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feely_pona/feely_pona_sprite_packer.cpp

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#define DQN_ASAN_POISON 1
#define DQN_ASAN_VET_POISON 1
#define DQN_ONLY_RECT
#define DQN_ONLY_WIN
#define DQN_ONLY_V2
#define DQN_ONLY_SLICE
#define DQN_ONLY_SARRAY
#define DQN_ONLY_DSMAP
#define DQN_ONLY_LIST
#define DQN_ONLY_FS
#define DQN_ONLY_SEMAPHORE
#define DQN_ONLY_THREAD
#define _CRT_SECURE_NO_WARNINGS
#define DQN_IMPLEMENTATION
#include "External/tely/External/dqn/dqn.h"
DQN_MSVC_WARNING_PUSH
DQN_MSVC_WARNING_DISABLE(4244) // warning C4244: 'argument': conversion from 'int' to 'short', possible loss of data
#define STB_RECT_PACK_IMPLEMENTATION
#include "External/tely/External/stb/stb_rect_pack.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "External/tely/External/stb/stb_image_write.h"
#define STB_IMAGE_IMPLEMENTATION
#include "External/tely/External/stb/stb_image.h"
DQN_MSVC_WARNING_POP
DQN_MSVC_WARNING_PUSH
DQN_MSVC_WARNING_DISABLE(4244) // External\strnatcmp.c|58| warning C4244: 'return': conversion from 'int' to 'nat_char', possible loss of data
DQN_MSVC_WARNING_DISABLE(4702) // External\strnatcmp.c|110 warning| C4702: unreachable code
#include "External/strnatcmp.h"
#include "External/strnatcmp.c"
DQN_MSVC_WARNING_POP
struct SpriteSpecification
{
uint16_t frame_count;
uint16_t frames_per_second;
};
static Dqn_Str8 SpriteAnimNameFromFilePath(Dqn_Str8 path)
{
// NOTE: Enumerate the number of frames for this animation =================================
Dqn_Str8 file_name = Dqn_Str8_FileNameFromPath(path);
Dqn_Str8 file_name_without_extension = Dqn_Str8_BinarySplit(file_name, DQN_STR8(".")).lhs;
// NOTE: If the sprite is a standalone sprite without any frame suffix (e.g. "_1.png") then
// we accept the entry as the name of the sprite as is.
Dqn_Str8 result = {};
if (Dqn_Char_IsDigit(file_name_without_extension.data[file_name_without_extension.size - 1])) {
Dqn_Str8BinarySplitResult split = Dqn_Str8_BinarySplitReverse(file_name_without_extension, DQN_STR8("_"));
result = split.lhs;
} else {
result = file_name_without_extension;
}
return result;
}
int main(int argc, char const *argv[])
{
Dqn_Library_Init(Dqn_LibraryOnInit_Nil);
Dqn_ThreadScratch scratch = Dqn_Thread_GetScratch(nullptr);
if (argc != 4) {
Dqn_Log_InfoF("USAGE: feely_pona_sprite_packer <width>x<height> <sprite_spec.txt> <sprite directory>");
return -1;
}
// NOTE: Verify some arguments =================================================================
Dqn_Str8 atlas_dimensions = Dqn_Str8_InitCStr8(argv[1]);
Dqn_Str8 sprite_spec_path = Dqn_Str8_InitCStr8(argv[2]);
Dqn_Str8 dir = Dqn_Str8_InitCStr8(argv[3]);
if (!Dqn_Fs_Exists(sprite_spec_path)) {
Dqn_Log_ErrorF("Sprite specification file does not exist, we tried to find \"%.*s\" but it does not exist", DQN_STR_FMT(sprite_spec_path));
return -1;
}
if (!Dqn_Fs_DirExists(dir)) {
Dqn_Log_ErrorF("Directory to load sprites from does not exist, we tried to find \"%.*s\" but it does not exist", DQN_STR_FMT(dir));
return -1;
}
// NOTE: Parse the atlas size ==================================================================
Dqn_V2I atlas_size = {};
{
Dqn_Str8BinarySplitResult atlas_dimensions_split = Dqn_Str8_BinarySplit(atlas_dimensions, DQN_STR8("x"));
Dqn_Str8ToU64Result width = Dqn_Str8_ToU64(atlas_dimensions_split.lhs, 0);
Dqn_Str8ToU64Result height = Dqn_Str8_ToU64(atlas_dimensions_split.rhs, 0);
if (!width.success || width.value == 0) {
Dqn_Log_ErrorF("Width for the sprite atlas was not a number > 0");
return -1;
}
if (!height.success || height.value == 0) {
Dqn_Log_ErrorF("Width for the sprite atlas was not a number > 0");
return -1;
}
atlas_size.x = DQN_CAST(uint32_t)width.value;
atlas_size.y = DQN_CAST(uint32_t)height.value;
}
// NOTE: Parse the sprite specifications =======================================================
Dqn_DSMap<SpriteSpecification> sprite_spec_table = Dqn_DSMap_Init<SpriteSpecification>(1024);
{
