src/texture.cpp

   1 #include <iostream>
   2 #include <stdexcept>
   3 #define STB_IMAGE_IMPLEMENTATION
   4 #include "stb_image.h"
   5 #include "texture.hpp"
   6
   7 using namespace std;
   8 using namespace dragonblocks;
   9
  10 bool Texture::mipmap;
  11 bool Texture::bilinear_filter;
  12 GLenum Texture::min_filter, Texture::mag_filter;
  13
  14 void Texture::initArgs()
  15 {
  16         min_filter = mag_filter = bilinear_filter ? GL_LINEAR : GL_NEAREST;
  17         if (mipmap) {
  18                 if (min_filter == GL_NEAREST) {
  19                         min_filter = GL_NEAREST_MIPMAP_NEAREST;
  20                 } else {
  21                         min_filter = GL_LINEAR_MIPMAP_NEAREST;
  22                 }
  23         }
  24         stbi_set_flip_vertically_on_load(true);
  25 }
  26
  27 void Texture::bind() const
  28 {
  29         glBindTexture(GL_TEXTURE_2D, id); CHECKERR
  30 }
  31
  32 void Texture::load(const string &path)
  33 {
  34         int width, height, nrChannels;
  35         unsigned char *data = stbi_load(path.c_str(), &width, &height, &nrChannels, 0);
  36         if (! data)
  37                 throw runtime_error("Failed to load texture " + path);
  38         glGenTextures(1, &id); CHECKERR
  39         bind();
  40         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Texture::min_filter); CHECKERR
  41         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Texture::mag_filter); CHECKERR
  42         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); CHECKERR
  43         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); CHECKERR
  44         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); CHECKERR
  45         if (Texture::mipmap)
  46                 glGenerateMipmap(GL_TEXTURE_2D); CHECKERR
  47         stbi_image_free(data);
  48         glBindTexture(GL_TEXTURE_2D, 0); CHECKERR
  49         cout << "Loaded texture " << path << endl;
  50 }
  51