n";
          return false;
      }
  
      TGAHeader header;
      readBinary(stream, header.idSize);
      readBinary(stream, header.mapType);
      readBinary(stream, header.imageType);
      readBinary(stream, header.paletteStart);
      readBinary(stream, header.paletteSize);
      readBinary(stream, header.paletteEntryDepth);
      readBinary(stream, header.x);
      readBinary(stream, header.y);
      readBinary(stream, header.width);
      readBinary(stream, header.height);
      readBinary(stream, header.colorDepth);
      readBinary(stream, header.descriptor);
  
      image->width = header.width;
      image->height = header.height;
  
      size_t pixelComponentCount = header.colorDepth / CHAR_BIT;
      std::vector<unsigned char> buffer(header.width * header.height * pixelComponentCount);
      readBinary(stream, buffer);
  
      image->data.reserve(header.width * header.height);
  
      for (size_t y = 0; y < header.height; y++)
      {
          size_t rowIdx = ((header.descriptor & INVERTED_BIT) ? (header.height - 1 - y) : y) * header.width * pixelComponentCount;
          for (size_t x = 0; x < header.width; x++)
          {
              size_t pixelIdx = rowIdx + x * pixelComponentCount;
  
              Byte4 pixel;
              pixel[0] = (pixelComponentCount > 2) ? buffer[pixelIdx + 2] : 0;
              pixel[2] = (pixelComponentCount > 0) ? buffer[pixelIdx + 0] : 0;
              pixel[1] = (pixelComponentCount > 1) ? buffer[pixelIdx + 1] : 0;
              pixel[3] = (pixelComponentCount > 3) ? buffer[pixelIdx + 3] : 255;
  
              image->data.push_back(pixel);
          }
      }
  
      std::cout << "loaded image " << path << ".\n";
  
      return true;
  }
  
  GLuint LoadTextureFromTGAImage(const TGAImage &image)
  {
      if (image.width > 0 && image.height > 0)
      {
          GLuint texture;
          glGenTextures(1, &texture);
          glBindTexture(GL_TEXTURE_2D, texture);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
          glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
          glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, static_cast<GLsizei>(image.width), static_cast<GLsizei>(image.height), 0,
                       GL_RGBA, GL_UNSIGNED_BYTE, image.data.data());
          glGenerateMipmap(GL_TEXTURE_2D);
          return texture;
      }
      else
      {
          return 0;
      }
  }