mirror of
https://github.com/RaySollium99/picodrive.git
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937 lines
24 KiB
ArmAsm
937 lines
24 KiB
ArmAsm
/*
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* assembly optimized versions of most funtions from draw2.c
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* (C) notaz, 2006-2008
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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*
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* this is highly specialized, be careful if changing related C code!
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*/
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.extern Pico
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.extern PicoDraw2FB
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@ define these constants in your include file:
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@ .equiv START_ROW, 1
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@ .equiv END_ROW, 27
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@ one row means 8 pixels. If above example was used, (27-1)*8=208 lines would be rendered.
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#ifndef START_ROW
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#define START_ROW 0
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#endif
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#ifndef END_ROW
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#define END_ROW 28
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#endif
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.text
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.align 2
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.global BackFillFull @ int reg7
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BackFillFull:
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stmfd sp!, {r4-r9,lr}
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ldr lr, =PicoDraw2FB @ lr=PicoDraw2FB
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mov r0, r0, lsl #26
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ldr lr, [lr]
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mov r0, r0, lsr #26
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add lr, lr, #328*8
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orr r0, r0, r0, lsl #8
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orr r0, r0, r0, lsl #16
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mov r1, r0 @ 25 opcodes wasted?
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mov r2, r0
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mov r3, r0
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mov r4, r0
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mov r5, r0
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mov r6, r0
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mov r7, r0
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mov r8, r0
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mov r9, r0
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mov r12, #(END_ROW-START_ROW)*8
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@ go go go!
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.bff_loop:
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add lr, lr, #8
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subs r12, r12, #1
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stmia lr!, {r0-r9} @ 10*4*8
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stmia lr!, {r0-r9}
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stmia lr!, {r0-r9}
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stmia lr!, {r0-r9}
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stmia lr!, {r0-r9}
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stmia lr!, {r0-r9}
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stmia lr!, {r0-r9}
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stmia lr!, {r0-r9}
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bne .bff_loop
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ldmfd sp!, {r4-r9,r12}
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bx r12
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.pool
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@ -------- some macros --------
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@ helper
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@ TileLineSinglecol (r1=pdest, r2=pixels8, r3=pal) r4: scratch, r0: pixels8_old
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.macro TileLineSinglecol notsinglecol=0
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and r2, r2, #0xf @ #0x0000000f
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.if !\notsinglecol
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cmp r2, r0, lsr #28 @ if these don't match,
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bicne r9, r9, #2 @ it is a sign that whole tile is not singlecolor (only it's lines may be)
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.endif
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orr r4, r3, r2
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orr r4, r4, r4, lsl #8
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tst r1, #1 @ not aligned?
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strneb r4, [r1], #1
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streqh r4, [r1], #2
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strh r4, [r1], #2
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strh r4, [r1], #2
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strh r4, [r1], #2
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strneb r4, [r1], #1 @ have a remaining unaligned pixel?
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sub r1, r1, #8
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.if !\notsinglecol
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mov r0, #0xf
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orr r0, r0, r2, lsl #28 @ we will need the old palindex later
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.endif
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.endm
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@ TileNorm (r1=pdest, r2=pixels8, r3=pal) r0,r4: scratch
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.macro TileLineNorm
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ands r4, r0, r2, lsr #12 @ #0x0000f000
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orrne r4, r3, r4
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strneb r4, [r1]
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ands r4, r0, r2, lsr #8 @ #0x00000f00
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orrne r4, r3, r4
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strneb r4, [r1,#1]
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ands r4, r0, r2, lsr #4 @ #0x000000f0
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orrne r4, r3, r4
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strneb r4, [r1,#2]
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ands r4, r0, r2 @ #0x0000000f
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orrne r4, r3, r4
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strneb r4, [r1,#3]
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ands r4, r0, r2, lsr #28 @ #0xf0000000
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orrne r4, r3, r4
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strneb r4, [r1,#4]
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ands r4, r0, r2, lsr #24 @ #0x0f000000
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orrne r4, r3, r4
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strneb r4, [r1,#5]
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ands r4, r0, r2, lsr #20 @ #0x00f00000
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orrne r4, r3, r4
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strneb r4, [r1,#6]
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ands r4, r0, r2, lsr #16 @ #0x000f0000
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orrne r4, r3, r4
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strneb r4, [r1,#7]
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.endm
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@ TileFlip (r1=pdest, r2=pixels8, r3=pal) r0,r4: scratch
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.macro TileLineFlip
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ands r4, r0, r2, lsr #16 @ #0x000f0000
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orrne r4, r3, r4
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strneb r4, [r1]
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ands r4, r0, r2, lsr #20 @ #0x00f00000
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orrne r4, r3, r4
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strneb r4, [r1,#1]
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ands r4, r0, r2, lsr #24 @ #0x0f000000
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orrne r4, r3, r4
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strneb r4, [r1,#2]
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ands r4, r0, r2, lsr #28 @ #0xf0000000
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orrne r4, r3, r4
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strneb r4, [r1,#3]
