Add audio api. Fix vdp_define_colour. Add vdp_plot general command. (#15

)

Fix vdp_define_colour. Add vdp_plot. Add audio commands.

src/libc/include/vdp_vdu.h

@@ -32,7 +32,7 @@ void vdp_cursor_tab( int row, int col );
 void vdp_set_text_colour( int colour );
 void vdp_set_graphics_colour( int mode, int colour );
 #define vdp_gcol( M, C ) vdp_set_graphics_colour( M, C )
-void vdp_define_colour (int logical, int red, int green, int blue );
+void vdp_define_colour(int logical, int physical, int red, int green, int blue );
 void vdp_graphics_origin( int x, int y );
 int vdp_mode( int mode );
 void vdp_swap( void );
@@ -47,6 +47,7 @@ void vdp_reset_viewports( void );
 void vdp_set_graphics_viewport( int left, int bottom, int right, int top );
 void vdp_set_text_viewport( int left, int bottom, int right, int top );
 
+void vdp_plot( int plot_mode, int x, int y );
 void vdp_move_to( int x, int y );
 void vdp_line_to( int x, int y );
 void vdp_point( int x, int y );
@@ -92,9 +93,47 @@ int vdp_adv_load_sprite_bitmaps( const char *fname_prefix, const char *fname_for
 void vdp_adv_add_sprite_bitmap( int b );
 void vdp_adv_create_sprite( int sprite, int bitmap_num, int frames );
 
+void vdp_audio_play_note( int channel, int volume, int frequency, int duration);
+void vdp_audio_status( int channel );
+void vdp_audio_set_volume( int channel, int volume );
+void vdp_audio_set_frequency( int channel, int frequency );
+#define VDP_AUDIO_WAVEFORM_SQUARE 0
+#define VDP_AUDIO_WAVEFORM_TRIANGLE 1
+#define VDP_AUDIO_WAVEFORM_SAWTOOTH 2
+#define VDP_AUDIO_WAVEFORM_SINEWAVE 3
+#define VDP_AUDIO_WAVEFORM_NOISE 4
+#define VDP_AUDIO_WAVEFORM_VICNOISE 5
+void vdp_audio_set_waveform( int channel, int waveform );
+void vdp_audio_set_sample( int channel, int bufferID );
+void vdp_audio_load_sample( int sample, int length, uint8_t *data);
+void vdp_audio_clear_sample( int sample );
+#define VDP_AUDIO_SAMPLE_FORMAT_8BIT_SIGNED 0
+#define VDP_AUDIO_SAMPLE_FORMAT_8BIT_UNSIGNED 1
+#define VDP_AUDIO_SAMPLE_FORMAT_SAMPLE_RATE_FOLLOWS 8
+#define VDP_AUDIO_SAMPLE_FORMAT_SAMPLE_TUNEABLE 8
+void vdp_audio_create_sample_from_buffer( int channel, int bufferID, int format);
+void vdp_audio_set_sample_frequency( int sample, int frequency );
+void vdp_audio_set_buffer_frequency( int channel, int bufferID, int frequency );
+void vdp_audio_set_sample_repeat_start( int sample, int repeatStart );
+void vdp_audio_set_buffer_repeat_start( int channel, int bufferID, int repeatStart );
+void vdp_audio_set_sample_repeat_length( int sample, int repeatLength );
+void vdp_audio_set_buffer_repeat_length( int channel, int bufferID, int repeatLength );
+
+void vdp_audio_volume_envelope_disable( int channel );
+void vdp_audio_volume_envelope_ADSR( int channel, int attack, int decay, int sustain, int release );
+void vdp_audio_volume_envelope_multiphase_ADSR( int channel ); // variable length parameters to be send separately
+void vdp_audio_frequency_envelope_disable( int channel );
+#define VDP_AUDIO_FREQ_ENVELOPE_CONTROL_REPEATS 1
+#define VDP_AUDIO_FREQ_ENVELOPE_CONTROL_CUMULATIVE 2
+#define VDP_AUDIO_FREQ_ENVELOPE_CONTROL_RESTRICT 4
+void vdp_audio_frequency_envelope_stepped( int channel, int phaseCount, int controlByte, int stepLength );
+
+void vdp_audio_enable_channel( int channel );
+void vdp_audio_disable_channel( int channel );
+void vdp_audio_reset_channel( int channel );
+
 #ifdef __cplusplus
 }
 #endif
 
 #endif
-