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Merge pull request #2448 from Commodore64128/master
Commander X16 640x480 tgi loadable graphics driver
This commit is contained in:
Bob Andrews
GitHub
commit
1d1dd425c1
@ -243,6 +243,12 @@ point to <tt/cx320p1.tgi (cx320p1_tgi)/.
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a way that's compatible with some of the other color drivers).
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</descrip><p>
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<descrip>
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<tag><tt/cx640p1.tgi (cx640p1_tgi)/</tag>
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This driver features a resolution of 640 across and 480 down with 2 colors,
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black and white.
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</descrip><p>
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<sect1>Extended memory drivers<p>
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675
libsrc/cx16/tgi/cx640p1.s
Normal file
675
libsrc/cx16/tgi/cx640p1.s
Normal file
@ -0,0 +1,675 @@
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;
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; Graphics driver for the 640 pixels across, 480 pixels down, 2 color mode
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; on the Commander X16
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;
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; 2024-06-11, Scott Hutter
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; Based on code by Greg King
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;
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.include "zeropage.inc"
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.include "tgi-kernel.inc"
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.include "tgi-error.inc"
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.include "cbm_kernal.inc"
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.include "cx16.inc"
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.macpack generic
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.macpack module
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; ------------------------------------------------------------------------
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; Header. Includes jump table and constants.
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module_header _cx640p1_tgi ; 640 pixels across, 1 pixel per bit
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; First part of the header is a structure that has a signature,
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; and defines the capabilities of the driver.
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.byte $74, $67, $69 ; ASCII "tgi"
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.byte TGI_API_VERSION ; TGI API version number
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.addr $0000 ; Library reference
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.word 640 ; X resolution
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.word 480 ; Y resolution
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.byte 2 ; Number of drawing colors
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.byte 0 ; Number of screens available
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.byte 8 ; System font X size
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.byte 8 ; System font Y size
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.word $0100 ; Aspect ratio (based on VGA display)
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.byte 0 ; TGI driver flags
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; Next, comes the jump table. Currently, all entries must be valid,
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; and may point to an RTS for test versions (function not implemented).
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.addr INSTALL
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.addr UNINSTALL
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.addr INIT
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.addr DONE
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.addr GETERROR
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.addr CONTROL
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.addr CLEAR
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.addr SETVIEWPAGE
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.addr SETDRAWPAGE
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.addr SETCOLOR
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.addr SETPALETTE
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.addr GETPALETTE
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.addr GETDEFPALETTE
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.addr SETPIXEL
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.addr GETPIXEL
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.addr LINE
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.addr BAR
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.addr TEXTSTYLE
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.addr OUTTEXT
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; ------------------------------------------------------------------------
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; Constant
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; ------------------------------------------------------------------------
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; Data.
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; Variables mapped to the zero page segment variables. Some of these are
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; used for passing parameters to the driver.
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X1 = ptr1
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Y1 = ptr2
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X2 = ptr3
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Y2 = ptr4
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ADDR = tmp1 ; ADDR+1,2,3
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TEMP = tmp3
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TEMP2 = tmp4 ; HORLINE
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TEMP3 = sreg ; HORLINE
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; Absolute variables used in the code
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.bss
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; The colors are indicies into a TGI palette. The TGI palette is indicies into
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; VERA's palette. Vera's palette is a table of Red, Green, and Blue levels.
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; The first 16 RGB elements mimic the Commodore 64's colors.
