initial commit

2026-07-18 20:34:55 +02:00
commit 59ad004c96
474 changed files with 226635 additions and 0 deletions
@@ -0,0 +1,128 @@
+#include <c64/vic.h>
+#include <c64/memmap.h>
+#include <string.h>
+
+byte font[2048];
+
+// Copy the system font into local RAM for easy access
+void copyFont(void)
+{
+	mmap_set(MMAP_CHAR_ROM);
+
+	memcpy(font, (byte *)0xd800, 2048);
+
+	mmap_set(MMAP_ROM);
+}
+
+// Single row of screen has 40 characters
+typedef char	ScreenRow[40];
+
+// Screen and color space
+ScreenRow * const screen = (ScreenRow *)0x0400;
+ScreenRow * const color = (ScreenRow *)0xd800;
+
+// Start row for text
+#define srow 5
+
+// Move the screen one character to the left
+void scrollLeft(void)
+{
+	// Loop horizontally
+	for(char x=0; x<39; x++)
+	{
+		// Unroll vertical loop 16 times
+		#pragma unroll(full)
+		for(char y=0; y<16; y++)
+		{
+			screen[srow + y][x] = screen[srow + y][x + 1];
+		}
+	}
+}
+
+// Expand one column of a glyph to the right most screen column
+void expand(char c, byte f)
+{
+	// Address of glyph data
+	byte * fp = font + 8 * c;
+
+	// Unroll eight times for each byte in glyph data
+	//#pragma unroll(full)
+	for(char y=0; y<8; y++)
+	{
+		char t = (fp[y] & f) ? 160 : 32;
+		screen[srow + 2 * y + 0][39] = t;
+		screen[srow + 2 * y + 1][39] = t;
+	}
+}
+
+const char * text = 
+	s"Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt "
+	s"ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo "
+	s"dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit "
+	s"amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor "
+	s"invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam "
+	s"et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.";
+
+
+int main(void)
+{
+	// Install the IRQ trampoline
+	mmap_trampoline();
+
+	// Copy the font data
+	copyFont();
+
+	// Cleat the screen
+	memset(screen, 0x20, 1000);
+
+	// Color bars
+	for(int i=0; i<16; i++)
+		memset(color[srow + i], i + 1, 40);
+
+	vic.color_back = VCOL_BLACK;
+	vic.color_border = VCOL_BLACK;
+
+	// Hide left and right column
+	vic.ctrl2 = 0;
+
+	// Loop over text
+	int	ci = 0;
+	for(;;)
+	{
+		// Loop over glyph from left to right
+		byte cf = 0x80;
+		while (cf)
+		{
+			for(char i=0; i<2; i++)
+			{
+				// Pixel level scrolling
+				vic_waitBottom();
+				vic.ctrl2 = 4;
+				vic_waitTop();
+
+				vic_waitBottom();
+				vic.ctrl2 = 2;
+				vic_waitTop();
+
+				vic_waitBottom();
+				vic.ctrl2 = 0;
+				vic_waitTop();
+
+				vic_waitBottom();
+				vic.ctrl2 = 6;
+
+				// Crossing character border, now scroll and show new column
+				scrollLeft();
+				expand(text[ci], cf);
+			}
+
+			// Next glyph column
+			cf >>= 1;
+		}
+
+		// Next character
+		ci++;
+	}
+
+	return 0;
+}