Browse code
Clear screen when ROM is loaded.
Andrew Alderwick authored on 22/09/2021 15:41:25
Showing 2 changed files
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@@ -4,11 +4,10 @@ |
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and has non-zero length, this function does not return, because the new ROM |
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is executing in its place. |
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- Both stacks are cleared and all the device vectors are written to zero as a |
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- convenience, but the screen is not cleared. All ROMs that use the screen |
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- define the palette (usually in the reset vector) so that should clear the |
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- screen anyway. All other device bytes are left untouched, so they could |
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- introduce a device state to the next ROM that it's not expecting. |
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+ The screen and both stacks are cleared and all the device vectors are |
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+ written to zero as a convenience. All other device bytes are left |
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+ untouched, so they could introduce a device state to the next ROM that |
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+ it's not expecting. |
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) |
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.File/name DEO2 |
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@@ -32,6 +31,31 @@ |
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POPr |
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.System/rst DEI ,&rst-loop JCN |
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+ ( clear screen ) |
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+ #01 .Screen/auto DEO |
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+ #0000 .Screen/y DEO2 |
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+ .Screen/width DEI2 #0007 ADD2 #03 SFT2 #ffff MUL2 STH2 |
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+ &screen-yloop |
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+ #0000 .Screen/x DEO2 |
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+ STH2kr |
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+ &screen-xloop-bg |
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+ #00 .Screen/sprite DEO |
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+ INC2 |
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+ ORAk ,&screen-xloop-bg JCN |
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+ POP2 |
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+ #0000 .Screen/x DEO2 |
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+ STH2kr |
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+ &screen-xloop-fg |
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+ #40 .Screen/sprite DEO |
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+ INC2 |
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+ ORAk ,&screen-xloop-fg JCN |
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+ POP2 |
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+ .Screen/y DEI2 #0008 ADD2 |
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+ DUP2 .Screen/y DEO2 |
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+ .Screen/height DEI2 LTH2 ,&screen-yloop JCN |
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+ POP2r |
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+ #00 .Screen/auto DEO |
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+ |
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( reset device vectors ) |
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LIT2r 0000 #00 |
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&device-vector-loop |
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@@ -19,7 +19,7 @@ |
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|00 @System [ &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1 ] |
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|10 @Console [ &vector $2 &read $1 &pad $5 &write $1 &error $1 ] |
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-|20 @Screen &vector $2 &width $2 &height $2 &pad $2 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1 |
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+|20 @Screen &vector $2 &width $2 &height $2 &auto $1 &pad $1 &x $2 &y $2 &addr $2 &pixel $1 &sprite $1 |
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|80 @Controller [ &vector $2 &button $1 &key $1 ] |
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|90 @Mouse [ &vector $2 &x $2 &y $2 &state $1 &wheel $1 ] |
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|a0 @File &vector $2 &success $2 &offset-hs $2 &offset-ls $2 &name $2 &length $2 &load $2 &save $2 |