SpritesMind.Net

For an SGDK example of how to change colors each scan line you can have a look here:

https://github.com/a-dietrich/SEGA-Gene ... e/main/tf2

In src/main.c look for scene4().

I made a Genesis port of the Thunder Force II intro sequence from the Sharp X68000 version. The binary has been tested on a real machine. On a PAL system, graphics should be displayed at 320x240 pixels resolution, it will also work on NTSC systems (320x228 pixels). For now the overlay text is in Jap...

I finally found some time to play through Streets of Rage 4. Naturally, I was curious how it would look on a Mega Drive, so I made a very small slideshow with SGDK using a couple of images I found on Google. Turns out even with 16 colors this does not look so bad. With a more sophisticated tiling an...

You can think of each line as a "window" of height 1. The vertical scroll value applies to such a "window" in the same way as it does to the full plane. So we can vertically scroll what is displayed in each line if we set the vertical scroll value with HInt. It is important that VDP_setVerticalScrol...

Here's a quick example how this can be done with SGDK 1.60. scaling.png In this example HInt and VInt look like this: static u8 lineDisplay = 0; // line position on display screen static fix16 lineGraphics = 0; // line position in graphics texture static fix16 scroll = 0; // scrolling offset static ...

Thanks ob1 and Stef! Yes, the transfer is limited to 6 values (the logo is 96 pixels wide). I had to use some inline assembly and a lot of trial and error to get there. I haven't done any cycle counting, but I don't think it can be much more. One could try to move the HInt code to Sega.s, or maybe u...

I've been experimenting with writing multiple values to VSRAM in the HInt routine each line in order to set vertical scroll values for a number of two-tile columns. In the example shown here, this is used to generate a fake transparent highlight bar by setting the vertical scroll value to select a s...

I just ran into the same problem. SGDK does have a VDP_setTileMapXY() function in SGDK/src/vdp_tile.c. You can modify the code so that it reads from VRAM, something like: u16 VDP_getTileMapXY(VDPPlane plane, u16 x, u16 y) { vu32* const plctrl = (u32*)GFX_CTRL_PORT; vu16* const pwdata = (u16*)GFX_DAT...

Very nice example! Love it! Is there any possibility to make this in horizontal instead vertical? Thanks! It's possible to shift each line horizontally, but that would not warp (or scale) the line, just move it. Thinking more of it, one could pre-compute some warping as tiles, and then repeat them ...

The effect looks gorgeous ! well done ! And the settings menu is really nicely done too. Can i eventually use it as default sample ? that is the kind of sample i always wanted to do but never spent time for that. Of course you will be credited for that :) Also it's good that you made it for SGDK 1....

Yup, I have seen it even on black and white Atari machines like Dominos (1977), but I did not know Quiz Show is considered to be the first one to use it (https://www.arcade-history.com/?n=quiz- ... il&id=3345)

While, I'm at it ... I've seen some demos and games on the Genesis that were using the classic Namco arcade font (e.g., from Pac Man). However, I did not find an SGDK "compatible" version, so I made one using the font files found here: http://www.zone38.net/font. The nice thing is that it also inclu...

Hi, I wanted to get a bit more used to the new SGDK 1.60 release, so I programmed a sample as an exercise. Something I always wanted to try on the Genesis is screen warping. To achieve this, the demo uses a horizontal interrupt handler which modifies the vertical scrolling settings each line. Includ...

Just in case anyone is interested in this... I recently wanted the change the name of the "out" directory for my current project. When trying to introduce a variable "$(OUT)" for this in the makefile, I ran into the problem that the output location is hardcoded in boot/sega.s: .incbin "out/rom_head....

If going up to 32 internal sprites would work with little performance loss, that sounds like a good compromise. That should probably be enough in most situations. In my current project I'm using the sprites for letters in a title screen. Here, 16 is not enough, 32 would work though. In any case, the...