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updated usage of enable bits

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This commit is contained in:
Matthew Berry 2022-10-30 18:41:32 -07:00
parent d864b27e35
commit 69c671730b
2 changed files with 11 additions and 19 deletions
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12
src/crab/gba/ppu.cr
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@ -219,7 +219,7 @@ module GBA
end
def render_sprites : Nil
return unless @dispcnt.screen_display_obj
return unless bit?(@dispcnt.value, 12)
base = 0x10000_u32
sprites = @oam.unsafe_slice_of(Sprite)
sprites.each do |sprite|
@ -312,15 +312,15 @@ module GBA
# Returns a u16 representing the layer enable bits and a bool indicating whether effects are enabled.
def get_enables(col : Int) : Tuple(UInt16, Bool)
if @dispcnt.window_0_display && @win0h.x1 <= col < @win0h.x2 && @win0v.y1 <= @vcount < @win0v.y2 # win0
{bits(@winin.value, 0..4), @winin.window_0_color_special_effect}
{@winin.window_0_enable_bits, @winin.window_0_color_special_effect}
elsif @dispcnt.window_1_display && @win1h.x1 <= col < @win1h.x2 && @win1v.y1 <= @vcount < @win1v.y2 # win1
{bits(@winin.value, 8..12), @winin.window_1_color_special_effect}
{@winin.window_1_enable_bits, @winin.window_1_color_special_effect}
elsif @dispcnt.obj_window_display && @sprite_pixels[col].window # obj win
{bits(@winout.value, 8..12), @winout.obj_window_color_special_effect}
{@winout.obj_window_enable_bits, @winout.obj_window_color_special_effect}
elsif @dispcnt.window_0_display || @dispcnt.window_1_display || @dispcnt.obj_window_display # winout
{bits(@winout.value, 0..4), @winout.outside_color_special_effect}
{@winout.outside_enable_bits, @winout.outside_color_special_effect}
else # no windows
{bits(@dispcnt.value, 8..12), true}
{@dispcnt.default_enable_bits, true}
end
end

18
src/crab/gba/reg.cr
View file

@ -144,11 +144,7 @@ module GBA
bool hblank_interval_free # (1=Allow access to OAM during H-Blank)
bool obj_mapping_1d # (0=Two dimensional, 1=One dimensional)
bool forced_blank # (1=Allow access to VRAM,Palette,OAM)
bool screen_display_bg0
bool screen_display_bg1
bool screen_display_bg2
bool screen_display_bg3
bool screen_display_obj
num default_enable_bits, 5
bool window_0_display
bool window_1_display
bool obj_window_display
@ -221,24 +217,20 @@ module GBA
class WININ < BitField(UInt16)
include Base16
num window_0_enable_bits, 4
bool window_0_obj_enable
num window_0_enable_bits, 5
bool window_0_color_special_effect
num not_used_0, 2, read_only: true
num window_1_enable_bits, 4
bool window_1_obj_enable
num window_1_enable_bits, 5
bool window_1_color_special_effect
num not_used_1, 2, read_only: true
end
class WINOUT < BitField(UInt16)
include Base16
num outside_enable_bits, 4
bool outside_obj_enable
num outside_enable_bits, 5
bool outside_color_special_effect
num not_used_outside, 2, read_only: true
num obj_window_enable_bits, 4
bool obj_window_obj_enable
num obj_window_enable_bits, 5
bool obj_window_color_special_effect
num not_used_obj, 2, read_only: true
end