<![CDATA[Tilengine - The 2D retro graphics engine forum - All Forums]]> http://tilengine.org/forum/ Sun, 05 Apr 2026 12:00:41 +0000 MyBB <![CDATA[sqx specifications]]> http://tilengine.org/forum/showthread.php?tid=2311 Thu, 03 Apr 2025 14:23:33 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2311
How does it work and what are the tags I can use? Can I use seconds instead of frames? And can I set an individual delay per sequence frame?

Thanks for your answer!]]>
How does it work and what are the tags I can use? Can I use seconds instead of frames? And can I set an individual delay per sequence frame?

Thanks for your answer!]]> <![CDATA[Layer Masking]]> http://tilengine.org/forum/showthread.php?tid=2310 Sat, 08 Mar 2025 18:59:56 +0000 sputnikus]]> http://tilengine.org/forum/showthread.php?tid=2310
I was wondering if Tilengine has a layer masking feature similar to TLN_SetLayerClip, but where pixels would be clipped based on the assigned layer mask rather than rectangular bounds.

At a high level, I was thinking that any given layer could be assigned a "layer mask," and when drawing pixels, we could test against this assigned layer mask to see if the pixel should be drawn or not.

I'm working on adding shadows and overlay effects to my game, and many of the effects I'm considering would require masking parts of a layer to ensure they are drawn within the bounds of the sprites on the layer below.

Here is a video recording of the effects I am working with, I would essentially like to clip all of the shadows within the chessboard's bounds:
[Image: 1PvlVcwXIKldUg3FLLSfFOkFqypwaABLq=w1000?authuser=0]

Thank you!]]>
I was wondering if Tilengine has a layer masking feature similar to TLN_SetLayerClip, but where pixels would be clipped based on the assigned layer mask rather than rectangular bounds.

At a high level, I was thinking that any given layer could be assigned a "layer mask," and when drawing pixels, we could test against this assigned layer mask to see if the pixel should be drawn or not.

I'm working on adding shadows and overlay effects to my game, and many of the effects I'm considering would require masking parts of a layer to ensure they are drawn within the bounds of the sprites on the layer below.

Here is a video recording of the effects I am working with, I would essentially like to clip all of the shadows within the chessboard's bounds:
[Image: 1PvlVcwXIKldUg3FLLSfFOkFqypwaABLq=w1000?authuser=0]

Thank you!]]> <![CDATA[[Bug?] Disable Layer and Raster Callbacks]]> http://tilengine.org/forum/showthread.php?tid=2309 Sat, 08 Feb 2025 23:40:17 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2309 If I have a raster callback interacting with a layer, but I disable this layer somewhere else in the code, the layer is still enabled. Is this behavior normal? Wouldn't it cause problems if I want to keep it disabled for some reasons?
Thanks for your answer!]]> If I have a raster callback interacting with a layer, but I disable this layer somewhere else in the code, the layer is still enabled. Is this behavior normal? Wouldn't it cause problems if I want to keep it disabled for some reasons?
Thanks for your answer!]]> <![CDATA[Struct padding]]> http://tilengine.org/forum/showthread.php?tid=2308 Wed, 05 Feb 2025 16:55:03 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2308 Are structs automatically padded during compilation? I recommend you to order your fields by size or manually padding your fields like this :

Field ordering :
Code:
typedef struct
{

typedef struct
{
int x; /*!< horizontal position */
int y; /*!< vertical position */
int width; /*!< horizontal size */
int height; /*!< vertical size */
uint16_t id; /*!< unique ID */
uint16_t gid; /*!< graphic ID (tile index) */
uint16_t flags; /*!< attributes (FLAG_FLIPX, FLAG_FLIPY, FLAG_PRIORITY) */
uint8_t type; /*!< type property */
bool visible; /*!< visible property */
char name[64]; /*!< name property */
}
TLN_ObjectInfo;

Manual padding :
Code:
typedef struct
{
uint16_t id; /*!< unique ID */
uint16_t gid; /*!< graphic ID (tile index) */
uint16_t flags; /*!< attributes (FLAG_FLIPX, FLAG_FLIPY, FLAG_PRIORITY) */
uint16_t padding;
int x; /*!< horizontal position */
int y; /*!< vertical position */
int width; /*!< horizontal size */
int height; /*!< vertical size */
uint8_t type; /*!< type property */
bool visible; /*!< visible property */
char name[64]; /*!< name property */
}
TLN_ObjectInfo;
]]> Are structs automatically padded during compilation? I recommend you to order your fields by size or manually padding your fields like this :