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SCRBASE: .res 1 ; High byte of screen base
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BITMASK: .res 1 ; $00 = clear, $FF = set pixels
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defpalette: .res 2
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palette: .res 2
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color: .res 1 ; Stroke and fill index
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text_mode: .res 1 ; Old text mode
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tempX: .res 2
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tempY: .res 2
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ERR2: .res 1
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ERR: .res 1
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SY: .res 1
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SX: .res 1
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DY: .res 1
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DX: .res 1
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CURRENT_Y: .res 2
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CURRENT_X: .res 2
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.data
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ERROR: .byte TGI_ERR_OK ; Error code
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; Constants and tables
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.rodata
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veracolors:
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col_black: .byte %00000000, %00000000
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col_white: .byte %11111111, %00001111
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col_red: .byte %00000000, %00001000
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col_cyan: .byte %11111110, %00001010
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col_purple: .byte %01001100, %00001100
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col_green: .byte %11000101, %00000000
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col_blue: .byte %00001010, %00000000
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col_yellow: .byte %11100111, %00001110
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col_orange: .byte %10000101, %00001101
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col_brown: .byte %01000000, %00000110
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col_lred: .byte %01110111, %00001111
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col_gray1: .byte %00110011, %00000011
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col_gray2: .byte %01110111, %00000111
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col_lgreen: .byte %11110110, %00001010
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col_lblue: .byte %10001111, %00000000
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col_gray3: .byte %10111011, %00001011
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; Bit masks for setting pixels
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bitMasks1:
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.byte %10000000, %01000000, %00100000, %00010000
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.byte %00001000, %00000100, %00000010, %00000001
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bitMasks2:
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.byte %01111111, %10111111, %11011111, %11101111
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.byte %11110111, %11111011, %11111101, %11111110
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. May
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; initialize anything that has to be done just once. Is probably empty
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; most of the time.
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;
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; Must set an error code: NO
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INSTALL:
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; Create the default palette.
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lda #$00
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sta defpalette
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lda #$01
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sta defpalette+1
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; Fall through.
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; ------------------------------------------------------------------------
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; UNINSTALL routine. Is called before the driver is removed from memory. May
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; clean up anything done by INSTALL, but is probably empty most of the time.
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;
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; Must set an error code: NO
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UNINSTALL:
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rts
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; ------------------------------------------------------------------------
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; INIT: Changes an already installed device from text mode to graphics
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; mode.
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; Note that INIT/DONE may be called multiple times while the driver
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; is loaded, while INSTALL is called only once; so, any code that is needed
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; to initiate variables and so on must go here. Setting the palette is not
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; needed because that is called by the graphics kernel later.
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; The graphics kernel never will call INIT when a graphics mode already is
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; active, so there is no need to protect against that.
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;
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; Must set an error code: YES
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INIT: stz ERROR ; #TGI_ERR_OK
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; Save the current text mode.
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sec
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jsr SCREEN_MODE
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sta text_mode
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; Switch into (640 x 480 x 2 bpp) graphics mode.
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lda #%00000000 ; DCSEL = 0, VRAM port 1
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sta VERA::CTRL
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lda #%00100001 ; Disable sprites, layer 1 enable, VGA
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sta VERA::DISP::VIDEO
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lda #%00000100 ; Bitmap mode enable
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sta VERA::L1::CONFIG
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lda #%00000001 ; Tile width 640
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sta VERA::L1::TILE_BASE
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rts
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; ------------------------------------------------------------------------
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; DONE: Will be called to switch the graphics device back into text mode.
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; The graphics kernel never will call DONE when no graphics mode is active,
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; so there is no need to protect against that.
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;
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; Must set an error code: NO
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DONE:
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jsr CINT
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lda text_mode
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clc
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jmp SCREEN_MODE
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; ------------------------------------------------------------------------
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; GETERROR: Return the error code in .A, and clear it.
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GETERROR:
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lda ERROR
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stz ERROR
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rts
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; ------------------------------------------------------------------------
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; CONTROL: Platform-/driver-specific entry point.
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;
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; Must set an error code: YES
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CONTROL:
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lda #TGI_ERR_INV_FUNC
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sta ERROR
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rts
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; ------------------------------------------------------------------------
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; CLEAR: Clear the screen.
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;
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; Must set an error code: NO
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CLEAR:
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.scope inner
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; set up DCSEL=2
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lda #(2 << 1)
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sta VERA::CTRL
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; set cache writes
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lda #$40
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tsb VERA::DISP::VIDEO ; VERA_FX_CTRL when DCSEL=2
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; set FX cache to all zeroes
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lda #(6 << 1)
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sta VERA::CTRL
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lda #$00
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sta VERA::DISP::VIDEO
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sta VERA::DISP::HSCALE
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sta VERA::DISP::VSCALE
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sta VERA::DISP::FRAME
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stz VERA::CTRL
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; set address and increment for bitmap area
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stz VERA::ADDR
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stz VERA::ADDR + 1
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lda #$30 ; increment +4
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sta VERA::ADDR + 2
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ldy #$F0
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@blank_outer:
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ldx #$0A
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@blank_loop:
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.repeat 8
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stz VERA::DATA0
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.endrep
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dex
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bne @blank_loop
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dey
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bne @blank_outer
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; set up DCSEL=2
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lda #(2 << 1)
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sta VERA::CTRL
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; set FX off (cache write bit 1 -> 0)
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stz VERA::DISP::VIDEO ; VERA_FX_CTRL when DCSEL=2
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stz VERA::CTRL
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.endscope
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rts
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; ------------------------------------------------------------------------
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; SETVIEWPAGE: Set the visible page. Called with the new page in .A (0..n-1).
