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-rw-r--r--libdimension/raytrace.c76
1 files changed, 39 insertions, 37 deletions
diff --git a/libdimension/raytrace.c b/libdimension/raytrace.c
index 7c3637e..03dcbab 100644
--- a/libdimension/raytrace.c
+++ b/libdimension/raytrace.c
@@ -183,6 +183,10 @@ dmnsn_raytrace_scene_multithread_thread(void *ptr)
return retval;
}
+/* Helper for dmnsn_raytrace_scene_impl - shoot a ray */
+static dmnsn_color dmnsn_raytrace_shoot(dmnsn_scene *scene, dmnsn_color color,
+ unsigned int x, unsigned int y);
+
/*
* Actually raytrace a scene
*/
@@ -190,14 +194,9 @@ static int
dmnsn_raytrace_scene_impl(dmnsn_progress *progress, dmnsn_scene *scene,
unsigned int index, unsigned int threads)
{
- unsigned int x, y, i, j;
+ unsigned int x, y;
unsigned int width, height;
- double t, t_temp;
- dmnsn_object *object;
- dmnsn_line ray, ray_trans;
- dmnsn_array *intersections;
dmnsn_color color;
- dmnsn_CIE_Lab Lab = { 0.0, 0.0, 0.0 }; /* Shut up uninitialized use warning */
width = scene->canvas->x;
height = scene->canvas->y;
@@ -210,46 +209,49 @@ dmnsn_raytrace_scene_impl(dmnsn_progress *progress, dmnsn_scene *scene,
for (x -= width; x < width; x += threads) {
/* Set the pixel to the background color */
color = scene->background;
- t = -1.0;
- /* Get the ray corresponding to the (x,y)'th pixel */
- ray = (*scene->camera->ray_fn)(scene->camera, scene->canvas, x, y);
+ if (scene->quality >= DMNSN_RENDER_OBJECTS) {
+ color = dmnsn_raytrace_shoot(scene, color, x, y);
+ }
- for (i = 0; i < dmnsn_array_size(scene->objects); ++i) {
- dmnsn_array_get(scene->objects, i, &object);
+ dmnsn_set_pixel(scene->canvas, x, y, color);
+ }
- /* Transform the ray according to the object */
- ray_trans = dmnsn_matrix_line_mul(object->trans, ray);
+ dmnsn_increment_progress(progress);
+ }
- /* Test for intersections with objects */
- intersections = (*object->intersections_fn)(object, ray_trans);
- /* Find the closest intersection */
- for (j = 0; j < dmnsn_array_size(intersections); ++j) {
- dmnsn_array_get(intersections, j, &t_temp);
- if ((t_temp < t && t_temp >= 0.0) || t < 0.0) {
- t = t_temp;
+ return 0;
+}
- /* Color each object differently */
- Lab.a = sin((double)(i + 8));
- Lab.b = cos((double)(i + 8));
- }
- }
- dmnsn_delete_array(intersections);
- }
+/* Shoot a ray, and calculate the color, using `color' as the background */
+static dmnsn_color
+dmnsn_raytrace_shoot(dmnsn_scene *scene, dmnsn_color color,
+ unsigned int x, unsigned int y)
+{
+ dmnsn_line ray, ray_trans;
+ dmnsn_object *object;
+ dmnsn_array *intersections;
+ unsigned int i;
- /* Shade according to distance from camera */
- if (t >= 0.0) {
- Lab.L = 100.0*(1.0 - (t - 2.25)/2.25);
- Lab.a *= Lab.L/1.1;
- Lab.b *= Lab.L/1.1;
- color = dmnsn_color_from_Lab(Lab, dmnsn_whitepoint);
- }
+ /* Get the ray corresponding to the (x,y)'th pixel */
+ ray = (*scene->camera->ray_fn)(scene->camera, scene->canvas, x, y);
- dmnsn_set_pixel(scene->canvas, x, y, color);
+ for (i = 0; i < dmnsn_array_size(scene->objects); ++i) {
+ dmnsn_array_get(scene->objects, i, &object);
+
+ /* Transform the ray according to the object */
+ ray_trans = dmnsn_matrix_line_mul(object->trans, ray);
+
+ /* Test for intersections with objects */
+ intersections = (*object->intersections_fn)(object, ray_trans);
+
+ if (dmnsn_array_size(intersections) > 0) {
+ color = dmnsn_color_from_XYZ(dmnsn_whitepoint);
}
- dmnsn_increment_progress(progress);
+ /* Delete the intersections array */
+ dmnsn_delete_array(intersections);
}
- return 0;
+ return color;
}