Field ordering :
Code:
typedef struct
{

typedef struct
{
int x; /*!< horizontal position */
int y; /*!< vertical position */
int width; /*!< horizontal size */
int height; /*!< vertical size */
uint16_t id; /*!< unique ID */
uint16_t gid; /*!< graphic ID (tile index) */
uint16_t flags; /*!< attributes (FLAG_FLIPX, FLAG_FLIPY, FLAG_PRIORITY) */
uint8_t type; /*!< type property */
bool visible; /*!< visible property */
char name[64]; /*!< name property */
}
TLN_ObjectInfo;

Manual padding :
Code:
typedef struct
{
uint16_t id; /*!< unique ID */
uint16_t gid; /*!< graphic ID (tile index) */
uint16_t flags; /*!< attributes (FLAG_FLIPX, FLAG_FLIPY, FLAG_PRIORITY) */
uint16_t padding;
int x; /*!< horizontal position */
int y; /*!< vertical position */
int width; /*!< horizontal size */
int height; /*!< vertical size */
uint8_t type; /*!< type property */
bool visible; /*!< visible property */
char name[64]; /*!< name property */
}
TLN_ObjectInfo;
]]> <![CDATA[Duff's devices]]> http://tilengine.org/forum/showthread.php?tid=2307 Mon, 13 Jan 2025 22:20:49 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2307 I watched a video about Duff's devices today. It is sadly in french but I can send you some articles about it.
https://en.wikipedia.org/wiki/Duff%27s_device
https://www.geeksforgeeks.org/duffs-device-work/
It is very interesting, and I wonder if we can use this technique to optimize Tilengine even further. Imagine being able to draw X pixels in a single row, then do a check, without needing the window width to be a multiple of X?]]> I watched a video about Duff's devices today. It is sadly in french but I can send you some articles about it.
https://en.wikipedia.org/wiki/Duff%27s_device
https://www.geeksforgeeks.org/duffs-device-work/
It is very interesting, and I wonder if we can use this technique to optimize Tilengine even further. Imagine being able to draw X pixels in a single row, then do a check, without needing the window width to be a multiple of X?]]> <![CDATA[Global palettes bugs?]]> http://tilengine.org/forum/showthread.php?tid=2306 Fri, 10 May 2024 19:22:37 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2306
I think I found a weird bug with the global palettes.

I created 8 global palettes of size 16 and loaded the Sonic foreground tilemap. Normally, everything should be black, but here, I have some blue stuff :
When I set the size to 22, I don't have any issues.

[Image: 4aee05b80bde0edcbfa9a01443aaadf9-Full.webp]

Is that normal?
Edit : It would be a great idea if the user can disable the global palettes usage, or enable them again.
Edit 2 : Is it possible to set NULL to a Layer's tilemap / bitmap / objectlist?]]>
I think I found a weird bug with the global palettes.

I created 8 global palettes of size 16 and loaded the Sonic foreground tilemap. Normally, everything should be black, but here, I have some blue stuff :
When I set the size to 22, I don't have any issues.

[Image: 4aee05b80bde0edcbfa9a01443aaadf9-Full.webp]

Is that normal?
Edit : It would be a great idea if the user can disable the global palettes usage, or enable them again.
Edit 2 : Is it possible to set NULL to a Layer's tilemap / bitmap / objectlist?]]> <![CDATA[CRT and set FPS bugs]]> http://tilengine.org/forum/showthread.php?tid=2305 Wed, 27 Mar 2024 21:29:03 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2305
I found 2 bugs in Tilengine.

The first one is about the CRT filter. When I set a bitmap as background and a tilemap as layer, I have a strange glitch with the CRT enabled (nothing special if disabled) :
[Image: c074ae287b032a05044bcb97fe177df1-Full.webp?w=1308&h=863]

Here is the code :
Code:
#include "Tilengine.h"
#include <SDL2/SDL.h>

int main(void) {
    TLN_Tilemap foreground;

    TLN_Init (400, 240, 1, 0, 0);

    TLN_Bitmap bm = TLN_LoadBitmap("elis.bmp");
    TLN_Tilemap tm = TLN_LoadTilemap("assets/sonic/Sonic_md_fg1.tmx", NULL);
    TLN_SetBGBitmap(bm);
    TLN_SetLayerTilemap(0, tm);
    TLN_CreateWindow (NULL, CWF_S3|CWF_NOVSYNC);
    int fps = 60;
    TLN_SetTargetFps(10);
    int average_fps = 0;
    while (TLN_ProcessWindow()) {
        /* adjust game logic pacing to target fps */
        uint32_t begin = SDL_GetTicks();
TLN_DrawFrame(0);
        uint32_t end = SDL_GetTicks();
        uint32_t delta = end - begin;
        printf("FPS = %f\n", 1000.0 / (float)delta);
    }

    TLN_Deinit ();
}


The second is when I change the FPS, seems the animations of the flowers are always at the same speed. Is that normal? Shouldn't it be slower (or faster if above screen refresh rate)?