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; The page number already is checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will be called only if page OK)
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SETVIEWPAGE:
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; Fall through.
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; ------------------------------------------------------------------------
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; SETDRAWPAGE: Set the drawable page. Called with the new page in .A (0..n-1).
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; The page number already is checked to be valid by the graphics kernel.
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;
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; Must set an error code: NO (will be called only if page OK)
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SETDRAWPAGE:
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rts
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; ------------------------------------------------------------------------
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; SETPALETTE: Set the palette (not available with all drivers/hardware).
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; A pointer to the palette is passed in ptr1. Must set an error if palettes
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; are not supported
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;
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; Must set an error code: YES
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SETPALETTE:
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stz ERROR ; #TGI_ERR_OK
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ldy #$01 ; Palette size of 2 colors
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@L1: lda (ptr1),y ; Copy the palette
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sta palette,y
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dey
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bpl @L1
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; set background color from palette color 0
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lda #$00
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sta VERA::ADDR
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lda #$FA
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sta VERA::ADDR+1
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lda #$01
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sta VERA::ADDR+2 ; write color RAM @ $1FA00
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lda palette
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asl
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tay
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lda veracolors,y
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sta VERA::DATA0
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inc VERA::ADDR ; $1FA01
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lda palette
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asl
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tay
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iny ; second byte of color
|
||||
lda veracolors,y
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sta VERA::DATA0
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; set foreground color from palette color 1
|
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inc VERA::ADDR ; $1FA02
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||||
|
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lda palette+1
|
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asl
|
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tay
|
||||
lda veracolors,y
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sta VERA::DATA0
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|
||||
inc VERA::ADDR ; $1FA03
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|
||||
lda palette+1
|
||||
asl
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tay
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iny ; second byte of color
|
||||
lda veracolors,y
|
||||
sta VERA::DATA0
|
||||
rts
|
||||
|
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; ------------------------------------------------------------------------
|
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; SETCOLOR: Set the drawing color (in .A). The new color already is checked
|
||||
; to be in a valid range (0..maxcolor).
|
||||
;
|
||||
; Must set an error code: NO (will be called only if color OK)
|
||||
|
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SETCOLOR:
|
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tax
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||||
beq @L1
|
||||
lda #$FF
|
||||
@L1: sta BITMASK
|
||||
stx color
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; GETPALETTE: Return the current palette in .XA. Even drivers that cannot
|
||||
; set the palette should return the default palette here, so there's no
|
||||
; way for this function to fail.
|
||||
;
|
||||
; Must set an error code: NO
|
||||
|
||||
GETPALETTE:
|
||||
lda #<palette
|
||||
ldx #>palette
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; GETDEFPALETTE: Return the default palette for the driver in .XA. All
|
||||
; drivers should return something reasonable here, even drivers that don't
|
||||
; support palettes, otherwise the caller has no way to determine the colors
|
||||
; of the (not changable) palette.
|
||||
;
|
||||
; Must set an error code: NO (all drivers must have a default palette)
|
||||
|
||||
GETDEFPALETTE:
|
||||
lda #<defpalette
|
||||
ldx #>defpalette
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; SETPIXEL: Draw one pixel at X1/Y1 = ptr1/ptr2 with the current drawing
|
||||
; color. The co-ordinates passed to this function never are outside the
|
||||
; visible screen area, so there is no need for clipping inside this function.