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ands r4, r0, r2 @ #0x0000000f
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orrne r4, r3, r4
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strneb r4, [r1,#4]
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ands r4, r0, r2, lsr #4 @ #0x000000f0
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orrne r4, r3, r4
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strneb r4, [r1,#5]
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ands r4, r0, r2, lsr #8 @ #0x00000f00
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orrne r4, r3, r4
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strneb r4, [r1,#6]
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ands r4, r0, r2, lsr #12 @ #0x0000f000
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orrne r4, r3, r4
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strneb r4, [r1,#7]
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.endm
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@ Tile (r1=pdest, r3=pal, r9=prevcode, r10=Pico.vram) r2,r4,r7: scratch, r0=0xf
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.macro Tile hflip vflip
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mov r7, r9, lsl #13 @ r9=code<<8; addr=(code&0x7ff)<<4;
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add r7, r10, r7, lsr #16
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orr r9, r9, #3 @ emptytile=singlecolor=1, r9 must be <code_16> 00000xxx
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.if \vflip
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@ we read tilecodes in reverse order if we have vflip
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add r7, r7, #8*4
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.endif
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@ loop through 8 lines
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orr r9, r9, #(7<<24)
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b 1f @ loop_enter
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0: @ singlecol_loop
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subs r9, r9, #(1<<24)
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add r1, r1, #328 @ set pointer to next line
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bmi 8f @ loop_exit with r0 restore
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1:
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.if \vflip
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ldr r2, [r7, #-4]! @ pack=*(unsigned int *)(Pico.vram+addr); // Get 8 pixels
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.else
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ldr r2, [r7], #4
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.endif
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tst r2, r2
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beq 2f @ empty line
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bic r9, r9, #1
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cmp r2, r2, ror #4
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bne 3f @ not singlecolor
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TileLineSinglecol
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b 0b
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2:
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bic r9, r9, #2
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2: @ empty_loop
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subs r9, r9, #(1<<24)
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add r1, r1, #328 @ set pointer to next line
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bmi 8f @ loop_exit with r0 restore
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.if \vflip
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ldr r2, [r7, #-4]! @ next pack
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.else
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ldr r2, [r7], #4
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.endif
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mov r0, #0xf @ singlecol_loop might have messed r0
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tst r2, r2
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beq 2b
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bic r9, r9, #3 @ if we are here, it means we have empty and not empty line
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b 5f
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3: @ not empty, not singlecol
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mov r0, #0xf
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bic r9, r9, #3
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b 6f
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4: @ not empty, not singlecol loop
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subs r9, r9, #(1<<24)
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add r1, r1, #328 @ set pointer to next line
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bmi 9f @ loop_exit
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.if \vflip
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ldr r2, [r7, #-4]! @ next pack
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.else
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ldr r2, [r7], #4
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.endif
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tst r2, r2
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beq 4b @ empty line
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5:
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cmp r2, r2, ror #4
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beq 7f @ singlecolor line
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6:
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.if \hflip
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TileLineFlip
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.else
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TileLineNorm
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.endif
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b 4b
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7:
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TileLineSinglecol 1
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b 4b
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8:
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mov r0, #0xf
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9: @ loop_exit
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add r9, r9, #(1<<24) @ fix r9
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sub r1, r1, #328*8 @ restore pdest pointer
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.endm
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@ TileLineSinglecolAl (r1=pdest, r4,r7=color)
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.macro TileLineSinglecolAl0
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stmia r1!, {r4,r7}
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add r1, r1, #320
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.endm
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.macro TileLineSinglecolAl1
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strb r4, [r1], #1
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strh r4, [r1], #2
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str r4, [r1], #4
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strb r4, [r1], #1+320
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@ add r1, r1, #320
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.endm
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.macro TileLineSinglecolAl2
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strh r4, [r1], #2
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str r4, [r1], #4
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strh r4, [r1], #2
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add r1, r1, #320
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.endm
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.macro TileLineSinglecolAl3
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strb r4, [r1], #1
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str r4, [r1], #4
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strh r4, [r1], #2
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strb r4, [r1], #1+320
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@ add r1, r1, #320
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.endm
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@ TileSinglecol (r1=pdest, r2=pixels8, r3=pal) r4,r7: scratch, r0=0xf
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@ kaligned==1, if dest is always aligned
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.macro TileSinglecol kaligned=0
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and r4, r2, #0xf @ we assume we have good r2 from previous time
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orr r4, r4, r3
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orr r4, r4, r4, lsl #8
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orr r4, r4, r4, lsl #16
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mov r7, r4
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.if !\kaligned
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tst r1, #2 @ not aligned?
