Page MenuHome
Differential D12864 Diff 43297 intern/cycles/kernel/svm/svm_voronoi.h

Changeset View

Standalone View

View Options

intern/cycles/kernel/svm/svm_voronoi.h

Show All 40 Lines
{ {
return fabsf(b - a); return fabsf(b - a);
} }
ccl_device void voronoi_f1_1d(float w, ccl_device void voronoi_f1_1d(float w,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float *outW) ccl_private float *outW)
{ {
float cellPosition = floorf(w); float cellPosition = floorf(w);
float localPosition = w - cellPosition; float localPosition = w - cellPosition;
float minDistance = 8.0f; float minDistance = 8.0f;
float targetOffset = 0.0f; float targetOffset = 0.0f;
float targetPosition = 0.0f; float targetPosition = 0.0f;
for (int i = -1; i <= 1; i++) { for (int i = -1; i <= 1; i++) {
Show All 11 Linesccl_device void voronoi_f1_1d(float w,
*outW = targetPosition + cellPosition; *outW = targetPosition + cellPosition;
} }
ccl_device void voronoi_smooth_f1_1d(float w, ccl_device void voronoi_smooth_f1_1d(float w,
float smoothness, float smoothness,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float *outW) ccl_private float *outW)
{ {
float cellPosition = floorf(w); float cellPosition = floorf(w);
float localPosition = w - cellPosition; float localPosition = w - cellPosition;
float smoothDistance = 8.0f; float smoothDistance = 8.0f;
float smoothPosition = 0.0f; float smoothPosition = 0.0f;
float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f); float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
for (int i = -2; i <= 2; i++) { for (int i = -2; i <= 2; i++) {
Show All 13 Linesccl_device void voronoi_smooth_f1_1d(float w,
*outColor = smoothColor; *outColor = smoothColor;
*outW = cellPosition + smoothPosition; *outW = cellPosition + smoothPosition;
} }
ccl_device void voronoi_f2_1d(float w, ccl_device void voronoi_f2_1d(float w,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float *outW) ccl_private float *outW)
{ {
float cellPosition = floorf(w); float cellPosition = floorf(w);
float localPosition = w - cellPosition; float localPosition = w - cellPosition;
float distanceF1 = 8.0f; float distanceF1 = 8.0f;
float distanceF2 = 8.0f; float distanceF2 = 8.0f;
float offsetF1 = 0.0f; float offsetF1 = 0.0f;
float positionF1 = 0.0f; float positionF1 = 0.0f;
Show All 17 Lines else if (distanceToPoint < distanceF2) {
positionF2 = pointPosition; positionF2 = pointPosition;
} }
} }
*outDistance = distanceF2; *outDistance = distanceF2;
*outColor = hash_float_to_float3(cellPosition + offsetF2); *outColor = hash_float_to_float3(cellPosition + offsetF2);
*outW = positionF2 + cellPosition; *outW = positionF2 + cellPosition;
} }
ccl_device void voronoi_distance_to_edge_1d(float w, float randomness, float *outDistance) ccl_device void voronoi_distance_to_edge_1d(float w,
float randomness,
ccl_private float *outDistance)
{ {
float cellPosition = floorf(w); float cellPosition = floorf(w);
float localPosition = w - cellPosition; float localPosition = w - cellPosition;
float midPointPosition = hash_float_to_float(cellPosition) * randomness; float midPointPosition = hash_float_to_float(cellPosition) * randomness;
float leftPointPosition = -1.0f + hash_float_to_float(cellPosition - 1.0f) * randomness; float leftPointPosition = -1.0f + hash_float_to_float(cellPosition - 1.0f) * randomness;
float rightPointPosition = 1.0f + hash_float_to_float(cellPosition + 1.0f) * randomness; float rightPointPosition = 1.0f + hash_float_to_float(cellPosition + 1.0f) * randomness;
float distanceToMidLeft = fabsf((midPointPosition + leftPointPosition) / 2.0f - localPosition); float distanceToMidLeft = fabsf((midPointPosition + leftPointPosition) / 2.0f - localPosition);
float distanceToMidRight = fabsf((midPointPosition + rightPointPosition) / 2.0f - localPosition); float distanceToMidRight = fabsf((midPointPosition + rightPointPosition) / 2.0f - localPosition);
