fixed nametab.B invalid address, and spr_submit with 0 sprites

[mdlife] / src / sprite.S

diff --git a/src/sprite.S b/src/sprite.S
index 158aaac..d258d62 100644 (file)
--- a/src/sprite.S
+++ b/src/sprite.S
@@ -8,11 +8,16 @@
 
        .globl spr_submit
 spr_submit:
-       move.l spr_count, %d0
-       lsl.l #2, %d0                   | 4 words per sprite
+       move.w spr_count, %d0
+       tst.w %d0
+       bne.s 0f
+       | if spr_count is zero, upload a single null sprite
+       addq.w #1, %d0
+0:     ext.l %d0
+       lsl.w #2, %d0                   | 4 words per sprite
        move.l %d0, -(%sp)
        pea spr_shadow
-       pea 0xe000.w                    | we placed the spirte table at e000
+       pea 0xd000.w                    | we placed the spirte table at d000
        jsr dma_systovram
        addq.l #8, %sp
        addq.l #4, %sp