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IsochronicPictureSynthesis.cpp
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IsochronicPictureSynthesis.cpp
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#include "IsochronicPictureSynthesis.h"
#include <dinrhiw.h>
IsochronicPictureSynthesis::IsochronicPictureSynthesis()
{
beforePhase = 0.0f;
beforeTick = 0;
logF = 0.0;
r = 1.0;
g = 1.0;
b = 1.0;
}
IsochronicPictureSynthesis::~IsochronicPictureSynthesis()
{
}
std::string IsochronicPictureSynthesis::getSynthesizerName()
{
return "SDL-IsochronicPictureSynthesis";
}
bool IsochronicPictureSynthesis::reset()
{
beforePhase = 0.0f;
beforeTick = 0;
r = 1.0;
g = 1.0;
b = 1.0;
logF = 0.0;
return true;
}
// parameters are: frequency [1/s = Hz], (r, g, b) [r g b components are values 0-1]
bool IsochronicPictureSynthesis::getParameters(std::vector<float>& p)
{
p.resize(4);
p[0] = (logF+1.0)/5.0;
p[1] = r;
p[2] = g;
p[3] = b;
return true;
}
bool IsochronicPictureSynthesis::setParameters(const std::vector<float>& p)
{
if(p.size() == 4){
if(p[0] < 0.0f){
logF = 0.0;
}
else if(p[0] > 1.0f){
logF = 1.0;
}
else{
logF = p[0];
}
logF *= 5.0;
logF -= 1.0;
if(p[1] < 0.0f){
r = 0.0;
}
else if(p[1] > 1.0f){
r = 1.0;
}
else{
r = p[1];
}
if(p[2] < 0.0f){
g = 0.0;
}
else if(p[2] > 1.0f){
g = 1.0;
}
else{
g = p[2];
}
if(p[3] < 0.0f){
b = 0.0;
}
else if(p[3] > 1.0f){
b = 1.0;
}
else{
b = p[3];
}
return true;
}
else return false;
}
unsigned int IsochronicPictureSynthesis::getNumberOfParameters()
{
return 4;
}
bool IsochronicPictureSynthesis::synthesize(unsigned long long tickTimeMS, SDL_Surface* picture)
{
if(picture == NULL) return false;
if(beforeTick == 0){
const double t = tickTimeMS/1000.0;
const double F = whiteice::math::exp((double)logF);
double A = whiteice::math::sin(F*t);
if(A < 0.0) A = 0.0;
A = whiteice::math::sqrt(A);
A = whiteice::math::sqrt(A);
A = whiteice::math::sqrt(A);
A = whiteice::math::sqrt(A); // x^0.0625 => close to rectangular wave function
const unsigned int R = A*r*255.0;
const unsigned int G = A*g*255.0;
const unsigned int B = A*b*255.0;
SDL_FillRect(picture, NULL, SDL_MapRGB(picture->format, R, G, B));
beforeTick = tickTimeMS;
beforePhase = F*t;
}
else{
const double t = (tickTimeMS-beforeTick)/1000.0;
const double F = whiteice::math::exp((double)logF);
double A = whiteice::math::sin(beforePhase + F*t);
if(A < 0.0) A = 0.0;
A = whiteice::math::sqrt(A);
A = whiteice::math::sqrt(A);
A = whiteice::math::sqrt(A);
A = whiteice::math::sqrt(A); // x^0.0625 => close to rectangular wave function
const unsigned int R = A*r*255.0;
const unsigned int G = A*g*255.0;
const unsigned int B = A*b*255.0;
SDL_FillRect(picture, NULL, SDL_MapRGB(picture->format, R, G, B));
beforeTick = tickTimeMS;
beforePhase = beforePhase + F*t;
}
return true;
}