*outDistance = min(distanceToMidLeft, distanceToMidRight); *outDistance = min(distanceToMidLeft, distanceToMidRight);
} }
ccl_device void voronoi_n_sphere_radius_1d(float w, float randomness, float *outRadius) ccl_device void voronoi_n_sphere_radius_1d(float w, float randomness, ccl_private float *outRadius)
{ {
float cellPosition = floorf(w); float cellPosition = floorf(w);
float localPosition = w - cellPosition; float localPosition = w - cellPosition;
float closestPoint = 0.0f; float closestPoint = 0.0f;
float closestPointOffset = 0.0f; float closestPointOffset = 0.0f;
float minDistance = 8.0f; float minDistance = 8.0f;
for (int i = -1; i <= 1; i++) { for (int i = -1; i <= 1; i++) {
▲ Show 20 Lines • Show All 48 Lines • ▼ Show 20 Lines else {
return 0.0f; return 0.0f;
} }
} }
ccl_device void voronoi_f1_2d(float2 coord, ccl_device void voronoi_f1_2d(float2 coord,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float2 *outPosition) ccl_private float2 *outPosition)
{ {
float2 cellPosition = floor(coord); float2 cellPosition = floor(coord);
float2 localPosition = coord - cellPosition; float2 localPosition = coord - cellPosition;
float minDistance = 8.0f; float minDistance = 8.0f;
float2 targetOffset = make_float2(0.0f, 0.0f); float2 targetOffset = make_float2(0.0f, 0.0f);
float2 targetPosition = make_float2(0.0f, 0.0f); float2 targetPosition = make_float2(0.0f, 0.0f);
for (int j = -1; j <= 1; j++) { for (int j = -1; j <= 1; j++) {
Show All 14 Linesccl_device void voronoi_f1_2d(float2 coord,
*outPosition = targetPosition + cellPosition; *outPosition = targetPosition + cellPosition;
} }
ccl_device void voronoi_smooth_f1_2d(float2 coord, ccl_device void voronoi_smooth_f1_2d(float2 coord,
float smoothness, float smoothness,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float2 *outPosition) ccl_private float2 *outPosition)
{ {
float2 cellPosition = floor(coord); float2 cellPosition = floor(coord);
float2 localPosition = coord - cellPosition; float2 localPosition = coord - cellPosition;
float smoothDistance = 8.0f; float smoothDistance = 8.0f;
float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f); float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
float2 smoothPosition = make_float2(0.0f, 0.0f); float2 smoothPosition = make_float2(0.0f, 0.0f);
for (int j = -2; j <= 2; j++) { for (int j = -2; j <= 2; j++) {
Show All 16 Linesccl_device void voronoi_smooth_f1_2d(float2 coord,
*outColor = smoothColor; *outColor = smoothColor;
*outPosition = cellPosition + smoothPosition; *outPosition = cellPosition + smoothPosition;
} }
ccl_device void voronoi_f2_2d(float2 coord, ccl_device void voronoi_f2_2d(float2 coord,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float2 *outPosition) ccl_private float2 *outPosition)
{ {
float2 cellPosition = floor(coord); float2 cellPosition = floor(coord);
float2 localPosition = coord - cellPosition; float2 localPosition = coord - cellPosition;
float distanceF1 = 8.0f; float distanceF1 = 8.0f;
float distanceF2 = 8.0f; float distanceF2 = 8.0f;
float2 offsetF1 = make_float2(0.0f, 0.0f); float2 offsetF1 = make_float2(0.0f, 0.0f);
float2 positionF1 = make_float2(0.0f, 0.0f); float2 positionF1 = make_float2(0.0f, 0.0f);
Show All 20 Lines for (int i = -1; i <= 1; i++) {
} }
} }
} }
*outDistance = distanceF2; *outDistance = distanceF2;
*outColor = hash_float2_to_float3(cellPosition + offsetF2); *outColor = hash_float2_to_float3(cellPosition + offsetF2);
*outPosition = positionF2 + cellPosition; *outPosition = positionF2 + cellPosition;
} }
ccl_device void voronoi_distance_to_edge_2d(float2 coord, float randomness, float *outDistance) ccl_device void voronoi_distance_to_edge_2d(float2 coord,
float randomness,
ccl_private float *outDistance)
{ {
float2 cellPosition = floor(coord); float2 cellPosition = floor(coord);
