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

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• Author : Corentin Wallez
  Date : 2015-09-14 11:52:44
  Hash : 178e5974
  Message : In Chromium Mac builds do not find cstdint, use stdint.h instead BUG=angleproject:891 Change-Id: Idf2a89ad26955df3579bb2c1883137589f68f573 Reviewed-on: https://chromium-review.googlesource.com/299720 Tryjob-Request: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tryjob-Request: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>

• samples/sample_util/tga_utils.cpp

• //
  // Copyright (c) 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;
      }
  }