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bne 2f
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tst r1, #1
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bne 1f
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.endif
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TileLineSinglecolAl0
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TileLineSinglecolAl0
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TileLineSinglecolAl0
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TileLineSinglecolAl0
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TileLineSinglecolAl0
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TileLineSinglecolAl0
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TileLineSinglecolAl0
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TileLineSinglecolAl0
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.if !\kaligned
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b 4f
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1:
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TileLineSinglecolAl1
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TileLineSinglecolAl1
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TileLineSinglecolAl1
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TileLineSinglecolAl1
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TileLineSinglecolAl1
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TileLineSinglecolAl1
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TileLineSinglecolAl1
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TileLineSinglecolAl1
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b 4f
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2:
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tst r1, #1
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bne 3f
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TileLineSinglecolAl2
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TileLineSinglecolAl2
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TileLineSinglecolAl2
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TileLineSinglecolAl2
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TileLineSinglecolAl2
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TileLineSinglecolAl2
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TileLineSinglecolAl2
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TileLineSinglecolAl2
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b 4f
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3:
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TileLineSinglecolAl3
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TileLineSinglecolAl3
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TileLineSinglecolAl3
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TileLineSinglecolAl3
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TileLineSinglecolAl3
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TileLineSinglecolAl3
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TileLineSinglecolAl3
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TileLineSinglecolAl3
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4:
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.endif
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sub r1, r1, #328*8 @ restore pdest pointer
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.endm
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@ DrawLayerTiles(*hcache, *scrpos, (cells<<24)|(nametab<<9)|(vscroll&0x3ff)<<11|(shift[width]<<8)|planeend, (ymask<<24)|(planestart<<16)|[htab||hscroll]
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@static void DrawLayerFull(int plane, int *hcache, int planestart, int planeend)
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.global DrawLayerFull
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DrawLayerFull:
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stmfd sp!, {r4-r11,lr}
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mov r6, r1 @ hcache
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ldr r11, =(Pico+0x22228) @ Pico.video
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ldr r10, =(Pico+0x10000) @ r10=Pico.vram
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ldrb r5, [r11, #13] @ pvid->reg[13]
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ldrb r7, [r11, #11]
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sub lr, r3, r2
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and lr, lr, #0x00ff0000 @ lr=cells
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mov r5, r5, lsl #10 @ htab=pvid->reg[13]<<9; (halfwords)
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add r5, r5, r0, lsl #1 @ htab+=plane
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bic r5, r5, #0x00ff0000 @ just in case
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tst r7, #3 @ full screen scroll? (if ==0)
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ldrb r7, [r11, #16] @ ??hh??ww
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ldreqh r5, [r10, r5]
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biceq r5, r5, #0x0000fc00 @ r5=hscroll (0-0x3ff)
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movne r5, r5, lsr #1
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orrne r5, r5, #0x8000 @ this marks that we have htab pointer, not hscroll here
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and r8, r7, #3
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orr r5, r5, r7, lsl #1+24
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orr r5, r5, #0x1f000000
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cmp r8, #1
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biclt r5, r5, #0x80000000
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biceq r5, r5, #0xc0000000
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bicgt r5, r5, #0xe0000000
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mov r9, r2, lsl #24
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orr r5, r5, r9, lsr #8 @ r5=(ymask<<24)|(trow<<16)|[htab||hscroll]
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add r4, r8, #5
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cmp r4, #7
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subge r4, r4, #1 @ r4=shift[width] (5,6,6,7)
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orr lr, lr, r4
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orr lr, lr, r3, lsl #24 @ lr=(planeend<<24)|(cells<<16)|shift[width]
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@ calculate xmask:
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mov r8, r8, lsl #24+5
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orr r8, r8, #0x1f000000
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@ Find name table:
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tst r0, r0
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ldreqb r4, [r11, #2]
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moveq r4, r4, lsr #3
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ldrneb r4, [r11, #4]
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and r4, r4, #7
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orr lr, lr, r4, lsl #13 @ lr|=nametab_bits{3}<<13
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ldr r11, =PicoDraw2FB @ r11=PicoDraw2FB
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sub r4, r9, #(START_ROW<<24)
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ldr r11, [r11]
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mov r4, r4, asr #24
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mov r7, #328*8
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mla r11, r4, r7, r11 @ scrpos+=8*328*(planestart-START_ROW);
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@ Get vertical scroll value:
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add r7, r10, #0x012000
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add r7, r7, #0x000180 @ r7=Pico.vsram (Pico+0x22180)
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ldr r7, [r7]
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tst r0, r0
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moveq r7, r7, lsl #22
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movne r7, r7, lsl #6
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mov r7, r7, lsr #22 @ r7=vscroll (10 bits)
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orr lr, lr, r7, lsl #3
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mov lr, lr, ror #24 @ packed: cccccccc nnnvvvvv vvvvvsss pppppppp: cells, nametab, vscroll, shift[width], planeend
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ands r7, r7, #7
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addne lr, lr, #1 @ we have vertically clipped tiles due to vscroll, so we need 1 more row
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rsb r7, r7, #8
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str r7, [r6], #4 @ push y-offset to tilecache
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mov r4, #328
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mla r11, r4, r7, r11 @ scrpos+=(8-(vscroll&7))*328;
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mov r9, #0xff000000 @ r9=(prevcode<<8)|flags: 1~tile empty, 2~tile singlecolor
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.rtrloop_outer:
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mov r4, lr, lsl #11
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mov r4, r4, lsr #25 @ r4=vscroll>>3 (7 bits)
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add r4, r4, r5, lsr #16 @ +trow
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and r4, r4, r5, lsr #24 @ &=ymask
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mov r7, lr, lsr #8
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and r7, r7, #7 @ shift[width]
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mov r0, lr, lsr #9
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and r0, r0, #0x7000 @ nametab
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add r12,r0, r4, lsl r7 @ nametab_row = nametab + (((trow+(vscroll>>3))&ymask)<<shift[width]);
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mov r4, lr, lsr #24
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orr r12,r12,r4, lsl #23
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mov r12,r12,lsl #1 @ (nametab_row|(cells<<24)) (halfword compliant)
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@ htab?
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tst r5, #0x8000
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moveq r7, r5, lsl #22 @ hscroll (0-3FFh)
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moveq r7, r7, lsr #22
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beq .rtr_hscroll_done
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@ get hscroll from htab
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mov r7, r5, lsl #17
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ands r4, r5, #0x00ff0000
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add r7, r7, r4, lsl #5 @ +=trow<<4
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andne r4, lr, #0x3800
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subne r7, r7, r4, lsl #7 @ if(trow) htaddr-=(vscroll&7)<<1;
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mov r7, r7, lsr #16 @ halfwords
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ldrh r7, [r10, r7]
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.rtr_hscroll_done:
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and r8, r8, #0xff000000
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rsb r4, r7, #0 @ r4=tilex=(-ts->hscroll)>>3
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mov r4, r4, asr #3
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and r4, r4, #0xff
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orr r8, r8, r4 @ r8=(xmask<<24)|tilex
|
|
|
|
sub r7, r7, #1
|
|
and r7, r7, #7
|
|
add r7, r7, #1 @ r7=dx=((ts->hscroll-1)&7)+1
|
|
|
|
cmp r7, #8
|
|
subeq r12,r12, #0x01000000 @ we will loop cells+1 times, so loop less when there is no hscroll
|
|
|
|
add r1, r11, r7 @ r1=pdest
|
|
mov r0, #0xf
|
|
b .rtrloop_enter
|
|
|
|
@ r4 & r7 are scratch in this loop
|
|
.rtrloop: @ 40-41 times
|
|
add r1, r1, #8
|
|
subs r12,r12, #0x01000000
|
|
add r8, r8, #1
|
|
bmi .rtrloop_exit
|
|
|
|
.rtrloop_enter:
|
|
and r7, r8, r8, lsr #24
|
|
add r7, r10, r7, lsl #1
|
|
bic r4, r12, #0xff000000 @ Pico.vram[nametab_row+(tilex&xmask)];
|
|
ldrh r7, [r7, r4] @ r7=code (int, but from unsigned, no sign extend)
|
|
|
|
tst r7, #0x8000
|
|
bne .rtr_hiprio
|
|
|
|
cmp r7, r9, lsr #8
|
|
bne .rtr_notsamecode
|
|
@ we know stuff about this tile already
|
|
tst r9, #1
|
|
bne .rtrloop @ empty tile
|
|
tst r9, #2
|
|
bne .rtr_singlecolor @ singlecolor tile
|
|
b .rtr_samecode
|
|
|
|
.rtr_notsamecode:
|
|
and r4, r9, #0x600000
|
|
mov r9, r7, lsl #8 @ remember new code
|
|
|
|
@ update cram
|
|
and r7, r7, #0x6000
|
|
mov r3, r7, asr #9 @ r3=pal=((code&0x6000)>>9);
|
|
|
|
.rtr_samecode:
|
|
tst r9, #0x100000 @ vflip?