float2 localPosition = coord - cellPosition; float2 localPosition = coord - cellPosition;
float2 vectorToClosest = make_float2(0.0f, 0.0f); float2 vectorToClosest = make_float2(0.0f, 0.0f);
float minDistance = 8.0f; float minDistance = 8.0f;
for (int j = -1; j <= 1; j++) { for (int j = -1; j <= 1; j++) {
for (int i = -1; i <= 1; i++) { for (int i = -1; i <= 1; i++) {
Show All 22 Lines for (int i = -1; i <= 1; i++) {
normalize(perpendicularToEdge)); normalize(perpendicularToEdge));
minDistance = min(minDistance, distanceToEdge); minDistance = min(minDistance, distanceToEdge);
} }
} }
} }
*outDistance = minDistance; *outDistance = minDistance;
} }
ccl_device void voronoi_n_sphere_radius_2d(float2 coord, float randomness, float *outRadius) ccl_device void voronoi_n_sphere_radius_2d(float2 coord,
float randomness,
ccl_private float *outRadius)
{ {
float2 cellPosition = floor(coord); float2 cellPosition = floor(coord);
float2 localPosition = coord - cellPosition; float2 localPosition = coord - cellPosition;
float2 closestPoint = make_float2(0.0f, 0.0f); float2 closestPoint = make_float2(0.0f, 0.0f);
float2 closestPointOffset = make_float2(0.0f, 0.0f); float2 closestPointOffset = make_float2(0.0f, 0.0f);
float minDistance = 8.0f; float minDistance = 8.0f;
for (int j = -1; j <= 1; j++) { for (int j = -1; j <= 1; j++) {
▲ Show 20 Lines • Show All 55 Lines • ▼ Show 20 Lines else {
return 0.0f; return 0.0f;
} }
} }
ccl_device void voronoi_f1_3d(float3 coord, ccl_device void voronoi_f1_3d(float3 coord,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float3 *outPosition) ccl_private float3 *outPosition)
{ {
float3 cellPosition = floor(coord); float3 cellPosition = floor(coord);
float3 localPosition = coord - cellPosition; float3 localPosition = coord - cellPosition;
float minDistance = 8.0f; float minDistance = 8.0f;
float3 targetOffset = make_float3(0.0f, 0.0f, 0.0f); float3 targetOffset = make_float3(0.0f, 0.0f, 0.0f);
float3 targetPosition = make_float3(0.0f, 0.0f, 0.0f); float3 targetPosition = make_float3(0.0f, 0.0f, 0.0f);
for (int k = -1; k <= 1; k++) { for (int k = -1; k <= 1; k++) {
Show All 17 Linesccl_device void voronoi_f1_3d(float3 coord,
*outPosition = targetPosition + cellPosition; *outPosition = targetPosition + cellPosition;
} }
ccl_device void voronoi_smooth_f1_3d(float3 coord, ccl_device void voronoi_smooth_f1_3d(float3 coord,
float smoothness, float smoothness,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float3 *outPosition) ccl_private float3 *outPosition)
{ {
float3 cellPosition = floor(coord); float3 cellPosition = floor(coord);
float3 localPosition = coord - cellPosition; float3 localPosition = coord - cellPosition;
float smoothDistance = 8.0f; float smoothDistance = 8.0f;
float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f); float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
float3 smoothPosition = make_float3(0.0f, 0.0f, 0.0f); float3 smoothPosition = make_float3(0.0f, 0.0f, 0.0f);
for (int k = -2; k <= 2; k++) { for (int k = -2; k <= 2; k++) {
Show All 19 Linesccl_device void voronoi_smooth_f1_3d(float3 coord,
*outColor = smoothColor; *outColor = smoothColor;
*outPosition = cellPosition + smoothPosition; *outPosition = cellPosition + smoothPosition;
} }
ccl_device void voronoi_f2_3d(float3 coord, ccl_device void voronoi_f2_3d(float3 coord,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float3 *outPosition) ccl_private float3 *outPosition)
{ {
float3 cellPosition = floor(coord); float3 cellPosition = floor(coord);
float3 localPosition = coord - cellPosition; float3 localPosition = coord - cellPosition;
float distanceF1 = 8.0f; float distanceF1 = 8.0f;
float distanceF2 = 8.0f; float distanceF2 = 8.0f;
float3 offsetF1 = make_float3(0.0f, 0.0f, 0.0f); float3 offsetF1 = make_float3(0.0f, 0.0f, 0.0f);
