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

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• Hash : 9d737966
  Author :
  Date : 2019-08-14T12:25:12
  

  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>
  

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• samples/sample_util/texture_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 "texture_utils.h"
  #include <array>
  
  GLuint CreateSimpleTexture2D()
  {
      // Use tightly packed data
      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  
      // Generate a texture object
      GLuint texture;
      glGenTextures(1, &texture);
  
      // Bind the texture object
      glBindTexture(GL_TEXTURE_2D, texture);
  
      // Load the texture: 2x2 Image, 3 bytes per pixel (R, G, B)
      const size_t width                 = 2;
      const size_t height                = 2;
      GLubyte pixels[width * height * 3] = {
          255, 0,   0,    // Red
          0,   255, 0,    // Green
          0,   0,   255,  // Blue
          255, 255, 0,    // Yellow
      };
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
  
      // Set the filtering mode
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  
      return texture;
  }
  
  GLuint CreateSimpleTextureCubemap()
  {
      // Generate a texture object
      GLuint texture;
      glGenTextures(1, &texture);
  
      // Bind the texture object
      glBindTexture(GL_TEXTURE_CUBE_MAP, texture);
  
      // Load the texture faces
      GLubyte pixels[6][3] = {// Face 0 - Red
                              {255, 0, 0},
                              // Face 1 - Green,
                              {0, 255, 0},
                              // Face 3 - Blue
                              {0, 0, 255},
                              // Face 4 - Yellow
                              {255, 255, 0},
                              // Face 5 - Purple
                              {255, 0, 255},
                              // Face 6 - White
                              {255, 255, 255}};
  
      for (size_t i = 0; i < 6; i++)
      {
          glTexImage2D(static_cast<GLenum>(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i), 0, GL_RGB, 1, 1, 0,
                       GL_RGB, GL_UNSIGNED_BYTE, &pixels[i]);
      }
  
      // Set the filtering mode
      glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
      glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  
      return texture;
  }
  
  GLuint CreateMipMappedTexture2D()
  {
      // Texture object handle
      const size_t width  = 256;
      const size_t height = 256;
      std::array<GLubyte, width * height * 3> pixels;
  
      const size_t checkerSize = 8;
      for (size_t y = 0; y < height; y++)
      {
          for (size_t x = 0; x < width; x++)
          {
              GLubyte rColor = 0;
              GLubyte bColor = 0;
  
              if ((x / checkerSize) % 2 == 0)
              {
                  rColor = 255 * ((y / checkerSize) % 2);
                  bColor = 255 * (1 - ((y / checkerSize) % 2));
              }
              else
              {
                  bColor = 255 * ((y / checkerSize) % 2);
                  rColor = 255 * (1 - ((y / checkerSize) % 2));
              }
  
              pixels[(y * height + x) * 3]     = rColor;
              pixels[(y * height + x) * 3 + 1] = 0;
              pixels[(y * height + x) * 3 + 2] = bColor;
          }
      }
  
      // Generate a texture object
      GLuint texture;
      glGenTextures(1, &texture);
  
      // Bind the texture object
      glBindTexture(GL_TEXTURE_2D, texture);
  
      // Load mipmap level 0
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE,
                   pixels.data());
  
      // Generate mipmaps
      glGenerateMipmap(GL_TEXTURE_2D);
  
      // Set the filtering mode
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  
      return texture;
  }
  

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