TextureArray::TextureArray(std::vector<std::string> path, bool mipmap)
: TextureBase()
, _num(path.size())
, _texture(0) {
if ( path.size() == 0 ){
fprintf(stderr, "TextureArray must have at least one image, got 0.\n");
path.push_back("default.jpg");
_num++;
}
/* hack to get size */
{
SDL_Surface* surface = load_image(path[0], &size);
SDL_FreeSurface(surface);
}
fprintf(verbose, "Creating TextureArray with %zd images at %dx%d\n", path.size(), size.x, size.y);
glGenTextures(1, &_texture);
glBindTexture(GL_TEXTURE_2D_ARRAY, _texture);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
if ( mipmap ){
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_GENERATE_MIPMAP, GL_TRUE);
} else {
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_GENERATE_MIPMAP, GL_FALSE);
}
glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA, size.x, size.y, num_textures(), 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
int n = 0;
for ( const std::string& filename: path) {
glm::ivec2 cur_size;
SDL_Surface* surface = load_image(filename, &cur_size);
glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, n++, cur_size.x, cur_size.y, 1, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels);
checkForGLErrors(("Texture2DArray: glTexSubImage3D ( " + filename + ")").c_str());
SDL_FreeSurface(surface);
}
glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
checkForGLErrors("Texture2DArray: Create");
}
StringId64 get_texture_id(const PackageResource* pr, uint32_t i)
{
CE_ASSERT(i < num_textures(pr), "Index out of bounds");
StringId64* begin = (StringId64*) ((char*)pr + pr->textures_offset);
return begin[i];
}