float3 positionF1 = make_float3(0.0f, 0.0f, 0.0f); float3 positionF1 = make_float3(0.0f, 0.0f, 0.0f);
Show All 23 Lines for (int j = -1; j <= 1; j++) {
} }
} }
} }
*outDistance = distanceF2; *outDistance = distanceF2;
*outColor = hash_float3_to_float3(cellPosition + offsetF2); *outColor = hash_float3_to_float3(cellPosition + offsetF2);
*outPosition = positionF2 + cellPosition; *outPosition = positionF2 + cellPosition;
} }
ccl_device void voronoi_distance_to_edge_3d(float3 coord, float randomness, float *outDistance) ccl_device void voronoi_distance_to_edge_3d(float3 coord,
float randomness,
ccl_private float *outDistance)
{ {
float3 cellPosition = floor(coord); float3 cellPosition = floor(coord);
float3 localPosition = coord - cellPosition; float3 localPosition = coord - cellPosition;
float3 vectorToClosest = make_float3(0.0f, 0.0f, 0.0f); float3 vectorToClosest = make_float3(0.0f, 0.0f, 0.0f);
float minDistance = 8.0f; float minDistance = 8.0f;
for (int k = -1; k <= 1; k++) { for (int k = -1; k <= 1; k++) {
for (int j = -1; j <= 1; j++) { for (int j = -1; j <= 1; j++) {
Show All 26 Lines for (int j = -1; j <= 1; j++) {
minDistance = min(minDistance, distanceToEdge); minDistance = min(minDistance, distanceToEdge);
} }
} }
} }
} }
*outDistance = minDistance; *outDistance = minDistance;
} }
ccl_device void voronoi_n_sphere_radius_3d(float3 coord, float randomness, float *outRadius) ccl_device void voronoi_n_sphere_radius_3d(float3 coord,
float randomness,
ccl_private float *outRadius)
{ {
float3 cellPosition = floor(coord); float3 cellPosition = floor(coord);
float3 localPosition = coord - cellPosition; float3 localPosition = coord - cellPosition;
float3 closestPoint = make_float3(0.0f, 0.0f, 0.0f); float3 closestPoint = make_float3(0.0f, 0.0f, 0.0f);
float3 closestPointOffset = make_float3(0.0f, 0.0f, 0.0f); float3 closestPointOffset = make_float3(0.0f, 0.0f, 0.0f);
float minDistance = 8.0f; float minDistance = 8.0f;
for (int k = -1; k <= 1; k++) { for (int k = -1; k <= 1; k++) {
▲ Show 20 Lines • Show All 59 Lines • ▼ Show 20 Lines else {
return 0.0f; return 0.0f;
} }
} }
ccl_device void voronoi_f1_4d(float4 coord, ccl_device void voronoi_f1_4d(float4 coord,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float4 *outPosition) ccl_private float4 *outPosition)
{ {
float4 cellPosition = floor(coord); float4 cellPosition = floor(coord);
float4 localPosition = coord - cellPosition; float4 localPosition = coord - cellPosition;
float minDistance = 8.0f; float minDistance = 8.0f;
float4 targetOffset = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 targetOffset = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
float4 targetPosition = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 targetPosition = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
for (int u = -1; u <= 1; u++) { for (int u = -1; u <= 1; u++) {
Show All 20 Linesccl_device void voronoi_f1_4d(float4 coord,
*outPosition = targetPosition + cellPosition; *outPosition = targetPosition + cellPosition;
} }
ccl_device void voronoi_smooth_f1_4d(float4 coord, ccl_device void voronoi_smooth_f1_4d(float4 coord,
float smoothness, float smoothness,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float4 *outPosition) ccl_private float4 *outPosition)
{ {
float4 cellPosition = floor(coord); float4 cellPosition = floor(coord);
float4 localPosition = coord - cellPosition; float4 localPosition = coord - cellPosition;
float smoothDistance = 8.0f; float smoothDistance = 8.0f;
float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f); float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
float4 smoothPosition = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 smoothPosition = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
for (int u = -2; u <= 2; u++) { for (int u = -2; u <= 2; u++) {
Show All 22 Linesccl_device void voronoi_smooth_f1_4d(float4 coord,
