src/client/texture.c

   1 #define STB_IMAGE_IMPLEMENTATION
   2 #include <stb/stb_image.h>
   3 #include <stdbool.h>
   4 #include "client/texture.h"
   5 #include "list.h"
   6 #include "util.h"
   7
   8 static List textures;
   9
  10 __attribute((constructor(101))) static void textures_init()
  11 {
  12         stbi_set_flip_vertically_on_load(true);
  13
  14         textures = list_create(&list_compare_string);
  15 }
  16
  17 static void list_delete_texture(unused void *key, void *value, unused void *arg)
  18 {
  19         texture_delete(value);
  20 }
  21
  22 __attribute((destructor)) static void textures_deinit()
  23 {
  24         list_clear_func(&textures, &list_delete_texture, NULL);
  25 }
  26
  27 Texture *texture_create(unsigned char *data, int width, int height, GLenum format)
  28 {
  29         Texture *texture = malloc(sizeof(Texture));
  30         texture->width = width;
  31         texture->height = height;
  32
  33         glGenTextures(1, &texture->id);
  34
  35         glBindTexture(GL_TEXTURE_2D, texture->id);
  36
  37         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
  38         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  39         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  40         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
  41
  42         glTexImage2D(GL_TEXTURE_2D, 0, format, texture->width, texture->height, 0, format, GL_UNSIGNED_BYTE, data);
  43         glGenerateMipmap(GL_TEXTURE_2D);
  44
  45         glBindTexture(GL_TEXTURE_2D, 0);
  46
  47         return texture;
  48 }
  49
  50 void texture_delete(Texture *texture)
  51 {
  52         glDeleteTextures(1, &texture->id);
  53         free(texture);
  54 }
  55
  56 static void *create_image_texture(void *key)
  57 {
  58         int width, height, channels;
  59
  60         unsigned char *data = stbi_load(key, &width, &height, &channels, 0);
  61         if (! data) {
  62                 printf("Failed to load texture %s\n", (char *) key);
  63                 return 0;
  64         }
  65
  66         Texture *texture = texture_create(data, width, height, GL_RGBA);
  67
  68         stbi_image_free(data);
  69
  70         return texture;
  71 }
  72
  73 Texture *texture_get(char *path)
  74 {
  75         return list_get_cached(&textures, path, &create_image_texture);
  76 }