zxq5
adfba876d2
- setup new UI layout using tiling and an action/message based system for updating global state based on interactions with individual tiles and vice versa - added custom dialogs and UI helpers to create a more cohesive UI - added a disassembler widget (WIP) - added a documentation widget (WIP) - refactored backend halt/pause logic to fix bugs. - started emulator implementation documentation (to complement the ISA spec)
162 lines
2.7 KiB
Plaintext
162 lines
2.7 KiB
Plaintext
dw DISPLAY: 0x30000
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dw stack: 0x10000
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// colour table — AABBGGRR format
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dw COL0: 0xFFFFFFFF // white
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dw COL1: 0xFF0000FF // red
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dw COL2: 0xFF00FF00 // green
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dw COL3: 0xFFFF0000 // blue
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dw COL4: 0xFF00FFFF // yellow
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dw COL_IDX: 0
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// registers:
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// rg0 = x position
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// rg1 = y position
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// rg2 = x direction (1 = right, 0 = left)
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// rg3 = y direction (1 = down, 0 = up)
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// rg5 = current colour
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_init:
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ldw stack, bpr
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mov bpr, spr
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start:
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lli 0, rg0
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lli 0, rg1
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lli 1, rg2
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lli 1, rg3
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lli 0, rg8
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stw rg8, COL_IDX
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ldw COL0, rg5
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frame_loop:
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// --- clear display ---
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ldw DISPLAY, rg4
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lwi 76800, rga
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clear_loop:
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stw zero, rg4
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addi rg4, 4, rg4
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subi rga, 1, rga
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jnz rga, clear_loop
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// --- draw square ---
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mov rg1, rg6
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draw_y_loop:
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lli 20, rg8
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add rg1, rg8, rg8
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ilt rg6, rg8, rg9
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jez rg9, draw_done
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mov rg0, rg7
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draw_x_loop:
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lli 20, rg8
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add rg0, rg8, rg8
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ilt rg7, rg8, rg9
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jez rg9, draw_x_done
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shl rg6, 8, rg8
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shl rg6, 6, rg9
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add rg8, rg9, rg8
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add rg8, rg7, rg8
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shl rg8, 2, rg8
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ldw DISPLAY, rg9
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add rg9, rg8, rg8
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stw rg5, rg8
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addi rg7, 1, rg7
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jmp draw_x_loop
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draw_x_done:
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addi rg6, 1, rg6
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jmp draw_y_loop
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draw_done:
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// --- track bounces this frame ---
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lli 0, rgb
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lli 0, rgc
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// --- check x walls ---
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lli 1, rg8
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ieq rg2, rg8, rg9
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jez rg9, check_x_left_wall
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check_x_right_wall:
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lli 300, rg8
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ige rg0, rg8, rg9
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jez rg9, move_x
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lli 0, rg2
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lli 1, rgb
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jmp move_x
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check_x_left_wall:
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ieq rg0, zero, rg9
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jez rg9, move_x
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lli 1, rg2
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lli 1, rgb
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move_x:
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lli 1, rg8
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ieq rg2, rg8, rg9
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jez rg9, do_x_left
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addi rg0, 1, rg0
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jmp check_y_walls
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do_x_left:
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subi rg0, 1, rg0
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check_y_walls:
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lli 1, rg8
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ieq rg3, rg8, rg9
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jez rg9, check_y_up_wall
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check_y_down_wall:
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lli 220, rg8
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ige rg1, rg8, rg9
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jez rg9, move_y
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lli 0, rg3
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lli 1, rgc
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jmp move_y
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check_y_up_wall:
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ieq rg1, zero, rg9
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jez rg9, move_y
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lli 1, rg3
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lli 1, rgc
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move_y:
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lli 1, rg8
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ieq rg3, rg8, rg9
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jez rg9, do_y_up
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addi rg1, 1, rg1
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jmp check_corner
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do_y_up:
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subi rg1, 1, rg1
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check_corner:
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and rgb, rgc, rg8
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jez rg8, delay
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// advance colour index
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ldw COL_IDX, rg8
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addi rg8, 1, rg8
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lli 5, rg9
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ige rg8, rg9, rg9
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jez rg9, store_col_idx
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lli 0, rg8
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store_col_idx:
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stw rg8, COL_IDX
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// load colour from table: address = COL0 + idx * 4
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shl rg8, 2, rg8
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lwi COL0, rg9
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add rg9, rg8, rg8
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ldw rg8, rg5
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delay:
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lwi 2000000, rg8
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delay_loop:
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subi rg8, 1, rg8
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jnz rg8, delay_loop
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jmp frame_loop
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hlt |