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#include "core/pch.hh"
#include "core/resource/image.hh"
#include "core/resource/resource.hh"
#include "core/io/physfs.hh"
static int stbi_physfs_read(void* context, char* data, int size)
{
return static_cast<int>(PHYSFS_readBytes(reinterpret_cast<PHYSFS_File*>(context), data, size));
}
static void stbi_physfs_skip(void* context, int count)
{
auto file = reinterpret_cast<PHYSFS_File*>(context);
PHYSFS_seek(file, PHYSFS_tell(file) + count);
}
static int stbi_physfs_eof(void* context)
{
return PHYSFS_eof(reinterpret_cast<PHYSFS_File*>(context));
}
static const void* image_load_func(const char* name, std::uint32_t flags)
{
assert(name);
stbi_io_callbacks callbacks;
callbacks.read = &stbi_physfs_read;
callbacks.skip = &stbi_physfs_skip;
callbacks.eof = &stbi_physfs_eof;
stbi_set_flip_vertically_on_load(bool(flags & IMAGE_LOAD_FLIP));
auto file = PHYSFS_openRead(name);
if(file == nullptr) {
spdlog::error("image: {}: {}", name, physfs_error());
return nullptr;
}
int desired_channels;
if(flags & IMAGE_LOAD_GRAY) {
desired_channels = STBI_grey;
}
else {
desired_channels = STBI_rgb_alpha;
}
int width, height, channels;
auto pixels = stbi_load_from_callbacks(&callbacks, file, &width, &height, &channels, desired_channels);
PHYSFS_close(file);
if(pixels == nullptr) {
spdlog::error("image: {}: {}", name, stbi_failure_reason());
return nullptr;
}
auto image = new Image;
image->pixels = pixels;
image->size = glm::ivec2(width, height);
return image;
}
static void image_free_func(const void* resource)
{
assert(resource);
auto image = reinterpret_cast<const Image*>(resource);
stbi_image_free(image->pixels);
delete image;
}
void Image::register_resource(void)
{
resource::register_loader<Image>(&image_load_func, &image_free_func);
}
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