C++ (Cpp) SDL_pow Examples

Example #1

File: SDL_gamma.c Project: Alexander--/Wesnoth-1.8-for-Android

static void
CalculateGammaRamp(float gamma, Uint16 * ramp)
{
    int i;

    /* 0.0 gamma is all black */
    if (gamma <= 0.0f) {
        for (i = 0; i < 256; ++i) {
            ramp[i] = 0;
        }
        return;
    } else
        /* 1.0 gamma is identity */
    if (gamma == 1.0f) {
        for (i = 0; i < 256; ++i) {
            ramp[i] = (i << 8) | i;
        }
        return;
    } else
        /* Calculate a real gamma ramp */
    {
        int value;
        gamma = 1.0f / gamma;
        for (i = 0; i < 256; ++i) {
            value =
                (int) (SDL_pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
            if (value > 65535) {
                value = 65535;
            }
            ramp[i] = (Uint16) value;
        }
    }
}

Example #2

File: edid-parse.c Project: 1vanK/Urho3D

static double
decode_fraction (int high, int low)
{
    double result = 0.0;
    int i;

    high = (high << 2) | low;

    for (i = 0; i < 10; ++i)
	result += get_bit (high, i) * SDL_pow (2, i - 10);

    return result;
}