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C64: [VIC2] more precise(?) rasterX check for borders

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This commit is contained in:
Gyorgy Szombathelyi
2020-04-05 19:13:11 +02:00
parent fc8c2134e0
commit 8d637b3a67
1 changed files with 3 additions and 3 deletions
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6
cores/c64/rtl/video_vicII_656x_a.vhd
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@@ -41,7 +41,7 @@ architecture rtl of video_vicii_656x is
type spriteColorsDef is array(7 downto 0) of unsigned(3 downto 0);
type pixelColorStoreDef is array(7 downto 0) of unsigned(3 downto 0);
constant PIX_DELAY : integer := 2;
constant PIX_DELAY : integer := 3;
-- State machine
signal lastLineFlag : boolean; -- True for on last line of the frame.
@@ -812,7 +812,7 @@ calcBorders: process(clk)
newTBBorder := TBBorder;
-- 1. If the X coordinate reaches the right comparison value, the main border
-- flip flop is set (comparison values are from VIC II datasheet).
if (rasterX = 339-1 and CSEL = '0') or (rasterX = 348-1 and CSEL = '1') then
if (rasterX = 339 and CSEL = '0') or (rasterX = 348 and CSEL = '1') then
MainBorder <= '1';
end if;
-- 2. If the Y coordinate reaches the bottom comparison value in cycle 63, the
@@ -832,7 +832,7 @@ calcBorders: process(clk)
setTBBorder <= false;
end if;
end if;
if (rasterX = 35-1 and CSEL = '0') or (rasterX = 28-1 and CSEL = '1') then
if (rasterX = 35 and CSEL = '0') or (rasterX = 28 and CSEL = '1') then
-- 4. If the X coordinate reaches the left comparison value and the Y
-- coordinate reaches the bottom one, the vertical border flip flop is set.
-- FIX: act on the already triggered condition