public static void stbi__hdr_convert(float *output, byte *input, int req_comp)
{
if (input[3] != 0)
{
float f1 = 0;
f1 = (float)CRuntime.ldexp((double)1.0f, input[3] - (128 + 8));
if (req_comp <= 2)
{
output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
}
else
{
output[0] = input[0] * f1;
output[1] = input[1] * f1;
output[2] = input[2] * f1;
}
if (req_comp == 2)
{
output[1] = 1;
}
if (req_comp == 4)
{
output[3] = 1;
}
}
else
{
switch (req_comp)
{
case 4:
case 3:
output[3] = 1;
if (req_comp == 3)
{
output[0] = output[1] = output[2] = 0;
}
break;
case 2:
case 1:
output[1] = 1;
if (req_comp == 1)
{
output[0] = 0;
}
break;
}
}
}