create repository with functional basic implementation
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299
src/lib/drawing.asm
Normal file
299
src/lib/drawing.asm
Normal file
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include ../consts/offsets
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include ../consts/map
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include ../consts/screen
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include ../consts/scene
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include ../consts/sprites
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include sprite_rotation
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; /* Draw the whole (fill the screen memory with the values of the sprites based on the map)
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; Inputs:
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; Outputs:
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; Locals:
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; r1: x map coord
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; r2: y map coord
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; r3: sprite rotation
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; r4: sprite id
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; r12: rotation (returned by `sprite and rotation`)
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; r13: sprite (returned by `get_sprite_id_and_rotation`)
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; */
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pub drawing.draw_whole_map:
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push r1
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push r2
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push r3
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push r4
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push r12
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push r13
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mov r1, 0
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mov r2, 0
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draw_whole_map_loop:
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call sprite_rotation.get_sprite_id_and_rotation
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mov r3, r12
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mov r4, r13
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call drawing.draw_sprite_at_map_coord
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add r1, r1, 1
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cmp r1, map.width
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jne draw_whole_map_loop
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mov r1, 0
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add r2, r2, 1
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cmp r2, map.height
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jne draw_whole_map_loop
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pop r13
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pop r12
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pop r4
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pop r3
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pop r2
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pop r1
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ret
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; /* Return the top-left pixel address of the tile at the given map coordinates
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; Inputs:
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; r1: map x coord
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; r2: map y coord
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; Locals:
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; r3: counter
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; r4: offset per tile row (screen width * tile height)
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; Ouputs:
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; r13: the pixel address
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; */
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get_tile_address:
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push r3
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push r4
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mov r3, 0
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mov r4, 0
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get_tile_address_offset_per_row_loop:
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add r4, r4, screen.width
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add r3, r3, 1
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cmp r3, sprites.height
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jne get_tile_address_offset_per_row_loop
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mov r13, offsets.screen
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mov r3, 0
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get_tile_address_margin_top_loop:
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cmp r3, scene.margin_top
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je get_tile_address_margin_top_loop_end
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add r13, r13, screen.width
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add r3, r3, 1
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jmp get_tile_address_margin_top_loop
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get_tile_address_margin_top_loop_end:
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mov r3, 0
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get_tile_address_tile_row_loop:
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cmp r3, r2
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je get_tile_address_tile_row_loop_end
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add r13, r13, r4
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add r3, r3, 1
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jmp get_tile_address_tile_row_loop
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get_tile_address_tile_row_loop_end:
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add r13, r13, scene.margin_left
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mov r3, 0
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get_tile_address_tile_column_loop:
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cmp r3, r1
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je get_tile_address_tile_column_loop_end
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add r13, r13, sprites.width
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add r3, r3, 1
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jmp get_tile_address_tile_column_loop
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get_tile_address_tile_column_loop_end:
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pop r4
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pop r3
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ret
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; /* Get address of given sprite id
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; Inputs:
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; r1: sprite id
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; Outputs:
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; r13: address
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; Locals:
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; r2: jump address
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; */
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get_sprite_address:
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push r1
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push r2
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cmp r1, sprites.max
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jbe get_sprite_address_jmp_table_init
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mov r1, sprites.unimplemented
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get_sprite_address_jmp_table_init:
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lsl r2, r1, 3 ; 2*instruction_size = *8 = <<3
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add r2, r2, get_sprite_address_jmp_table_start
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jmp r2
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get_sprite_address_jmp_table_start:
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; sprite_empty
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add r13, zr, sprite_empty
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jmp get_sprite_address_return
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; sprite_unimplemented:
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add r13, zr, sprite_unimplemented
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jmp get_sprite_address_return
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; sprite_wall_end
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add r13, zr, sprite_wall_end
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jmp get_sprite_address_return
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; sprite_wall_straight
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add r13, zr, sprite_wall_straight
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jmp get_sprite_address_return
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; sprite_wall_corner
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add r13, zr, sprite_wall_corner
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jmp get_sprite_address_return
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; sprite_robot
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add r13, zr, sprite_robot
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jmp get_sprite_address_return
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; sprite_ghost
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add r13, zr, sprite_ghost
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jmp get_sprite_address_return
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; sprite_coin:
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add r13, zr, sprite_coin
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;jmp get_sprite_address_return
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get_sprite_address_return:
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pop r2
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pop r1
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ret
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; /* Draw given sprite on the screen at given map coordinates
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; Inputs:
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; r1: map x coord
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; r2: map y coord
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; r3: sprite rotation
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; r4: sprite id
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; Outputs:
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; Locals:
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; r1: screen address
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; r2: sprite address
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; r13: value returned by call to `get_tile_address` and `get_sprite_address`
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; */
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pub drawing.draw_sprite_at_map_coord:
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push r1
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push r2
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push r3
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push r4
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push r13
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call get_tile_address
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mov r1, r13
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push r1
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mov r1, r4
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call get_sprite_address
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mov r2, r13
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pop r1
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call draw_sprite
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pop r13
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pop r4
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pop r3
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pop r2
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pop r1
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ret
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; /* Draw given sprite (by address) at given screen position (by address) with given rotation
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; Inputs:
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; r1: screen address
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; r2: sprite address
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; r3: rotation
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; Outputs:
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; Locals:
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; r1: current screen pixel address
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; r4: x
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; r5: y
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; r6: current sprite pixel address
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; r7: color
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; r8: x increment
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; r9: y increment
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; */
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draw_sprite:
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push r1
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push r2
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push r3
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push r4
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push r5
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push r6
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push r7
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push r8
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push r9
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mov r6, r2
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; rotation
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draw_sprite_cmp_rotation_0:
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cmp r3, sprites.rotation_0
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jne draw_sprite_cmp_rotation_90
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mov r8, 1
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mov r9, 0
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jmp draw_sprite_loop_init
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draw_sprite_cmp_rotation_90:
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cmp r3, sprites.rotation_90
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jne draw_sprite_cmp_rotation_180
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add r6, r6, sprites.size
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sub r6, r6, sprites.width
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sub r8, zr, sprites.width
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mov r9, sprites.size
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add r9, r9, 1
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jmp draw_sprite_loop_init
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draw_sprite_cmp_rotation_180:
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cmp r3, sprites.rotation_180
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jne draw_sprite_cmp_rotation_270
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add r6, r6, sprites.size
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sub r6, r6, 1
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sub r8, zr, 1
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mov r9, 0
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jmp draw_sprite_loop_init
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draw_sprite_cmp_rotation_270:
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add r6, r6, sprites.width
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sub r6, r6, 1
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mov r8, sprites.width
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sub r9, zr, sprites.size
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sub r9, r9, 1
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draw_sprite_loop_init:
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mov r4, 0
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mov r5, 0
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draw_sprite_loop:
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load_8 r7, [r6]
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store_8 [r1], r7
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add r4, r4, 1
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add r1, r1, 1
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add r6, r6, r8
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cmp r4, sprites.width
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jne draw_sprite_loop
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mov r4, 0
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add r6, r6, r9
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add r1, r1, screen.width
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sub r1, r1, sprites.width
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add r5, r5, 1
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cmp r5, sprites.width
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jne draw_sprite_loop
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pop r9
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pop r8
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pop r7
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pop r6
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pop r5
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pop r4
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pop r3
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pop r2
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pop r1
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ret
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