fox32rom: Move text drawing to a generic routine
Instead of having lots of duplicate code for drawing text to overlays and the background, move all of the actual drawing logic to a generic routine that can be used to draw text to *any* type of framebuffer.
This commit is contained in:
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62281cf98c
commit
5f5771e823
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@ -81,67 +81,27 @@ draw_filled_rectangle_to_background_x_loop:
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; outputs:
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; none
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draw_font_tile_to_background:
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push r0
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push r1
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push r2
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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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;movz.8 r0, r0 ; ensure the tile number is a single byte
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; calculate pointer to the tile data
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push r1
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push r2
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mov r1, 8 ; tile width
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mov r2, 16 ; tile height
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mul r1, r2
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mul r0, r1
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mul r0, 4 ; 4 bytes per pixel
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add r0, font ; r0: pointer to tile data
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pop r2
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pop r1
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; calculate pointer to the framebuffer
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mul r2, 2560 ; y * 2560 (640 * 4 = 2560)
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mul r1, 4 ; x * 4
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add r1, r2 ; y * 2560 + (x * 4)
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add r1, BACKGROUND_FRAMEBUFFER ; r1: pointer to framebuffer
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mov r6, 16 ; y counter
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draw_font_tile_to_background_y_loop:
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mov r5, 8 ; x counter
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draw_font_tile_to_background_x_loop:
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mov r2, [r0]
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cmp r2, 0xFF000000
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ifz jmp draw_font_tile_to_background_x_loop_background
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; drawing foreground pixel
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cmp r3, 0x00000000 ; is the foreground color supposed to be transparent?
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ifz jmp draw_font_tile_to_background_x_loop_end
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mov [r1], r3 ; draw foreground color
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jmp draw_font_tile_to_background_x_loop_end
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draw_font_tile_to_background_x_loop_background:
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; drawing background pixel
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cmp r4, 0x00000000 ; is the background color supposed to be transparent?
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ifz jmp draw_font_tile_to_background_x_loop_end
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mov [r1], r4 ; draw background color
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draw_font_tile_to_background_x_loop_end:
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add r0, 4 ; increment tile pointer
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add r1, 4 ; increment framebuffer pointer
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dec r5
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ifnz jmp draw_font_tile_to_background_x_loop ; loop if there are still more X pixels to draw
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sub r1, 32 ; 8*4, return to the beginning of this line
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add r1, 2560 ; 640*4, increment to the next line
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dec r6
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ifnz jmp draw_font_tile_to_background_y_loop ; loop if there are still more Y pixels to draw
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mov r5, standard_font_data
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movz.16 r6, [standard_font_width]
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movz.16 r7, [standard_font_height]
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mov r8, BACKGROUND_FRAMEBUFFER
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mov r9, 640
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call draw_font_tile_generic
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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 r2
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pop r1
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pop r0
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ret
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; draw text on the background
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; draw text to the background
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; inputs:
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; r0: pointer to null-terminated string
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; r1: X coordinate
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111
draw_text.asm
Normal file
111
draw_text.asm
Normal file
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@ -0,0 +1,111 @@
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; generic text drawing routines
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; draw a single font tile to a framebuffer
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; inputs:
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; r0: tile number
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; r1: X coordinate
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; r2: Y coordinate
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; r3: foreground color
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; r4: background color
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; r5: pointer to font graphics
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; r6: font width
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; r7: font height
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; r8: pointer to framebuffer
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; r9: framebuffer width (pixels)
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; outputs:
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; none
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draw_font_tile_generic:
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push r0
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push r1
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push r2
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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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;movz.8 r0, r0 ; ensure the tile number is a single byte
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; calculate pointer to the tile data
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push r6
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mul r6, r7
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mul r0, r6
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mul r0, 4 ; 4 bytes per pixel
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add r0, r5 ; r0: pointer to tile data
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pop r6
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; calculate pointer to the framebuffer
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mul r9, 4 ; 4 bytes per pixel
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mul r2, r9 ; y * width * 4
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mul r1, 4 ; x * 4
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add r1, r2 ; y * width * 4 + (x * 4)
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add r1, r8 ; r1: pointer to framebuffer
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; r8: font width in bytes
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mov r8, r6
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mul r8, 4
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draw_font_tile_generic_y_loop:
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mov r5, r6 ; x counter
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draw_font_tile_generic_x_loop:
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mov r2, [r0]
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cmp r2, 0xFF000000
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ifz jmp draw_font_tile_generic_x_loop_background
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; drawing foreground pixel
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cmp r3, 0x00000000 ; is the foreground color supposed to be transparent?
