Method evaluateFormat

src/SFML/Window/GlContext.cpp:801–834

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int GlContext::evaluateFormat(
    unsigned int           bitsPerPixel,
    const ContextSettings& settings,
    int                    colorBits,
    int                    depthBits,
    int                    stencilBits,
    int                    antiAliasing,
    bool                   accelerated,
    bool                   sRgb)
{
    int colorDiff        = static_cast<int>(bitsPerPixel) - colorBits;
    int depthDiff        = static_cast<int>(settings.depthBits) - depthBits;
    int stencilDiff      = static_cast<int>(settings.stencilBits) - stencilBits;
    int antiAliasingDiff = static_cast<int>(settings.antiAliasingLevel) - antiAliasing;

    // Weight sub-scores so that better settings don't score equally as bad as worse settings
    colorDiff *= ((colorDiff > 0) ? 100'000 : 1);
    depthDiff *= ((depthDiff > 0) ? 100'000 : 1);
    stencilDiff *= ((stencilDiff > 0) ? 100'000 : 1);
    antiAliasingDiff *= ((antiAliasingDiff > 0) ? 100'000 : 1);

    // Aggregate the scores
    int score = std::abs(colorDiff) + std::abs(depthDiff) + std::abs(stencilDiff) + std::abs(antiAliasingDiff);

    // If the user wants an sRGB capable format, try really hard to get one
    if (settings.sRgbCapable && !sRgb)
        score += 10'000'000;

    // Make sure we prefer hardware acceleration over features
    if (!accelerated)
        score += 100'000'000;

    return score;
}


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