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62 lines
1.5 KiB
NASM
62 lines
1.5 KiB
NASM
; draw_box.asm -- one-shot static VRAM injection, then return.
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;
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; Draws three 32x32 solid-white boxes at framebuffer (x,y):
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; A (50,50) -- root weave, outside every window
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; B (250,400) -- inside the Terminal Manager window body (white area)
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; C (930,750) -- root weave, lower right
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; Writes marker words and returns with `rets`, so the rdebug session survives.
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;
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; Framebuffer model (harness/mame/RENDER_REPORT.md): base bit 04000000h,
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; 1024 bits per row, bit 0 = leftmost pixel, LSB-first in each 16-bit word.
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;
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; Linked at bit 01840000h by dwt/visual/build.sh.
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.text
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_start:
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setf 16, 0, 0
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setf 32, 0, 1
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movi 0FFFFh, a0, L ; pattern
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; ---- box A: (50,50), 32 rows x 2 words = 32x32 px -------------
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movi 0400C832h, a2, L ; 04000000h + 50*1024 + 50
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movi 32, a3, L
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movi 2, a4, L
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rowA:
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move a4, a5
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wordA:
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move a0, *a2+, 0
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dsjs a5, wordA
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addi 03E0h, a2 ; 1024 - 32 bits
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dsjs a3, rowA
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; ---- box B: (250,400) ----------------------------------------
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movi 040640FAh, a2, L ; 04000000h + 400*1024 + 250
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movi 32, a3, L
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movi 2, a4, L
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rowB:
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move a4, a5
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wordB:
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move a0, *a2+, 0
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dsjs a5, wordB
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addi 03E0h, a2
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dsjs a3, rowB
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; ---- box C: (930,750) ----------------------------------------
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movi 040BBBA2h, a2, L ; 04000000h + 750*1024 + 930
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movi 32, a3, L
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movi 2, a4, L
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rowC:
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move a4, a5
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wordC:
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move a0, *a2+, 0
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dsjs a5, wordC
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addi 03E0h, a2
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dsjs a3, rowC
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movi 0D2A0h, a0, L
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move a0, @01850020h, 0 ; DRAW_MARK = D2A0
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movi 0B0C0h, a0, L
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move a0, @01850030h, 0 ; DRAW_MARK2 = B0C0
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rets
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.end
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