2 files changed, 150 insertions, 0 deletions
diff --git a/src/modules/swab/Makefile.am b/src/modules/swab/Makefile.am
new file mode 100644
index 0000000..4db914b
--- /dev/null
+++ b/src/modules/swab/Makefile.am
@@ -0,0 +1,3 @@
+noinst_LIBRARIES = libswab.a
+libswab_a_SOURCES = swab.c
+libswab_a_CPPFLAGS = -I@top_srcdir@/src -I@top_srcdir@/src/libs
diff --git a/src/modules/swab/swab.c b/src/modules/swab/swab.c
new file mode 100644
index 0000000..6528900
--- /dev/null
+++ b/src/modules/swab/swab.c
@@ -0,0 +1,147 @@
+/*
+ *  Copyright (C) 2019 - Vito Caputo - <vcaputo@pengaru.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 3 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "din/din.h"
+
+#include "fb.h"
+#include "rototiller.h"
+#include "util.h"
+
+
+typedef struct swab_context_t {
+	din_t		*din;
+	float		r;
+	unsigned	n_cpus;
+} swab_context_t;
+
+typedef struct color_t {
+	float	r,g,b;
+} color_t;
+
+
+/* convert a color into a packed, 32-bit rgb pixel value (taken from libs/ray/ray_color.h) */
+static inline uint32_t color_to_uint32(color_t color) {
+	uint32_t	pixel;
+
+	if (color.r > 1.0f) color.r = 1.0f;
+	if (color.g > 1.0f) color.g = 1.0f;
+	if (color.b > 1.0f) color.b = 1.0f;
+
+	if (color.r < .0f) color.r = .0f;
+	if (color.g < .0f) color.g = .0f;
+	if (color.b < .0f) color.b = .0f;
+
+	pixel = (uint32_t)(color.r * 255.0f);
+	pixel <<= 8;
+	pixel |= (uint32_t)(color.g * 255.0f);
+	pixel <<= 8;
+	pixel |= (uint32_t)(color.b * 255.0f);
+
+	return pixel;
+}
+
+
+static void * swab_create_context(void)
+{
+	swab_context_t	*ctxt;
+
+	ctxt = calloc(1, sizeof(swab_context_t));
+	if (!ctxt)
+		return NULL;
+
+	ctxt->din = din_new(12, 12, 100);
+	if (!ctxt->din) {
+		free(ctxt);
+		return NULL;
+	}
+
+	return ctxt;
+}
+
+
+static void swab_destroy_context(void *context)
+{
+	swab_context_t	*ctxt = context;
+
+	din_free(ctxt->din);
+	free(ctxt);
+}
+
+
+static int swab_fragmenter(void *context, const fb_fragment_t *fragment, unsigned num, fb_fragment_t *res_fragment)
+{
+	swab_context_t	*ctxt = context;
+
+	return fb_fragment_slice_single(fragment, ctxt->n_cpus, num, res_fragment);
+}
+
+
+static void swab_prepare_frame(void *context, unsigned n_cpus, fb_fragment_t *fragment, rototiller_fragmenter_t *res_fragmenter)
+{
+	swab_context_t	*ctxt = context;
+
+	*res_fragmenter = swab_fragmenter;
+
+	ctxt->r += .0001f;
+	ctxt->n_cpus = n_cpus;
+}
+
+
+static void swab_render_fragment(void *context, fb_fragment_t *fragment)
+{
+	swab_context_t	*ctxt = context;
+	float		cos_r = cos(ctxt->r);
+	float		sin_r = sin(ctxt->r);
+	float		z1 = cos_r;
+	float		z2 = sin_r;
+	float		xscale = 1.f / (float)fragment->frame_width;
+	float		yscale = 1.f / (float)fragment->frame_height;
+
+	for (int y = fragment->y; y < fragment->y + fragment->height; y++) {
+		for (int x = fragment->x; x < fragment->x + fragment->width; x++) {
+			color_t		color;
+			uint32_t	pixel;
+			float		t;
+
+			t = din(ctxt->din, (v3f_t){ .x = (float)x * xscale * .5f, .y = (float)y * yscale * .5f, .z = -z2 }) * 33.f;
+
+			color.r = din(ctxt->din, (v3f_t){ .x = (float)x * xscale * .7f, .y = (float)y * yscale * .7f, .z = z1 }) * t;
+			color.g = din(ctxt->din, (v3f_t){ .x = (float)x * xscale * .93f, .y = (float)y * yscale * .93f, .z = -z1 }) * t;
+			color.b = din(ctxt->din, (v3f_t){ .x = (float)x * xscale * .81f, .y = (float)y * yscale * .81f, .z = z2 }) * t;
+
+			pixel = color_to_uint32(color);
+			fb_fragment_put_pixel_unchecked(fragment, x, y, pixel);
+		}
+	}
+}
+
+
+rototiller_module_t	swab_module = {
+	.create_context = swab_create_context,
+	.destroy_context = swab_destroy_context,
+	.prepare_frame = swab_prepare_frame,
+	.render_fragment = swab_render_fragment,
+	.name = "swab",
+	.description = "Colorful perlin-noise visualization (threaded)",
+	.author = "Vito Caputo <vcaputo@pengaru.com>",
+	.license = "GPLv3",
+};