From: kub <derkub@gmail.com>
Date: Tue, 18 Jun 2024 20:45:02 +0000 (+0200)
Subject: core vdp, arm rendering fix (1st window col prio)
X-Git-Tag: v2.00~31
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbb9a09837d9ff8930757ef6d4b102eeafb212ef;p=picodrive.git

core vdp, arm rendering fix (1st window col prio)
---

diff --git a/pico/draw.c b/pico/draw.c
index 1b4ceb3c..7c170baf 100644
--- a/pico/draw.c
+++ b/pico/draw.c
@@ -566,7 +566,7 @@ static void DrawLayer(int plane_sh, u32 *hcache, int cellskip, int maxcells,
     ts.nametab+=(ts.line>>4)<<shift[width];
 
     DrawStripInterlace(&ts, plane_sh);
-  } else if( pvid->reg[11]&4) {
+  } else if (pvid->reg[11]&4) {
     // shit, we have 2-cell column based vscroll
     // luckily this doesn't happen too often
     ts.line=ymask|(shift[width]<<24); // save some stuff instead of line
diff --git a/pico/draw_arm.S b/pico/draw_arm.S
index c01439aa..37617b91 100644
--- a/pico/draw_arm.S
+++ b/pico/draw_arm.S
@@ -461,7 +461,6 @@ DrawLayer:
     subs    r10,r10, #0x01000000
     bmi     .dsloop_exit
 
-.dsloop_enter:
     and     r7, r5, r8
     add     r7, lr, r7, lsl #1 @ Pico.vram+((tilex&ts->xmask) as halfwords)
     ldrh    r7, [r7, r12]      @ r7=code (int, but from unsigned, no sign extend)
@@ -1385,6 +1384,9 @@ DrawWindow:
     and     r10, r10, #7
     mov     r10, r10, lsl #1      @ r10=ty
 
+    ldr     r6, [r11, #OFS_EST_rendstatus]
+    ldr     lr, [r11, #OFS_EST_PicoMem_vram]
+
     mov     r12, r12, lsl #10
 
     tst     r4, #1                @ 40 cell mode?
@@ -1394,12 +1396,6 @@ DrawWindow:
     addeq   r12, r12, r5, lsl #6  @ nametab
     add     r12, r12, r0, lsl #2  @ +starttile
 
-    ldr     lr, [r11, #OFS_EST_PicoMem_vram]
-    ldr     r6, [r11, #OFS_EST_rendstatus]
-
-    @ fetch the first code now
-    ldrh    r7, [lr, r12]
-
     ands    r6, r6, #PDRAW_WND_DIFF_PRIO
     cmpeq   r2, #1                @ prio && !(rendstatus & WND_DIFF_PRIO)?
     ldmeqfd sp!, {r4-r11,pc}      @ yes, assume that whole window uses same priority
@@ -1412,20 +1408,18 @@ DrawWindow:
     @ cache some stuff to avoid mem access
     ldr     r11, [r11, #OFS_EST_HighCol]
     mov     r8, r8, lsl #1        @ cells
-    add     r11,r11,#8
     mvn     r9, #0                @ r9=prevcode=-1
-    add     r1, r11, r0, lsl #4   @ r1=pdest
+    add     r1, r11, r0, lsl #4   @ r1=pdest=HighCol+starttile (+8 added in loop)
     mov     r0, #0xf
-    b       .dwloop_enter
 
     @ r4,r5 are scratch in this loop
 .dwloop:
     add     r1, r1, #8
 .dwloop_nor1:
-    add     r12, r12, #2    @ halfwords
     ldrh    r7, [lr, r12]   @ r7=code (int, but from unsigned, no sign extend)
+    add     r12, r12, #2    @ halfwords
     subs    r8, r8, #1
-    beq     .dwloop_end     @ done
+    bmi     .dwloop_end     @ done
 
     eor     r5, r6, r7, lsr #15
     tst     r5, #1
@@ -1435,7 +1429,6 @@ DrawWindow:
     cmp     r7, r9
     beq     .dw_samecode    @ we know stuff about this tile already
 
-.dwloop_enter:
     mov     r9, r7          @ remember code
 
     movs    r2, r9, lsl #20 @ if (code&0x1000)