From fba8c1f2f41c7b3aba2b8b9f1f5c2d829518d3a5 Mon Sep 17 00:00:00 2001
From: "(Tim) Efthimis Kritikos" <efkf@firemail.cc>
Date: Fri, 16 Feb 2024 19:12:03 +0000
Subject: [PATCH] GUI: Added support for double buffering on the vector display
 for smoother motion

---
 gui.c                    | 17 +++++++++++------
 programs/3d_renderer.asm | 27 ++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 7 deletions(-)

diff --git a/gui.c b/gui.c
index 9aaeb3d..3dd8d9d 100644
--- a/gui.c
+++ b/gui.c
@@ -598,8 +598,10 @@ int update_general_terminal_output(struct simdata_t *simdata){
 
 	term_curs_x=0;
 	term_curs_y=0;
-	uint8_t* vector_frame_buffer=malloc((height*4)*(width*2));
-	memset(vector_frame_buffer,0,(height*4)*(width*2));
+	uint8_t* vector_working_frame_buffer=malloc((height*4)*(width*2));
+	uint8_t* vector_display_frame_buffer=malloc((height*4)*(width*2));
+	memset(vector_working_frame_buffer,0,(height*4)*(width*2));
+	memset(vector_display_frame_buffer,0,(height*4)*(width*2));
 
 	int vector=0;
 	int vstate=0;
@@ -615,7 +617,9 @@ int update_general_terminal_output(struct simdata_t *simdata){
 					if(c==0x00000001)
 						vector=0;
 					else if(c==0x00000002)
-						memset(vector_frame_buffer,0,(height*4)*(width*2));
+						memset(vector_working_frame_buffer,0,(height*4)*(width*2));
+					else if(c==0x00000003)
+						memcpy(vector_display_frame_buffer,vector_working_frame_buffer,(height*4)*(width*2));
 					else
 						vstate++;
 					break;
@@ -641,7 +645,7 @@ int update_general_terminal_output(struct simdata_t *simdata){
 						xoff=(vfb_width-vfb_height)/2;
 					else
 						yoff=(vfb_height-vfb_width)/2;
-					braille_frame_buffer_line(vector_frame_buffer,vfb_width,vfb_height,xoff+(x0+1)*(min_dim/2),yoff+(y0+1)*(min_dim/2),xoff+(x1+1)*(min_dim/2),yoff+(y1+1)*(min_dim/2));
+					braille_frame_buffer_line(vector_working_frame_buffer,vfb_width,vfb_height,xoff+(x0+1)*(min_dim/2),yoff+(y0+1)*(min_dim/2),xoff+(x1+1)*(min_dim/2),yoff+(y1+1)*(min_dim/2));
 					vstate=0;
 					break;
 			}
@@ -690,10 +694,11 @@ int update_general_terminal_output(struct simdata_t *simdata){
 		mvwchgat(general_terminal_output,term_curs_y+1,term_curs_x+1,   1, A_REVERSE, 0, NULL);
 		mvwprintw(general_terminal_output,0,width/2-7,"[ TERM OUTPUT ]");
 	}else{
-		print_braille_frame_buffer(general_terminal_output,vector_frame_buffer,(width-2)*2,(height-2)*4);
+		print_braille_frame_buffer(general_terminal_output,vector_display_frame_buffer,(width-2)*2,(height-2)*4);
 		mvwprintw(general_terminal_output,0,width/2-9,"[ VECTOR DISPLAY ]");
 	}
-	free(vector_frame_buffer);
+	free(vector_working_frame_buffer);
+	free(vector_display_frame_buffer);
 
 	return 0;
 }
diff --git a/programs/3d_renderer.asm b/programs/3d_renderer.asm
index 6854424..a48ee38 100644
--- a/programs/3d_renderer.asm
+++ b/programs/3d_renderer.asm
@@ -6,6 +6,23 @@ MOV $0xFFFF,%R1l
 MOV $0xFFFF,%R1h
 MOV %R1,(%R4)
 CALL $RENDER
+MOV $>DATA_START,%R0l
+MOV $<DATA_START,%R0h
+MOV (%R0),%R1
+MOV $0x3f4c,%R4h #0.8
+MOV $0xcccd,%R4l
+FADD %R4,%R1
+MOV %R1,(%R0)
+CALL $RENDER
+MOV $>DATA_START,%R0l
+MOV $<DATA_START,%R0h
+MOV (%R0),%R1
+MOV $0x3f4c,%R4h #0.8
+MOV $0xcccd,%R4l
+FADD %R4,%R1
+MOV %R1,(%R0)
+CALL $RENDER
+HALT
 
 :RENDER
 MOV $>DATA_START,%R0l
@@ -16,6 +33,11 @@ MOV $0x0001,%R6l
 MOV $0x0000,%R6h
 MOV $0x0004,%R5l
 MOV $0x0000,%R5h
+MOV $0xFFFC,%R4l
+MOV $0x00FF,%R4h
+MOV $0x0002,%R1l
+MOV $0x0000,%R1h #Clear the frame
+MOV %R1,(%R4)
 :RENDER_LOOP
 MOV $0xFFFF,%R1l
 MOV $0xFFFF,%R1h
@@ -71,7 +93,10 @@ MOV %R2,(%R4)
 
 SUB %R6,%R7
 JMP,NZ $RENDER_LOOP
-HALT
+MOV $0x0003,%R1l
+MOV $0x0000,%R1h #Display the frame
+MOV %R1,(%R4)
+RET