|
|
bne .rtr_vflip
|
|
|
|
tst r9, #0x080000 @ hflip?
|
|
bne .rtr_hflip
|
|
|
|
@ Tile (r1=pdest, r3=pal, r9=prevcode, r10=Pico.vram) r2,r4,r7: scratch, r0=0xf
|
|
Tile 0, 0
|
|
b .rtrloop
|
|
|
|
.rtr_hflip:
|
|
Tile 1, 0
|
|
b .rtrloop
|
|
|
|
.rtr_vflip:
|
|
tst r9, #0x080000 @ hflip?
|
|
bne .rtr_vflip_hflip
|
|
|
|
Tile 0, 1
|
|
b .rtrloop
|
|
|
|
.rtr_vflip_hflip:
|
|
Tile 1, 1
|
|
b .rtrloop
|
|
|
|
.rtr_singlecolor:
|
|
TileSinglecol
|
|
b .rtrloop
|
|
|
|
.rtr_hiprio:
|
|
@ *(*hcache)++ = code|(dx<<16)|(trow<<27);
|
|
sub r4, r1, r11
|
|
orr r7, r7, r4, lsl #16
|
|
and r4, r5, #0x00ff0000
|
|
orr r7, r7, r4, lsl #11 @ (trow<<27)
|
|
str r7, [r6], #4 @ cache hi priority tile
|
|
b .rtrloop
|
|
|
|
.rtrloop_exit:
|
|
add r5, r5, #0x00010000
|
|
mov r4, r5, lsl #8
|
|
cmp r4, lr, lsl #24
|
|
bge .rtrloop_outer_exit
|
|
add r11, r11, #328*8
|
|
b .rtrloop_outer
|
|
|
|
.rtrloop_outer_exit:
|
|
|
|
@ terminate cache list
|
|
mov r0, #0
|
|
str r0, [r6] @ save cache pointer
|
|
|
|
ldmfd sp!, {r4-r11,lr}
|
|
bx lr
|
|
|
|
.pool
|
|
|
|
|
|
|
|
.global DrawTilesFromCacheF @ int *hc
|
|
|
|
DrawTilesFromCacheF:
|
|
stmfd sp!, {r4-r10,lr}
|
|
|
|
mov r9, #0xff000000 @ r9=prevcode=-1
|
|
mvn r6, #0 @ r6=prevy=-1
|
|
|
|
ldr r4, =PicoDraw2FB @ r4=PicoDraw2FB
|
|
ldr r1, [r0], #4 @ read y offset
|
|
ldr r4, [r4]
|
|
mov r7, #328
|
|
mla r1, r7, r1, r4
|
|
sub r12, r1, #(328*8*START_ROW) @ r12=scrpos
|
|
|
|
ldr r10, =(Pico+0x10000) @ r10=Pico.vram
|
|
mov r8, r0 @ hc
|
|
mov r0, #0xf
|
|
|
|
@ scratch: r4, r7
|
|
@ *hcache++ = code|(dx<<16)|(trow<<27); // cache it
|
|
|
|
.dtfcf_loop:
|
|
ldr r7, [r8], #4 @ read code
|
|
movs r1, r7, lsr #16 @ r1=dx;
|
|
ldmeqfd sp!, {r4-r10,pc} @ dx is never zero, this must be a terminator, return
|
|
|
|
@ row changed?
