From 141732e737eb7e9a1677fc3b5aa9ebcd66de3aca Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Mon, 30 May 2011 23:24:36 -0600 Subject: Make lights more generic to support directional lights. --- libdimension/point_light.c | 43 ++++++++++++++++++++++++++++++++++--------- 1 file changed, 34 insertions(+), 9 deletions(-) (limited to 'libdimension/point_light.c') diff --git a/libdimension/point_light.c b/libdimension/point_light.c index 8617791..6ecaa24 100644 --- a/libdimension/point_light.c +++ b/libdimension/point_light.c @@ -26,11 +26,33 @@ #include "dimension.h" #include -/** Point light callback. */ +/** Point light payload type. */ +typedef struct dmnsn_point_light_payload { + dmnsn_vector origin; + dmnsn_color color; +} dmnsn_point_light_payload; + +/** Point light direction callback. */ +static dmnsn_line +dmnsn_point_light_direction_fn(const dmnsn_light *light, dmnsn_vector v) +{ + dmnsn_point_light_payload *payload = light->ptr; + return dmnsn_new_line(v, dmnsn_vector_sub(payload->origin, v)); +} + +/** Point light illumination callback. */ static dmnsn_color -dmnsn_point_light_fn(const dmnsn_light *light, dmnsn_vector v) +dmnsn_point_light_illumination_fn(const dmnsn_light *light, dmnsn_vector v) +{ + dmnsn_point_light_payload *payload = light->ptr; + return payload->color; +} + +/** Point light illumination callback. */ +static bool +dmnsn_point_light_shadow_fn(const dmnsn_light *light, double t) { - return *(dmnsn_color *)light->ptr; + return t < 1.0; } dmnsn_light * @@ -38,13 +60,16 @@ dmnsn_new_point_light(dmnsn_vector x0, dmnsn_color color) { dmnsn_light *light = dmnsn_new_light(); - dmnsn_color *ptr = dmnsn_malloc(sizeof(dmnsn_color)); - *ptr = color; + dmnsn_point_light_payload *payload + = dmnsn_malloc(sizeof(dmnsn_point_light_payload)); + payload->origin = x0; + payload->color = color; + light->ptr = payload; - light->x0 = x0; - light->light_fn = dmnsn_point_light_fn; - light->free_fn = dmnsn_free; - light->ptr = ptr; + light->direction_fn = dmnsn_point_light_direction_fn; + light->illumination_fn = dmnsn_point_light_illumination_fn; + light->shadow_fn = dmnsn_point_light_shadow_fn; + light->free_fn = dmnsn_free; return light; } -- cgit v1.2.3