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Added Two Player Score Kernel to humans.c02

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This commit is contained in:
Curtis F Kaylor 2017-07-01 00:49:49 -04:00
parent 8877655497
commit 883c927301
4 changed files with 99 additions and 6 deletions
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13
vcs/humans.c02
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@ -4,6 +4,7 @@
#include <vcshead.h02> //TIA and RIOT Registers
#include <vcsstub.h02> //VCS Program Stub
#include <vcslib.h02> //VCS Library Routines
#include <score2.h02> //Two Player Score Kernel
#include <k2line.h02> //Two Line Game Kernel
//TIA Register Bit Masks
@ -15,7 +16,7 @@
#define P0DIFF = $40 //Player 0 Difficulty
//Constants Required by k2line.h02
#define KNLLNS = 96 //Kernal Lines (Scanlines/2)
#define KNLLNS = 90 //Kernal Lines (Scanlines/2)
#define P0HGHT = 10 //Player 0 Height
#define P1HGHT = 10 //Player 1 Height
@ -33,17 +34,17 @@ void setup() {
/* Vertical Blank Code */
void vrtblk() {
scrprp(); //Prepare Score For Display
posobj(0,0); //Set P0 X-Position
p0prep(191, &human); //Set P0 Y-Position & Graphics Pointer
p0prep(179, &human); //Set P0 Y-Position & Graphics Pointer
posobj(8,1); //Set P1 X-Position
p1prep(191, &human); //Set P1 Y-Position & Graphics Pointer
//VDELP0 = (SWCHB & #P0DIFF) ? #SET : #CLEAR;
//VDELP1 = (SWCHB & #P1DIFF) ? #SET : #CLEAR;
p1prep(179, &human); //Set P1 Y-Position & Graphics Pointer
}
/* Execute Kernel Code */
void kernel() {
dsplns(); //Display Playfield and Objects
scrdsp(); //Display Scores
dsplns(); //Display Playfield and Objects
}
/* Execute Overscan Code */

2
vcs/include/k2line.a02
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@ -81,6 +81,8 @@ P1PREP: CLC ;Add 1 to Y-Position
;Uses: KNLLNS, P0HGHT, P1HGHT, P0PTRL, P1PTRL
;Affects: A,X,Y,C,N,Z
DSPLNS: LDY #KNLLNS ; - Number of Kernal Lines (Scanlines / 2)
LDA #1 ; - Reflect Playfield
STA CTRLPF ; - Set Playfield Control Register
LDA #P1HGHT-1 ; - Preset GRP1 if Player 1 on Top Line
DCP P1DRAW ;
BCS DSPLN0 ;

