minecraft

minecraft
git clone git://git.evenfri.pw/minecraft.git
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blocks.c (2529B)

      1 #include "minecraft.h"
      2 #include "stb_image.h"
      3 
      4 Block_t blocks[] = {
      5   { BLOCK_GRASS, {
      6                    "assets/grass_side.png", /* back   */
      7                    "assets/grass_side.png", /* front  */
      8                    "assets/grass_side.png", /* left   */
      9                    "assets/grass_side.png", /* right  */
     10                    "assets/dirt.png", /* bottom */
     11                    "assets/grass_top.png",  /* top    */
     12                  }},
     13   { BLOCK_STONE, {
     14                    "assets/stone.png", "assets/stone.png",
     15                    "assets/stone.png", "assets/stone.png",
     16                    "assets/stone.png", "assets/stone.png",
     17                  }},
     18   { BLOCK_DIRT, {
     19                   "assets/dirt.png", "assets/dirt.png",
     20                   "assets/dirt.png", "assets/dirt.png",
     21                   "assets/dirt.png", "assets/dirt.png",
     22                 }},
     23 };
     24 int block_count = sizeof(blocks) / sizeof(blocks[0]);
     25 
     26 static unsigned int *block_textures = NULL;
     27 
     28 static unsigned int load_texture(const char *path) {
     29   unsigned int tex;
     30   glGenTextures(1, &tex);
     31   glBindTexture(GL_TEXTURE_2D, tex);
     32   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     33   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     34   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     35   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     36   int w, h, nrChannels;
     37   stbi_set_flip_vertically_on_load(true);
     38   unsigned char *data = stbi_load(path, &w, &h, &nrChannels, 0);
     39   if (!data) {
     40     printf("err: failed to load texture %s\n", path);
     41     return 0;
     42   }
     43   GLenum fmt = (nrChannels == 4) ? GL_RGBA
     44     : (nrChannels == 3) ? GL_RGB
     45     : GL_RED;
     46   glTexImage2D(GL_TEXTURE_2D, 0, fmt, w, h, 0, fmt,
     47       GL_UNSIGNED_BYTE, data);
     48   glGenerateMipmap(GL_TEXTURE_2D);
     49   stbi_image_free(data);
     50   return tex; 
     51 }
     52 
     53 void blocks_init(void) {
     54   block_textures = malloc(sizeof(unsigned int) * block_count * FACE_COUNT);
     55   for (int i = 0; i < block_count; i++)
     56     for (int f = 0; f < FACE_COUNT; f++)
     57       block_textures[i * FACE_COUNT + f] =
     58         load_texture(blocks[i].texture_paths[f]);
     59 }
     60 
     61 void blocks_end(void) {
     62   if (block_textures) {
     63     glDeleteTextures(block_count * FACE_COUNT, block_textures);
     64     free(block_textures);
     65     block_textures = NULL;
     66   }
     67 }
     68 
     69 unsigned int block_texture(unsigned int id, int face) {
     70   if (face < 0 || face >= FACE_COUNT) return 0;
     71   for (int i = 0; i < block_count; i++)
     72     if (blocks[i].id == id)
     73       return block_textures[i * FACE_COUNT + face];
     74   return 0;
     75 }