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https://github.com/colby-swandale/waterfoul
synced 2024-12-26 21:58:54 +01:00
re-enable drawing sprites and windows
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Colby
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03de70423b
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84c90c4665
1 changed files with 132 additions and 0 deletions
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@ -29,6 +29,7 @@ module Waterfoul
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@vblank_line = 0
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@auxillary_modeclock = 0
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@screen_enabled = true
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@window_line = 0
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end
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def step(cycles = 1)
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@ -53,6 +54,7 @@ module Waterfoul
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@modeclock = 0
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@mode = 0
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@auxillary_modeclock = 0
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@window_line = 0
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reset_current_line
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update_stat_mode
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compare_lylc
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@ -92,6 +94,7 @@ module Waterfoul
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@mode = V_BLANK_STATE
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@auxillary_modeclock = @modeclock
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@vblank = true
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@window_line = 0
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Interrupt.request_interrupt(Interrupt::INTERRUPT_VBLANK)
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end
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@ -120,6 +123,8 @@ module Waterfoul
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def scanline
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render_bg
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render_window
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render_sprites
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end
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def update_stat_mode
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@ -128,6 +133,133 @@ module Waterfoul
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$mmu.write_byte 0xFF41, new_stat
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end
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def render_window
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line = current_line
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line_width = line * Screen::SCREEN_WIDTH
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# dont render if the window is outside the bounds of the screen or
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# if the LCDC window enable bit flag is not set
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return if @window_line > 143 || !IO::LCDControl.window_enabled?
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window_pos_x = $mmu.read_byte(0xFF4B) - 7
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window_pos_y = $mmu.read_byte(0xFF4A)
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# don't render if the window is outside the bounds of the screen
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return if window_pos_x > 159 || window_pos_y > 143 || window_pos_y > line
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map_select = IO::LCDControl.window_map_select
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tiles_select = IO::LCDControl.bg_tile_select
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line_adjusted = @window_line
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y_offset = (line_adjusted / 8) * 32
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tile_line = line_adjusted % 8
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tile_line_offset = tile_line * 2
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0.upto(31) do |x|
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tile = 0
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if tiles == 0x8800
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tile = signed_value $mmu.read_byte(map_select + y_offset + x)
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tile += 128
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else
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tile = $mmu.read_byte map_select + y_offset + x
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end
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line_pixel_offset = x * 8
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tile_select_offset = tile * 16
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tile_address = tiles_select + tile_select_offset + tile_line_offset
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byte_1 = $mmu.read_byte tile_address
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byte_2 = $mmu.read_byte (tile_address + 1)
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0.upto(7) do |pixelx|
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buffer_addr = line_pixel_offset + pixelx + wx
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next if buffer_addr < 0 || buffer_addr >= SCREEN_WIDTH
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shift 0x1 << (7 - pixelx)
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pixel = 0
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if (byte_1 & shift == shift) && (byte_2 & shift == shift)
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pixel = 3
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elsif (byte_1 & shift == 0x0) && (byte_2 & shift == shift)
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pixel = 1
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elsif (byte_1 & shift == shift) && (byte_2 & shift == 0x0)
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pixel = 2
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elsif (byte_1 & shift == 0x0) && (byte_2 & shift == 0x00)
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pixel = 0
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end
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position = line_width + buffer_addr
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@framebuffer[position] = pixel
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end
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end
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@window_line += 1
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end
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def render_sprites
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line = current_line
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line_width = line * Screen::SCREEN_WIDTH
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return unless IO::LCDControl.obj_display
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sprite_size = IO::LCDControl.obj_size
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39.downto(0) do |sprite|
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sprite_offset = sprite * 4
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sprite_y = $mmu.read_byte(0xFE00 + sprite_offset) - 16
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next if sprite_y > line || (sprite_y + sprite_size) <= line
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sprite_x = $mmu.read_byte(0xFE00 + sprite_offset + 1) - 8
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next if sprite_x < -7 || sprite_x >= SCREEN_WIDTH
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sprite_tile_offset = ($mmu.read_byte(0xFE00 + sprite_offset + 2) & (sprite_size == 16 ? 0xFE : 0xFF)) * 16
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sprite_flags = $mmu.read_byte(0xFE00 + sprite_offset + 3)
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x_flip = sprite_flags & 0x20 == 0x20 ? true : false
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y_flip = sprite_flags & 0x40 == 0x40 ? true : false
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#above_bg = sprite_flags & 0x80 == 0x80 ? true : false
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tiles = 0x8000
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pixel_y = y_flip ? (sprite_size == 16 ? 15 : 7) - (line - sprite_y) : line - sprite_y
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pixel_y_2 = 0
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offset = 0
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if sprite_size == 16 && (pixel_y >= 8)
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pixel_y_2 = (pixel_y - 8) * 2
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offset = 16
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else
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pixel_y_2 = pixel_y * 2
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end
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tile_address = tiles + sprite_tile_offset + pixel_y_2 + offset
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byte_1 = $mmu.read_byte tile_address
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byte_2 = $mmu.read_byte (tile_address + 1)
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0.upto(7) do |pixelx|
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shift = 0x1 << (x_flip ? pixelx : 7 - pixelx)
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pixel = 0
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if (byte_1 & shift == shift) && (byte_2 & shift == shift)
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pixel = 3
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elsif (byte_1 & shift == 0x0) && (byte_2 & shift == shift)
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pixel = 1
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elsif (byte_1 & shift == shift) && (byte_2 & shift == 0x0)
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pixel = 2
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elsif (byte_1 & shift == 0x0) && (byte_2 & shift == 0x00)
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pixel = 0
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end
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buffer_x = sprite_x + pixelx
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next if buffer_x < 0 || buffer_x >= Screen::SCREEN_WIDTH
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position = line_width + buffer_x
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@framebuffer[position] = pixel
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end
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end
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end
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def render_bg
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line = current_line
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line_width = line * Screen::SCREEN_WIDTH
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