|
|
cmp r6, r7, lsr #27
|
|
movne r6, r7, lsr #27
|
|
movne r4, #328*8
|
|
mlane r5, r4, r6, r12 @ r5=pd = scrpos + prevy*328*8
|
|
|
|
bic r1, r1, #0xf800
|
|
add r1, r5, r1 @ r1=pdest (halfwords)
|
|
|
|
mov r7, r7, lsl #16
|
|
mov r7, r7, lsr #16
|
|
|
|
cmp r7, r9, lsr #8
|
|
bne .dtfcf_notsamecode
|
|
@ we know stuff about this tile already
|
|
tst r9, #1
|
|
bne .dtfcf_loop @ empty tile
|
|
tst r9, #2
|
|
bne .dtfcf_singlecolor @ singlecolor tile
|
|
b .dtfcf_samecode
|
|
|
|
.dtfcf_notsamecode:
|
|
and r4, r9, #0x600000
|
|
mov r9, r7, lsl #8 @ remember new code
|
|
|
|
@ update cram val
|
|
and r7, r7, #0x6000
|
|
mov r3, r7, asr #9 @ r3=pal=((code&0x6000)>>9);
|
|
|
|
|
|
.dtfcf_samecode:
|
|
|
|
tst r9, #0x100000 @ vflip?
|
|
bne .dtfcf_vflip
|
|
|
|
tst r9, #0x080000 @ hflip?
|
|
bne .dtfcf_hflip
|
|
|
|
@ Tile (r1=pdest, r3=pal, r9=prevcode, r10=Pico.vram) r2,r4,r7: scratch, r0=0xf
|
|
Tile 0, 0
|
|
b .dtfcf_loop
|
|
|
|
.dtfcf_hflip:
|
|
Tile 1, 0
|
|
b .dtfcf_loop
|
|
|
|
.dtfcf_vflip:
|
|
tst r9, #0x080000 @ hflip?
|
|
bne .dtfcf_vflip_hflip
|
|
|
|
Tile 0, 1
|
|
b .dtfcf_loop
|
|
|
|
.dtfcf_vflip_hflip:
|
|
Tile 1, 1
|
|
b .dtfcf_loop
|
|
|
|
.dtfcf_singlecolor:
|
|
TileSinglecol
|
|
b .dtfcf_loop
|
|
|
|
.pool
|
|
|
|
|
|
@ @@@@@@@@@@@@@@@
|
|
|
|
@ (tile_start<<16)|row_start
|
|
.global DrawWindowFull @ int tstart, int tend, int prio
|
|
|
|
DrawWindowFull:
|
|
stmfd sp!, {r4-r11,lr}
|
|
|
|
ldr r11, =(Pico+0x22228) @ Pico.video
|
|
ldrb r12, [r11, #3] @ pvid->reg[3]
|
|
mov r12, r12, lsl #10
|
|
|
|
ldr r4, [r11, #12]
|
|
mov r5, #1 @ nametab_step
|
|
tst r4, #1 @ 40 cell mode?
|
|
andne r12, r12, #0xf000 @ 0x3c<<10
|
|
andeq r12, r12, #0xf800
|
|
movne r5, r5, lsl #7
|
|
moveq r5, r5, lsl #6 @ nametab_step
|
|
|
|
and r4, r0, #0xff
|
|
mla r12, r5, r4, r12 @ nametab += nametab_step*start;
|
|
|
|
mov r4, r0, lsr #16 @ r4=start_cell_h
|
|
add r7, r12, r4, lsl #1
|
|
|
|
@ fetch the first code now
|
|
ldr r10, =(Pico+0x10000) @ lr=Pico.vram
|
|
ldrh r7, [r10, r7]
|
|
cmp r2, r7, lsr #15
|
|
ldmnefd sp!, {r4-r11,pc} @ hack: simply assume that whole window uses same priority
|
|
|
|
rsb r8, r4, r1, lsr #16 @ cells (h)
|
|
orr r8, r8, r4, lsl #8
|
|
mov r4, r1, lsl #24
|
|
sub r4, r4, r0, lsl #24
|
|
orr r8, r8, r4, lsr #8 @ r8=cells_h|(start_cell_h<<8)|(cells_v<<16)
|
|
sub r8, r8, #0x010000 @ adjust for algo
|
|
|
|
mov r9, #0xff000000 @ r9=prevcode=-1
|
|
|
|
ldr r11, =PicoDraw2FB @ r11=scrpos
|
|
and r4, r0, #0xff
|
|
ldr r11, [r11]
|
|
sub r4, r4, #START_ROW
|
|
add r11, r11, #328*8
|
|
add r11, r11, #8
|
|
|
|
mov r7, #328*8
|
|
mla r11, r7, r4, r11 @ scrpos+=8*328*(start-START_ROW);
|
|
mov r0, #0xf
|
|
|
|
.dwfloop_outer:
|
|
and r6, r8, #0xff00 @ r6=tilex
|
|
add r1, r11, r6, lsr #5 @ r1=pdest
|
|
add r6, r12, r6, lsr #7
|
|