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ifz jmp draw_font_tile_generic_x_loop_end
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mov [r1], r3 ; draw foreground color
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jmp draw_font_tile_generic_x_loop_end
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draw_font_tile_generic_x_loop_background:
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; drawing background pixel
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cmp r4, 0x00000000 ; is the background color supposed to be transparent?
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ifz jmp draw_font_tile_generic_x_loop_end
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mov [r1], r4 ; draw background color
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draw_font_tile_generic_x_loop_end:
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add r0, 4 ; increment tile pointer
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add r1, 4 ; increment framebuffer pointer
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dec r5
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ifnz jmp draw_font_tile_generic_x_loop ; loop if there are still more X pixels to draw
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sub r1, r8 ; return to the beginning of this line
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add r1, r9 ; increment to the next line by adding the framebuffer width in bytes
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dec r7 ; decrement height counter
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ifnz jmp draw_font_tile_generic_y_loop ; loop if there are still more Y pixels to draw
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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 r2
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pop r1
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pop r0
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ret
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; draw text to a framebuffer
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; inputs:
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; r0: pointer to null-terminated string
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; r1: X coordinate
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; r2: Y coordinate
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; r3: foreground color
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; r4: background color
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; r5: pointer to font graphics
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; r6: font width
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; r7: font height
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; r8: pointer to framebuffer
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; r9: framebuffer width
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; outputs:
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; r1: X coordinate of end of text
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draw_str_generic:
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push r0
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push r10
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mov r10, r0
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draw_str_generic_loop:
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movz.8 r0, [r10]
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call draw_font_tile_generic
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inc r10
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add r1, r6
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cmp.8 [r10], 0x00
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ifnz jmp draw_str_generic_loop
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pop r10
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pop r0
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ret
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32
fox32rom.def
32
fox32rom.def
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@ -8,25 +8,29 @@ new_event: jmp [0xF004000C]
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wait_for_event: jmp [0xF0040010]
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get_next_event: jmp [0xF0040014]
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; generic text drawing jump table
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draw_str_generic: jmp [0xF0041000]
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draw_font_tile_generic: jmp [0xF0041004]
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; background jump table entries
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draw_str_to_background: jmp [0xF0041000]
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draw_font_tile_to_background: jmp [0xF0041004]
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fill_background: jmp [0xF0041008]
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fill_background: jmp [0xF0042000]
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draw_str_to_background: jmp [0xF0042004]
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draw_font_tile_to_background: jmp [0xF0042008]
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; overlay jump table entries
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draw_str_to_overlay: jmp [0xF0042000]
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draw_font_tile_to_overlay: jmp [0xF0042004]
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fill_overlay: jmp [0xF0042008]
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find_overlay_covering_position: jmp [0xF004200C]
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check_if_overlay_covers_position: jmp [0xF0042010]
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check_if_enabled_overlay_covers_position: jmp [0xF0042014]
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fill_overlay: jmp [0xF0043000]
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draw_str_to_overlay: jmp [0xF0043004]
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draw_font_tile_to_overlay: jmp [0xF0043008]
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find_overlay_covering_position: jmp [0xF004300C]
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check_if_overlay_covers_position: jmp [0xF0043010]
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check_if_enabled_overlay_covers_position: jmp [0xF0043014]
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; menu bar jump table entries
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menu_bar_click_event: jmp [0xF0043000]
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clear_menu_bar: jmp [0xF0043004]
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draw_menu_bar_root_items: jmp [0xF0043008]
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draw_submenu_items: jmp [0xF004300C]
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close_submenu: jmp [0xF0043010]
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menu_bar_click_event: jmp [0xF0044000]
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clear_menu_bar: jmp [0xF0044004]
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draw_menu_bar_root_items: jmp [0xF0044008]
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draw_submenu_items: jmp [0xF004400C]
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close_submenu: jmp [0xF0044010]
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; event types
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const MOUSE_CLICK_EVENT_TYPE: 0x00000000
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22
main.asm
22
main.asm
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@ -173,6 +173,7 @@ get_rom_version:
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#include "background.asm"
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#include "boot.asm"
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#include "debug.asm"
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#include "draw_text.asm"
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#include "event.asm"
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#include "memory.asm"
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#include "menu.asm"
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@ -196,23 +197,28 @@ get_rom_version:
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data.32 wait_for_event
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data.32 get_next_event
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; background jump table
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; generic text drawing jump table
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org.pad 0xF0041000
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data.32 draw_str_generic
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data.32 draw_font_tile_generic
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; background jump table
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org.pad 0xF0042000
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data.32 fill_background
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data.32 draw_str_to_background
