compute_mean_brightness()

float MayaFlux::Yantra::VisionAnalyzer::compute_mean_brightness ( const std::array< uint32_t, 256 > &  histogram )

private

Dispatch histogram_reduce.comp over an already-computed histogram.

Definition at line 369 of file VisionAnalyzer.cpp.

{
    if (!m_brightness_reducer) {
        m_brightness_reducer = std::make_shared<ShaderExecutionContext<>>(
            GpuComputeConfig {
                .shader_path = "histogram_reduce.comp.spv",
                .workgroup_size = { 256, 1, 1 },
                .push_constant_size = 0 });
    }
 
    const std::vector<uint32_t> hist_vec(histogram.begin(), histogram.end());
    m_brightness_reducer->input(0, hist_vec, GpuBufferBinding::ElementType::UINT32)
        .output(1, sizeof(float));
 
    const auto output = m_brightness_reducer->execute(Datum<std::vector<Kakshya::DataVariant>> {}, ExecutionContext {});
    const auto raw = ShaderExecutionContext<>::read_output<float>(output, 1);
    return raw.empty() ? 0.0F : raw[0];
}

References m_brightness_reducer, MayaFlux::Portal::Graphics::GpuComputeConfig::shader_path, and MayaFlux::Portal::Graphics::GpuBufferBinding::UINT32.

Referenced by measure_appearance().

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