diff options
Diffstat (limited to 'intern/cycles/kernel/svm/svm_ies.h')
| -rw-r--r-- | intern/cycles/kernel/svm/svm_ies.h | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/intern/cycles/kernel/svm/svm_ies.h b/intern/cycles/kernel/svm/svm_ies.h index 9434c0c5505..f13527c03db 100644 --- a/intern/cycles/kernel/svm/svm_ies.h +++ b/intern/cycles/kernel/svm/svm_ies.h @@ -21,12 +21,12 @@ CCL_NAMESPACE_BEGIN ccl_device_inline float interpolate_ies_vertical( KernelGlobals *kg, int ofs, int v, int v_num, float v_frac, int h) { - /* Since lookups are performed in spherical coordinates, clamping the coordinates at the low end of v - * (corresponding to the north pole) would result in artifacts. - * The proper way of dealing with this would be to lookup the corresponding value on the other side of the pole, - * but since the horizontal coordinates might be nonuniform, this would require yet another interpolation. - * Therefore, the assumtion is made that the light is going to be symmetrical, which means that we can just take - * the corresponding value at the current horizontal coordinate. */ + /* Since lookups are performed in spherical coordinates, clamping the coordinates at the low end + * of v (corresponding to the north pole) would result in artifacts. The proper way of dealing + * with this would be to lookup the corresponding value on the other side of the pole, but since + * the horizontal coordinates might be nonuniform, this would require yet another interpolation. + * Therefore, the assumtion is made that the light is going to be symmetrical, which means that + * we can just take the corresponding value at the current horizontal coordinate. */ #define IES_LOOKUP(v) kernel_tex_fetch(__ies, ofs + h * v_num + (v)) /* If v is zero, assume symmetry and read at v=1 instead of v=-1. */ @@ -66,7 +66,8 @@ ccl_device_inline float kernel_ies_interp(KernelGlobals *kg, /* Lookup the angles to find the table position. */ int h_i, v_i; - /* TODO(lukas): Consider using bisection. Probably not worth it for the vast majority of IES files. */ + /* TODO(lukas): Consider using bisection. + * Probably not worth it for the vast majority of IES files. */ for (h_i = 0; IES_LOOKUP_ANGLE_H(h_i + 1) < h_angle; h_i++) ; for (v_i = 0; IES_LOOKUP_ANGLE_V(v_i + 1) < v_angle; v_i++) @@ -83,7 +84,8 @@ ccl_device_inline float kernel_ies_interp(KernelGlobals *kg, /* Perform cubic interpolation along the horizontal coordinate to get the intensity value. * If h_i is zero, just wrap around since the horizontal angles always go over the full circle. - * However, the last entry (360°) equals the first one, so we need to wrap around to the one before that. */ + * However, the last entry (360°) equals the first one, so we need to wrap around to the one + * before that. */ float a = interpolate_ies_vertical( kg, ofs, v_i, v_num, v_frac, (h_i == 0) ? h_num - 2 : h_i - 1); float b = interpolate_ies_vertical(kg, ofs, v_i, v_num, v_frac, h_i); |