- if (p->state->unit[i].light_eyepos3_is_zero) {
- /* Can used precomputed constants in this case.
- * Attenuation never applies to infinite lights.
- */
- VPpli = register_param3(p, STATE_INTERNAL,
- STATE_LIGHT_POSITION_NORMALIZED, i);
-
- if (!p->state->material_shininess_is_zero) {
- if (p->state->light_local_viewer) {
- struct ureg eye_hat = get_eye_position_normalized(p);
- half = get_temp(p);
- emit_op2(p, OPCODE_SUB, half, 0, VPpli, eye_hat);
- emit_normalize_vec3(p, half, half);
- }
- else {
- half = register_param3(p, STATE_INTERNAL,
- STATE_LIGHT_HALF_VECTOR, i);
- }
- }
- }
- else {
- struct ureg Ppli = register_param3(p, STATE_INTERNAL,
- STATE_LIGHT_POSITION, i);
- struct ureg V = get_eye_position(p);
- struct ureg dist = get_temp(p);
-
- VPpli = get_temp(p);
-
- /* Calculate VPpli vector
- */
- emit_op2(p, OPCODE_SUB, VPpli, 0, Ppli, V);
-
- /* Normalize VPpli. The dist value also used in
- * attenuation below.
- */
- emit_op2(p, OPCODE_DP3, dist, 0, VPpli, VPpli);
- emit_op1(p, OPCODE_RSQ, dist, 0, dist);
- emit_op2(p, OPCODE_MUL, VPpli, 0, VPpli, dist);
-
- /* Calculate attenuation:
- */
- if (!p->state->unit[i].light_spotcutoff_is_180 ||
- p->state->unit[i].light_attenuated) {
- att = calculate_light_attenuation(p, i, VPpli, dist);
- }
-
- /* Calculate viewer direction, or use infinite viewer:
- */
- if (!p->state->material_shininess_is_zero) {
- half = get_temp(p);
+ /* Normalize VPpli. The dist value also used in
+ * attenuation below.
+ */
+ emit_op2(p, OPCODE_DP3, dist, 0, VPpli, VPpli);
+ emit_op1(p, OPCODE_RSQ, dist, 0, dist);
+ emit_op2(p, OPCODE_MUL, VPpli, 0, VPpli, dist);
+ }