From 78275917cb7636f5760c028f1c0dfc3397e2b6a3 Mon Sep 17 00:00:00 2001
From: Timo Kokkonen <kaapeli@itanic.dy.fi>
Date: Sat, 30 Apr 2011 22:38:09 +0300
Subject: [PATCH] Initial commit

Signed-off-by: Timo Kokkonen <kaapeli@itanic.dy.fi>
---
 .gitignore   |  5 ++++
 Makefile     | 61 ++++++++++++++++++++++++++++++++++++++
 mandelbrot.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 149 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 mandelbrot.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5262bf0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.*.o.d
+mandelbrot
+debug-mandelbrot
+*.o
+*~
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..cb2543b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,61 @@
+SDL_CONFIG = $(shell sdl-config --cflags)
+SDL_LIBS = $(shell sdl-config --libs)
+CFLAGS = $(SDL_CONFIG) -Wall -O2 -g
+
+LIBS = $(SDL_LIBS) -lm -lrt
+
+CC = gcc
+
+MANDELBROT_OBJS = mandelbrot.o
+MANDELBROT_DEBUG_OBJS = $(patsubst %.o,%-debug.o,$(MANDELBROT_OBJS))
+ALL_OBJS = $(MANDELBROT_OBJS) $(MANDELBROT_DEBUG_OBJS)
+ALL_DEBS = $(patsubst %.o,.%.o.d,$(ALL_OBJS))
+
+ifeq ($(V),1)
+	Q		=
+	QUIET_CC	=
+	QUIET_LINK	=
+else
+	Q		= @
+	QUIET_CC	= @echo "       CC " $@;
+	QUIET_LINK	= @echo "     LINK " $@;
+endif
+
+mandelbrot: $(MANDELBROT_OBJS)
+	$(QUIET_LINK)$(CC) $(LIBS) -o $@ $(MANDELBROT_OBJS)
+
+debug-mandelbrot: $(MANDELBROT_DEBUG_OBJS)
+	$(QUIET_LINK)$(CC) $(LIBS) -o $@ $(MANDELBROT_DEBUG_OBJS) -DDEBUG
+
+.c.o:
+	$(QUIET_CC)$(CC) -MMD -MF .$@.d $(CFLAGS) -c $< -o $@
+	$(Q)cp .$@.d .$@.P; \
+            sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
+                -e '/^$$/ d' -e 's/$$/ :/' < .$@.d >> .$@.P; \
+            mv .$@.P .$@.d
+
+ifeq ($(C),1)
+	sparse $(CFLAGS) $<
+endif
+ifeq ($(C),2)
+	$(CHECKPATCH) -f $<
+endif
+
+%-debug.o: %.c
+	$(QUIET_CC)$(CC) -MMD -MF .$@.d $(CFLAGS) -DDEBUG -O0 -c $< -o $@
+	$(Q)cp .$@.d .$@.P; \
+            sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
+                -e '/^$$/ d' -e 's/$$/ :/' < .$@.d >> .$@.P; \
+            mv .$@.P .$@.d
+
+TAGS:
+	@echo "     TAGS"
+	$(Q)etags *.[ch]
+
+clean:
+	rm -rfv $(ALL_OBJS) *~ mandelbrot TAGS $(ALL_DEBS) \
+		debug-mandelbrot
+
+.PHONY: all clean TAGS
+
+-include $(ALL_DEBS)
diff --git a/mandelbrot.c b/mandelbrot.c
new file mode 100644
index 0000000..ef17b9e
--- /dev/null
+++ b/mandelbrot.c
@@ -0,0 +1,83 @@
+#include <SDL.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <time.h>
+
+static void putpixel(struct SDL_Surface *screen, const int x, const int y,
+		     const unsigned char r, const unsigned char g,
+		     const unsigned char b)
+{
+	int offset = y * screen->pitch + x * 4;
+	unsigned char *buf = screen->pixels;
+
+	buf[offset++] = b;
+	buf[offset++] = g;
+	buf[offset]   = r;
+}
+
+#define MAX_ITERATION 1000
+
+int draw_mandelbrot(struct SDL_Surface *screen)
+{
+	double x, y, x0, y0, xtemp;
+	int iteration, xs,ys;
+
+	for (ys = 0, y0 = -1; ys < screen->h;
+	     y0 += 2 / (double)screen->h, ys++) {
+		for (xs = 0, x0 = -2.5; xs < screen->w;
+		     x0 += 3 / (double)screen->w, xs++) {
+			iteration = 0;
+			x = 0;
+			y = 0;
+
+			while (x * x + y * y < 2 * 2 &&
+				iteration < MAX_ITERATION) {
+
+				xtemp = x*x - y*y + x0;
+				y = 2*x*y + y0;
+
+				x = xtemp;
+				iteration++;
+			}
+
+			if (iteration == MAX_ITERATION)
+				putpixel(screen, xs, ys, 255, 255, 255);
+			else
+				putpixel(screen, xs, ys,
+					iteration, 0, 0);
+		}
+		SDL_Flip(screen);
+	}
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	SDL_Surface *screen;
+	int flags = SDL_DOUBLEBUF | SDL_HWSURFACE | SDL_RESIZABLE;
+	int xres = 800, yres = 600;
+
+	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
+		fprintf(stderr, "Unable to initialize SDL: %s\n",
+			SDL_GetError());
+
+		return 1;
+	}
+	atexit(SDL_Quit);
+
+	screen = SDL_SetVideoMode(xres, yres, 32, flags);
+	if (screen == NULL) {
+		fprintf(stderr, "Unable to set video mode: %s\n",
+			SDL_GetError());
+		return 2;
+	}
+
+	SDL_WM_SetCaption(argv[0], NULL);
+
+	draw_mandelbrot(screen);
+
+	yres = read(0, &xres, 1);
+
+	return 0;
+}
-- 
2.45.0