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Extract loop invariant read

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This commit is contained in:
Benoit Daloze 2017-03-05 18:59:46 +01:00
parent c3e8074f96
commit b6be04497f
1 changed files with 1 additions and 1 deletions
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2
lib/waterfoul/ppu.rb
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@ -280,6 +280,7 @@ module Waterfoul
tile_line = line_adjusted % 8 tile_line = line_adjusted % 8
# relative line number offset # relative line number offset
tile_line_offset = tile_line * 2 tile_line_offset = tile_line * 2
palette = $mmu.read_memory_byte 0xFF47
0.upto(31) do |x| 0.upto(31) do |x|
tile = 0 tile = 0
if tiles_select == 0x8800 if tiles_select == 0x8800
@ -304,7 +305,6 @@ module Waterfoul
pixel = (byte_1 & (0x1 << (7 - pixelx)) > 0) ? 1 : 0 pixel = (byte_1 & (0x1 << (7 - pixelx)) > 0) ? 1 : 0
pixel |= (byte_2 & (0x1 << (7 - pixelx)) > 0) ? 2 : 0 pixel |= (byte_2 & (0x1 << (7 - pixelx)) > 0) ? 2 : 0
position = line_width + buffer_addr position = line_width + buffer_addr
palette = $mmu.read_memory_byte 0xFF47
color = (palette >> (pixel * 2)) & 0x3 color = (palette >> (pixel * 2)) & 0x3
@framebuffer[position] = rgb(color) @framebuffer[position] = rgb(color)