Work towards a raytracing engine.

4 files changed, 116 insertions, 2 deletions

diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am
index 136d652..857d233 100644
--- a/libdimension/Makefile.am
+++ b/libdimension/Makefile.am
@@ -17,10 +17,10 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>. ##
 ###########################################################################
 
-nobase_include_HEADERS = dimension.h dimension/array.h dimension/canvas.h dimension/color.h dimension/error.h dimension/geometry.h dimension/png.h dimension/object.h dimension/sphere.h
+nobase_include_HEADERS = dimension.h dimension/array.h dimension/canvas.h dimension/color.h dimension/error.h dimension/geometry.h dimension/png.h dimension/object.h dimension/scene.h dimension/sphere.h
 
 lib_LTLIBRARIES = libdimension.la
 
-libdimension_la_SOURCES = $(nobase_include_HEADERS) array.c canvas.c color.c error.c geometry.c png.c object.c sphere.c
+libdimension_la_SOURCES = $(nobase_include_HEADERS) array.c canvas.c color.c error.c geometry.c png.c object.c scene.c sphere.c
 libdimension_la_LDFLAGS = -version-info 0:0:0
 libdimension_la_LIBADD  = -lm -lpthread -lpng
diff --git a/libdimension/dimension.h b/libdimension/dimension.h
index 50e1544..e7fbe55 100644
--- a/libdimension/dimension.h
+++ b/libdimension/dimension.h
@@ -32,6 +32,7 @@ extern "C" {
 #include <dimension/color.h>
 #include <dimension/canvas.h>
 #include <dimension/object.h>
+#include <dimension/scene.h>
 #include <dimension/png.h>
 
 #ifdef __cplusplus
diff --git a/libdimension/dimension/scene.h b/libdimension/dimension/scene.h
new file mode 100644
index 0000000..e075cdd
--- /dev/null
+++ b/libdimension/dimension/scene.h
@@ -0,0 +1,39 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library 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  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#ifndef DIMENSION_SCENE_H
+#define DIMENSION_SCENE_H
+
+/*
+ * A scene.
+ */
+
+typedef struct {
+  dmnsn_color background;
+  dmnsn_array *objects;
+  dmnsn_canvas *canvas;
+} dmnsn_scene;
+
+dmnsn_scene *dmnsn_new_scene(unsigned int x, unsigned int y);
+void dmnsn_delete_scene(dmnsn_scene *scene);
+
+void dmnsn_raytrace_scene(dmnsn_scene *scene);
+
+#endif /* DIMENSION_SCENE_H */
diff --git a/libdimension/scene.c b/libdimension/scene.c
new file mode 100644
index 0000000..541e3ba
--- /dev/null
+++ b/libdimension/scene.c
@@ -0,0 +1,74 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library 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  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "dimension.h"
+#include <stdlib.h> /* For malloc */
+
+dmnsn_scene *
+dmnsn_new_scene(unsigned int x, unsigned int y)
+{
+  dmnsn_scene *scene = malloc(sizeof(dmnsn_scene));
+  if (scene) {
+    scene->objects = dmnsn_new_array(sizeof(dmnsn_object*));
+
+    scene->canvas = dmnsn_new_canvas(x, y);
+    if (!scene->canvas) {
+      dmnsn_delete_array(scene->objects);
+      return NULL;
+    }
+  }
+
+  return scene;
+}
+
+void
+dmnsn_delete_scene(dmnsn_scene *scene)
+{
+  if (scene) {
+    dmnsn_delete_array(scene->objects);
+    free(scene);
+  }
+}
+
+void
+dmnsn_raytrace_scene(dmnsn_scene *scene)
+{
+  unsigned int i, j;
+  dmnsn_object *object;
+  dmnsn_line l;
+
+  l.x0 = dmnsn_vector_construct(0.0, 0.0, -3.0);
+  dmnsn_array_get(scene->objects, 0, &object);
+
+  for (i = 0; i < scene->canvas->x; ++i) {
+    for (j = 0; j < scene->canvas->y; ++j) {
+      l.n.x = 1.6*(((double)i)/(scene->canvas->x - 1) - 0.5);
+      l.n.y = ((double)j)/(scene->canvas->y - 1) - 0.5;
+      l.n.z = 1.0;
+
+      if ((*object->intersections_fn)(l)->length > 0) {
+        dmnsn_set_pixel(scene->canvas, i, j,
+                        dmnsn_color_from_XYZ(dmnsn_whitepoint));
+      } else {
+        dmnsn_set_pixel(scene->canvas, i, j, scene->background);
+      }
+    }
+  }
+}