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intro.c
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intro.c
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#include <gb/gb.h>
#include "defines.h"
#include "fade.h"
#include "gamestate.h"
#include "intro.h"
#include "intro_bg.h"
#include "data/sprite/intro_sprites.h"
#include "data/sprite/intro_flash.h"
UBYTE intro_frame;
extern UBYTE intro_song_data;
#define INTRO_STATE_WALK 1U
#define INTRO_STATE_TRIP 2U
#define INTRO_STATE_BLINK 3U
void initIntro() {
disable_interrupts();
DISPLAY_OFF;
move_bkg(0U, 112U);
OBP0_REG = 0xD0U; // 11010000
BGP_REG = 0xE4U; // 11100100
set_bkg_data_rle(0U, intro_bg_data_length, intro_bg_data);
set_bkg_tiles_rle(0U, 0U, intro_bg_tiles_width, intro_bg_tiles_height, intro_bg_tiles);
set_sprite_data(0U, intro_sprites_data_length, intro_sprites_data);
clearSprites();
setMusicBank(6U);
playMusic(&intro_song_data);
HIDE_WIN;
SHOW_SPRITES;
SHOW_BKG;
SPRITES_8x16;
DISPLAY_ON;
enable_interrupts();
}
void updateIntro() {
UBYTE frame;
switch(scene_state) {
case INTRO_STATE_WALK:
if(ticks & 1U) {
player_x--;
cat_x--;
}
if((ticks & 7U) == 7U) {
intro_frame++;
if(intro_frame == 6U) intro_frame = 0U;
}
frame = intro_frame << 2;
// Player sprites
setSprite(player_x, player_y-scroll_y, frame, OBJ_PAL0);
setSprite(player_x+8, player_y-scroll_y, frame+2U, OBJ_PAL0);
// Cat sprites
cat_y = player_y-12U + ((ticks & 16U) >> 4);
setSprite(cat_x, cat_y-scroll_y-16U, 32U, OBJ_PAL0);
setSprite(cat_x+8U, cat_y-scroll_y-16U, 34U, OBJ_PAL0);
setSprite(cat_x, cat_y-scroll_y, 36U, OBJ_PAL0);
setSprite(cat_x+8U, cat_y-scroll_y, 38U, OBJ_PAL0);
if(player_x == 77U) {
scene_state = INTRO_STATE_TRIP;
player_y = 239U;
ticks = 0U;
}
break;
case INTRO_STATE_TRIP:
if(ticks & 1U) {
if(player_x < 55U) {
if(cat_y >= 130U || (ticks & 3U) == 3U) {
cat_y--;
}
}
if(player_x != 45U) player_x--;
}
if((ticks & 3U) == 3U) {
if(scroll_y && cat_y < scroll_y+64U) {
scroll_y--;
}
}
if((ticks & 7U) == 7U) {
if(cat_y >= 130U || (ticks & 15U) == 15U) {
cat_x++;
}
}
if((ticks & 15U) == 15U) {
if(player_x != 45U) player_y++;
}
if(player_x > 45U) {
frame = 24U;
} else {
frame = 28U;
player_y = 240U;
}
// Player sprites
setSprite(player_x, player_y-scroll_y, frame, OBJ_PAL0);
setSprite(player_x+8, player_y-scroll_y, frame+2U, OBJ_PAL0);
// Player shocked mark
if(player_x > 68U) {
setSprite(player_x, player_y-scroll_y-13U, 52U, OBJ_PAL0);
setSprite(player_x+8, player_y-scroll_y-13U, 54U, OBJ_PAL0);
}
// Exclamation mark
if((ticks & 16U) && cat_y < 210U && cat_y > 180U) {
setSprite(player_x+4U, player_y-scroll_y-13U, 50U, OBJ_PAL0);
}
frame = 56U;
if(cat_y < 180U) {
frame = 40U;
}
if(cat_y < 130U) {
setSprite(cat_x+4U, cat_y-scroll_y-10U, 48U, OBJ_PAL0);
} else {
setSprite(cat_x, cat_y-scroll_y-16U, frame, OBJ_PAL0);
setSprite(cat_x+8U, cat_y-scroll_y-16U, frame+2U, OBJ_PAL0);
setSprite(cat_x, cat_y-scroll_y, frame+4U, OBJ_PAL0);
setSprite(cat_x+8U, cat_y-scroll_y, frame+6U, OBJ_PAL0);
}
if(cat_y < 110U) {
scene_state = INTRO_STATE_BLINK;
intro_frame = 0U;
set_sprite_data(0U, intro_flash_data_length, intro_flash_data);
}
break;
case INTRO_STATE_BLINK:
if((ticks & 3U) == 3U) {
if(scroll_y) {
scroll_y--;
}
}
if((ticks & 3U) == 3U) {
intro_frame++;
}
if(intro_frame == 0U) {
setSprite(cat_x, cat_y-scroll_y-16U, 0U, OBJ_PAL0);
setSprite(cat_x+8U, cat_y-scroll_y-16U, 2U, OBJ_PAL0);
setSprite(cat_x+16U, cat_y-scroll_y-16U, 4U, OBJ_PAL0);
setSprite(cat_x, cat_y-scroll_y, 6U, OBJ_PAL0);
setSprite(cat_x+8U, cat_y-scroll_y, 8U, OBJ_PAL0);
setSprite(cat_x+16U, cat_y-scroll_y, 10U, OBJ_PAL0);
}
else if(intro_frame == 1U) {
setSprite(cat_x+9U, cat_y-scroll_y-4U, 12U, OBJ_PAL0);
}
else if(intro_frame == 2U) {
setSprite(cat_x+4U, cat_y-scroll_y-8U, 16U, OBJ_PAL0);
setSprite(cat_x+12U, cat_y-scroll_y-8U, 18U, OBJ_PAL0);
}
else if(intro_frame == 3U) {
setSprite(cat_x-2U, cat_y-scroll_y-11U, 20U, OBJ_PAL0);
setSprite(cat_x+2U, cat_y-scroll_y-11U, 22U, OBJ_PAL0);
setSprite(cat_x+10U, cat_y-scroll_y-11U, 24U, OBJ_PAL0);
setSprite(cat_x+18U, cat_y-scroll_y-11U, 26U, OBJ_PAL0);
}
else if(intro_frame == 4U) {
setSprite(cat_x-2U, cat_y-scroll_y-11U, 28U, OBJ_PAL0);
setSprite(cat_x+2U, cat_y-scroll_y-11U, 30U, OBJ_PAL0);
setSprite(cat_x+10U, cat_y-scroll_y-11U, 32U, OBJ_PAL0);
setSprite(cat_x+18U, cat_y-scroll_y-11U, 34U, OBJ_PAL0);
}
if(scroll_y == 16U) {
gamestate = GAMESTATE_TITLE;
}
break;
}
}
void enterIntro() {
initIntro();
fadeFromWhite(6U);
scene_state = INTRO_STATE_WALK;
scroll_y = 112U;
player_x = 185U;
player_y = 240U;
cat_x = player_x + 13U;
cat_y = 228U;
intro_frame = 0U;
ticks = 0U;
while(gamestate == GAMESTATE_INTRO) {
updateJoystate();
updateIntro();
ticks++;
if(CLICKED(J_START)) {
gamestate = GAMESTATE_TITLE;
}
clearRemainingSprites();
wait_vbl_done();
move_bkg(0U, scroll_y);
}
clearRemainingSprites();
fadeToWhite(10U);
stopMusic();
}