Dqn_ThreadScratch inner_scratch = Dqn_Thread_GetScratch(scratch.arena);
Dqn_Str8 sprite_spec_buffer = Dqn_Fs_Read(sprite_spec_path, inner_scratch.allocator);
Dqn_Str8SplitAllocResult sprite_spec_lines = Dqn_Str8_SplitAlloc(inner_scratch.allocator, sprite_spec_buffer, DQN_STR8("\n"));
DQN_FOR_UINDEX(line_index, sprite_spec_lines.size) {
Dqn_Str8 line = Dqn_Str8_TrimWhitespaceAround(sprite_spec_lines.data[line_index]);
if (line.size == 0) // NOTE: Support empty lines, just ignore them
continue;
Dqn_Str8SplitAllocResult line_parts = Dqn_Str8_SplitAlloc(inner_scratch.allocator, line, DQN_STR8(";"));
DQN_ASSERTF(line_parts.size == 2, "Line must have 2 parts in the sprite specification\n"
"\n"
"<animation name>;<frames per second>\\n\n"
"\n"
"Line was '%.*s' loaded from '%.*s'", DQN_STR_FMT(line), DQN_STR_FMT(sprite_spec_path));
Dqn_Str8 anim_name = line_parts.data[0];
Dqn_Str8ToU64Result frames_per_second = Dqn_Str8_ToU64(line_parts.data[1], 0);
DQN_ASSERTF(frames_per_second.success, "Frames per second was not a convertible number, line was '%.*s'", line);
Dqn_DSMapResult<SpriteSpecification> slot = Dqn_DSMap_MakeKeyStr8Copy(&sprite_spec_table, scratch.allocator, anim_name);
slot.value->frames_per_second = DQN_CAST(uint16_t)frames_per_second.value;
}
}
// NOTE: Get the list of files =================================================================
Dqn_List<Dqn_Str8> file_list_raw = Dqn_List_Init<Dqn_Str8>(scratch.arena, 128);
for (Dqn_Win_FolderIterator it = {}; Dqn_Win_FolderIterate(dir, &it); ) {
if (Dqn_Str8_EndsWithInsensitive(it.file_name, DQN_STR8(".png"))) {
Dqn_Str8 *item = Dqn_List_Make(&file_list_raw, Dqn_ZeroMem_Yes);
*item = Dqn_FsPath_ConvertF(scratch.arena, "%.*s/%.*s", DQN_STR_FMT(dir), DQN_STR_FMT(it.file_name));
}
}
// NOTE: Sort the list of files ================================================================
if (file_list_raw.count == 0) {
Dqn_Log_InfoF("There are no '.png' files in the directory '%.*s' to create an atlas from, exiting", DQN_STR_FMT(dir));
return 0;
}
// NOTE: Bubble sort the file list naturally ===================================================
Dqn_Slice<Dqn_Str8> file_list = Dqn_List_ToSliceCopy(&file_list_raw, scratch.arena);
for (bool swapped = true; swapped; ) {
swapped = false;
for (Dqn_usize list_index = 0; list_index < file_list.size - 1; list_index++) {
Dqn_Str8 left = file_list.data[list_index + 0];
Dqn_Str8 right = file_list.data[list_index + 1];
if (strnatcmp(left.data, right.data) > 0) {
DQN_SWAP(file_list.data[list_index + 0], file_list.data[list_index + 1]);
swapped = true;
}
}
}
// NOTE: Setup the rect-pack state =============================================================
stbrp_node *nodes = Dqn_Arena_NewArray(scratch.arena, stbrp_node, file_list.size, Dqn_ZeroMem_Yes);
stbrp_context pack_context = {};
stbrp_init_target(&pack_context, atlas_size.w, atlas_size.h, nodes, DQN_CAST(int)file_list.size);
// NOTE: Load the sprites to determine their dimensions for rect packing =======================
Dqn_SArray<stbrp_rect> rects = Dqn_SArray_Init<stbrp_rect>(scratch.arena, file_list.size, Dqn_ZeroMem_Yes);
for (Dqn_Str8 it : file_list) {
int x = 0, y = 0, channels_in_file = 0;
stbi_uc *pixels = stbi_load(it.data, &x, &y, &channels_in_file, 4 /*desired_channels*/);
DQN_ASSERT(pixels);
stbi_image_free(pixels);
// NOTE: Add a rect to the packing context =================================================
stbrp_rect *rect = Dqn_SArray_Make(&rects, Dqn_ZeroMem_Yes);
rect->w = x;
rect->h = y;
// NOTE: Enumerate the number of frames for this animation =================================
Dqn_Str8 anim_prefix = SpriteAnimNameFromFilePath(it);
Dqn_Str8 file_name = Dqn_Str8_FileNameFromPath(it);
DQN_ASSERTF(!Dqn_Str8_HasChar(file_name, ';'),
"\n\nSprite frame loaded from file\n"
" '%.*s'\n"
"\n"
"however the file name has a semicolon which is not supported because we use a semicolon to delimit our sprite specification",
DQN_STR_FMT(file_name));
Dqn_DSMapResult<SpriteSpecification> slot = Dqn_DSMap_FindKeyStr8(&sprite_spec_table, anim_prefix);
