static void composite_line_yuv_float( uint8_t *dest, uint8_t *src, int width, uint8_t *alpha_b, uint8_t *alpha_a, float weight )
{
register int j = 0;
float mix_a, mix_b;
for ( ; j < width; j ++ )
{
mix_a = calculate_mix( 1.0f - weight, alpha_a? *alpha_a : 255 );
mix_b = calculate_mix( weight, alpha_b? *alpha_b : 255 );
if (alpha_a) {
float mix2 = mix_b + mix_a - mix_b * mix_a;
*alpha_a = 255 * mix2;
if (mix2 != 0.f) mix_b /= mix2;
}
*dest = sample_mix( *dest, *src++, mix_b );
dest++;
*dest = sample_mix( *dest, *src++, mix_b );
dest++;
if ( alpha_a ) alpha_a ++;
if ( alpha_b ) alpha_b ++;
}
}
void mixaudio(void * userData, Uint8 * stream, int len)
{
int i = 0,j;
Uint32 nbSamples = len / sizeof(Sint16);
for(;i<nbCurrentAudio;i++){
Audio* a = currentAudios[i];
if(a->play){
if(a->fadeOut)
{
a->currentVolume -= a->fadeOut;
if(a->currentVolume<=0){
a->currentVolume = 0;
a->fadeOut = 0;
a->play = 0;
int j=i;
nbCurrentAudio--;
for(;j<nbCurrentAudio;j++){
currentAudios[j] = currentAudios[j+1];
}
a = currentAudios[i];
}
}
else if(a->fadeIn)
{
a->currentVolume += a->fadeIn;
if(a->currentVolume>=a->maxVolume){
a->currentVolume = a->maxVolume;
a->fadeIn = 0;
}
}
for (j = 0; j < nbSamples; j++) {
Sint16 mix = ((Sint16 *)stream)[j];
Sint16 sample = a->soundpos < a->soundlength ?
(*((Sint16 *)(a->sounddata + a->soundpos))) :
0;
sample = sample_volume(sample,a->currentVolume);
sample = sample_mix(sample, mix);
((Sint16 *)stream)[j] = sample;
a->soundpos += sizeof(Sint16);
}
if(a->soundpos>a->soundlength){
if(!a->repeat){
a->play = 0;
}
a->soundpos = 0;
}
}
}
}