Thanks for your answer!]]>
I found 2 bugs in Tilengine.

The first one is about the CRT filter. When I set a bitmap as background and a tilemap as layer, I have a strange glitch with the CRT enabled (nothing special if disabled) :
[Image: c074ae287b032a05044bcb97fe177df1-Full.webp?w=1308&h=863]

Here is the code :
Code:
#include "Tilengine.h"
#include <SDL2/SDL.h>

int main(void) {
    TLN_Tilemap foreground;

    TLN_Init (400, 240, 1, 0, 0);

    TLN_Bitmap bm = TLN_LoadBitmap("elis.bmp");
    TLN_Tilemap tm = TLN_LoadTilemap("assets/sonic/Sonic_md_fg1.tmx", NULL);
    TLN_SetBGBitmap(bm);
    TLN_SetLayerTilemap(0, tm);
    TLN_CreateWindow (NULL, CWF_S3|CWF_NOVSYNC);
    int fps = 60;
    TLN_SetTargetFps(10);
    int average_fps = 0;
    while (TLN_ProcessWindow()) {
        /* adjust game logic pacing to target fps */
        uint32_t begin = SDL_GetTicks();
TLN_DrawFrame(0);
        uint32_t end = SDL_GetTicks();
        uint32_t delta = end - begin;
        printf("FPS = %f\n", 1000.0 / (float)delta);
    }

    TLN_Deinit ();
}


The second is when I change the FPS, seems the animations of the flowers are always at the same speed. Is that normal? Shouldn't it be slower (or faster if above screen refresh rate)?

Thanks for your answer!]]> <![CDATA[How to create a framebuffer for use of external rendering]]> http://tilengine.org/forum/showthread.php?tid=2304 Thu, 29 Feb 2024 14:54:55 +0000 raziel]]> http://tilengine.org/forum/showthread.php?tid=2304
    const int hres = 400;
    const int vres = 240;
    const int pitch = hres * sizeof(uint32_t);
    void* framebuffer;

    /* init and set framebuffer */
    TLN_Init (hres, vres, 2, 80, 0);
    framebuffer = malloc (pitch * vres);
    TLN_SetRenderTarget (framebuffer, pitch);


However on my end (visual studio 2022), TLN_SetRenderTarget's first argument (framebuffer) expects a uint8_t, not a void*, and changing framebuffer to that datatype causes malloc to break, as malloc returns a void*.
so what is it you're actually meant to do?]]>
    const int hres = 400;
    const int vres = 240;
    const int pitch = hres * sizeof(uint32_t);
    void* framebuffer;

    /* init and set framebuffer */
    TLN_Init (hres, vres, 2, 80, 0);
    framebuffer = malloc (pitch * vres);
    TLN_SetRenderTarget (framebuffer, pitch);


However on my end (visual studio 2022), TLN_SetRenderTarget's first argument (framebuffer) expects a uint8_t, not a void*, and changing framebuffer to that datatype causes malloc to break, as malloc returns a void*.
so what is it you're actually meant to do?]]> <![CDATA[How blitting works]]> http://tilengine.org/forum/showthread.php?tid=2303 Wed, 21 Feb 2024 20:28:57 +0000 vonhoff]]> http://tilengine.org/forum/showthread.php?tid=2303
I'm currently learning about blitting in graphics programming and I'm trying to understand how scaling works.
How does it work in Tilengine? The scaling I'm interested in is in the following snippet from Blitters.c
Code:
/* paints scanline without checking color key (always solid) with scaling */
static void blitFastScaling_8_32 (uint8_t *srcpixel, TLN_Palette palette, void* dstptr, int width, int dx, int offset, uint8_t* blend)
{
  uint32_t* dstpixel = (uint32_t*)dstptr;
  uint32_t* color = (uint32_t*)palette->data;
  while (width)
  {
    uint32_t src = *(srcpixel + offset/(1 << FIXED_BITS));
    *dstpixel++ = color[src];
    offset += dx;
    width--;
  }
}

I wonder why the offset is divided by (1 << 16) or 65536.