|
||||
;
|
||||
; Must set an error code: NO
|
||||
|
||||
SETPIXEL:
|
||||
jsr CALC
|
||||
|
||||
stx TEMP
|
||||
|
||||
lda ADDR
|
||||
ldy ADDR+1
|
||||
ldx #$00
|
||||
|
||||
sta VERA::ADDR
|
||||
sty VERA::ADDR + 1
|
||||
stx VERA::ADDR + 2
|
||||
|
||||
ldx TEMP
|
||||
|
||||
lda BITMASK
|
||||
beq @ahead
|
||||
|
||||
; if BITMASK = $00, white is line color
|
||||
; Set the bit in the byte at VERA_DATA0
|
||||
lda VERA::DATA0 ; Load the byte at memory address
|
||||
ora bitMasks1,X ; OR with the bit mask
|
||||
sta VERA::DATA0 ; Store back the modified byte
|
||||
rts
|
||||
|
||||
@ahead:
|
||||
; if BITMASK = $FF, black is line color
|
||||
lda VERA::DATA0 ; Load the byte at memory address
|
||||
and bitMasks2,X ; OR with the bit mask
|
||||
sta VERA::DATA0 ; Store back the modified byte
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; GETPIXEL: Read the color value of a pixel, and return it in .XA. The
|
||||
; co-ordinates passed to this function never are outside the visible screen
|
||||
; area, so there is no need for clipping inside this function.
|
||||
|
||||
GETPIXEL:
|
||||
jsr CALC
|
||||
|
||||
stx TEMP
|
||||
|
||||
lda ADDR
|
||||
ldy ADDR+1
|
||||
ldx #$00
|
||||
|
||||
sta VERA::ADDR
|
||||
sty VERA::ADDR + 1
|
||||
stx VERA::ADDR + 2
|
||||
|
||||
ldx TEMP
|
||||
lda VERA::DATA0 ; Load the byte at memory address
|
||||
and bitMasks1,X
|
||||
|
||||
bne @ahead
|
||||
|
||||
ldx #$00
|
||||
lda #$00
|
||||
rts
|
||||
|
||||
@ahead:
|
||||
ldx #$00
|
||||
lda #$01
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; BAR: Draw a filled rectangle with the corners X1/Y1, X2/Y2, where
|
||||
; X1/Y1 = ptr1/ptr2 and X2/Y2 = ptr3/ptr4, using the current drawing color.
|
||||
; Contrary to most other functions, the graphics kernel will sort and clip
|
||||
; the co-ordinates before calling the driver; so on entry, the following
|
||||
; conditions are valid:
|
||||
; X1 <= X2
|
||||
; Y1 <= Y2
|
||||
; (X1 >= 0) && (X1 < XRES)
|
||||
; (X2 >= 0) && (X2 < XRES)
|
||||
; (Y1 >= 0) && (Y1 < YRES)
|
||||
; (Y2 >= 0) && (Y2 < YRES)
|
||||
;
|
||||
; Must set an error code: NO
|
||||
|
||||
BAR:
|
||||
; Initialize tempY with Y1
|
||||
lda Y1
|
||||
sta tempY
|
||||
lda Y1+1
|
||||
sta tempY+1
|
||||
|
||||
@outer_loop:
|
||||
; Compare tempY with Y2
|
||||
lda tempY+1
|
||||
cmp Y2+1
|
||||
bcc @outer_continue ; If tempY high byte < Y2 high byte, continue
|
||||
bne @outer_end ; If tempY high byte > Y2 high byte, end
|
||||
lda tempY
|
||||
cmp Y2
|
||||
bcc @outer_continue ; If tempY low byte < Y2 low byte, continue
|
||||
beq @outer_end ; If tempY low byte = Y2 low byte, end
|
||||
|
||||
@outer_continue:
|
||||
; Initialize tempX with X1
|
||||
lda X1
|
||||
sta tempX
|
||||
lda X1+1
|
||||
sta tempX+1
|
||||
|
||||
@inner_loop:
|
||||
; Compare tempX with X2
|
||||
lda tempX+1
|
||||
cmp X2+1
|
||||
bcc @inner_continue ; If tempX high byte < X2 high byte, continue
|
||||
bne @inner_end ; If tempX high byte > X2 high byte, end
|
||||
lda tempX
|
||||
cmp X2
|
||||
bcc @inner_continue ; If tempX low byte < X2 low byte, continue
