C2048/texture.c

#include "glad/gl.h"
#include "stb_image.h"

#include "core.h"
#include "texture.h"

TextureId load_texture(const char *path) {
  int width, height, nrChannels;
  unsigned char *data = stbi_load(path, &width, &height, &nrChannels, STBI_rgb_alpha);
  GLuint texture_id;

  u32 format = GL_RGBA;

  switch (nrChannels) {
    case 1:
      format = GL_RED;
      break;
    case 2:
      format = GL_RG;
      break;
    case 3:
      format = GL_RGB;
      break;
    case 4:
      format = GL_RGBA;
      break;
  }

  glGenTextures(1, &texture_id);
  glBindTexture(GL_TEXTURE_2D, texture_id);

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);

  glGenerateMipmap(GL_TEXTURE_2D);

  stbi_image_free(data);

  return texture_id;
}