diff options
Diffstat (limited to 'basys3/basys3.srcs/ppu_consts.vhd')
| -rw-r--r-- | basys3/basys3.srcs/ppu_consts.vhd | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/basys3/basys3.srcs/ppu_consts.vhd b/basys3/basys3.srcs/ppu_consts.vhd index 75b6168..4784950 100644 --- a/basys3/basys3.srcs/ppu_consts.vhd +++ b/basys3/basys3.srcs/ppu_consts.vhd @@ -10,6 +10,7 @@ package ppu_consts is constant PPU_RAM_BUS_DATA_WIDTH : natural := 16; -- RAM bus data width constant PPU_FG_SPRITE_COUNT : natural := 128; -- foreground sprites constant PPU_COLOR_OUTPUT_DEPTH : natural := 4; -- VGA output channel depth + constant PPU_RGB_COLOR_OUTPUT_DEPTH : natural := 3 * PPU_COLOR_OUTPUT_DEPTH; constant PPU_PALETTE_COLOR_WIDTH : natural := 3; -- palette index width (within sprite) constant PPU_PALETTE_INDEX_WIDTH : natural := 3; -- palette index width (palette table) constant PPU_PALETTE_CIDX_WIDTH : natural := (PPU_PALETTE_COLOR_WIDTH + PPU_PALETTE_INDEX_WIDTH); -- global palette index width @@ -30,8 +31,11 @@ package ppu_consts is constant PPU_SPRITE_PIDX_WIDTH : natural := 8; -- bits needed to identify horizontal and vertical pixel within sprite constant PPU_SPRITE_POS_H_WIDTH: natural := 4; -- bits needed to identify horizontal pixel within sprite constant PPU_SPRITE_POS_V_WIDTH: natural := 4; -- bits needed to identify vertical pixel within sprite - constant PPU_SCREEN_WIDTH : natural := 320; -- absolute screen width (pixels) - constant PPU_SCREEN_HEIGHT : natural := 240; -- absolute screen height (pixels) + constant PPU_SCREEN_WIDTH : natural := 320; -- absolute screen width (tiny pixels) + constant PPU_SCREEN_HEIGHT : natural := 240; -- absolute screen height (tiny pixels) + constant PPU_NATIVE_SCREEN_WIDTH : natural := 2 * PPU_SCREEN_WIDTH; -- screen width (native pixels) + constant PPU_NATIVE_SCREEN_HEIGHT : natural := 2 * PPU_SCREEN_HEIGHT; -- screen height (native pixels) + constant PPU_DISPCTL_SLBUF_ADDR_WIDTH : natural := ceil_log2(2 * PPU_SCREEN_WIDTH); constant PPU_BG_CANVAS_TILES_H : natural := 40; -- tiles (horizontally) on background canvas constant PPU_BG_CANVAS_TILES_V : natural := 30; -- tiles (vertically) on background canvas constant PPU_BG_CANVAS_TILE_H_WIDTH : natural := 6; -- bits needed to describe horizontal bg tile index (grid coordinates) @@ -44,6 +48,27 @@ package ppu_consts is constant PPU_TMM_CACHE_FETCH_C_COUNT : natural := PPU_SPRITE_WORD_COUNT + 1; constant PPU_TMM_CACHE_FETCH_A_COUNT : natural := PPU_TMM_CACHE_FETCH_C_COUNT * PPU_FG_SPRITE_COUNT; -- amount of clocks to fetch new TMM cache constant PPU_TMM_CACHE_FETCH_A_WIDTH : natural := ceil_log2(PPU_TMM_CACHE_FETCH_A_COUNT); + constant PPU_ACCURATE_FG_SPRITE_COUNT : natural := 16; + constant PPU_PL_TOTAL_STAGES : natural := 14; + -- VGA signal timings (https://tomverbeure.github.io/video_timings_calculator) + constant PPU_VGA_H_ACTIVE : natural := PPU_NATIVE_SCREEN_WIDTH; + constant PPU_VGA_H_PORCH_FRONT : natural := 96; + constant PPU_VGA_H_SYNC : natural := 16; + constant PPU_VGA_H_PORCH_BACK : natural := 48; + constant PPU_VGA_H_BLANK : natural := PPU_VGA_H_PORCH_FRONT + PPU_VGA_H_SYNC + PPU_VGA_H_PORCH_BACK; + constant PPU_VGA_H_TOTAL : natural := PPU_VGA_H_BLANK + PPU_VGA_H_ACTIVE; + constant PPU_VGA_V_ACTIVE : natural := PPU_NATIVE_SCREEN_HEIGHT; + constant PPU_VGA_V_PORCH_FRONT : natural := 10; + constant PPU_VGA_V_SYNC : natural := 2; + constant PPU_VGA_V_PORCH_BACK : natural := 29; + constant PPU_VGA_V_BLANK : natural := PPU_VGA_V_PORCH_FRONT + PPU_VGA_V_SYNC + PPU_VGA_V_PORCH_BACK; + constant PPU_VGA_V_TOTAL : natural := PPU_VGA_V_BLANK + PPU_VGA_V_ACTIVE; + constant PPU_VGA_SIGNAL_PIXEL_IDX_MAX : natural := PPU_VGA_V_TOTAL * PPU_VGA_H_TOTAL; -- horizontal and vertical pixel clock index + constant PPU_VGA_SIGNAL_PIXEL_WIDTH : natural := ceil_log2(PPU_VGA_SIGNAL_PIXEL_IDX_MAX); -- bit width to count total horizontal and vertical pixel clock index + constant PPU_SCREEN_T_POS_X_WIDTH : natural := ceil_log2(PPU_SCREEN_WIDTH); + constant PPU_SCREEN_T_POS_Y_WIDTH : natural := ceil_log2(PPU_SCREEN_HEIGHT); + constant PPU_SCREEN_N_POS_X_WIDTH : natural := ceil_log2(PPU_NATIVE_SCREEN_WIDTH); + constant PPU_SCREEN_N_POS_Y_WIDTH : natural := ceil_log2(PPU_NATIVE_SCREEN_HEIGHT); end package ppu_consts; package body ppu_consts is -- https://stackoverflow.com/questions/21783280/number-of-bits-to-represent-an-integer-in-vhdl |