Refactor paths

examples/vga_lines/src/main.cpp

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+
+// ****************************************************************************
+//
+//                                 Main code
+//
+// ****************************************************************************
+
+#include "include.h"
+
+#define LINENUM	70	// number of lines
+#define SPEEDMIN 3.0f	// minimal speed
+#define SPEEDMAX 12.0f	// maximal speed
+#define LENMIN	40	// minimal length of color
+#define LENMAX	200	// maximal length of color
+#define LEVMIN	(3*80)	// minimal bright level
+
+// Draw box
+ALIGNED u8 Box[WIDTH*HEIGHT];
+
+// coordinates
+enum {
+	C_X1 = 0,
+	C_Y1,
+	C_X2,
+	C_Y2,
+
+	C_NUM		// number of coordinates
+};
+
+// current coordinate of head
+float Coord[C_NUM];	// coordinate
+u16 CoordMax[C_NUM];	// max. coordinate
+float Delta[C_NUM];	// delta
+u8 R, G, B;
+
+// length of color segment
+int ColLen;
+
+// lines
+typedef struct {
+	u8	r, g, b;	// line color
+	int	coord[C_NUM];	// line coordinates
+} sLine;
+
+sLine	Lines[LINENUM];	// list of lines
+int Head;		// head index
+
+/*
+// initialize videomode
+void VideoInit()
+{
+	// setup videomode
+	VgaCfgDef(&Cfg); // get default configuration
+	Cfg.video = &DRV; // video timings
+	Cfg.width = WIDTH; // screen width
+	Cfg.height = HEIGHT; // screen height
+	VgaCfg(&Cfg, &Vmode); // calculate videomode setup
+
+	// initialize base layer 0
+	ScreenClear(pScreen);
+	sStrip* t = ScreenAddStrip(pScreen, HEIGHT);
+
+	// draw box
+	sSegm* g = ScreenAddSegm(t, WIDTH);
+	ScreenSegmGraph8(g, Box, WIDTHBYTE);
+
+	// canvas of draw box
+	Canvas.img = Box;
+	Canvas.w = WIDTH;
+	Canvas.h = HEIGHT;
+	Canvas.wb = WIDTHBYTE;
+	Canvas.format = FORMAT;
+
+	// initialize system clock
+	set_sys_clock_pll(Vmode.vco*1000, Vmode.pd1, Vmode.pd2);
+
+	// initialize videomode
+	VgaInitReq(&Vmode);
+}
+*/
+int main()
+{
+	int i, j, k, rr, gg, bb;
+	sLine* line;
+
+	// initialize random number generator
+	RandInitSeed();
+
+	// initialize videomode
+	Video(DEV_VGA, RES_EGA, FORM_8BIT, Box);
+
+	// run VGA core
+//	multicore_launch_core1(VgaCore);
+
+	// initialize videomode
+//	VideoInit();
+
+	// initialize line head to random position and color
+	CoordMax[C_X1] = WIDTH-1;
+	CoordMax[C_Y1] = HEIGHT-1;
+	CoordMax[C_X2] = WIDTH-1;
+	CoordMax[C_Y2] = HEIGHT-1;
+
+	for (i = 0; i < C_NUM; i++)
+	{
+		Coord[i] = RandU16Max(CoordMax[i]);
+		Delta[i] = RandFloatMinMax(SPEEDMIN, SPEEDMAX);
+		if ((RandU8() & 1) != 0) Delta[i] = -Delta[i];
+	}
+
+	do {
+		R = RandU8();
+		G = RandU8();
+		B = RandU8();
+	} while (R+G+B < LEVMIN);
+	Head = 0;
+
+	ColLen = RandU8MinMax(LENMIN,LENMAX);
+	memset(Lines, 0, sizeof(Lines));
+
+	// main loop
+	while (true)
+	{
+		// wait for VSync scanline (to avoid flickering of black lines)
+		WaitVSync();
+		if (Vmode.vfreq > 45) WaitVSync();
+
+		// draw lines
+		j = Head;
+		for (i = 0; i < LINENUM; i++)
+		{
+			// pointer to the line
+			line = &Lines[j];
+
+			// calculate color components
+			rr = (int)((float)line->r * i / (LINENUM-1) + 0.5f);
+			if (rr > 255) rr = 255;
+
+			gg = (int)((float)line->g * i / (LINENUM-1) + 0.5f);
+			if (gg > 255) gg = 255;
+
+			bb = (int)((float)line->b * i / (LINENUM-1) + 0.5f);
+			if (bb > 255) bb = 255;
+
+			// draw line
+			DrawLine(&Canvas, line->coord[C_X1], line->coord[C_Y1], line->coord[C_X2], line->coord[C_Y2], COLRGB(rr,gg,bb));
+
+			// shift line index
+			j++;
+			if (j >= LINENUM) j = 0;
+		}
+
+		// generate new head line
+		j = Head;
+		line = &Lines[j];
+		for (i = 0; i < C_NUM; i++) line->coord[i] = (int)(Coord[i] + 0.5f);
+		line->r = R;
+		line->g = G;
+		line->b = B;
+
+		// shift header
+		j++;
+		if (j >= LINENUM) j = 0;
+		Head = j;
+
+		// shift coordinates
+		for (i = 0; i < C_NUM; i++)
+		{
+			Coord[i] += Delta[i];
+			if (Coord[i] < 0)
+			{
+				Coord[i] = 0;
+				Delta[i] = RandFloatMinMax(SPEEDMIN, SPEEDMAX);
+			}
+
+			if (Coord[i] > CoordMax[i])
+			{
+				Coord[i] = CoordMax[i];
+				Delta[i] = -RandFloatMinMax(SPEEDMIN, SPEEDMAX);
+			}
+		}
+
+		// generate new color
+		ColLen--;
+		if (ColLen <= 0)
+		{
+			ColLen = RandU8MinMax(LENMIN,LENMAX);
+
+			do {
+				R = RandU8();
+				G = RandU8();
+				B = RandU8();
+			} while (R+G+B < LEVMIN);
+		}
+	}
+}