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authorTavian Barnes <tavianator@gmail.com>2010-01-08 00:47:39 -0500
committerTavian Barnes <tavianator@gmail.com>2010-01-08 00:47:39 -0500
commit397f66bf47dabb6cb6ec9f5757189f875c6151c6 (patch)
tree57faed706e2d91d54f601e5399181bd708112f56
parent4e38691f65d2f780910b2440393811d908ada534 (diff)
downloaddimension-397f66bf47dabb6cb6ec9f5757189f875c6151c6.tar.xz
Modularize translucency.
-rw-r--r--libdimension/raytrace.c60
1 files changed, 32 insertions, 28 deletions
diff --git a/libdimension/raytrace.c b/libdimension/raytrace.c
index f37c3a7..c9dc285 100644
--- a/libdimension/raytrace.c
+++ b/libdimension/raytrace.c
@@ -223,8 +223,7 @@ typedef struct dmnsn_raytrace_state {
/* Main helper for dmnsn_raytrace_scene_impl - shoot a ray */
static dmnsn_color dmnsn_raytrace_shoot(dmnsn_raytrace_state *state,
- dmnsn_line ray, dmnsn_color background,
- unsigned int level);
+ dmnsn_line ray, unsigned int level);
/* Actually raytrace a scene */
static int
@@ -256,7 +255,7 @@ dmnsn_raytrace_scene_impl(dmnsn_progress *progress, dmnsn_scene *scene,
((double)y)/(scene->canvas->y - 1)
);
/* Shoot a ray */
- color = dmnsn_raytrace_shoot(&state, ray, color, 10);
+ color = dmnsn_raytrace_shoot(&state, ray, 10);
}
dmnsn_set_pixel(scene->canvas, x, y, color);
@@ -421,10 +420,33 @@ dmnsn_raytrace_lighting(const dmnsn_raytrace_state *state, dmnsn_color color,
return illum;
}
+static dmnsn_color
+dmnsn_raytrace_translucency(const dmnsn_raytrace_state *state,
+ dmnsn_color color, dmnsn_color pigment,
+ unsigned int level)
+{
+ dmnsn_color trans = color;
+ if (pigment.filter || pigment.trans) {
+ trans = dmnsn_color_mul(1.0 - pigment.filter - pigment.trans, color);
+
+ dmnsn_line trans_ray = dmnsn_new_line(
+ dmnsn_line_point(state->intersection->ray, state->intersection->t),
+ state->intersection->ray.n
+ );
+ trans_ray = dmnsn_line_add_epsilon(trans_ray);
+
+ dmnsn_raytrace_state recursive_state = *state;
+ dmnsn_color rec = dmnsn_raytrace_shoot(&recursive_state, trans_ray, level);
+ dmnsn_color filtered = dmnsn_color_filter(rec, pigment);
+ trans = dmnsn_color_add(trans, filtered);
+ }
+ return trans;
+}
+
/* Shoot a ray, and calculate the color, using `color' as the background */
static dmnsn_color
dmnsn_raytrace_shoot(dmnsn_raytrace_state *state, dmnsn_line ray,
- dmnsn_color background, unsigned int level)
+ unsigned int level)
{
if (level <= 0)
return dmnsn_black;
@@ -433,7 +455,7 @@ dmnsn_raytrace_shoot(dmnsn_raytrace_state *state, dmnsn_line ray,
dmnsn_intersection *intersection
= dmnsn_kD_splay_search(state->kD_splay_tree, ray);
- dmnsn_color color = background;
+ dmnsn_color color = state->scene->background;
if (intersection) {
state->intersection = intersection;
@@ -443,38 +465,20 @@ dmnsn_raytrace_shoot(dmnsn_raytrace_state *state, dmnsn_line ray,
pigment = dmnsn_raytrace_pigment(state);
}
color = pigment;
- color.filter = 0.0;
- color.trans = 0.0;
/* Account for finishes and shadows */
dmnsn_color illum = pigment;
if (state->scene->quality & DMNSN_RENDER_LIGHTS) {
- illum = dmnsn_raytrace_lighting(state, pigment, level);
+ illum = dmnsn_raytrace_lighting(state, illum, level);
}
color = illum;
- color.filter = 0.0;
- color.trans = 0.0;
/* Account for translucency */
dmnsn_color trans = illum;
- if (state->scene->quality & DMNSN_RENDER_TRANSLUCENCY
- && (pigment.filter || pigment.trans))
- {
- trans = dmnsn_color_mul(1.0 - pigment.filter - pigment.trans, illum);
- trans.filter = 0.0;
- trans.trans = 0.0;
-
- dmnsn_line trans_ray = dmnsn_new_line(
- dmnsn_line_point(ray, intersection->t),
- ray.n
- );
- trans_ray = dmnsn_line_add_epsilon(trans_ray);
-
- dmnsn_raytrace_state recursive_state = *state;
- dmnsn_color rec
- = dmnsn_raytrace_shoot(&recursive_state, trans_ray, background, level);
- dmnsn_color filtered = dmnsn_color_filter(rec, pigment);
- trans = dmnsn_color_add(trans, filtered);
+ trans.filter = 0.0;
+ trans.trans = 0.0;
+ if (state->scene->quality & DMNSN_RENDER_TRANSLUCENCY) {
+ trans = dmnsn_raytrace_translucency(state, trans, pigment, level);
}
color = trans;