Moved main routines of beeb tracker into separate module so we can bu…

…ild different volumes

beebtracker.h.6502

@@ -0,0 +1,130 @@
+\ ******************************************************************
+\\ Beeb Tracker 
+\ ******************************************************************
+
+
+
+\ ******************************************************************
+\ *	Define app constants
+\ ******************************************************************
+
+
+\\ VU & beat bar FX
+
+FX_chr_x = 4
+FX_chr_y = 8
+FX_chr_w = 32
+FX_chr_h = 5
+FX_address = MODE7_base_addr + FX_chr_y*40 + FX_chr_x
+FX_address_row0 = FX_address
+FX_address_row1 = FX_address_row0 + 40
+FX_address_row2 = FX_address_row1 + 40
+FX_address_row3 = FX_address_row2 + 40
+FX_address_row4 = FX_address_row3 + 40
+
+\\ Channel beat bar locations - beat bars are 3 chrs high
+FX_address_beat = MODE7_base_addr + 40*14
+FX_ch0_x = 10
+FX_ch1_x = 17
+FX_ch2_x = 24
+FX_ch3_x = 31
+
+\\ Playtime bar locations
+FX_playtime_address = MODE7_base_addr + 40*6 + 8
+FX_playtime_chrs = 24
+FX_playtime_width = (FX_playtime_chrs*2)-1	; SM: rounding hack. 48 really. 8bit precision is fun.
+
+\\ Tracker screen setup
+TRACKER_lineno_field_xpos = 4
+TRACKER_ch3_field_xpos = 12
+TRACKER_ch2_field_xpos = 19
+TRACKER_ch1_field_xpos = 26
+TRACKER_noise_field_xpos = 33
+
+TRACKER_top_line_ypos = 14
+TRACKER_active_line_ypos = 17
+TRACKER_dupe_line_ypos = 18
+TRACKER_bottom_line_ypos = 21
+
+\\ Menu screen setup
+MENU_entry_xpos = 3
+MENU_entry_width = 32									; if this changes from 32 then need to change code!
+MENU_top_line_ypos = 16
+MENU_bottom_line_ypos = 21
+MENU_overlay_ypos = 14
+MENU_overlay_size = 9 * MODE7_char_width				; 9 lines of 40 chars for our menu
+MENU_overlay_dst_addr = MODE7_base_addr + MENU_overlay_ypos * MODE7_char_width
+
+\\ Menu key config
+MENU_key_toggle = IKN_esc
+MENU_key_up = IKN_up
+MENU_key_down = IKN_down
+MENU_key_select = IKN_return
+
+META_title_addr = MODE7_base_addr + 3 * MODE7_char_width + 9			; title displayed at (9, 3)
+META_author_addr = MODE7_base_addr + 4 * MODE7_char_width + 9			; auther dispayed at (9, 4)
+META_max_width = 30														; 30 chars available
+META_scroll_start_delay = 100											; 2 seconds - time before meta data strings scroll
+META_scroll_update_delay = 10											; 0.2 seconds - scroll speed of meta data strings
+
+META_clock_addr = MODE7_base_addr + 6 * MODE7_char_width + 3			; clock displayed at (3, 6)
+META_duration_addr = MODE7_base_addr + 6 * MODE7_char_width + 33		; duration displayed at (33, 6)
+
+
+
+\\ Params block for osfile command
+.osfile_params			SKIP 18
+
+
+
+\\ Temporary vars
+.tmp_var				; SHARED	; free for any function to use but not preserved across subroutines
+.tmp_erase				SKIP 1		; used when erasing rows or pixels
+
+.tmp_col_mask			; SHARED	; scr_init only - used to rotate font glyph data
+.tmp_cur_col			; SHARED	; poll_scr only - current column into font
+.tmp_fx_y				SKIP 1		; poll_fx only - current y value being plotted
+
+.tmp_row_bit			; SHARED	; scr_init only - used to rotate font glyph data
+.tmp_font_byte			SKIP 1		; poll_scr only - current byte of font data
+
+.tmp_msg_idx			SKIP 1		; current index into scr_message - only used during poll_scr
+
+\\ Generic vars
+.writeptr				SKIP 2		; generic write ptr
+.readptr				SKIP 2		; generic read ptr
+
+\\ Scroll text vars
+.scr_msg_idx			SKIP 1		; index into scr_message
+.scr_col				SKIP 1		; current column in first character to be displayed
+.scr_y					SKIP 1		; y coordinate of scroll text
+
+\\ App state vars
+.file_no				SKIP 1		; index into our file table
+.menu_old_file			SKIP 1
+.menu_key_held			SKIP 1
+
+\\ System vars
+.old_eventv				SKIP 2
+
+\\ Meta vars
+.meta_timer				SKIP 1		; countdown timer before updating meta strings
+.meta_idx				SKIP 1		; index into our meta strings
+.meta_poll_count		SKIP 1		; count polls to update clock
+.meta_clock_mins		SKIP 1
+.meta_clock_secs		SKIP 1
+
+\\ Playback timer vars
+.playtime_interval		SKIP 2		; number of audio frames before playtime bar advances by 1 pixel
+.playtime_counter		SKIP 2
+.playtime_index			SKIP 1		; current X offset of playtime bar (0-47)
+
+
+\ ******************************************************************
+\ *	Space hijacked from OS for runtime buffers not preinitialised
+\ ******************************************************************
+
+
+
+
+