Add EAX extensions (EAX 2.0-5.0, X-RAM) (#632)

* Add EAX extensions (EAX 2.0-5.0, X-RAM)

* Comment out C++17 leftovers

* Remove everything related to patching

* Update alsoftrc.sample

* Rewrite integration

* Fix GCC compilation under Linux

* Always reset EAX effect properties when loading it into FX slot

1 files changed, 40 insertions, 0 deletions

diff --git a/al/filter.h b/al/filter.h
index 123e64b0..222a6917 100644
--- a/al/filter.h
+++ b/al/filter.h
@@ -1,12 +1,18 @@
 #ifndef AL_FILTER_H
 #define AL_FILTER_H
 
+
 #include "AL/al.h"
 #include "AL/alc.h"
 #include "AL/alext.h"
 
 #include "almalloc.h"
 
+#if ALSOFT_EAX
+#include <memory>
+
+#include "eax_utils.h"
+#endif // ALSOFT_EAX
 
 #define LOWPASSFREQREF  5000.0f
 #define HIGHPASSFREQREF  250.0f
@@ -47,6 +53,40 @@ struct ALfilter {
     void getParamfv(ALenum param, float *values) const { vtab->getParamfv(this, param, values); }
 
     DISABLE_ALLOC()
+
+#if ALSOFT_EAX
+public:
+    void eax_set_low_pass_params(
+        ALCcontext& context,
+        const EaxAlLowPassParam& param);
+#endif // ALSOFT_EAX
 };
 
+#if ALSOFT_EAX
+class EaxAlFilterDeleter
+{
+public:
+    EaxAlFilterDeleter() noexcept = default;
+
+    EaxAlFilterDeleter(
+        ALCcontext& context);
+
+
+    void operator()(
+        ALfilter* filter);
+
+private:
+    ALCcontext* context_{};
+}; // EaxAlFilterDeleter
+
+using EaxAlFilterUPtr = std::unique_ptr<ALfilter, EaxAlFilterDeleter>;
+
+EaxAlFilterUPtr eax_create_al_low_pass_filter(
+    ALCcontext& context);
+
+void eax_delete_low_pass_filter(
+    ALCcontext& context,
+    ALfilter& filter);
+#endif // ALSOFT_EAX
+
 #endif