Difference between revisions of "ARM: Sierpinski triangle"
From ScienceZero
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BNE LOOP | BNE LOOP | ||
| + | [[File:Sierpinskicodercolour.png]] | ||
[[Category:Computing]] | [[Category:Computing]] | ||
Revision as of 16:10, 11 July 2014
Draws the sierpinski triangle on a 320x256 screen with 8 bits per pixel.
MOV R9,#320 ; Screen width
MOV R2,#5 ; Random number generator seed
MOV R4,#160 ; X position of top vertex
MOV R8,#1048576 ; Loop counter
MOV R11,#160 ; Set start position to middle of the screen
MOV R12,#128
.LOOP RSB R2,R2,R2,ROR #21 ; Generate random number in the range 0 to 2
MOVS R3,R2,LSR #31 ; LSB in carry, MSB in R3
BHI LOOP ; Repeat if 3
ADDCC R11,R11,R4,LSL R3 ; Calculate position which is halfway
ADDCC R12,R12,R3,LSL #8 ; between the old and the new vertex
ADDCS R12,R12,#256
MOV R11,R11,LSR #1
MOV R12,R12,LSR #1
MLA R7,R12,R9,R11 ; R7 = (R12 * 320) + R11
STRB R12,[R0,R7]
SUBS R8,R8,#1
BNE LOOP
