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tfv: initial screen copy routine
This commit is contained in:
Vince Weaver
parent
225dc6f4cc
commit
4d846e778b
@ -605,23 +605,40 @@ short gr_addr_lookup[48]={
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int grsim_put_sprite(unsigned char *sprite_data, int xpos, int ypos) {
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int i,j,xsize,ysize;
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unsigned char i;
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unsigned char *ptr;
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short address;
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ptr=sprite_data;
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xsize=*ptr;
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x=*ptr;
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ptr++;
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ysize=*ptr;
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ram[CV]=*ptr;
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ptr++;
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for(j=0;j<ysize;j++) {
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address=gr_addr_lookup[(ypos+j)/2];
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while(1) {
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address=gr_addr_lookup[ypos/2];
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address+=xpos;
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for(i=0;i<xsize;i++) {
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if (*ptr) ram[address]=*ptr;
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for(i=0;i<x;i++) {
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a=*ptr;
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if (a==0) {
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}
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else if ((a&0xf0)==0) {
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ram[address]&=0xf0;
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ram[address]|=a;
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}
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else if ((a&0x0f)==0) {
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ram[address]&=0x0f;
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ram[address]|=a;
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}
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else {
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ram[address]=a;
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}
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ptr++;
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address++;
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}
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ypos++;
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ram[CV]--;
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if (ram[CV]==0) break;
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}
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return 0;
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@ -6,12 +6,12 @@ PNG2GR = ../gr-utils/png2gr
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all: tfv.dsk
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tfv.dsk: TITLE.GR TFV ED
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$(DOS33) -y tfv.dsk BSAVE -a 0xc00 TFV
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$(DOS33) -y tfv.dsk BSAVE -a 0x1000 TFV
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$(DOS33) -y tfv.dsk BSAVE -a 0x400 TITLE.GR
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$(DOS33) -y tfv.dsk BSAVE -a 0x900 ED
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TFV: tfv.o
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ld65 -o TFV tfv.o -C ./apple2_c00.inc
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ld65 -o TFV tfv.o -C ./apple2_1000.inc
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tfv.o: tfv.s title.inc
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ca65 -o tfv.o tfv.s -l tfv.lst
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@ -27,3 +27,4 @@ TITLE.GR: title.png
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clean:
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rm -f *~ TITLE.GR *.o *.lst ED
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12
tfv/apple2_1000.inc
Normal file
12
tfv/apple2_1000.inc
Normal file
@ -0,0 +1,12 @@
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MEMORY {
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ZP: start = $00, size = $1A, type = rw;
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RAM: start = $1000, size = $8E00, file = %O;
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}
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SEGMENTS {
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CODE: load = RAM, type = ro;
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RODATA: load = RAM, type = ro;
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DATA: load = RAM, type = rw;
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BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = zp;
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}
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79
tfv/tfv.s
79
tfv/tfv.s
@ -40,9 +40,13 @@ MASK EQU $2E
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COLOR EQU $30
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FIRST EQU $F0
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TEMP EQU $FA
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RUN EQU $FA
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TEMP2 EQU $FB
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TEMP EQU $FA
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RUN EQU $FA
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TEMP2 EQU $FB
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INL EQU $FC
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INH EQU $FD
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OUTL EQU $FE
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OUTH EQU $FF
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;=============================
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; set low-res graphics, page 0
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@ -55,6 +59,10 @@ TEMP2 EQU $FB
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;=================
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jsr CLRTOP
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lda #$c
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sta BASH
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lda #$0
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sta BASL ; load image off-screen 0xc00
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lda #>(title_image)
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sta GBASH
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@ -62,14 +70,22 @@ TEMP2 EQU $FB
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sta GBASL
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jsr load_rle_gr
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jsr gr_copy
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lda #$4
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sta BASH
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lda #$0
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sta BASL ; 0x400 is GR page 0
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sta BASL ; restore to 0x400 (page 0)
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; copy to 0x400 (page 0)
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; Return to BASIC?
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rts
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;=====================================================================
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;= ROUTINES
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;=====================================================================
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;=================
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; load RLE image
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;=================
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@ -184,4 +200,59 @@ set_gr_page0:
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bit GR ; set graphics
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rts
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;=========================================================
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; gr_copy
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;=========================================================
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; for now copy 0xc00 to 0x400
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; 2 + 8*38 + 4*80*23 + 4*120*26 + 13 = 20,159 = 20ms = 50Hz
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gr_copy:
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ldx #0 ; set y to zero ; 2
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gr_copy_loop:
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stx TEMP ; save y ; 3
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txa ; move to A ; 2
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asl ; mult by 2 ; 2
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tay ; put into Y ; 2
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lda gr_offsets,Y ; lookup low byte for line addr ; 5
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sta OUTL ; out and in are the same ; 3
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sta INL ; 3
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lda gr_offsets+1,Y ; lookup high byte for line addr ; 5
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sta OUTH ; 3
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adc #$8 ; for now, fixed 0xc ; 2
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sta INH ; 3
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ldx TEMP ; restore y ; 3
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ldy #0 ; set X counter to 0 ; 2
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gr_copy_line:
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lda (INL),Y ; load a byte ; 5
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sta (OUTL),Y ; store a byte ; 6
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iny ; increment pointer ; 2
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cpx #$4 ; don't want to copy bottom 4*40 ; 2
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bcs gr_copy_above4 ; 3
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gr_copy_below4:
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cpy #120 ; for early ones, copy 120 bytes ; 2
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bne gr_copy_line ; 3
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beq gr_copy_line_done ; 3
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gr_copy_above4: ; for last four, just copy 80 bytes
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cpy #80 ; 2
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bne gr_copy_line ; 3
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gr_copy_line_done:
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inx ; increment y value ; 2
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cpx #8 ; there are 8 of them ; 2
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bne gr_copy_loop ; if not, loop ; 3
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rts ; 6
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; waste memory with a lookup table
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; maybe faster than using GBASCALC?
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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.include "title.inc"
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