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https://github.com/nippur72/apple1-videocard-lib.git
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55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
#ifndef SPRITES_H
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#define SPRITES_H
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typedef struct {
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byte y;
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byte x;
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byte name;
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byte color;
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} tms_sprite;
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#define SIZEOF_SPRITE 4
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void tms_set_sprite(byte sprite_num, tms_sprite *s) {
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word addr = TMS_SPRITE_ATTRS + (word) (sprite_num * SIZEOF_SPRITE);
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tms_set_vram_write_addr(addr);
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// TODO verify NOPs on real machine
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// TODO is it better to use tms_copy_to_vram() ?
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TMS_WRITE_DATA_PORT(s->y); NOP; // y coordinate
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TMS_WRITE_DATA_PORT(s->x); NOP; // x coordinate
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TMS_WRITE_DATA_PORT(s->name); NOP; // name
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TMS_WRITE_DATA_PORT(s->color); NOP; // color
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}
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void tms_set_sprite_double_size(byte size) {
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byte regval = tms_regs_latch[1] & (REG1_SIZE_MASK ^ 0xFF);
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if(size) regval |= REG1_SIZE_MASK;
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tms_write_reg(1, regval);
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}
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void tms_set_sprite_magnification(byte m) {
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byte regval = tms_regs_latch[1] & (REG1_MAG_MASK ^ 0xFF);
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if(m) regval |= REG1_MAG_MASK;
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tms_write_reg(1, regval);
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}
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// clears all the sprites
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void tms_clear_sprites() {
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// fills first sprite pattern with 0
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tms_set_vram_write_addr(TMS_SPRITE_PATTERNS);
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for(byte i=0;i<8;i++) {
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TMS_WRITE_DATA_PORT(0);
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}
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// set sprite coordinates to (0,0) and set pattern name 0
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tms_set_vram_write_addr(TMS_SPRITE_ATTRS);
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for(byte i=0;i<32;i++) {
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TMS_WRITE_DATA_PORT(0); NOP; NOP; NOP; NOP; // y coordinate
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TMS_WRITE_DATA_PORT(0); NOP; NOP; NOP; NOP; // x coordinate
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TMS_WRITE_DATA_PORT(0); NOP; NOP; NOP; NOP; // name
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TMS_WRITE_DATA_PORT(0); NOP; NOP; NOP; NOP; // color
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}
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}
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#endif
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