1 files changed, 149 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Effects_Buffer.h b/plugins/gme/game-music-emu-0.6pre/gme/Effects_Buffer.h
new file mode 100644
index 00000000..348c74c7
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+++ b/plugins/gme/game-music-emu-0.6pre/gme/Effects_Buffer.h
@@ -0,0 +1,149 @@
+// Multi-channel effects buffer with echo and individual panning for each channel
+
+// Game_Music_Emu 0.6-pre
+#ifndef EFFECTS_BUFFER_H
+#define EFFECTS_BUFFER_H
+
+#include "Multi_Buffer.h"
+
+// See Simple_Effects_Buffer (below) for a simpler interface
+
+class Effects_Buffer : public Multi_Buffer {
+public:
+	// To reduce memory usage, fewer buffers can be used (with a best-fit
+	// approach if there are too few), and maximum echo delay can be reduced
+	Effects_Buffer( int max_bufs = 32, int echo_size = 24 * 1024 );
+	
+	struct pan_vol_t
+	{
+		float vol; // 0.0 = silent, 0.5 = half volume, 1.0 = normal
+		float pan; // -1.0 = left, 0.0 = center, +1.0 = right
+	};
+	
+	// Global configuration
+	struct config_t
+	{
+		bool enabled; // false = disable all effects
+		
+		// Current sound is echoed at adjustable left/right delay,
+		// with reduced treble and volume (feedback). 
+		float treble;   // 1.0 = full treble, 0.1 = very little, 0.0 = silent
+		int delay [2];  // left, right delays (msec)
+		float feedback; // 0.0 = no echo, 0.5 = each echo half previous, 1.0 = cacophony
+		pan_vol_t side_chans [2]; // left and right side channel volume and pan
+	};
+	config_t& config() { return config_; }
+	
+	// Limits of delay (msec)
+	int min_delay() const;
+	int max_delay() const;
+	
+	// Per-channel configuration. Two or more channels with matching parameters are
+	// optimized to internally use the same buffer.
+	struct chan_config_t : pan_vol_t
+	{
+		// (inherited from pan_vol_t)
+		//float vol;        // these only affect center channel
+		//float pan;
+		bool surround;  // if true, negates left volume to put sound in back
+		bool echo;      // false = channel doesn't have any echo
+	};
+	chan_config_t& chan_config( int i ) { return chans [i + extra_chans].cfg; }
+	
+	// Applies any changes made to config() and chan_config()
+	virtual void apply_config();
+	
+// Implementation
+public:
+	~Effects_Buffer();
+	blargg_err_t set_sample_rate( int samples_per_sec, int msec = blip_default_length );
+	blargg_err_t set_channel_count( int, int const* = NULL );
+	void clock_rate( int );
+	void bass_freq( int );
+	void clear();
+	channel_t channel( int );
+	void end_frame( blip_time_t );
+	int read_samples( blip_sample_t [], int );
+	int samples_avail() const { return (bufs [0].samples_avail() - mixer.samples_read) * 2; }
+	enum { stereo = 2 };
+	typedef int fixed_t;
+
+protected:
+	enum { extra_chans = stereo * stereo };
+
+private:
+	config_t config_;
+	int clock_rate_;
+	int bass_freq_;
+	
+	int echo_size;
+	
+	struct chan_t
+	{
+		fixed_t vol [stereo];
+		chan_config_t cfg;
+		channel_t channel;
+	};
+	blargg_vector<chan_t> chans;
+	
+	struct buf_t : Tracked_Blip_Buffer
+	{
+		// nasty: Blip_Buffer has something called fixed_t
+		Effects_Buffer::fixed_t vol [stereo];
+		bool echo;
+		
+		void* operator new ( size_t, void* p ) { return p; }
+		void operator delete ( void* ) { }
+		
+		~buf_t() { }
+	};
+	buf_t* bufs;
+	int bufs_size;
+	int bufs_max; // bufs_size <= bufs_max, to limit memory usage
+	Stereo_Mixer mixer;
+	
+	struct {
+		int delay [stereo];
+		fixed_t treble;
+		fixed_t feedback;
+		fixed_t low_pass [stereo];
+	} s;
+	
+	blargg_vector<fixed_t> echo;
+	int echo_pos;
+	
+	bool no_effects;
+	bool no_echo;
+	
+	void assign_buffers();
+	void clear_echo();
+	void mix_effects( blip_sample_t out [], int pair_count );
+	blargg_err_t new_bufs( int size );
+	void delete_bufs();
+};
+
+// Simpler interface and lower memory usage
+class Simple_Effects_Buffer : public Effects_Buffer {
+public:
+	struct config_t
+	{
+		bool enabled;   // false = disable all effects
+		
+		float echo;     // 0.0 = none, 1.0 = lots
+		float stereo;   // 0.0 = channels in center, 1.0 = channels on left/right
+		bool surround;  // true = put some channels in back
+	};
+	config_t& config() { return config_; }
+	
+	// Applies any changes made to config()
+	void apply_config();
+	
+// Implementation
+public:
+	Simple_Effects_Buffer();
+private:
+	config_t config_;
+	void chan_config(); // hide
+};
+
+#endif