plasma demo

userspace/Makefile

@@ -27,7 +27,7 @@ LIBM = ${TOOLCHAIN}/lib/libm.a
 LIBZ = ${TOOLCHAIN}/lib/libz.a
 
 TARGETDIR = ../hdd/bin/
-ETARGETS = terminal login compositor view game drawlines glogin julia solver wallpaper panel glock clock-win draw test-gfx threadtest bim blur_test test-borders serial-console ls
+ETARGETS = terminal login compositor view game drawlines glogin julia solver wallpaper panel glock clock-win draw test-gfx threadtest bim blur_test test-borders serial-console ls plasma
 FTARGETS = $(ETARGETS:%=$(TARGETDIR)%)
 
 LOCAL_LIBS = $(patsubst %.c,%.o,$(wildcard lib/*.c))

userspace/plasma.c

@@ -0,0 +1,130 @@
+/*
+ * test-gfx
+ *
+ * Windowed graphical test application.
+ */
+#include <stdlib.h>
+#include <assert.h>
+#include <math.h>
+
+#include "lib/window.h"
+#include "lib/graphics.h"
+#include "lib/decorations.h"
+
+#define dist(a,b,c,d) sqrt((double)(((a) - (c)) * ((a) - (c)) + ((b) - (d)) * ((b) - (d))))
+
+window_t * wina;
+
+uint16_t win_width;
+uint16_t win_height;
+
+uint16_t off_x;
+uint16_t off_y;
+
+gfx_context_t * ctx;
+
+void redraw_borders() {
+	render_decorations(wina, ctx, "Graphics Test");
+}
+
+void resize_callback(window_t * window) {
+	win_width  = window->width  - decor_width();
+	win_height = window->height - decor_height();
+	reinit_graphics_window(ctx, wina);
+	draw_fill(ctx, rgb(0,0,0));
+	redraw_borders();
+	flip(ctx);
+}
+
+uint32_t hsv_to_rgb(int h, float s, float v) {
+	float c  = v * s;
+	float hp = (float)h / 42.6666666f;
+	float x = c * (1.0 - fabs(fmod(hp, 2) - 1.0));
+	float m = v - c;
+	float rp, gp, bp;
+	if (hp < 1.0)      { rp = c; gp = x; bp = 0; }
+	else if (hp < 2.0) { rp = x; gp = c; bp = 0; }
+	else if (hp < 3.0) { rp = 0; gp = c; bp = x; }
+	else if (hp < 4.0) { rp = 0; gp = x; bp = c; }
+	else if (hp < 5.0) { rp = x; gp = 0; bp = c; }
+	else if (hp < 6.0) { rp = c; gp = 0; bp = x; }
+	else               { rp = 0; gp = 0; bp = 0; }
+	return rgb((rp + m) * 255, (gp + m) * 255, (bp + m) * 255);
+}
+
+int main (int argc, char ** argv) {
+	char * _windowed = getenv("DISPLAY");
+	if (_windowed) {
+		setup_windowing();
+		resize_window_callback = resize_callback;
+
+		win_width  = 500;
+		win_height = 500;
+
+		init_decorations();
+
+		off_x = decor_left_width;
+		off_y = decor_top_height;
+
+		/* Do something with a window */
+		wina = window_create(300, 300, win_width + decor_width(), win_height + decor_height());
+		assert(wina);
+		ctx = init_graphics_window_double_buffer(wina);
+	} else {
+		ctx = init_graphics_fullscreen_double_buffer();
+		win_width  = ctx->width;
+		win_height = ctx->height;
+
+		off_x = 0;
+		off_y = 0;
+	}
+
+	draw_fill(ctx, rgb(0,0,0));
+	redraw_borders();
+	flip(ctx);
+
+	double time;
+
+	/* Generate a palette */
+	uint32_t palette[256];
+	for (int x = 0; x < 256; ++x) {
+		palette[x] = hsv_to_rgb(x,1.0,1.0);
+	}
+
+	while (1) {
+		if (_windowed) {
+			w_keyboard_t * kbd = poll_keyboard_async();
+			if (kbd) {
+				char ch = kbd->key;
+				free(kbd);
+				if (ch == 'q') {
+					goto done;
+					break;
+				}
+			}
+		}
+
+		time += 1.0;
+
+		int w = win_width;
+		int h = win_height;
+
+		for (int x = 0; x < win_width; ++x) {
+			for (int y = 0; y < win_height; ++y) {
+				double value = sin(dist(x + time, y, 128.0, 128.0) / 8.0)
+					+ sin(dist(x, y, 64.0, 64.0) / 8.0)
+					+ sin(dist(x, y + time / 7, 192.0, 64) / 7.0)
+					+ sin(dist(x, y, 192.0, 100.0) / 8.0);
+				GFX(ctx, x + off_x, y + off_y) = palette[(int)((value + 4) * 32)];
+			}
+		}
+		redraw_borders();
+		flip(ctx);
+	}
+done:
+
+	if (_windowed) {
+		teardown_windowing();
+	}
+	return 0;
+}