90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
#include "affine_background.h"
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#include "affine_background_gfx.h"
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#include "affine_main_menu_background_gfx.h"
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#include "graphic_utils.h"
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BG_AFFINE bgaff;
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AFF_SRC_EX asx = {0};
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enum AffineBackgroundID background = AFFINE_BG_MAIN_MENU;
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void affine_background_init()
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{
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affine_background_change_background(background);
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affine_background_update();
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bgaff = bg_aff_default;
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}
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void affine_background_update()
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{
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static uint timer = 0;
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timer++;
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switch (background)
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{
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case AFFINE_BG_MAIN_MENU:
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asx.scr_x = SCREEN_WIDTH / 2;
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asx.scr_y = SCREEN_HEIGHT / 2;
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asx.tex_x = 16560;
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asx.tex_y = 14400;
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asx.sx = 128;
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asx.sy = 128;
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asx.alpha = 1000; // This slightly rotates it which increases the perceived resolution of the background
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break;
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case AFFINE_BG_GAME:
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asx.scr_x = 0;
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asx.scr_y = 0;
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asx.tex_x += 5;
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asx.tex_y += 12;
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asx.sx = (lu_sin(timer * 100)) >> 8; // Scale the sine value to fit in a s16
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asx.sx += 256; // Add 256 to the sine value to make it positive
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asx.sy = (lu_sin(timer * 100 + 0x4000)) >> 8; // Scale the sine value to fit in a s16
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asx.sy += 256; // Add 256 to the sine value to make it positive
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asx.alpha = 0;
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break;
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}
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bg_rotscale_ex(&bgaff, &asx);
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REG_BG_AFFINE[2] = bgaff;
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}
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void affine_background_set_color(COLOR color)
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{
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memcpy16(&pal_bg_mem[AFFINE_BG_PB], affine_main_menu_background_gfxPal, AFFINE_BG_PAL_LEN);
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for (int i = 0; i < AFFINE_BG_PAL_LEN; i++)
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{
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clr_rgbscale(&pal_bg_mem[AFFINE_BG_PB] + i, &pal_bg_mem[AFFINE_BG_PB] + i, 1, color);
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}
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}
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void affine_background_load_palette(const u16 *src)
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{
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memcpy16(&pal_bg_mem[AFFINE_BG_PB], src, AFFINE_BG_PAL_LEN);
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}
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void affine_background_change_background(enum AffineBackgroundID new_bg)
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{
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background = new_bg;
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switch (background)
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{
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case AFFINE_BG_MAIN_MENU:
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REG_BG2CNT &= ~BG_AFF_32x32;
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REG_BG2CNT |= BG_AFF_16x16;
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memcpy32_tile8_with_palette_offset((u32*)&tile8_mem[AFFINE_BG_CBB], (const u32*)affine_main_menu_background_gfxTiles, affine_main_menu_background_gfxTilesLen/4, AFFINE_BG_PB);
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GRIT_CPY(&se_mem[AFFINE_BG_SBB], affine_main_menu_background_gfxMap);
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affine_background_load_palette(affine_main_menu_background_gfxPal);
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break;
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case AFFINE_BG_GAME:
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REG_BG2CNT &= ~BG_AFF_16x16;
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REG_BG2CNT |= BG_AFF_32x32;
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memcpy32_tile8_with_palette_offset((u32*)&tile8_mem[AFFINE_BG_CBB], (const u32*)affine_background_gfxTiles, affine_background_gfxTilesLen/4, AFFINE_BG_PB);
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GRIT_CPY(&se_mem[AFFINE_BG_SBB], affine_background_gfxMap);
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affine_background_load_palette(affine_background_gfxPal);
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break;
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}
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} |