commit d81d344122b068f6dc686492294851a7ee777869
parent 75a516b7817eab89f3b345db5c0e7295dba09e0b
Author: Léo Villeveygoux <leo.villeveygoux@etu.u-bordeaux.fr>
Date: Fri, 23 Jun 2017 20:24:22 +0200
Add draw.asm
Very basic 8 colors drawing .bin
Diffstat:
| A | draw.asm | | | 78 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 78 insertions(+), 0 deletions(-)
diff --git a/draw.asm b/draw.asm
@@ -0,0 +1,78 @@
+org 0x20000
+bits 32
+
+pix: equ 0x40000
+screen_size: equ 0x10000
+input: equ 0x50000
+
+header: db '#!/usr/bin/env b8', 0x0a
+times 32-$+header db 0x0
+
+jmp [state_fun]
+state_fun dd f
+
+f:
+ ; update coords
+ mov eax, 0
+ mov al, byte [input]
+ mov edx, [coords]
+
+ .check_left:
+ mov cl, 1b
+ and cl, al
+ jz .check_right
+ sub dx, 1
+
+ .check_right:
+ mov cl, 10b
+ and cl, al
+ jz .check_up
+ add dx, 1
+
+ .check_up:
+ mov cl, 100b
+ and cl, al
+ jz .check_down
+ sub dx, 0x100
+
+ .check_down:
+ mov cl, 1000b
+ and cl, al
+ jz .check_x
+ add dx, 0x100
+
+ .check_x:
+ mov cl, 10000b
+ and cl, al
+ jz .check_no_x
+ mov byte [pressing_x], byte 1
+ jmp .check_end
+
+ .check_no_x:
+ mov cl, [pressing_x]
+ mov byte [pressing_x], byte 0
+ test cl, cl
+
+ jz .check_end
+ mov cl, [selected]
+ inc cl
+ and cl, [palette_mask]
+ mov byte [selected], cl
+
+ .check_end:
+ mov [coords], edx
+
+ ; get color
+ mov ecx, 0
+ mov cl, byte [selected]
+ mov al, byte [palette + ecx]
+ mov edx, [coords]
+ mov byte [pix+edx], al
+ ret
+
+
+coords: dd 0x8080
+pressing_x: db 0
+selected: db 0
+palette: db 0, 11b, 11111b, 11100b, 11111100b, 11100000b, 11100011b, ~0
+palette_mask: db 7
