Fix buffer overrun in WaveformMath

32 excess samples were read from the preset state in waveform modes. Didn't have any noticeable impact, but we should clearly not read over the end of an array.

src/libprojectM/MilkdropPreset/Waveforms/WaveformMath.cpp

@@ -13,29 +13,30 @@ namespace Waveforms {
 auto WaveformMath::GetVertices(const PresetState& presetState,
                                const PerFrameContext& presetPerFrameContext) -> std::array<VertexList, 2>
 {
-    static_assert(libprojectM::Audio::WaveformSamples <= WaveformMaxPoints, "WaveformMaxPoints is larger than WaveformSamples");
+    static_assert(WaveformMaxPoints >= libprojectM::Audio::SpectrumSamples, "WaveformMaxPoints is smaller than SpectrumSamples");
+    static_assert(WaveformMaxPoints >= libprojectM::Audio::WaveformSamples, "WaveformMaxPoints is smaller than WaveformSamples");
 
     using libprojectM::Audio::WaveformSamples;
 
     // Get the correct audio sample type for the current waveform mode.
     if (IsSpectrumWave())
     {
         std::copy(begin(presetState.audioData.spectrumLeft),
-                  begin(presetState.audioData.spectrumLeft) + WaveformMaxPoints,
+                  begin(presetState.audioData.spectrumLeft) + Audio::SpectrumSamples,
                   begin(m_pcmDataL));
 
         std::copy(begin(presetState.audioData.spectrumRight),
-                  begin(presetState.audioData.spectrumRight) + WaveformMaxPoints,
+                  begin(presetState.audioData.spectrumRight) + Audio::SpectrumSamples,
                   begin(m_pcmDataR));
     }
     else
     {
         std::copy(begin(presetState.audioData.waveformLeft),
-                  begin(presetState.audioData.waveformLeft) + WaveformMaxPoints,
+                  begin(presetState.audioData.waveformLeft) + Audio::WaveformSamples,
                   begin(m_pcmDataL));
 
         std::copy(begin(presetState.audioData.waveformRight),
-                  begin(presetState.audioData.waveformRight) + WaveformMaxPoints,
+                  begin(presetState.audioData.waveformRight) + Audio::WaveformSamples,
                   begin(m_pcmDataR));
     }