56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
#include "affine_background.h"
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#include "affine_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 = {32<<8, 64<<8, 120, 80, 0x0100, 0x0100, 0};
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void affine_background_init()
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{
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memcpy16_tile8_with_palette_offset(&tile8_mem[AFFINE_BG_CBB], affine_background_gfxTiles, affine_background_gfxTilesLen/2, AFFINE_BG_PB);
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GRIT_CPY(&se_mem[AFFINE_BG_SBB], affine_background_gfxMap);
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memcpy16(&pal_bg_mem[AFFINE_BG_PB], affine_background_gfxPal, AFFINE_BG_PAL_LEN);
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bgaff = bg_aff_default;
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affine_background_set_color(AFFINE_BG_DEFAULT_COLOR);
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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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// These values are not permament, just the current configuration for the affine background
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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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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_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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COLOR old_color;
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memcpy16(&old_color, &pal_bg_mem[AFFINE_BG_PB] + i, 1); // Copy the color from the background palette
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int r, g, b;
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r = (old_color & RED_MASK) >> RED_SHIFT; // Extract red component
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g = (old_color & GREEN_MASK) >> GREEN_SHIFT; // Extract green component
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b = (old_color & BLUE_MASK) >> BLUE_SHIFT; // Extract blue component
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int brightness = (r + g + b) / 3; // Calculate brightness
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const float brightness_divergence = 0.03f; // The difference in brightness between each color in the palette
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const float brightness_modifier = -0.4f; // The overall brightness modifier for the palette
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clr_adj_brightness(&pal_bg_mem[AFFINE_BG_PB] + i, &color, 1, float2fx(brightness_modifier + (brightness * brightness_divergence))); // Adjust brightness for the palette colors
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}
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} |