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Reshape MMU#[] to share to move common accesses first

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This commit is contained in:
Benoit Daloze 2017-03-05 16:43:01 +01:00
parent c1e927fc1d
commit d4c2f76bc1
1 changed files with 5 additions and 12 deletions
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17
lib/waterfoul/mmu.rb
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@ -30,21 +30,14 @@ module Waterfoul
def [](i)
raise MemoryOutOfBounds if i > MEMORY_SIZE || i < 0
case i
when 0xFF00
if i == 0xFF00
Input.read_keyboard @memory[i]
when 0x0000...0x8000 # ROM Bank 0 + n
@cartridge[i]
when 0x8000...0xA000 # Video RAM
elsif (0x8000...0xA000) === i or (0xC000...0xE000) === i or (0xFE00..0xFFFF) === i
@memory[i]
when 0xA000...0xC000 # RAM Bank
@cartridge[i]
when 0xC000...0xE000 # Internal RAM
@memory[i]
when 0xE000...0xFE00 # Internal RAM (shadow)
elsif (0xE000...0xFE00) === i
@memory[i - 0x2000]
when 0xFE00..0xFFFF # Graphics (OAM), IO, Zero-page
@memory[i]
elsif (0x0000...0x8000) === i or (0xA000...0xC000) === i
@cartridge[i]
end
end