From c7b0b280339064ab1b673ab7767d0318b2e9b72a Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sun, 29 Nov 2020 19:31:22 +0100
Subject: 7-segment display is now drawn

---
 emu/7seg.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

(limited to 'emu/7seg.c')

diff --git a/emu/7seg.c b/emu/7seg.c
index 8a9ea1a..f4bc25e 100644
--- a/emu/7seg.c
+++ b/emu/7seg.c
@@ -1,10 +1,18 @@
 #include "7seg.h"
 
 #include <stdio.h>
+#include <stdbool.h>
+
+#ifdef WITH_GUI
+
+#endif
 
 static device_vtable_t const seg7_vtable = {
 	seg7_read,
 	seg7_write,
+#ifdef WITH_GUI
+	seg7_draw,
+#endif
 	seg7_deinit
 };
 
@@ -59,6 +67,84 @@ void seg7_write( void *obj, uint16_t addr, uint8_t data )
 	}
 }
 
+#ifdef WITH_GUI
+
+enum {
+	NOF_DIGITS = 16,
+	NOF_SEGS = 7,
+	// direction of the segment (vertical or horizontal)
+	H = 0,
+	V = 1,
+	// segment positions in the segs array (bit)
+	A = 6,
+	B = 5,
+	C = 4,
+	D = 3,
+	E = 2,
+	F = 1,
+	G = 0
+};
+
+static int segs[NOF_DIGITS] = {
+	0x7E, 0x30, 0x6D, 0x79, 0x33,
+	0x5B, 0x5F, 0x70, 0x7F, 0x7B,
+	0x77, 0x1F, 0x4E, 0x3D, 0x4F,
+	0x47
+};
+
+static int x_pos[NOF_SEGS] = {
+	5, 45, 45,  5,  5,  5 , 5 
+};
+
+static int y_pos[NOF_SEGS] = 
+{
+	5,  5, 45, 90, 45,  5, 45
+};
+
+static int direction[NOF_SEGS] =
+{
+	H, V, V, H, V, V, H
+};
+
+static void printSegment( SDL_Renderer *renderer, int x, int y, int direction, bool enabled )
+{
+	int r = 80;
+	
+	if( enabled ) {
+		r = 255;
+	}
+			
+	switch( direction ) {
+		case H:
+			boxRGBA( renderer, x-3, y-3, x+40, y+3, r, 0x00, 0x00, 0xFF );	
+			break;
+		
+		case V:
+			boxRGBA( renderer, x-3, y-3, x+3, y+40, r, 0x00, 0x00, 0xFF );	
+			break;
+	}
+}
+
+static void printDigit( SDL_Renderer *renderer, int x, int y, int digit )
+{
+	int v = ( 1 << 6 );
+	for( int i = 0; i < 7; i++ ) {
+		printSegment( renderer, x + x_pos[i], y + y_pos[i], direction[i], v & segs[digit] );
+		v >>= 1;
+	}
+}	
+
+void seg7_draw( void *obj, SDL_Renderer *renderer )
+{
+	seg7_t *seg = (seg7_t *)obj;
+	
+	boxRGBA( renderer, 10, 10, 110, 110, 0x00, 0x00, 0x00, 0xFF );
+	
+	printDigit( renderer, 10, 10, ( seg->latch & 0x00F0 ) >> 4 );
+	printDigit( renderer, 60, 10, seg->latch & 0x000F );
+}
+#endif
+
 void seg7_deinit( void *obj )
 {
 	seg7_t *seg = (seg7_t *)obj;
-- 
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