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bitmap_scanline_renderer_320x240.s
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bitmap_scanline_renderer_320x240.s
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/*
* P8X Game System
* Video Scanline Renderer
*
* 256 or 320 horizontal pixels lines
* 6-bits per pixels (direct palette)
* 8x8 pixels tiles
* 8x8 up to 32x32 pixels sprites
* Full-screen scrolling
*
* Copyright (c) 2015-2018 Marco Maccaferri
* MIT Licensed.
*/
.pasm
.compress off
.equ H_RES, 320
.equ V_RES, 240
.equ SBUF_OFS, 0
.section .cog_bitmap_scanline_renderer_320x240, "ax"
.org 0
mov offset, PAR
shr offset, #2
and offset, #$7
vsync
rdlong a, hub_fi wz
if_nz jmp #$-1 // wait for line counter reset (vsync)
mov sbuf_ptr, hub_palette
rdbyte palette, sbuf_ptr
add sbuf_ptr, #1
rdbyte palette+1, sbuf_ptr
add sbuf_ptr, #1
rdbyte palette+2, sbuf_ptr
add sbuf_ptr, #1
rdbyte palette+3, sbuf_ptr
add sbuf_ptr, #1
rdbyte palette+4, sbuf_ptr
add sbuf_ptr, #1
rdbyte palette+5, sbuf_ptr
add sbuf_ptr, #1
rdbyte palette+6, sbuf_ptr
add sbuf_ptr, #1
rdbyte palette+7, sbuf_ptr
mov scnt, offset
// bitmap
loop
mov loffs, scnt
mov video_ptr, loffs
shl video_ptr, #7
mov ecnt, #32
movd str0, #sbuf
movd str1, #sbuf+1
movd str2, #sbuf+2
movd str3, #sbuf+3
movd str4, #sbuf+4
_l1 rdword pixels1, video_ptr
add video_ptr, #2
mov a, pixels1
and a, #$07
add a, #palette
movs _mv4, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv3, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv2, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv1, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv8, a
rdword pixels1, video_ptr
add video_ptr, #2
mov a, pixels1
and a, #$07
add a, #palette
movs _mv7, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv6, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv5, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv12, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv11, a
rdword pixels1, video_ptr
add video_ptr, #2
mov a, pixels1
and a, #$07
add a, #palette
movs _mv10, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv9, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv16, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv15, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv14, a
rdword pixels1, video_ptr
add video_ptr, #2
mov a, pixels1
and a, #$07
add a, #palette
movs _mv13, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv20, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv19, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv18, a
shr pixels1, #3
mov a, pixels1
and a, #$07
add a, #palette
movs _mv17, a
_mv1 mov colors1, 0-0
shl colors1, #8
_mv2 or colors1, 0-0
shl colors1, #8
_mv3 or colors1, 0-0
shl colors1, #8
_mv4 or colors1, 0-0
str0 mov 0-0, colors1
add str0, inc_dest_5
_mv5 mov colors1, 0-0
shl colors1, #8
_mv6 or colors1, 0-0
shl colors1, #8
_mv7 or colors1, 0-0
shl colors1, #8
_mv8 or colors1, 0-0
str1 mov 0-0, colors1
add str1, inc_dest_5
_mv9 mov colors1, 0-0
shl colors1, #8
_mv10 or colors1, 0-0
shl colors1, #8
_mv11 or colors1, 0-0
shl colors1, #8
_mv12 or colors1, 0-0
str2 mov 0-0, colors1
add str2, inc_dest_5
_mv13 mov colors1, 0-0
shl colors1, #8
_mv14 or colors1, 0-0
shl colors1, #8
_mv15 or colors1, 0-0
shl colors1, #8
_mv16 or colors1, 0-0
str3 mov 0-0, colors1
add str3, inc_dest_5
_mv17 mov colors1, 0-0
shl colors1, #8
_mv18 or colors1, 0-0
shl colors1, #8
_mv19 or colors1, 0-0
shl colors1, #8
_mv20 or colors1, 0-0
str4 mov 0-0, colors1
add str4, inc_dest_5
djnz ecnt, #_l1
// scanline buffer output
emit
rdlong a, hub_fi
cmp a, scnt wz,wc
if_ne jmp #$-2 // wait for line fetch start
mov sbuf_ptr, hub_sbuf
wrlong sbuf, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 1, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 2, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 3, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 4, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 5, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 6, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 7, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 8, sbuf_ptr
add sbuf_ptr, #4
wrlong sbuf + 9, sbuf_ptr
add sbuf_ptr, #4
movd _wr0, #sbuf +(H_RES/4) -1
movd _wr1, #sbuf +(H_RES/4) -2
add sbuf_ptr, #(H_RES-40) -1
movi sbuf_ptr, #((H_RES/4)-10) -2
_wr0 wrlong 0-0, sbuf_ptr
sub _wr0, inc_dest_2
sub sbuf_ptr, i2s7 wc
_wr1 wrlong 0-0, sbuf_ptr
sub _wr1, inc_dest_2
if_nc djnz sbuf_ptr, #_wr0
add scnt, #COGS // next line to render
cmp scnt, #V_RES wc,wz
if_b jmp #loop
jmp #vsync
// driver parameters
hub_video_ram long $0000
hub_palette long $7800
hub_fi long $7EBC
hub_sbuf long $7EC0 + SBUF_OFS
// initialised data and/or presets
inc_dest long 1 << 9
inc_dest_2 long 2 << 9
inc_dest_5 long 5 << 9
i2s7 long 2 << 23 | 7
pixels1 long 0
colors1 long 0
palette long $00, $C0, $30, $F0, $0C, $CC, $3C, $FC
// uninitialised data and/or temporaries
a res 1
data1 res 1
data2 res 1
offset res 1
loffs res 1
ecnt res 1
scnt res 1
video_ptr res 1
// code and/or data repurposed for scanline buffer
sbuf_ptr res 1
sbuf
fit $1F0
/*
* TERMS OF USE: MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
* is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/