add r6, r10, r6 @ r6=Pico.vram+nametab+tilex
|
|
orr r8, r8, r8, lsl #24
|
|
sub r8, r8, #0x01000000 @ cell loop counter
|
|
b .dwfloop_enter
|
|
|
|
@ r4 & r7 are scratch in this loop
|
|
.dwfloop:
|
|
add r1, r1, #8
|
|
subs r8, r8, #0x01000000
|
|
bmi .dwfloop_exit
|
|
|
|
.dwfloop_enter:
|
|
ldrh r7, [r6], #2 @ r7=code
|
|
|
|
cmp r7, r9, lsr #8
|
|
bne .dwf_notsamecode
|
|
@ we know stuff about this tile already
|
|
tst r9, #1
|
|
bne .dwfloop @ empty tile
|
|
tst r9, #2
|
|
bne .dwf_singlecolor @ singlecolor tile
|
|
b .dwf_samecode
|
|
|
|
.dwf_notsamecode:
|
|
and r4, r9, #0x600000
|
|
mov r9, r7, lsl #8 @ remember new code
|
|
|
|
@ update cram val
|
|
and r7, r7, #0x6000
|
|
mov r3, r7, asr #9 @ r3=pal=((code&0x6000)>>9);
|
|
|
|
.dwf_samecode:
|
|
|
|
tst r9, #0x100000 @ vflip?
|
|
bne .dwf_vflip
|
|
|
|
tst r9, #0x080000 @ hflip?
|
|
bne .dwf_hflip
|
|
|
|
@ Tile (r1=pdest, r3=pal, r9=prevcode, r10=Pico.vram) r2,r4,r7: scratch, r0=0xf
|
|
Tile 0, 0
|
|
b .dwfloop
|
|
|
|
.dwf_hflip:
|
|
Tile 1, 0
|
|
b .dwfloop
|
|
|
|
.dwf_vflip:
|
|
tst r9, #0x080000 @ hflip?
|
|
bne .dwf_vflip_hflip
|
|
|
|
Tile 0, 1
|
|
b .dwfloop
|
|
|
|
.dwf_vflip_hflip:
|
|
Tile 1, 1
|
|
b .dwfloop
|
|
|
|
.dwf_singlecolor:
|
|
TileSinglecol 1
|
|
b .dwfloop
|
|
|
|
.dwfloop_exit:
|
|
bic r8, r8, #0xff000000 @ fix r8
|
|
subs r8, r8, #0x010000
|
|
ldmmifd sp!, {r4-r11,pc}
|
|
add r11, r11, #328*8
|
|
add r12, r12, r5 @ nametab+=nametab_step
|
|
b .dwfloop_outer
|
|
|
|
.pool
|
|
|
|
|
|
@ ---------------- sprites ---------------
|
|
|
|
.macro SpriteLoop hflip vflip
|
|
.if \vflip
|
|
mov r1, r5, lsr #24 @ height
|
|
mov r0, #328*8
|
|
mla r11, r1, r0, r11 @ scrpos+=height*328*8;
|
|
add r12, r12, r1, lsl #3 @ sy+=height*8
|
|
.endif
|
|
mov r0, #0xf
|
|
.if \hflip
|
|
and r1, r5, #0xff
|
|
add r8, r8, r1, lsl #3 @ sx+=width*8
|
|
58:
|
|
cmp r8, #336
|
|
blt 51f
|
|
add r9, r9, r5, lsr #16
|
|
sub r5, r5, #1 @ sub width
|
|
sub r8, r8, #8
|
|
b 58b
|
|
.else
|
|
cmp r8, #0 @ skip tiles hidden on the left of screen
|
|
bgt 51f
|
|
58:
|
|
add r9, r9, r5, lsr #16
|
|
sub r5, r5, #1
|
|
adds r8, r8, #8
|
|
ble 58b
|
|
b 51f
|
|
.endif
|
|
|
|
50: @ outer
|
|
.if !\hflip
|
|
add r8, r8, #8 @ sx+=8
|
|
.endif
|
|
bic r5, r5, #0xff000000 @ fix height
|
|
orr r5, r5, r5, lsl #16
|
|
|
|
51: @ outer_enter
|
|
sub r5, r5, #1 @ width--
|
|
movs r1, r5, lsl #24
|
|
ldmmifd sp!, {r4-r11,pc} @ end of tile
|
|
.if \hflip
|
|
subs r8, r8, #8 @ sx-=8
|
|
ldmlefd sp!, {r4-r11,pc} @ tile offscreen
|
|
.else
|
|
cmp r8, #328
|
|
ldmgefd sp!, {r4-r11,pc} @ tile offscreen
|
|
.endif
|
|
mov r6, r12 @ r6=sy
|
|
add r1, r11, r8 @ pdest=scrpos+sx
|
|
b 53f
|
|
|
|
52: @ inner
|
|
add r9, r9, #1<<8 @ tile++
|
|
.if !\vflip
|
|
add r6, r6, #8 @ sy+=8
|
|
add r1, r1, #328*8
|
|
.endif
|
|
|
|
53: @ inner_enter
|
|
@ end of sprite?
