src/dragonblocks/texture.cpp

   1 #include <stdexcept>
   2 #define STB_IMAGE_IMPLEMENTATION
   3 #include "stb_image.h"
   4 #include "gldebug.hpp"
   5 #include "log.hpp"
   6 #include "texture.hpp"
   7
   8 using namespace std;
   9 using namespace dragonblocks;
  10
  11 bool Texture::mipmap;
  12 bool Texture::bilinear_filter;
  13 GLenum Texture::min_filter, Texture::mag_filter;
  14
  15 void Texture::initArgs()
  16 {
  17         min_filter = mag_filter = bilinear_filter ? GL_LINEAR : GL_NEAREST;
  18         if (mipmap) {
  19                 if (min_filter == GL_NEAREST) {
  20                         min_filter = GL_NEAREST_MIPMAP_NEAREST;
  21                 } else {
  22                         min_filter = GL_LINEAR_MIPMAP_NEAREST;
  23                 }
  24         }
  25         stbi_set_flip_vertically_on_load(true);
  26 }
  27
  28 void Texture::bind() const
  29 {
  30         glBindTexture(GL_TEXTURE_2D, id); CHECKERR
  31 }
  32
  33 void Texture::load(const string &path)
  34 {
  35         int width, height, nrChannels;
  36         unsigned char *data = stbi_load(path.c_str(), &width, &height, &nrChannels, 0);
  37         if (! data)
  38                 throw runtime_error("Failed to load texture " + path);
  39         glGenTextures(1, &id); CHECKERR
  40         bind();
  41         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Texture::min_filter); CHECKERR
  42         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Texture::mag_filter); CHECKERR
  43         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); CHECKERR
  44         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); CHECKERR
  45         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); CHECKERR
  46         if (Texture::mipmap)
  47                 glGenerateMipmap(GL_TEXTURE_2D); CHECKERR
  48         stbi_image_free(data);
  49         glBindTexture(GL_TEXTURE_2D, 0); CHECKERR
  50         log("Loaded texture " + path);
  51 }
  52