Thank you for the feedback. I'm glad you all enjoyed my game. The next two features I'm going to add to the game are sound effects and dynamic sprite tiles. If I don't add sound effects now, it will be months before I get around to it. Afterwards I will add more player MetaSprite frames (player hurt...

It's taken a lot longer then I expected, but I have finally released a tech-demo for my unnamed-snes-game. It's a simple demo, a single dungeon. Sadly, there is no sound. I wanted to release this demo by year's end and I ran out of time. 20230101a-screenshot-ac-scaled.jpeg Download Link: https://git...

Is reading VRAM also autoincrement? VMDATAREAD does autoincrement (depending on the state of VMAIN ), however the autoincrement (and VRAM-chip read by the PPU) occurs after VMDATAREAD outputs the vram_latch value. In practice this requires you to preform a dummy read if you are preforming multiple ...

Here is my test ROM. This test will use an IRQ interrupt to wait until after DRAM-refresh, write to WRMPYA and WRMPYB with a 16 bit A, wait a few CPU cycles, write to WRMPYB, wait 8 cycles, read RDMPYL and RDMPYB. INPUTS: A = value to write to WRMPYA B1 = value of the first write to WRMPYB B2 = valu...

Thankyou for offering to help. I've written text-buffers before, I just don't have one written for my snes-test-roms environment. With the amount of free time I have, it should easily take a day or two to code/bugfix and a day to document/proofread. While I'm coding a text-buffer, I may as well writ...

I can write a test ROM.

It will take me a week to code it. I'll need to code a text-buffer to display the results.

I have coded a precalculated non-symmetrical single-window demo. This one is a little simpler then the previous demo. There are only two code paths; one for negative x-offset (moving left) and another for positive x-offset (moving right). Splitting the code in two allowed me to preform all horizonta...

For horizontal movement with clipping, it uses indirect HDMA where the indirect table is a 256 byte buffer that contains a mapping from table to screen coordinate. This mapping can be generated with DMA memcpy and memset, basically. That is ingenious. I would never have thought of using indirect HD...

I have coded a precalculated horizontally-symmetrical single-window demo. This demo draws a double-buffered HDMA table from a list of half-width bytes with offscreen testing and clamping. To correctly preform the 8-bit clamping and offscreen tests, the DrawSymmetricalWindow subroutine is split into ...

Very informative and useful. Thank-you for taking the time to write this guide.

I forgot to include a window-is-offscreen test to the demo. This can result in a 1-pixel line on the left or right side of the screen. The test is a simple one; if the calculated left > 255 or calculated right < 0, then the window is considered offscreen. I have decided against including an optimise...

~40-65% CPU to draw a large triangle How? Isn't unrolled Bresenham reasonably fast? I never got around to fully optimising the code. There's no loop unrolling and there may be some potential optimisations I missed. I based the code off Bresenham's line drawing algorithm and it can be found here . M...

Cool. I'd like to see the five-pointed star and ellipse. A non-rotated ellipse is easy, for a pre-calculated HDMA table. Multiply the left-right offset of the circle by an x-scale. If you look at my source code you'll see the formula I used for a circle, which includes an x_scale variable (which I ...

Wonderful demo dougeff.

I especially like how easily it shows off the layer priorities and draw-order (compared to the priority lists in the wiki).

I have written some hard-coded HDMA tables that use a single window to draw some shapes onto the backdrop. I'm going to use them for a Single Window Examples page on the SNES wiki (as requested on Discord). The demo shows off a hard-coded: Rectangle Trapezium Triangle pointing right Octagon Diamond ...