*outColor = smoothColor; *outColor = smoothColor;
*outPosition = cellPosition + smoothPosition; *outPosition = cellPosition + smoothPosition;
} }
ccl_device void voronoi_f2_4d(float4 coord, ccl_device void voronoi_f2_4d(float4 coord,
float exponent, float exponent,
float randomness, float randomness,
NodeVoronoiDistanceMetric metric, NodeVoronoiDistanceMetric metric,
float *outDistance, ccl_private float *outDistance,
float3 *outColor, ccl_private float3 *outColor,
float4 *outPosition) ccl_private float4 *outPosition)
{ {
float4 cellPosition = floor(coord); float4 cellPosition = floor(coord);
float4 localPosition = coord - cellPosition; float4 localPosition = coord - cellPosition;
float distanceF1 = 8.0f; float distanceF1 = 8.0f;
float distanceF2 = 8.0f; float distanceF2 = 8.0f;
float4 offsetF1 = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 offsetF1 = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
float4 positionF1 = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 positionF1 = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
Show All 26 Lines for (int k = -1; k <= 1; k++) {
} }
} }
} }
*outDistance = distanceF2; *outDistance = distanceF2;
*outColor = hash_float4_to_float3(cellPosition + offsetF2); *outColor = hash_float4_to_float3(cellPosition + offsetF2);
*outPosition = positionF2 + cellPosition; *outPosition = positionF2 + cellPosition;
} }
ccl_device void voronoi_distance_to_edge_4d(float4 coord, float randomness, float *outDistance) ccl_device void voronoi_distance_to_edge_4d(float4 coord,
float randomness,
ccl_private float *outDistance)
{ {
float4 cellPosition = floor(coord); float4 cellPosition = floor(coord);
float4 localPosition = coord - cellPosition; float4 localPosition = coord - cellPosition;
float4 vectorToClosest = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 vectorToClosest = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
float minDistance = 8.0f; float minDistance = 8.0f;
for (int u = -1; u <= 1; u++) { for (int u = -1; u <= 1; u++) {
for (int k = -1; k <= 1; k++) { for (int k = -1; k <= 1; k++) {
Show All 32 Lines for (int k = -1; k <= 1; k++) {
} }
} }
} }
} }
} }
*outDistance = minDistance; *outDistance = minDistance;
} }
ccl_device void voronoi_n_sphere_radius_4d(float4 coord, float randomness, float *outRadius) ccl_device void voronoi_n_sphere_radius_4d(float4 coord,
float randomness,
ccl_private float *outRadius)
{ {
float4 cellPosition = floor(coord); float4 cellPosition = floor(coord);
float4 localPosition = coord - cellPosition; float4 localPosition = coord - cellPosition;
float4 closestPoint = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 closestPoint = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
float4 closestPointOffset = make_float4(0.0f, 0.0f, 0.0f, 0.0f); float4 closestPointOffset = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
float minDistance = 8.0f; float minDistance = 8.0f;
for (int u = -1; u <= 1; u++) { for (int u = -1; u <= 1; u++) {
Show All 36 Lines for (int k = -1; k <= 1; k++) {
} }
} }
} }
} }
*outRadius = distance(closestPointToClosestPoint, closestPoint) / 2.0f; *outRadius = distance(closestPointToClosestPoint, closestPoint) / 2.0f;
} }
template<uint node_feature_mask> template<uint node_feature_mask>
ccl_device_noinline int svm_node_tex_voronoi(const KernelGlobals *kg, ccl_device_noinline int svm_node_tex_voronoi(ccl_global const KernelGlobals *kg,
ShaderData *sd, ccl_private ShaderData *sd,
float *stack, ccl_private float *stack,
uint dimensions, uint dimensions,
uint feature, uint feature,
uint metric, uint metric,
int offset) int offset)
{ {
uint4 stack_offsets = read_node(kg, &offset); uint4 stack_offsets = read_node(kg, &offset);
uint4 defaults = read_node(kg, &offset); uint4 defaults = read_node(kg, &offset);
▲ Show 20 Lines • Show All 229 Lines • Show Last 20 Lines