|
||||
|
||||
@inner_end:
|
||||
; Increment tempY
|
||||
inc tempY
|
||||
bne @outer_loop ; If no overflow, continue outer loop
|
||||
inc tempY+1 ; If overflow, increment high byte
|
||||
|
||||
@inner_continue:
|
||||
; Call setpixel(tempX, tempY)
|
||||
lda X1
|
||||
pha
|
||||
lda X1+1
|
||||
pha
|
||||
lda Y1
|
||||
pha
|
||||
lda Y1+1
|
||||
pha
|
||||
|
||||
lda tempX
|
||||
ldx tempX+1
|
||||
sta X1
|
||||
stx X1+1
|
||||
|
||||
lda tempY
|
||||
ldx tempY+1
|
||||
sta Y1
|
||||
stx Y1+1
|
||||
|
||||
jsr SETPIXEL
|
||||
|
||||
pla
|
||||
sta Y1+1
|
||||
pla
|
||||
sta Y1
|
||||
pla
|
||||
sta X1+1
|
||||
pla
|
||||
sta X1
|
||||
|
||||
; Increment tempX
|
||||
inc tempX
|
||||
bne @inner_loop_check ; If no overflow, continue
|
||||
inc tempX+1 ; If overflow, increment high byte
|
||||
|
||||
@inner_loop_check:
|
||||
; Compare tempX with X2 again after increment
|
||||
lda tempX+1
|
||||
cmp X2+1
|
||||
bcc @inner_continue ; If tempX high byte < X2 high byte, continue
|
||||
bne @outer_increment ; If tempX high byte > X2 high byte, increment tempY
|
||||
lda tempX
|
||||
cmp X2
|
||||
bcc @inner_continue ; If tempX low byte < X2 low byte, continue
|
||||
|
||||
@outer_increment:
|
||||
; Increment tempY
|
||||
inc tempY
|
||||
bne @outer_loop ; If no overflow, continue outer loop
|
||||
inc tempY+1 ; If overflow, increment high byte
|
||||
|
||||
@outer_end:
|
||||
jmp @done
|
||||
|
||||
@done:
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; TEXTSTYLE: Set the style used when calling OUTTEXT. Text scaling in X and Y
|
||||
; directions are passed in .X and .Y, the text direction is passed in .A.
|
||||
;
|
||||
; Must set an error code: NO
|
||||
|
||||
TEXTSTYLE:
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; OUTTEXT: Output text at X/Y = ptr1/ptr2 using the current color and the
|
||||
; current text style. The text to output is given as a zero-terminated
|
||||
; string with address in ptr3.
|
||||
;
|
||||
; Must set an error code: NO
|
||||
|
||||
OUTTEXT:
|
||||
rts
|
||||
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Calculate all variables to plot the pixel at X1/Y1.
|
||||
;------------------------
|
||||
;< X1,Y1 - pixel
|
||||
;> ADDR - address of card
|
||||
;> X - bit number (X1 & 7)
|
||||
CALC:
|
||||
lda Y1+1
|
||||
sta ADDR+1
|
||||
lda Y1
|
||||
asl
|
||||
rol ADDR+1
|
||||
asl
|
||||
rol ADDR+1 ; Y*4
|
||||
clc
|
||||
adc Y1
|
||||
sta ADDR
|
||||
lda Y1+1
|
||||
adc ADDR+1
|
||||
sta ADDR+1 ; Y*4+Y=Y*5
|
||||
lda ADDR
|
||||
asl
|
||||
rol ADDR+1
|
||||
asl
|
||||
rol ADDR+1
|
||||
asl
|
||||
rol ADDR+1
|
||||
asl
|
||||
rol ADDR+1
|
||||
sta ADDR ; Y*5*16=Y*80
|
||||
lda X1+1
|
||||
sta TEMP
|
||||
lda X1
|
||||
lsr TEMP
|
||||
ror
|
||||
lsr TEMP
|
||||
ror
|
||||
lsr TEMP
|
||||
ror
|
||||
clc
|
||||
adc ADDR
|
||||
sta ADDR
|
||||
lda ADDR+1 ; ADDR = Y*80+x/8
|
||||
adc TEMP
|
||||
sta ADDR+1
|
||||
lda ADDR+1
|
||||
lda X1
|
||||
and #7
|
||||
tax
|
||||
rts
|
||||
|
||||
|
||||
.include "../../tgi/tgidrv_line.inc"
|
||||
Loading…
Reference in New Issue
Block a user