Thanks!

Edit:
As I understand it, the reason for dividing the offset by (1 << 16) is to convert it from a fixed-point representation to an integer index in the palette array. And the fixed-point representation is used to allow for fractional increments of offset, which is necessary for smooth scaling. Is that correct?]]>
I'm currently learning about blitting in graphics programming and I'm trying to understand how scaling works.
How does it work in Tilengine? The scaling I'm interested in is in the following snippet from Blitters.c
Code:
/* paints scanline without checking color key (always solid) with scaling */
static void blitFastScaling_8_32 (uint8_t *srcpixel, TLN_Palette palette, void* dstptr, int width, int dx, int offset, uint8_t* blend)
{
  uint32_t* dstpixel = (uint32_t*)dstptr;
  uint32_t* color = (uint32_t*)palette->data;
  while (width)
  {
    uint32_t src = *(srcpixel + offset/(1 << FIXED_BITS));
    *dstpixel++ = color[src];
    offset += dx;
    width--;
  }
}

I wonder why the offset is divided by (1 << 16) or 65536.

Thanks!

Edit:
As I understand it, the reason for dividing the offset by (1 << 16) is to convert it from a fixed-point representation to an integer index in the palette array. And the fixed-point representation is used to allow for fractional increments of offset, which is necessary for smooth scaling. Is that correct?]]> <![CDATA[Origin of resources]]> http://tilengine.org/forum/showthread.php?tid=2302 Thu, 07 Dec 2023 20:04:17 +0000 vonhoff]]> http://tilengine.org/forum/showthread.php?tid=2302
I was wondering where you got the resources for the samples, like the palettes, spritesets, tilesets, etc. Did you make them yourself? They look really good.]]>
I was wondering where you got the resources for the samples, like the palettes, spritesets, tilesets, etc. Did you make them yourself? They look really good.]]> <![CDATA[Collision with tiles position and sprite not aligning correctly]]> http://tilengine.org/forum/showthread.php?tid=2300 Sun, 03 Sep 2023 05:04:03 +0000 RootBeerKing]]> http://tilengine.org/forum/showthread.php?tid=2300
*removed link*

Thank you very much.]]>
*removed link*

Thank you very much.]]> <![CDATA[Vertical callback or per pixel callback : I understand/How does Tilengine work?]]> http://tilengine.org/forum/showthread.php?tid=2299 Thu, 17 Aug 2023 15:19:01 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2299
I wondered why Tilengine didn't have vertical raster effects or per pixel effects while the Commodore Amiga can do stuff each 8 pixels, or less in demos.
Well, I try to create my own graphics engine in Nim with not only horizontal raster effects, but also vertical and both at once.
Aaaand well... It hurts performances a lot. It now makes sense why that kind of feature isn't implemented.

But I wonder about another thing, how do you do to reach such high performances to draw at least a simple tilemap? I hardly go under 7ms per frame drawing for one layer and a 384x216 screen.

I also read Tilengine's code to understand how rendering is done, maybe I didn't understood well, but it seems you draw each scanlines each times as the number of layers. is it that?]]>
I wondered why Tilengine didn't have vertical raster effects or per pixel effects while the Commodore Amiga can do stuff each 8 pixels, or less in demos.
Well, I try to create my own graphics engine in Nim with not only horizontal raster effects, but also vertical and both at once.
Aaaand well... It hurts performances a lot. It now makes sense why that kind of feature isn't implemented.

But I wonder about another thing, how do you do to reach such high performances to draw at least a simple tilemap? I hardly go under 7ms per frame drawing for one layer and a 384x216 screen.

I also read Tilengine's code to understand how rendering is done, maybe I didn't understood well, but it seems you draw each scanlines each times as the number of layers. is it that?]]> <![CDATA[tile_info.type returning 0?]]> http://tilengine.org/forum/showthread.php?tid=2298 Wed, 16 Aug 2023 06:01:43 +0000 RootBeerKing]]> http://tilengine.org/forum/showthread.php?tid=2298 TLN_GetLayerTile (LAYER_FOREGROUND, 11*16,12*16, &tile_info);

the number I entered in the tile type in Tiled doesn't show up, I only get a 0 returned when I print it using std::cout << tile_info.type << std::endl;

Is this a bug, or did I do something wrong?

