Function getFrameJitter

src/dll/taa.cpp:247–262

}

static glm::vec2 getFrameJitter()
{
    ZoneScopedN(__FUNCTION__);

    if (g_frameConstants.taaRanThisFrame)
    {
        // We're post TAA in the frame. Must not add jitter or stuff will shake.
        return glm::vec2(0, 0);
    }

    glm::vec2 sampleOffset = hammersley2d((g_frameConstants.taaSampleIdx * 7u) % 16u, 16, 238308531);
    sampleOffset -= 0.5f;
    sampleOffset.x *= 2.0f / g_frameConstants.screenWidth;
    sampleOffset.y *= 2.0f / g_frameConstants.screenHeight;
    return sampleOffset;
}

// Cache of jittered projection matrices calculated for the shared pixel and vertex constant buffers.
// The math to calculate them is quite expensive, so we cache them and only update when needed.