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corrected pixel byte values

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sejo 2021-09-28 12:38:28 -05:00
parent 0320168d5f
commit 26c10b129c
1 changed files with 14 additions and 14 deletions
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src/uxn_tutorial_day_2.gmo
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@ -347,7 +347,7 @@ sending a byte to .Screen/pixel will perform the drawing in the screen.
the high nibble of that byte will determine the layer in which we'll draw:
* 0: draw a single pixel in the background
* 1: draw a single pixel in the foreground
* 4: draw a single pixel in the foreground
and the low nibble of the byte will determine its color.
@ -368,10 +368,10 @@ the 8 possible combinations of the pixel byte that we have for drawing a pixel a
& * 01: draw pixel with color 1 in the background layer
& * 02: draw pixel with color 2 in the background layer
& * 03: draw pixel with color 3 in the background layer
& * 10: draw pixel with color 0 in the foreground layer
& * 11: draw pixel with color 1 in the foreground layer
& * 12: draw pixel with color 2 in the foreground layer
& * 13: draw pixel with color 3 in the foreground layer
& * 40: draw pixel with color 0 in the foreground layer
& * 41: draw pixel with color 1 in the foreground layer
& * 42: draw pixel with color 2 in the foreground layer
& * 43: draw pixel with color 3 in the foreground layer
## hello pixel
@ -380,7 +380,7 @@ let's try it all together! the following code will draw a pixel with color 1 in
```
#0008 .Screen/x DEO2
#0008 .Screen/y DEO2
#11 .Screen/pixel DEO
#41 .Screen/pixel DEO
```
the complete program would look as follows:
@ -402,7 +402,7 @@ the complete program would look as follows:
( draw a pixel in the screen )
#0008 .Screen/x DEO2
#0008 .Screen/y DEO2
#11 .Screen/pixel DEO
#41 .Screen/pixel DEO
```
woohoo!
@ -421,19 +421,19 @@ for example, we can draw multiple pixels in an horizontal line, setting the y co
( draw 6 pixels in an horizontal line )
#0008 .Screen/x DEO2
#11 .Screen/pixel DEO
#41 .Screen/pixel DEO
#0009 .Screen/x DEO2
#11 .Screen/pixel DEO
#41 .Screen/pixel DEO
#000a .Screen/x DEO2
#11 .Screen/pixel DEO
#41 .Screen/pixel DEO
#000b .Screen/x DEO2
#11 .Screen/pixel DEO
#41 .Screen/pixel DEO
#000c .Screen/x DEO2
#11 .Screen/pixel DEO
#41 .Screen/pixel DEO
#000d .Screen/x DEO2
#11 .Screen/pixel DEO
@ -444,7 +444,7 @@ note that we have to set the color for each pixel we draw; that operation signal
we can define a macro to make it easier to repeat that:
```
%DRAW-PIXEL { #11 .Screen/pixel DEO } ( -- )
%DRAW-PIXEL { #41 .Screen/pixel DEO } ( -- )
```
## reading and manipulating coordinates
@ -515,7 +515,7 @@ using these macros we defined above, our code could end up looking as following:
|20 @Screen [ &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1 ]
( macros )
%DRAW-PIXEL { #11 .Screen/pixel DEO } ( -- )
%DRAW-PIXEL { #41 .Screen/pixel DEO } ( -- )
%INC-X { .Screen/x DEI2 INC2 .Screen/x DEO2 } ( -- )
( main program )