diff options
Diffstat (limited to 'libdimension/raytrace.c')
| -rw-r--r-- | libdimension/raytrace.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/libdimension/raytrace.c b/libdimension/raytrace.c index 4056f07..3b83618 100644 --- a/libdimension/raytrace.c +++ b/libdimension/raytrace.c @@ -229,8 +229,9 @@ dmnsn_trace_pigment(dmnsn_rtstate *state) } /** Get the color of a light ray at an intersection point. */ -static dmnsn_color -dmnsn_trace_light_ray(dmnsn_rtstate *state, const dmnsn_light *light) +static bool +dmnsn_trace_light_ray(dmnsn_rtstate *state, const dmnsn_light *light, + dmnsn_color *color) { /** @todo: Start at the light source */ dmnsn_line shadow_ray = dmnsn_new_line( @@ -244,21 +245,23 @@ dmnsn_trace_light_ray(dmnsn_rtstate *state, const dmnsn_light *light) /* Check if we're casting a shadow on ourself */ if (dmnsn_vector_dot(shadow_ray.n, state->intersection->normal) * dmnsn_vector_dot(state->viewer, state->intersection->normal) < 0.0) - return dmnsn_black; + { + return false; + } - dmnsn_color color = light->illumination_fn(light, state->r); + *color = light->illumination_fn(light, state->r); /* Test for shadow ray intersections */ unsigned int reclevel = state->reclevel; while (reclevel-- > 0 - && dmnsn_color_intensity(color) >= state->scene->adc_bailout) + && dmnsn_color_intensity(*color) >= state->scene->adc_bailout) { dmnsn_intersection shadow_caster; bool shadow_was_cast = dmnsn_prtree_intersection(state->prtree, shadow_ray, &shadow_caster, false); if (!shadow_was_cast || !light->shadow_fn(light, shadow_caster.t)) { - return color; + return true; } /* Handle transparency */ @@ -273,14 +276,14 @@ dmnsn_trace_light_ray(dmnsn_rtstate *state, const dmnsn_light *light) shadow_state.texture->finish.reflection; if ((state->scene->quality & DMNSN_RENDER_REFLECTION) && reflection) { dmnsn_color reflected = reflection->reflection_fn( - reflection, color, shadow_state.pigment, shadow_state.reflected, + reflection, *color, shadow_state.pigment, shadow_state.reflected, shadow_state.intersection->normal ); - color = dmnsn_color_sub(color, reflected); + *color = dmnsn_color_sub(*color, reflected); } /* Filter the light */ - color = dmnsn_filter_light(color, shadow_state.pigment); + *color = dmnsn_filter_light(*color, shadow_state.pigment); shadow_ray.x0 = dmnsn_line_point(shadow_ray, shadow_caster.t); shadow_ray.n = light->direction_fn(light, shadow_ray.x0); shadow_ray = dmnsn_line_add_epsilon(shadow_ray); @@ -291,7 +294,7 @@ dmnsn_trace_light_ray(dmnsn_rtstate *state, const dmnsn_light *light) break; } - return dmnsn_black; + return false; } /** Handle light, shadow, and shading. */ @@ -309,8 +312,8 @@ dmnsn_trace_lighting(dmnsn_rtstate *state) /* Iterate over each light */ DMNSN_ARRAY_FOREACH (dmnsn_light **, light, state->scene->lights) { - dmnsn_color light_color = dmnsn_trace_light_ray(state, *light); - if (!dmnsn_color_is_black(light_color)) { + dmnsn_color light_color; + if (dmnsn_trace_light_ray(state, *light, &light_color)) { if (state->scene->quality & DMNSN_RENDER_FINISH) { /* Reflect the light */ const dmnsn_reflection *reflection = state->texture->finish.reflection; |