1 // Fountain test script 2 #pragma version(1) 3 4 #pragma rs java_package_name(com.example.android.rs.fountain) 5 6 #pragma stateFragment(parent) 7 8 #include "rs_graphics.rsh" 9 10 static int newPart = 0; 11 rs_mesh partMesh; 12 13 typedef struct __attribute__((packed, aligned(4))) Point { 14 float2 delta; 15 float2 position; 16 uchar4 color; 17 } Point_t; 18 Point_t *point; 19 20 int root() { 21 float dt = min(rsGetDt(), 0.1f); 22 rsgClearColor(0.f, 0.f, 0.f, 1.f); 23 const float height = rsgGetHeight(); 24 const int size = rsAllocationGetDimX(rsGetAllocation(point)); 25 float dy2 = dt * (10.f); 26 Point_t * p = point; 27 for (int ct=0; ct < size; ct++) { 28 p->delta.y += dy2; 29 p->position += p->delta; 30 if ((p->position.y > height) && (p->delta.y > 0)) { 31 p->delta.y *= -0.3f; 32 } 33 p++; 34 } 35 36 rsgDrawMesh(partMesh); 37 return 1; 38 } 39 40 static float4 partColor[10]; 41 void addParticles(int rate, float x, float y, int index, bool newColor) 42 { 43 if (newColor) { 44 partColor[index].x = rsRand(0.5f, 1.0f); 45 partColor[index].y = rsRand(1.0f); 46 partColor[index].z = rsRand(1.0f); 47 } 48 float rMax = ((float)rate) * 0.02f; 49 int size = rsAllocationGetDimX(rsGetAllocation(point)); 50 uchar4 c = rsPackColorTo8888(partColor[index]); 51 52 Point_t * np = &point[newPart]; 53 float2 p = {x, y}; 54 while (rate--) { 55 float angle = rsRand(3.14f * 2.f); 56 float len = rsRand(rMax); 57 np->delta.x = len * sin(angle); 58 np->delta.y = len * cos(angle); 59 np->position = p; 60 np->color = c; 61 newPart++; 62 np++; 63 if (newPart >= size) { 64 newPart = 0; 65 np = &point[newPart]; 66 } 67 } 68 } 69 70
