| // Copyright (C) 2011 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #pragma version(1) |
| #pragma rs java_package_name(com.example.android.rs.computeperf) |
| |
| const int gMaxIteration = 500; |
| const int gDimX = 1024; |
| const int gDimY = 1024; |
| |
| void root(uchar4 *v_out, uint32_t x, uint32_t y) { |
| float2 p; |
| p.x = -2.5f + ((float)x / gDimX) * 3.5f; |
| p.y = -1.f + ((float)y / gDimY) * 2.f; |
| |
| float2 t = 0; |
| float2 t2 = t * t; |
| int iteration = 0; |
| while((t2.x + t2.y < 4.f) && (iteration < gMaxIteration)) { |
| float xtemp = t2.x - t2.y + p.x; |
| t.y = 2 * t.x * t.y + p.y; |
| t.x = xtemp; |
| iteration++; |
| t2 = t * t; |
| } |
| |
| if(iteration >= gMaxIteration) { |
| *v_out = 0; |
| } else { |
| *v_out = (uchar4){iteration & 0xff, (iteration >> 6) & 0xff, 0x8f, 0xff}; |
| } |
| } |