From 0ecf3e1c8b566534e0dba42d52b2194287e0af72 Mon Sep 17 00:00:00 2001
From: Scott Duensing <scott@kangaroopunch.com>
Date: Fri, 4 Oct 2019 19:43:53 -0500
Subject: [PATCH] Test code now exercising ASM line drawing.

---
 joeylib/src/jIIgs.asm |  2 -
 joeylib/src/test.c    | 87 ++++++++++++++++++++++++++++++++++++-------
 2 files changed, 74 insertions(+), 15 deletions(-)

diff --git a/joeylib/src/jIIgs.asm b/joeylib/src/jIIgs.asm
index 58d49d9..d296d1f 100644
--- a/joeylib/src/jIIgs.asm
+++ b/joeylib/src/jIIgs.asm
@@ -368,7 +368,6 @@ odd_c	equ	19
 
 ;			Say surface = $012000...
 
-;	lda	#<surface	; Should be $2000
 	lda	surface	; Should be $2000
 	sta	__e0	; set "even" addresses
 	sta	__e1
@@ -402,7 +401,6 @@ odd_c	equ	19
 	sta	__o13
 
 	phb		; keep original bank
-;	lda	#>surface	; Should be $0120
 	lda	surface+1	; Should be $0120
 	pha		; switch to bank we're pointing into
 	plb		; B is now $20 - bad!
diff --git a/joeylib/src/test.c b/joeylib/src/test.c
index 80a4696..c69a49d 100644
--- a/joeylib/src/test.c
+++ b/joeylib/src/test.c
@@ -32,6 +32,10 @@ segment "testapp";
 #endif
 
 
+extern jint16 asmTest(jlSurfaceT source);
+extern void asmDrawLine(jlSurfaceT target, jint16 color, jint16 x1, jint16 y1, jint16 x2, jint16 y2);
+
+
 // Font hacking!
 __attribute__((__format__ (__printf__, 4, 0)))
 void printAt(jlStaT *font, jint16 cx, jint16 cy, const char *what, ...) {
@@ -58,10 +62,15 @@ int main(void) {
 	jlStaT *kanga = NULL;
 	jlStaT *font  = NULL;
 	jint16 y;
+	jint16 phase      = 0;
+	jint16 x2         = 0;
 	jint16 y2         = 0;
-	jint16 dy         = 1;
+	jint16 ox         = 0;
+	jint16 oy         = 0;
+	jint16 op         = 0;
 	jint16 color      = 15;
 	jint16 nextColor  = 1;
+	char   what[32];
 
 	jlUtilStartup("JoeyLib Test");
 
@@ -72,26 +81,78 @@ int main(void) {
 	jlDrawColorSet(1);
 	jlDrawBox(0, 0, 319, 199);
 
-	jlSoundMusicPlay("music");
+	//jlSoundMusicPlay("music");
 
 	jlPaletteSet(15, 15, 15, 15);
-	printAt(font, 1, 16, "X");
+	strcpy(what, "Left to Right");
+
 	while (!jlKeyPressed()) {
 		y = 17;
-		printAt(font, 1, y++, "X = %d   ", jlGameGetAxis(0));
-		printAt(font, 1, y++, "Y = %d   ", jlGameGetAxis(1));
-		printAt(font, 1, y++, "T = %d   ", jlUtilTimer());
-		printAt(font, 1, y++, "R = %d   ", asmTest((jlSurfaceT)0x012000));
+		//printAt(font, 1, y++, "R = %d   ", asmTest((jlSurfaceT)0x012000));
+		printAt(font, 1, y++, "Drawing %s    ", what);
+
 		jlDrawColorSet((byte)color);
-		jlDrawLine(0, y2, 319, 199-y2);
-		//asmDrawLine(_jlDrawTargetActual, _jlDrawColor, 0, y2, 319, 199-y2);
-		y2 += dy;
-		if (y2 == 199 || y2 == 0) dy = -dy;
+		if (phase < 2) {
+			asmDrawLine(_jlDrawTargetActual, _jlDrawColor, x2, y2, 319-x2, 199-y2);
+		} else {
+			asmDrawLine(_jlDrawTargetActual, _jlDrawColor, 319-x2, 199-y2, x2, y2);
+		}
+		ox = x2;
+		oy = y2;
+		op = phase;
+
+		switch (phase) {
+			// Left, Y incrementing
+			case 0:
+				y2++;
+				if (y2 == 199) {
+					strcpy(what, "Bottom to Top");
+					phase = 1;
+				}
+				break;
+
+			// Bottom, X incrementing
+			case 1:
+				x2++;
+				if (x2 == 319) {
+					strcpy(what, "Right to Left");
+					phase = 2;
+				}
+				break;
+
+			// Right, Y decrementing
+			case 2:
+				y2--;
+				if (y2 == 0) {
+					strcpy(what, "Top to Bottom");
+					phase = 3;
+				}
+				break;
+
+			// Top, X decrementing
+			case 3:
+				x2--;
+				if (x2 == 0) {
+					strcpy(what, "Left to Right");
+					phase = 0;
+				}
+				break;
+		}
+
 		jlDisplayPresent();
-		//jlUtilNibbleSwap((byte *)font->pixels, 32000, (byte)(color), (byte)(nextColor));
+
+		jlDrawColorSet((byte)0);
+		if (op < 2) {
+			asmDrawLine(_jlDrawTargetActual, _jlDrawColor, ox, oy, 319-ox, 199-oy);
+		} else {
+			asmDrawLine(_jlDrawTargetActual, _jlDrawColor, 319-ox, 199-oy, ox, oy);
+		}
+
 		color = nextColor;
 		nextColor++;
-		if (nextColor > 15) nextColor = 1;
+		if (nextColor > 15) {
+			nextColor = 1;
+		}
 	}
 	jlKeyRead();