summaryrefslogtreecommitdiffstats
path: root/libdimension/model/finishes
diff options
context:
space:
mode:
Diffstat (limited to 'libdimension/model/finishes')
-rw-r--r--libdimension/model/finishes/lambertian.c57
-rw-r--r--libdimension/model/finishes/phong.c69
-rw-r--r--libdimension/model/finishes/reflection.c64
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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-31 23:53:46 +0000