mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-11-21 23:30:58 +00:00
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
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#include "common.h"
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//#link "common.c"
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#include "sprites.h"
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//#link "sprites.c"
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/*{w:12,h:21,bpp:2,brev:1}*/
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const char SPRITEMC[3*21] = {
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0x00,0xAA,0x80,0x02,0xAA,0xA0,0x0A,0xAA,0xA8,
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0x0A,0xAE,0xA8,0x0A,0xBB,0xA8,0x0A,0xBA,0xA8,
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0x0A,0xBB,0xA8,0x0A,0xAE,0xA8,0x0A,0xAA,0xA8,
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0x09,0xAA,0x98,0x08,0x6A,0x48,0x08,0x1D,0x08,
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0x02,0x0C,0x20,0x02,0x0C,0x20,0x02,0x0C,0x20,
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0x00,0x8C,0x80,0x00,0x8C,0x80,0x00,0x55,0x40,
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0x00,0x77,0x40,0x00,0x5D,0x40,0x00,0x15,0x00
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};
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#define SPRITE_SHAPE 192
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// X/Y position arrays
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int xpos[8]; // fixed point 9.7
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int ypos[8]; // fixed point 8.8
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// X/Y velocity arrays
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int xvel[8];
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int yvel[8];
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void init_sprites(void) {
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byte i;
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// setup sprite positions
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for (i=0; i<8; i++) {
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xpos[i] = ((i & 3) * 0x2000) - 0x3000;
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ypos[i] = (i * 0x1000) - 0x3000;
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sprshad.spr_color[i] = i | 8;
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}
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}
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void move_sprites(void) {
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byte i;
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for (i=0; i<8; i++) {
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//VIC.bordercolor = i;
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sprite_draw(i,
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(xpos[i] >> 7) + 172,
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(ypos[i] >> 8) + 145,
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SPRITE_SHAPE);
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// update position
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xpos[i] += xvel[i];
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ypos[i] += yvel[i];
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}
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}
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void update_sprites(void) {
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byte i;
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for (i=0; i<8; i++) {
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// update velocity
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xvel[i] -= xpos[i] >> 12;
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yvel[i] -= ypos[i] >> 12;
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}
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}
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void collide_sprites(byte spr_coll) {
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byte i;
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byte mask = 1;
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// exit if no collisions
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if (!spr_coll) return;
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// iterate all sprites that have their flag set
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for (i=0; i<8; i++, mask<<=1) {
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//VIC.bordercolor = i;
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if (spr_coll & mask) {
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// find the first sprite that intersects
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byte j = sprite_get_closest_collision(i, spr_coll);
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// returns 0..7 if a sprite was found
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if (j < 8) {
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xvel[i] = (xpos[i] - xpos[j]) >> 4;
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yvel[i] = (ypos[i] - ypos[j]) >> 4;
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}
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}
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}
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}
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void iterate_game(void) {
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byte spr_coll;
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// wait for vblank
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waitvsync();
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// grab and reset sprite-sprite collision flags
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spr_coll = VIC.spr_coll;
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// then update sprite registers from shadow RAM
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sprite_update(DEFAULT_SCREEN);
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// draw sprites into shadow ram
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move_sprites();
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// and update velocity and position
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update_sprites();
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// if any flags are set in the collision register,
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// process sprite collisions
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collide_sprites(spr_coll);
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}
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void main(void) {
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clrscr();
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VIC.bordercolor = 0;
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// setup sprite library and copy sprite to VIC bank
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sprite_clear();
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sprite_set_shapes(SPRITEMC, SPRITE_SHAPE, 1);
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// set colors
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sprshad.spr_mcolor = 0xff;
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VIC.spr_mcolor0 = 4;
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VIC.spr_mcolor1 = 7;
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// set sprite initial positions
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init_sprites();
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// game loop
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while (1) {
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iterate_game();
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}
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}
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