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authorTavian Barnes <tavianator@gmail.com>2011-05-30 23:24:36 -0600
committerTavian Barnes <tavianator@gmail.com>2011-05-30 23:43:03 -0600
commit141732e737eb7e9a1677fc3b5aa9ebcd66de3aca (patch)
tree196dabb31b85b92951e48462a425a58328350319 /libdimension/dimension/light.h
parent54585ba35adc6afc46201b746401c5a8a66ab6fa (diff)
downloaddimension-141732e737eb7e9a1677fc3b5aa9ebcd66de3aca.tar.xz
Make lights more generic to support directional lights.
Diffstat (limited to 'libdimension/dimension/light.h')
-rw-r--r--libdimension/dimension/light.h35
1 files changed, 29 insertions, 6 deletions
diff --git a/libdimension/dimension/light.h b/libdimension/dimension/light.h
index 03de641..b41a524 100644
--- a/libdimension/dimension/light.h
+++ b/libdimension/dimension/light.h
@@ -23,27 +23,50 @@
* Lights.
*/
+#include <stdbool.h>
+
/* Forward-declar dmnsn_light */
typedef struct dmnsn_light dmnsn_light;
/**
- * Light callback.
+ * Light direction callback.
+ * @param[in] light The light itself.
+ * @param[in] v The point to illuminate.
+ * @return The direction of light rays pointing from \p v
+ */
+typedef dmnsn_line dmnsn_light_direction_fn(const dmnsn_light *light,
+ dmnsn_vector v);
+
+/**
+ * Light illumination callback.
* @param[in] light The light itself.
* @param[in] v The point to illuminate.
* @return The color of the light at \p v.
*/
-typedef dmnsn_color dmnsn_light_fn(const dmnsn_light *light, dmnsn_vector v);
+typedef dmnsn_color dmnsn_light_illumination_fn(const dmnsn_light *light,
+ dmnsn_vector v);
+
+/**
+ * Light shadow callback.
+ * @param[in] light The light itself.
+ * @param[in] t The line index of the closest shadow ray intersection.
+ * @return Whether the point is in shadow.
+ */
+typedef bool dmnsn_light_shadow_fn(const dmnsn_light *light, double t);
/** A light. */
struct dmnsn_light {
- dmnsn_vector x0; /**< Origin of light rays. */
-
/* Callbacks */
- dmnsn_light_fn *light_fn; /**< Light callback. */
- dmnsn_free_fn *free_fn; /**< Desctructor callback. */
+ dmnsn_light_direction_fn *direction_fn; /**< Direction callback. */
+ dmnsn_light_illumination_fn *illumination_fn; /**< Illumination callback. */
+ dmnsn_light_shadow_fn *shadow_fn; /**< Shadow callback. */
+ dmnsn_free_fn *free_fn; /**< Desctructor callback. */
/** Generic pointer for light info. */
void *ptr;
+
+ /** @internal Reference count. */
+ dmnsn_refcount refcount;
};
/**