Modularize the libdimension codebase.

3 files changed, 190 insertions, 0 deletions

diff --git a/libdimension/model/finishes/lambertian.c b/libdimension/model/finishes/lambertian.c
new file mode 100644
index 0000000..9e041ed
--- /dev/null
+++ b/libdimension/model/finishes/lambertian.c
@@ -0,0 +1,57 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.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/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Diffuse finish.
+ */
+
+#include "dimension/model.h"
+#include <math.h>
+#include <stdlib.h>
+
+/// Lambertian diffuse type.
+typedef struct dmnsn_lambertian {
+  dmnsn_diffuse diffuse;
+  double coeff;
+} dmnsn_lambertian;
+
+/// Diffuse finish callback.
+static dmnsn_color
+dmnsn_lambertian_diffuse_fn(const dmnsn_diffuse *diffuse,
+                            dmnsn_color light, dmnsn_color color,
+                            dmnsn_vector ray, dmnsn_vector normal)
+{
+  const dmnsn_lambertian *lambertian = (const dmnsn_lambertian *)diffuse;
+  double diffuse_factor = fabs((lambertian->coeff)*dmnsn_vector_dot(ray, normal));
+  return dmnsn_color_mul(diffuse_factor, dmnsn_color_illuminate(light, color));
+}
+
+dmnsn_diffuse *
+dmnsn_new_lambertian(dmnsn_pool *pool, double coeff)
+{
+  dmnsn_lambertian *lambertian = DMNSN_PALLOC(pool, dmnsn_lambertian);
+  lambertian->coeff = coeff;
+
+  dmnsn_diffuse *diffuse = &lambertian->diffuse;
+  dmnsn_init_diffuse(diffuse);
+  diffuse->diffuse_fn = dmnsn_lambertian_diffuse_fn;
+  return diffuse;
+}
diff --git a/libdimension/model/finishes/phong.c b/libdimension/model/finishes/phong.c
new file mode 100644
index 0000000..6b1b1e1
--- /dev/null
+++ b/libdimension/model/finishes/phong.c
@@ -0,0 +1,69 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.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/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Phong highlights.
+ */
+
+#include "dimension/model.h"
+#include <stdlib.h>
+
+/// Phone specular type.
+typedef struct dmnsn_phong {
+  dmnsn_specular specular;
+  double coeff;
+  double exp;
+} dmnsn_phong;
+
+/// Phong specular highlight callback.
+static dmnsn_color
+dmnsn_phong_specular_fn(const dmnsn_specular *specular,
+                        dmnsn_color light, dmnsn_color color,
+                        dmnsn_vector ray, dmnsn_vector normal,
+                        dmnsn_vector viewer)
+{
+  const dmnsn_phong *phong = (const dmnsn_phong *)specular;
+
+  dmnsn_vector proj = dmnsn_vector_mul(2*dmnsn_vector_dot(ray, normal), normal);
+  dmnsn_vector reflected = dmnsn_vector_sub(proj, ray);
+
+  double specular_factor = dmnsn_vector_dot(reflected, viewer);
+  if (specular_factor < 0.0) {
+    return dmnsn_black;
+  }
+
+  specular_factor = pow(specular_factor, phong->exp);
+  return dmnsn_color_mul(phong->coeff*specular_factor, light);
+}
+
+// A phong finish
+dmnsn_specular *
+dmnsn_new_phong(dmnsn_pool *pool, double coeff, double exp)
+{
+  dmnsn_phong *phong = DMNSN_PALLOC(pool, dmnsn_phong);
+  phong->coeff = coeff;
+  phong->exp = exp;
+
+  dmnsn_specular *specular = &phong->specular;
+  dmnsn_init_specular(specular);
+  specular->specular_fn = dmnsn_phong_specular_fn;
+  return specular;
+}
diff --git a/libdimension/model/finishes/reflection.c b/libdimension/model/finishes/reflection.c
new file mode 100644
index 0000000..afaae8f
--- /dev/null
+++ b/libdimension/model/finishes/reflection.c
@@ -0,0 +1,64 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.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/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Reflective finish.
+ */
+
+#include "dimension/model.h"
+#include <math.h>
+#include <stdlib.h>
+
+/// Basic reflective finish type.
+typedef struct dmnsn_basic_reflection {
+  dmnsn_reflection reflection;
+  dmnsn_color min, max;
+  double falloff;
+} dmnsn_basic_reflection;
+
+/// Reflective finish callback.
+static dmnsn_color
+dmnsn_basic_reflection_fn(const dmnsn_reflection *reflection,
+                          dmnsn_color reflect, dmnsn_color color,
+                          dmnsn_vector ray, dmnsn_vector normal)
+{
+  const dmnsn_basic_reflection *basic = (const dmnsn_basic_reflection *)reflection;
+  double coeff = pow(fabs(dmnsn_vector_dot(ray, normal)), basic->falloff);
+
+  return dmnsn_color_illuminate(
+    dmnsn_color_gradient(basic->min, basic->max, coeff),
+    reflect
+  );
+}
+
+dmnsn_reflection *
+dmnsn_new_basic_reflection(dmnsn_pool *pool, dmnsn_color min, dmnsn_color max, double falloff)
+{
+  dmnsn_basic_reflection *basic = DMNSN_PALLOC(pool, dmnsn_basic_reflection);
+  basic->min = min;
+  basic->max = max;
+  basic->falloff = falloff;
+
+  dmnsn_reflection *reflection = &basic->reflection;
+  dmnsn_init_reflection(reflection);
+  reflection->reflection_fn = dmnsn_basic_reflection_fn;
+  return reflection;
+}