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brightness effects for sprites, allows official bios to render properly

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Matthew Berry 2021-02-04 00:09:58 -08:00
parent 0e30f3558b
commit 08cc652722
1 changed files with 11 additions and 2 deletions
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13
src/crab/ppu.cr
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@ -304,8 +304,17 @@ class PPU
if sprite_pixel.priority == priority && sprite_pixel.palette > 0
selected_color = (@pram + 0x200).to_unsafe.as(UInt16*)[sprite_pixel.palette]
if top_color.nil? # todo: brightness for sprites
top_color = selected_color
return top_color unless sprite_pixel.blends || (@bldcnt.is_bg_target(4, target: 1) && effects)
if !(sprite_pixel.blends || (@bldcnt.is_bg_target(4, target: 1) && effects))
return selected_color
elsif @bldcnt.color_special_effect == 1 # alpha blending
top_color = selected_color
elsif @bldcnt.color_special_effect == 2 # brightness increase
bgr16 = BGR16.new(selected_color)
return (bgr16 + (BGR16.new(0xFFFF) - bgr16) * (Math.min(16, @bldy.evy_coefficient) / 16)).value
else # brightness decrease
bgr16 = BGR16.new(selected_color)
return (bgr16 - bgr16 * (Math.min(16, @bldy.evy_coefficient) / 16)).value
end
else
if @bldcnt.is_bg_target(4, target: 2) || sprite_pixel.blends
color = BGR16.new(top_color) * (Math.min(16, @bldalpha.eva_coefficient) / 16) + BGR16.new(selected_color) * (Math.min(16, @bldalpha.evb_coefficient) / 16)