77
vcs/include/score2.a02 Normal file
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@ -0,0 +1,77 @@
;Atari 2600 Two Player Score Kernel
;Score Routine Variables
SCORE0 EQU $E8 ;Player One Score
SCORE1 EQU $E9 ;Player Two Score
SC0ONE EQU $EA ;One Score Ones Digit Offset
SC1ONE EQU $EB ;Player Ten Score Ones Digit Offset
SC0TEN EQU $EC ;Player One Score Ones Digit Offset
SC1TEN EQU $ED ;Player Ten Score Ones Digit Offset
SC0GFX EQU $EE ;Player One Score Graphics Data
SC1GFX EQU $EF ;Player Two Score Graphics Data
;Prep Scores For Diplay
SCRPRP: LDX #1 ;Offset into SCORE0/SCORE1
SCRPRL: LDA SCORE0,X ;Get SCORE1 (First Pass) or SCORE0 (Second Pass)
AND #$0F ;Remove Tens Digit
STA TEMP0 ;And Save It
ASL ;Multiply By 4
ASL ;(Carry will be Clear because of AND/ASL)
ADC TEMP0 ;Add To Original Value for Multiply by 5
STA SC0ONE,X ;Store in SC0ONE (First Pass) or SC1ONE (Second Pass)
LDA SCORE0,X ;Get SCORE1 (First Pass) or SCORE0 (Second Pass)
AND #$F0 ;Remove Ones Digit
LSR ;Divide by 4
LSR ;
STA TEMP0 ;And Save It
LSR ;Divide by 4 Again
LSR ;(Leaving Carry Clear)
ADC TEMP0 ;Add Saved Value, Resulting in Digit / 16 * 5
STA SC0TEN,X ;Store in SC0TEN (First Pass) or SC1TEN (Second Pass)
DEX ;Point to SCORE 1
BPL SCRPRL ;AND Loop if >0
RTS ;Return
;Display Score Kernel - Uses 12 Lines Total
SCRDSP: LDA #2 ; - Use Player Colors
STA CTRLPF ; - Set Playfield Control Register
LDX #5 ; 43 - cycle after looping
SCRDSL: LDY SC0TEN ; 3 46 - get the tens digit offset for the Score
LDA DGTGFX,Y ; 5 51 - use it to load the digit graphics
AND #$F0 ; 2 53 - remove the graphics for the ones digit
STA SC0GFX ; 3 56 - AND save it
LDY SC0ONE ; 3 59 - get the ones digit offset for the Score
LDA DGTGFX,Y ; 5 64 - use it to load the digit graphics
AND #$0F ; 2 66 - remove the graphics for the tens digit
ORA SC0GFX ; 3 69 - merge with the tens digit graphics
STA SC0GFX ; 3 72 - AND save it
STA WSYNC ; 3 75 - wait for end of scanline
STA PF1 ; 3 3 - @66-28, update playfield for Score dislay
LDY SC1TEN ; 3 6 - get the left digit offset for the Timer
LDA DGTGFX,Y ; 5 11 - use it to load the digit graphics
AND #$F0 ; 2 13 - remove the graphics for the ones digit
STA SC1GFX ; 3 16 - AND save it
LDY SC1ONE ; 3 19 - get the ones digit offset for the Timer
LDA DGTGFX,Y ; 5 24 - use it to load the digit graphics
AND #$0F ; 2 26 - remove the graphics for the tens digit
ORA SC1GFX ; 3 29 - merge with the tens digit graphics
STA SC1GFX ; 3 32 - AND save it
JSR SCRDSR ;12 44 - waste 12 cycles
STA PF1 ; 3 47 - @39-54, update playfield for Timer display
LDY SC0GFX ; 3 50 - preload for next scanline
STA WSYNC ; 3 53 - wait for end of scanline
STY PF1 ; 3 3 - @66-28, update playfield for the Score display
INC SC0TEN ; 5 8 - advance for the next line of graphic data
INC SC1TEN ; 5 13 - advance for the next line of graphic data
INC SC0ONE ; 5 18 - advance for the next line of graphic data
INC SC1ONE ; 5 23 - advance for the next line of graphic data
JSR SCRDSR ;12 35 - waste 12 cycles
DEX ; 2 37 - decrease the loop counter
STA PF1 ; 3 40 - @39-54, update playfield for the Timer display
BNE SCRDSL ; 2 42 - (3 43) if dex != 0 then branch to ScoreLoop
STA WSYNC ; 3 45 - wait for end of scanline
STX PF1 ; 3 3 - x = 0, so this blanks out playfield
STA WSYNC ; 3 6 - wait for end of scanline
SCRDSR: RTS ; 6 12 - Return

13
vcs/include/score2.h02 Normal file
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@ -0,0 +1,13 @@
/* Atari 2600 Two-Player Score Kernel */
char score1; //Player One Score
char score2; //Player Two Score
char sc1one; //Player One Score Ones Digit Offset
char sc1ten; //Player One Score Ones Digit Offset
char sc2one; //Player Ten Score Ones Digit Offset
char sc2ten; //Player Ten Score Ones Digit Offset
char sc1gfx; //Player One Score Graphics Data
char sc2gfx; //Player Two Score Graphics Data