10 replies to this topic

[SoftCalc]

TRUONG The Vinh has created the game Aspirin for the ClassPad which uses grayscale! There is a lot of flicker so it isn't optimized, but I'd be interested in knowing how this was accomplished.

The game runs very fast so TRUONG must be using some tricks.

[Lovecasio]

Hi.
I am saying for sure that the person who developed this game is Vietnamese ( or at least, have something relates to Vietnam ) because his name, TRUONG THE VINH, is completely Vietnamese name. In Vietnamese it should be: TRƯƠNG Thế Vinh.
OK, I want to ask a "very stupid" question: What is GRAYSCALE ? I have read this many times, but I still have no knowledge about. I am glad to see someone out there can help me to explain it ?
Thanks.

[CrimsonCasio]

greyscale is using any more than just black and white coloring for display (you use shades of grey)... look here:

[Kilburn]

TRUONG The Vinh has created the game Asprin for the ClassPad which uses grayscale!

<{POST_SNAPBACK}>

A.S.P.I.R.I.N !!! You forgot the I !!!

I used the source code of the addin test1 on www.classpad.org.

To have grayscales I added that :

char col;
while(1)
{
    if(++col > 1) col = 0;
    BeginDraw();
    DrawFrame();
    if(col) //what you want to draw in grayscales
    EndDraw();
}

But do you think it may be faster if I use PegScreen instead of PegThing?

[SoftCalc]

I don't think it matters because most of the PegThing draw functions are just in-line functions in the header that draw directly to the PegScreen. I think the most important thing is how the drawing is being done.

One thing that would be quicker is to access the video buffer in the BIOS directly, but this is not supported. "Not supported" isn't necessarily a bad thing, it just means if the hardware or low level BIOS were to change your code might not run.

[Dream of Omnimaga]

Hmm interesting. I was always wondering why gs wasntt possible on the cp300, is it because its too slow or because the LCD refresh state is too fast?

[SoftCalc]

Hmm interesting. I was always wondering why gs wasntt possible on the cp300, is it because its too slow or because the LCD refresh state is too fast?

<{POST_SNAPBACK}>

The ClassPad has a fast CPU. The only reason is doesn't have grayscale isn't for technical reasons. It just hasn't been done yet.

[Dream of Omnimaga]

I dunno if this might help but I felt like posting this anyway. Here is how I made my grayscale in TI-BASIC, 3 level of gray. The procedure might differ since I did that not only on a TI-83+, but in BASIC, not ASM/C. First You need two layers of course and my technique used the XOR logic ( if classpad wont use XOR logic and such stuff ignore my post)

draw a sprite. Save your picture 1. Lets assume the sprite look like the one right to the top-most cavern wall like this:
http://www.ticalc.or...te_making_1.gif

Now fill all the white areas in the sprite with black pixels (the sprite here act as a guide) and erase the black areas, save this as another pic. It should look like this:
http://www.ticalc.or...te_making_2.gif
now you need to display the first pic ina program, then switch back and forth very quickly all grey areas in the sprites by displaying the second pic using the XOR logic (actually in my technique the second pic acted as a sort of mask creatig the grayscale). Now comes the problems. I dunno how fast it would run but if it flicker badly I would suggest now going bakc to the picture no 1, and fill the gray areas with a checkered like this:
http://www.ticalc.or...te_making_3.gif

this should create a optical illusion making your eyes think it doesnt flicker, so you dont get a seizure while playing the game

at the end it should give this:
http://www.ticalc.or...te_making_4.gif



I dunno if anybody will understand though, actually this info came from my BASIC Grayscale tutorial for the 83+SE and since I dont have a casio I cannot explain really well
http://www.ticalc.or.../358/35823.html

[Kilburn]

Impossible The author of the grayscales library (Gaumerie) didn't release it yet.