From 184cba5adffaecc3b7d538d24c910e780b7553d8 Mon Sep 17 00:00:00 2001
From: "(Tim) Efthimis Kritikos" <efkf@firemail.cc>
Date: Sat, 17 Feb 2024 20:43:41 +0000
Subject: [PATCH] Programs: Improved the 3d rendering code but this yielded
 only a marginal increase in fps

---
 programs/3d_renderer.asm | 78 ++++++++++++++++------------------------
 1 file changed, 31 insertions(+), 47 deletions(-)

diff --git a/programs/3d_renderer.asm b/programs/3d_renderer.asm
index 861d537..361ed9d 100644
--- a/programs/3d_renderer.asm
+++ b/programs/3d_renderer.asm
@@ -23,47 +23,40 @@ MOV $>DATA_START,%R0l
 MOV $<DATA_START,%R0h
 MOV $0x001A,%R7l
 MOV $0x0000,%R7h #The number of points (x2 lines)
-MOV $0x0001,%R6l
-MOV $0x0000,%R6h #constant 1
 MOV $0x0004,%R5l
 MOV $0x0000,%R5h #Constant 4
-
+MOV $0x0008,%R2l
+MOV $0x0000,%R2h #Constant 8
+MOV $0x3e4c,%R6h
+MOV $0xcccd,%R6l #The angle to rotate by
 :SPIN_LOOP
-#Read in a point R1:x  R2:y  R3:z
+#Read in a point R1:x   R3:z
 MOV (%R0),%R1
-ADD %R5,%R0
-MOV (%R0),%R2
-ADD %R5,%R0
+ADD %R2,%R0
 MOV (%R0),%R3
-MOV $0x3e4c,%R4h
-MOV $0xcccd,%R4l #The angle to rotate by
+MOV %R6,%R4
 COS %R4
 PUSH %R1
 FMUL %R4, %R1
-MOV $0x3e4c,%R4h
-MOV $0xcccd,%R4l #The angle to rotate by
+MOV %R6,%R4
 SIN %R4
 FMUL %R3,%R4
 FADD %R4,%R1
-SUB %R5,%R0
-SUB %R5,%R0
+SUB %R2,%R0
 MOV %R1,(%R0)
-ADD %R5,%R0
-ADD %R5,%R0
-MOV $0x3e4c,%R4h
-MOV $0xcccd,%R4l #The angle to rotate by
+ADD %R2,%R0
+MOV %R6,%R4
 SIN %R4
 POP %R1
 FMUL %R4,%R1
-MOV $0x3e4c,%R4h
-MOV $0xcccd,%R4l #The angle to rotate by
+MOV %R6,%R4
 COS %R4
 FMUL %R4,%R3
 FSUB %R1,%R3
 MOV %R3,(%R0)
 ADD %R5,%R0
 
-SUB %R6,%R7
+DEC %R7
 JMP,NZ $SPIN_LOOP
 
 
@@ -72,8 +65,6 @@ MOV $>DATA_START,%R0l
 MOV $<DATA_START,%R0h
 MOV $0x000D,%R7l
 MOV $0x0000,%R7h
-MOV $0x0001,%R6l
-MOV $0x0000,%R6h
 MOV $0x0004,%R5l
 MOV $0x0000,%R5h
 MOV $0xFFFC,%R4l
@@ -81,60 +72,53 @@ MOV $0x00FF,%R4h
 MOV $0x0002,%R1l
 MOV $0x0000,%R1h #Clear the frame
 MOV %R1,(%R4)
+MOV $0x3f80,%R6h
+MOV $0x0000,%R6l
+MOV $0xFFFC,%R4l
+MOV $0x00FF,%R4h
+
 :RENDER_LOOP
 MOV $0xFFFF,%R1l
 MOV $0xFFFF,%R1h
 MOV %R1,(%R4)
 #Read in a point R1:x  R2:y  R3:z
-MOV $0x3f4c,%R4h #0.8
-MOV $0xcccd,%R4l
 MOV (%R0),%R1
 ADD %R5,%R0
 MOV (%R0),%R2
 ADD %R5,%R0
 MOV (%R0),%R3
 ADD %R5,%R0
-FSUB %R4,%R1
-FSUB %R4,%R2
+FSUB %R6,%R1
+FSUB %R6,%R2
 
-MOV $0x3f80,%R4h
-MOV $0x0000,%R4l
-FADD %R4,%R3
-FADD %R4,%R3
-FADD %R4,%R1
-FADD %R4,%R2
+FADD %R6,%R3
+FADD %R6,%R3
+FADD %R6,%R1
+FADD %R6,%R2
 FDIV %R3,%R1
 FDIV %R3,%R2
-MOV $0xFFFC,%R4l
-MOV $0x00FF,%R4h
 MOV %R1,(%R4)
 MOV %R2,(%R4)
 
-MOV $0x3f4c,%R4h #0.8
-MOV $0xcccd,%R4l
 MOV (%R0),%R1
 ADD %R5,%R0
 MOV (%R0),%R2
 ADD %R5,%R0
 MOV (%R0),%R3
 ADD %R5,%R0
-FSUB %R4,%R1
-FSUB %R4,%R2
+FSUB %R6,%R1
+FSUB %R6,%R2
 
-MOV $0x3f80,%R4h
-MOV $0x0000,%R4l
-FADD %R4,%R3
-FADD %R4,%R3
-FADD %R4,%R1
-FADD %R4,%R2
+FADD %R6,%R3
+FADD %R6,%R3
+FADD %R6,%R1
+FADD %R6,%R2
 FDIV %R3,%R1
 FDIV %R3,%R2
-MOV $0xFFFC,%R4l
-MOV $0x00FF,%R4h
 MOV %R1,(%R4)
 MOV %R2,(%R4)
 
-SUB %R6,%R7
+DEC %R7
 JMP,NZ $RENDER_LOOP
 MOV $0x0003,%R1l
 MOV $0x0000,%R1h #Display the frame