|
|
subs r5, r5, #0x01000000
|
|
bmi 50b @ ->outer
|
|
.if \vflip
|
|
sub r6, r6, #8 @ sy-=8
|
|
sub r1, r1, #328*8
|
|
.endif
|
|
|
|
@ offscreen?
|
|
cmp r6, #(START_ROW*8)
|
|
ble 52b
|
|
|
|
cmp r6, #(END_ROW*8+8)
|
|
bge 52b
|
|
|
|
@ Tile (r1=pdest, r3=pal, r9=prevcode, r10=Pico.vram) r2,r4,r7: scratch, r0=0xf
|
|
Tile \hflip, \vflip
|
|
b 52b
|
|
.endm
|
|
|
|
|
|
.global DrawSpriteFull @ unsigned int *sprite
|
|
|
|
DrawSpriteFull:
|
|
stmfd sp!, {r4-r11,lr}
|
|
|
|
ldr r3, [r0] @ sprite[0]
|
|
mov r5, r3, lsl #4
|
|
mov r6, r5, lsr #30
|
|
add r6, r6, #1 @ r6=width
|
|
mov r5, r5, lsl #2
|
|
mov r5, r5, lsr #30
|
|
add r5, r5, #1 @ r5=height
|
|
|
|
mov r12, r3, lsl #23
|
|
mov r12, r12, lsr #23
|
|
|
|
ldr lr, [r0, #4] @ lr=code
|
|
sub r12, r12, #0x78 @ r12=sy
|
|
mov r8, lr, lsl #7
|
|
mov r8, r8, lsr #23
|
|
sub r8, r8, #0x78 @ r8=sx
|
|
|
|
mov r9, lr, lsl #21
|
|
mov r9, r9, lsr #13 @ r9=tile<<8
|
|
|
|
and r3, lr, #0x6000
|
|
mov r3, r3, lsr #9 @ r3=pal=((code>>9)&0x30);
|
|
|
|
ldr r11, =PicoDraw2FB @ r11=scrpos
|
|
ldr r10, =(Pico+0x10000) @ r10=Pico.vram
|
|
ldr r11, [r11]
|
|
sub r1, r12, #(START_ROW*8)
|
|
mov r0, #328
|
|
mla r11, r1, r0, r11 @ scrpos+=(sy-START_ROW*8)*328;
|
|
|
|
orr r5, r5, r5, lsl #16 @
|
|
orr r5, r6, r5, lsl #8 @ r5=width|(height<<8)|(height<<24)
|
|
|
|
tst lr, #0x1000 @ vflip?
|
|
bne .dsf_vflip
|
|
|
|
tst lr, #0x0800 @ hflip?
|
|
bne .dsf_hflip
|
|
|
|
SpriteLoop 0, 0
|
|
|
|
.dsf_hflip:
|
|
SpriteLoop 1, 0
|
|
|
|
.dsf_vflip:
|
|
tst lr, #0x0800 @ hflip?
|
|
bne .dsf_vflip_hflip
|
|
|
|
SpriteLoop 0, 1
|
|
|
|
.dsf_vflip_hflip:
|
|
SpriteLoop 1, 1
|
|
|
|
.pool
|
|
|
|
@ vim:filetype=armasm
|