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data.32 draw_font_tile_to_background
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data.32 fill_background
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; overlay jump table
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org.pad 0xF0042000
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org.pad 0xF0043000
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data.32 fill_overlay
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data.32 draw_str_to_overlay
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data.32 draw_font_tile_to_overlay
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data.32 fill_overlay
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data.32 find_overlay_covering_position
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data.32 check_if_overlay_covers_position
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data.32 check_if_enabled_overlay_covers_position
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; menu bar jump table
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org.pad 0xF0043000
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org.pad 0xF0044000
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data.32 menu_bar_click_event
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data.32 clear_menu_bar
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data.32 draw_menu_bar_root_items
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@ -220,7 +226,11 @@ get_rom_version:
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data.32 close_submenu
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org.pad 0xF004F000
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font:
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standard_font_width:
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data.16 8
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standard_font_height:
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data.16 16
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standard_font_data:
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#include_bin "font/unifont-thin.raw"
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mouse_cursor:
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75
overlay.asm
75
overlay.asm
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@ -103,77 +103,32 @@ draw_filled_rectangle_to_overlay_x_loop:
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; outputs:
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; none
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draw_font_tile_to_overlay:
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push r0
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push r1
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push r2
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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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;movz.8 r0, r0 ; ensure the tile number is a single byte
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; calculate pointer to the tile data
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push r1
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push r2
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mov r1, 8 ; tile width
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mov r2, 16 ; tile height
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mul r1, r2
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mul r0, r1
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mul r0, 4 ; 4 bytes per pixel
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add r0, font ; r0: pointer to tile data
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pop r2
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pop r1
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; calculate pointer to the framebuffer
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mov r7, r5 ; r7: overlay number
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or r7, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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in r6, r7
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and r6, 0x0000FFFF ; mask off the height, we only need the width
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mul r6, 4 ; 4 bytes per pixel
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mov r7, r6 ; r7: overlay width in bytes (width * 4)
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mul r2, r7 ; y * width * 4
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mul r1, 4 ; x * 4
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add r1, r2 ; y * width * 4 + (x * 4)
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mov r6, r5
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or r6, 0x80000100 ; bitwise or the overlay number with the command to get the overlay size
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or r5, 0x80000200 ; bitwise or the overlay number with the command to get the framebuffer pointer
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in r6, r5
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add r1, r6 ; r1: pointer to framebuffer
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in r8, r5 ; r8: overlay framebuffer poiner
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in r9, r6
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and r9, 0x0000FFFF ; r9: overlay width
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mov r6, 16 ; y counter
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draw_font_tile_to_overlay_y_loop:
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mov r5, 8 ; x counter
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draw_font_tile_to_overlay_x_loop:
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mov r2, [r0]
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cmp r2, 0xFF000000
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ifz jmp draw_font_tile_to_overlay_x_loop_background
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; drawing foreground pixel
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cmp r3, 0x00000000 ; is the foreground color supposed to be transparent?
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ifz jmp draw_font_tile_to_overlay_x_loop_end
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mov [r1], r3 ; draw foreground color
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jmp draw_font_tile_to_overlay_x_loop_end
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draw_font_tile_to_overlay_x_loop_background:
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; drawing background pixel
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cmp r4, 0x00000000 ; is the background color supposed to be transparent?
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ifz jmp draw_font_tile_to_overlay_x_loop_end
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mov [r1], r4 ; draw background color
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draw_font_tile_to_overlay_x_loop_end:
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add r0, 4 ; increment tile pointer
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add r1, 4 ; increment framebuffer pointer
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dec r5
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ifnz jmp draw_font_tile_to_overlay_x_loop ; loop if there are still more X pixels to draw
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sub r1, 32 ; 8*4, return to the beginning of this line
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add r1, r7 ; increment to the next line by adding the overlay width in bytes
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dec r6
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ifnz jmp draw_font_tile_to_overlay_y_loop ; loop if there are still more Y pixels to draw
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mov r5, standard_font_data
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movz.16 r6, [standard_font_width]
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movz.16 r7, [standard_font_height]
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call draw_font_tile_generic
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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 r2
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pop r1
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pop r0
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ret
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; draw text on an overlay
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; draw text to an overlay
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; inputs:
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; r0: pointer to null-terminated string
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; r1: X coordinate
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@ -354,4 +309,4 @@ make_coordinates_relative_to_overlay:
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pop r3
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pop r2
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ret
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ret
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