1 files changed, 164 insertions, 0 deletions
diff --git a/alc/effects/null.cpp b/alc/effects/null.cpp
new file mode 100644
index 00000000..e55c8699
--- /dev/null
+++ b/alc/effects/null.cpp
@@ -0,0 +1,164 @@
+#include "config.h"
+
+#include <cstdlib>
+
+#include "AL/al.h"
+#include "AL/alc.h"
+
+#include "alcmain.h"
+#include "alcontext.h"
+#include "alAuxEffectSlot.h"
+#include "alError.h"
+
+
+namespace {
+
+struct NullState final : public EffectState {
+    NullState();
+    ~NullState() override;
+
+    ALboolean deviceUpdate(const ALCdevice *device) override;
+    void update(const ALCcontext *context, const ALeffectslot *slot, const EffectProps *props, const EffectTarget target) override;
+    void process(const ALsizei samplesToDo, const FloatBufferLine *RESTRICT samplesIn, const ALsizei numInput, const al::span<FloatBufferLine> samplesOut) override;
+
+    DEF_NEWDEL(NullState)
+};
+
+/* This constructs the effect state. It's called when the object is first
+ * created.
+ */
+NullState::NullState() = default;
+
+/* This destructs the effect state. It's called only when the effect instance
+ * is no longer used.
+ */
+NullState::~NullState() = default;
+
+/* This updates the device-dependant effect state. This is called on state
+ * initialization and any time the device parameters (e.g. playback frequency,
+ * format) have been changed. Will always be followed by a call to the update
+ * method, if successful.
+ */
+ALboolean NullState::deviceUpdate(const ALCdevice* /*device*/)
+{
+    return AL_TRUE;
+}
+
+/* This updates the effect state with new properties. This is called any time
+ * the effect is (re)loaded into a slot.
+ */
+void NullState::update(const ALCcontext* /*context*/, const ALeffectslot* /*slot*/,
+    const EffectProps* /*props*/, const EffectTarget /*target*/)
+{
+}
+
+/* This processes the effect state, for the given number of samples from the
+ * input to the output buffer. The result should be added to the output buffer,
+ * not replace it.
+ */
+void NullState::process(const ALsizei /*samplesToDo*/,
+    const FloatBufferLine *RESTRICT /*samplesIn*/, const ALsizei /*numInput*/,
+    const al::span<FloatBufferLine> /*samplesOut*/)
+{
+}
+
+
+void NullEffect_setParami(EffectProps* /*props*/, ALCcontext *context, ALenum param, ALint /*val*/)
+{
+    switch(param)
+    {
+    default:
+        alSetError(context, AL_INVALID_ENUM, "Invalid null effect integer property 0x%04x", param);
+    }
+}
+void NullEffect_setParamiv(EffectProps *props, ALCcontext *context, ALenum param, const ALint *vals)
+{
+    switch(param)
+    {
+    default:
+        NullEffect_setParami(props, context, param, vals[0]);
+    }
+}
+void NullEffect_setParamf(EffectProps* /*props*/, ALCcontext *context, ALenum param, ALfloat /*val*/)
+{
+    switch(param)
+    {
+    default:
+        alSetError(context, AL_INVALID_ENUM, "Invalid null effect float property 0x%04x", param);
+    }
+}
+void NullEffect_setParamfv(EffectProps *props, ALCcontext *context, ALenum param, const ALfloat *vals)
+{
+    switch(param)
+    {
+    default:
+        NullEffect_setParamf(props, context, param, vals[0]);
+    }
+}
+
+void NullEffect_getParami(const EffectProps* /*props*/, ALCcontext *context, ALenum param, ALint* /*val*/)
+{
+    switch(param)
+    {
+    default:
+        alSetError(context, AL_INVALID_ENUM, "Invalid null effect integer property 0x%04x", param);
+    }
+}
+void NullEffect_getParamiv(const EffectProps *props, ALCcontext *context, ALenum param, ALint *vals)
+{
+    switch(param)
+    {
+    default:
+        NullEffect_getParami(props, context, param, vals);
+    }
+}
+void NullEffect_getParamf(const EffectProps* /*props*/, ALCcontext *context, ALenum param, ALfloat* /*val*/)
+{
+    switch(param)
+    {
+    default:
+        alSetError(context, AL_INVALID_ENUM, "Invalid null effect float property 0x%04x", param);
+    }
+}
+void NullEffect_getParamfv(const EffectProps *props, ALCcontext *context, ALenum param, ALfloat *vals)
+{
+    switch(param)
+    {
+    default:
+        NullEffect_getParamf(props, context, param, vals);
+    }
+}
+
+DEFINE_ALEFFECT_VTABLE(NullEffect);
+
+
+struct NullStateFactory final : public EffectStateFactory {
+    EffectState *create() override;
+    EffectProps getDefaultProps() const noexcept override;
+    const EffectVtable *getEffectVtable() const noexcept override;
+};
+
+/* Creates EffectState objects of the appropriate type. */
+EffectState *NullStateFactory::create()
+{ return new NullState{}; }
+
+/* Returns an ALeffectProps initialized with this effect type's default
+ * property values.
+ */
+EffectProps NullStateFactory::getDefaultProps() const noexcept
+{
+    EffectProps props{};
+    return props;
+}
+
+/* Returns a pointer to this effect type's global set/get vtable. */
+const EffectVtable *NullStateFactory::getEffectVtable() const noexcept
+{ return &NullEffect_vtable; }
+
+} // namespace
+
+EffectStateFactory *NullStateFactory_getFactory()
+{
+    static NullStateFactory NullFactory{};
+    return &NullFactory;
+}