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#pragma version(1)
#pragma rs java_package_name(com.android.balls)
#include "balls.rsh"
float2 gGravityVector = {0.f, 9.8f};
float2 gMinPos = {0.f, 0.f};
float2 gMaxPos = {1280.f, 700.f};
float touchX;
float touchY;
float touchPressure = 0.f;
void setGamma(float g) {
}
void root(const Ball_t *ballIn, Ball_t *ballOut, const BallControl_t *ctl, uint32_t x) {
float2 fv = {0, 0};
float2 pos = ballIn->position;
//rsDebug("physics pos in", pos);
int arcID = -1;
float arcInvStr = 100000;
const Ball_t * bPtr = rsGetElementAt(ctl->ain, 0);
for (uint32_t xin = 0; xin < ctl->dimX; xin++) {
float2 vec = bPtr[xin].position - pos;
float2 vec2 = vec * vec;
float len2 = vec2.x + vec2.y;
if (len2 < 1000) {
if (len2 > (4*4)) {
// Repulsion
float len = sqrt(len2);
if (len < arcInvStr) {
arcInvStr = len;
arcID = xin;
}
fv -= (vec / (len * len * len)) * 20000.f;
} else {
if (len2 < 0.1) {
continue;
}
// Collision
float2 axis = normalize(vec);
float e1 = dot(axis, ballIn->delta);
float e2 = dot(axis, bPtr[xin].delta);
float e = (e1 - e2) * 0.45f;
if (e1 > 0) {
fv -= axis * e;
} else {
fv += axis * e;
}
}
}
}
fv -= gGravityVector;
fv *= ctl->dt;
{
float2 tp = {touchX, touchY};
float2 vec = tp - ballIn->position;
float2 vec2 = vec * vec;
float len2 = vec2.x + vec2.y;
if (len2 > 0.2) {
float len = sqrt(len2);
fv -= (vec / (len * len)) * touchPressure * 1000.f;
}
}
ballOut->delta = ballIn->delta * 0.998f;
ballOut->position = ballIn->position;
ballOut->delta += fv;
ballOut->position += ballOut->delta * ctl->dt;
if (ballOut->position.x > gMaxPos.x) {
if (ballOut->delta.x > 0) {
ballOut->delta.x *= -0.7;
}
ballOut->position.x = gMaxPos.x;
}
if (ballOut->position.y > gMaxPos.y) {
if (ballOut->delta.y > 0) {
ballOut->delta.y *= -0.7;
}
ballOut->position.y = gMaxPos.y - 1.f;
}
if (ballOut->position.x < gMinPos.x) {
if (ballOut->delta.x < 0) {
ballOut->delta.x *= -0.7;
}
ballOut->position.x = gMinPos.x + 1.f;
}
if (ballOut->position.y < gMinPos.y) {
if (ballOut->delta.y < 0) {
ballOut->delta.y *= -0.7;
}
ballOut->position.y = gMinPos.y + 1.f;
}
ballOut->color.b = 1.f;
ballOut->color.r = min(sqrt(length(ballOut->delta)) * 0.1f, 1.f);
ballOut->color.g = min(sqrt(length(fv) * 0.1f), 1.f);
ballOut->arcID = arcID;
ballOut->arcStr = 8 / arcInvStr;
//rsDebug("physics pos out", ballOut->position);
}
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