DQN_ASSERTF(slot.found,
"\n\nSprite frame loaded from file\n"
" '%.*s'\n"
"\n"
"however there's no corresponding entry in the specification file loaded at\n"
" '%.*s'\n"
"\n"
"Add a line in format of <animation name>;<frames_per_second> to the file, e.g.\n"
" %.*s;8\n",
DQN_STR_FMT(it),
DQN_STR_FMT(sprite_spec_path),
DQN_STR_FMT(anim_prefix));
slot.value->frame_count++;
Dqn_Log_InfoF("Packing sprite: %.*s", DQN_STR_FMT(it));
}
// NOTE: Pack the rects ========================================================================
if (stbrp_pack_rects(&pack_context, rects.data, DQN_CAST(int)rects.size) != 1) {
Dqn_Log_ErrorF("STB rect pack failed to pack font rects into rectangle [width=%d, height=%d, num_rects=%d]",
atlas_size.w,
atlas_size.h,
file_list.size);
return -1;
}
// NOTE: Load the files once more and generate the final image =================================
int final_bpp = 4;
int final_image_stride = atlas_size.w * final_bpp;
char *final_image = Dqn_Arena_NewArray(scratch.arena, char, atlas_size.h * final_image_stride, Dqn_ZeroMem_Yes);
Dqn_Str8 atlas_path = Dqn_Str8_InitF(scratch.allocator, "%.*s.png", DQN_STR_FMT(dir));
// NOTE: Generate the meta file ================================================================
// NOTE: Count the number of animations we loaded frames fore
Dqn_usize num_anims = 0;
Dqn_usize num_anim_rects = 0;
for (Dqn_usize index = 1 /*Sentinel*/; index < sprite_spec_table.occupied; index++) {
Dqn_DSMapSlot<SpriteSpecification> *slot = sprite_spec_table.slots + index;
if (slot->value.frame_count) {
num_anims++;
num_anim_rects += slot->value.frame_count;
}
}
Dqn_Str8 meta_path = Dqn_Str8_InitF(scratch.allocator, "%.*s.txt", DQN_STR_FMT(dir));
Dqn_FsFile meta_file = Dqn_Fs_OpenFile(meta_path, Dqn_FsFileOpen_CreateAlways, Dqn_FsFileAccess_Write);
Dqn_Fs_WriteFileF(&meta_file,
"@file;%.*s;%d;%d\n",
DQN_STR_FMT(Dqn_Str8_FileNameFromPath(atlas_path)),
DQN_CAST(int) num_anim_rects,
DQN_CAST(int) num_anims);
Dqn_Log_InfoF("Generating meta file: %.*s", DQN_STR_FMT(meta_path));
Dqn_Str8 active_anim_prefix = {};
DQN_FOR_UINDEX (file_list_index, file_list.size) {
Dqn_Str8 it = file_list.data[file_list_index];
int w, h, channels_in_file;
stbi_uc *loaded_image = stbi_load(it.data, &w, &h, &channels_in_file, 4 /*desired_channels*/);
stbrp_rect packed_rect = rects.data[file_list_index];
char *src = DQN_CAST(char *)loaded_image;
// NOTE: Generate the image ================================================================
for (int y = 0; y < packed_rect.h; y++) {
char *row = final_image + ((packed_rect.y + y) * final_image_stride) + (packed_rect.x * final_bpp);
for (int x = 0; x < packed_rect.w; x++) {
*row++ = *src++;
*row++ = *src++;
*row++ = *src++;
*row++ = *src++;
}
}
stbi_image_free(loaded_image);
// NOTE: Detect what animation we are currently processing =================================
Dqn_Str8 anim_prefix = SpriteAnimNameFromFilePath(it);
if (active_anim_prefix.size == 0 || active_anim_prefix != anim_prefix) {
// NOTE: Anim prefix is different, we are starting a new animation- mark it accordingly
active_anim_prefix = anim_prefix;
Dqn_DSMapResult<SpriteSpecification> slot = Dqn_DSMap_FindKeyStr8(&sprite_spec_table, active_anim_prefix);
Dqn_Fs_WriteFileF(&meta_file, "@anim;%.*s;%u;%u\n", DQN_STR_FMT(active_anim_prefix), slot.value->frames_per_second, slot.value->frame_count);
}
// NOTE: Write the sprite rectangles in ====================================================
Dqn_Str8 file_name = Dqn_Str8_FileNameFromPath(it);
Dqn_Fs_WriteFileF(&meta_file, "%d;%d;%d;%d;%.*s", packed_rect.x, packed_rect.y, packed_rect.w, packed_rect.h, DQN_STR_FMT(file_name));
if (file_list_index != (file_list.size - 1))
Dqn_Fs_WriteFileF(&meta_file, "\n");
}
Dqn_Log_InfoF("Generating atlas: %.*s", DQN_STR_FMT(atlas_path));
stbi_write_png(atlas_path.data, atlas_size.w, atlas_size.h, 4, final_image, final_image_stride);
return 0;
}
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