MCDV/Texture.hpp

   1 #pragma once
   2 #include <string>
   3 #include <iostream>
   4 #include <string>
   5
   6 #include <glad\glad.h>
   7 #include <GLFW\glfw3.h>
   8
   9 #define STB_IMAGE_IMPLEMENTATION
  10 #include "stb_image.h"
  11
  12
  13 class Texture
  14 {
  15 public:
  16         unsigned int texture_id;
  17         Texture(std::string filepath, bool clamp = false);
  18
  19         void bind();
  20         void bindOnSlot(int slot);
  21
  22         ~Texture();
  23 };
  24
  25
  26
  27 bool USE_DEBUG2 = false;
  28
  29
  30 Texture::Texture(std::string filepath, bool clamp)
  31 {
  32         stbi_set_flip_vertically_on_load(true);
  33
  34         glGenTextures(1, &this->texture_id);
  35
  36         //Load texture using stb_image
  37         int width, height, nrChannels;
  38         unsigned char* data = stbi_load(filepath.c_str(), &width, &height, &nrChannels, 0);
  39         if (data)
  40         {
  41                 GLenum format;
  42                 if (nrChannels == 1)
  43                         format = GL_RED;
  44                 else if (nrChannels == 3)
  45                         format = GL_RGB;
  46                 else if (nrChannels == 4)
  47                         format = GL_RGBA;
  48
  49                 glBindTexture(GL_TEXTURE_2D, this->texture_id);
  50                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, format, GL_UNSIGNED_BYTE, data);
  51                 glGenerateMipmap(GL_TEXTURE_2D);
  52
  53                 if (!clamp) {
  54                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  55                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
  56                 }
  57                 else {
  58                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  59                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  60                 }
  61                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  62                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  63
  64                 //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
  65                 //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  66
  67                 stbi_image_free(data);
  68
  69                 if (USE_DEBUG2)
  70                 {
  71                         std::cout << "Texture loaded, info:" << std::endl;
  72                         std::cout << filepath << std::endl;
  73                         std::cout << "width: " << width << std::endl;
  74                         std::cout << "height: " << height << std::endl;
  75                 }
  76                 else
  77                 {
  78                         std::cout << "Loading texture: " << filepath << std::endl;
  79                 }
  80         }
  81         else
  82         {
  83                 std::cout << "ERROR::IMAGE::LOAD_FAILED" << std::endl;
  84         }
  85 }
  86
  87 Texture::~Texture()
  88 {
  89 }
  90
  91 void Texture::bind()
  92 {
  93         glBindTexture(GL_TEXTURE_2D, this->texture_id);
  94 }
  95
  96 void Texture::bindOnSlot(int slot = 0) {
  97         glActiveTexture(GL_TEXTURE0 + slot);
  98         glBindTexture(GL_TEXTURE_2D, this->texture_id);
  99 }