Implement reflection.

4 files changed, 13 insertions, 3 deletions

diff --git a/libdimension/dimension/color.h b/libdimension/dimension/color.h
index cd44712..67fa032 100644
--- a/libdimension/dimension/color.h
+++ b/libdimension/dimension/color.h
@@ -83,6 +83,7 @@ dmnsn_sRGB    dmnsn_sRGB_from_color(dmnsn_color color);
 
 /* Perceptual color manipulation */
 dmnsn_color dmnsn_color_add(dmnsn_color color1, dmnsn_color color2);
+dmnsn_color dmnsn_color_sub(dmnsn_color color1, dmnsn_color color2);
 dmnsn_color dmnsn_color_mul(double n, dmnsn_color color);
 dmnsn_color dmnsn_color_filter(dmnsn_color color, dmnsn_color filter);
 dmnsn_color dmnsn_color_illuminate(dmnsn_color light, dmnsn_color color);
diff --git a/libdimension/dimension/finishes.h b/libdimension/dimension/finishes.h
index b836e51..399ff84 100644
--- a/libdimension/dimension/finishes.h
+++ b/libdimension/dimension/finishes.h
@@ -34,4 +34,8 @@ dmnsn_finish *dmnsn_new_diffuse_finish(double diffuse);
 /* A phong specular highlight */
 dmnsn_finish *dmnsn_new_phong_finish(double specular, double exp);
 
+/* Specular reflection */
+dmnsn_finish *dmnsn_new_reflective_finish(dmnsn_color min, dmnsn_color max,
+                                          double falloff);
+
 #endif /* DIMENSION_FINISHES_H */
diff --git a/libdimension/dimension/scene.h b/libdimension/dimension/scene.h
index d873a6d..2064792 100644
--- a/libdimension/dimension/scene.h
+++ b/libdimension/dimension/scene.h
@@ -31,6 +31,7 @@ typedef enum {
   DMNSN_RENDER_LIGHTS       = 1 << 1,
   DMNSN_RENDER_FINISH       = 1 << 2,
   DMNSN_RENDER_TRANSLUCENCY = 1 << 3,
+  DMNSN_RENDER_REFLECTION   = 1 << 4,
   DMNSN_RENDER_FULL         = ~DMNSN_RENDER_NONE
 } dmnsn_quality;
 
diff --git a/libdimension/dimension/texture.h b/libdimension/dimension/texture.h
index c5f4b3f..4b14918 100644
--- a/libdimension/dimension/texture.h
+++ b/libdimension/dimension/texture.h
@@ -63,13 +63,17 @@ typedef dmnsn_color dmnsn_finish_fn(const dmnsn_finish *finish,
                                     dmnsn_vector viewer);
 typedef dmnsn_color dmnsn_ambient_fn(const dmnsn_finish *finish,
                                      dmnsn_color pigment);
+typedef dmnsn_color dmnsn_reflection_fn(const dmnsn_finish *finish,
+                                        dmnsn_color reflect, dmnsn_color color,
+                                        dmnsn_vector ray, dmnsn_vector normal);
 
 /* dmnsn_finish definition */
 struct dmnsn_finish {
   /* Callbacks */
-  dmnsn_finish_fn *finish_fn;
-  dmnsn_ambient_fn *ambient_fn;
-  dmnsn_free_fn *free_fn;
+  dmnsn_finish_fn     *finish_fn;
+  dmnsn_ambient_fn    *ambient_fn;
+  dmnsn_reflection_fn *reflection_fn;
+  dmnsn_free_fn       *free_fn;
 
   /* Generic pointer */
   void *ptr;