dunkirk.sh / flea
bouncy fpga game www.youtube.com/watch?v=IiLWF3GbV7w
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bug: vector overflow on width

dunkirk.sh 6a4219d3 f17b4db2

verified
+10 -9
+5 -4
physics_engine.vhd
··· 192 192 end if; 193 193 194 194 -- == LEFT WALL == 195 - if px(9) = '1' or px <= LEFT_WALL then 196 - px := LEFT_WALL; 195 + -- Detect underflow: moving left (vx negative) but px wrapped to > pos_x 196 + if (vx(9) = '1' and px > pos_x) or px <= LEFT_WALL + SIZE then 197 + px := LEFT_WALL + SIZE; 197 198 bounced := '1'; bounce_wall := '1'; 198 199 bounce_speed := (not vx) + 1; 199 200 vx := (not vx) + 1; ··· 203 204 end if; 204 205 205 206 -- == RIGHT WALL == 206 - if px >= RIGHT_WALL then 207 - px := RIGHT_WALL; 207 + if px >= RIGHT_WALL - SIZE then 208 + px := RIGHT_WALL - SIZE; 208 209 bounced := '1'; bounce_wall := '1'; 209 210 bounce_speed := vx; 210 211 vx := (not vx) + 1;
+5 -5
visualizer.py
··· 32 32 GROUND = 440 33 33 CEILING = 16 34 34 LEFT_WALL = 8 35 - RIGHT_WALL = 620 35 + RIGHT_WALL = 631 36 36 GROUND_TOP = 448 37 37 CEIL_BOT = 8 38 38 ··· 215 215 vy = to_unsigned(svy) 216 216 217 217 # --- Left wall bounce --- 218 - if px <= LEFT_WALL: 219 - px = LEFT_WALL 218 + if px <= LEFT_WALL + SIZE: 219 + px = LEFT_WALL + SIZE 220 220 bounced = True; bounce_wall = True 221 221 bounce_speed = abs(to_signed(vx)) 222 222 vx = negate(vx) ··· 226 226 vx = to_unsigned(svx) 227 227 228 228 # --- Right wall bounce --- 229 - if px >= RIGHT_WALL: 230 - px = RIGHT_WALL 229 + if px >= RIGHT_WALL - SIZE: 230 + px = RIGHT_WALL - SIZE 231 231 bounced = True; bounce_wall = True 232 232 bounce_speed = abs(to_signed(vx)) 233 233 vx = negate(vx)