This is my tileset file:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<tileset version="1.10" tiledversion="1.10.2" name="tileset" tilewidth="16" tileheight="16" tilecount="240" columns="20">
<image source="tileset.png" trans="ff00ff" width="320" height="192"/>
<tile id="67" type="2">
  <properties>
  <property name="type" type="int" value="2"/>
  </properties>
</tile>
<tile id="68">
  <properties>
  <property name="type" type="int" value="1"/>
  </properties>
</tile>
<tile id="69">
  <properties>
  <property name="type" type="int" value="1"/>
  </properties>
</tile>
</tileset>
]]> TLN_GetLayerTile (LAYER_FOREGROUND, 11*16,12*16, &tile_info);

the number I entered in the tile type in Tiled doesn't show up, I only get a 0 returned when I print it using std::cout << tile_info.type << std::endl;

Is this a bug, or did I do something wrong?

This is my tileset file:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<tileset version="1.10" tiledversion="1.10.2" name="tileset" tilewidth="16" tileheight="16" tilecount="240" columns="20">
<image source="tileset.png" trans="ff00ff" width="320" height="192"/>
<tile id="67" type="2">
  <properties>
  <property name="type" type="int" value="2"/>
  </properties>
</tile>
<tile id="68">
  <properties>
  <property name="type" type="int" value="1"/>
  </properties>
</tile>
<tile id="69">
  <properties>
  <property name="type" type="int" value="1"/>
  </properties>
</tile>
</tileset>
]]> <![CDATA[Tile animation (ON/OFF switch case)]]> http://tilengine.org/forum/showthread.php?tid=2297 Sat, 05 Aug 2023 21:55:34 +0000 System64]]> http://tilengine.org/forum/showthread.php?tid=2297
I am trying to make an ON/OFF switch gimmick like what you can find in Super Mario Maker 2 :


In my case, the state of the switch is stored in a Boolean variable.
The best way to achieve this effect I think is through animations. However, I can't find a way to control animations to achieve this effect.
The way I achieved the gimmick is by iterating through THE ENTIRE TILEMAP and change the index of the tiles I want to switch, so, very unoptimized.

Do you know how I can achieve that?
Thanks for your answer!]]>
I am trying to make an ON/OFF switch gimmick like what you can find in Super Mario Maker 2 :


In my case, the state of the switch is stored in a Boolean variable.
The best way to achieve this effect I think is through animations. However, I can't find a way to control animations to achieve this effect.
The way I achieved the gimmick is by iterating through THE ENTIRE TILEMAP and change the index of the tiles I want to switch, so, very unoptimized.

Do you know how I can achieve that?
Thanks for your answer!]]> <![CDATA[Forum online again]]> http://tilengine.org/forum/showthread.php?tid=2296 Sat, 05 Aug 2023 08:13:50 +0000 megamarc]]> http://tilengine.org/forum/showthread.php?tid=2296
Forum has been offline since some days ago. Database reached file size limit of 3 Gb imposed by my ISP (Hostinger). Instead of sending an alert email, they locked database access to the forum application. Thanks God I'm a sysadmin myself and I'm used to tinker with SQL databases, so I shrunk the database size -most of the size was taken by ancent session logs and other disposable stuff. However access was still locked. I contacted them for help, as the database was inside allowed parameters and I could access it remotely without problem. They opened a support ticket but said that it could take long to fix. So I dumped the locked databse, created a new one with another username, changed myBB config to point to the new one, and voila! Forum online again.

I'm seriously thinking about moving my hosting from managed provider to self-administered AWS account, as I already have experience with this platform.

Sorry for the inconveniences this downtime may have caused.]]>
Forum has been offline since some days ago. Database reached file size limit of 3 Gb imposed by my ISP (Hostinger). Instead of sending an alert email, they locked database access to the forum application. Thanks God I'm a sysadmin myself and I'm used to tinker with SQL databases, so I shrunk the database size -most of the size was taken by ancent session logs and other disposable stuff. However access was still locked. I contacted them for help, as the database was inside allowed parameters and I could access it remotely without problem. They opened a support ticket but said that it could take long to fix. So I dumped the locked databse, created a new one with another username, changed myBB config to point to the new one, and voila! Forum online again.

I'm seriously thinking about moving my hosting from managed provider to self-administered AWS account, as I already have experience with this platform.

Sorry for the inconveniences this downtime may have caused.]]>