73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
#include <tonc_core.h>
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#include <tonc_tte.h>
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#include <tonc_math.h>
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#include "graphic_utils.h"
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const Rect FULL_SCREENBLOCK_RECT = { 0, 0, SE_ROW_LEN, SE_COL_LEN };
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// Clips a rect of screenblock entries to a specified rect
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static void clip_se_rect_to_bounding_rect(Rect* rect, const Rect* bounding_rect)
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{
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rect->right = min(rect->right, bounding_rect->right);
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rect->bottom = min(rect->bottom, bounding_rect->bottom);
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rect->left = max(rect->left, bounding_rect->left);
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rect->top = max(rect->top, bounding_rect->top);
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}
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// Can be unstaticed if needed
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// Clips a rect of screenblock entries to screenblock boundaries
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// The bounding rect is not required to be within screenblock boundaries
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static void clip_se_rect_to_screenblock(Rect* rect)
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{
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clip_se_rect_to_bounding_rect(rect, &FULL_SCREENBLOCK_RECT);
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}
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void main_bg_se_clear_rect(Rect se_rect)
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{
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if (se_rect.left > se_rect.right)
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return;
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// Clip to avoid screenblock overflow
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clip_se_rect_to_screenblock(&se_rect);
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for (int y = se_rect.top; y < se_rect.bottom; y++)
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{
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memset16(&(se_mem[MAIN_BG_SBB][se_rect.left + SE_ROW_LEN * y]), 0x0000, se_rect.right - se_rect.left + 1);
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}
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}
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void main_bg_se_copy_rect_1_tile_vert(Rect se_rect, int direction)
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{
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if (se_rect.left > se_rect.right
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|| (direction != SE_UP && direction != SE_DOWN))
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return;
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// Clip to avoid read/write overflow of the screenblock
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Rect bounding_rect = FULL_SCREENBLOCK_RECT;
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bounding_rect.top = 1;
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bounding_rect.bottom = SE_COL_LEN - 1;
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clip_se_rect_to_bounding_rect(&se_rect, &bounding_rect);
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int start = (direction == SE_UP) ? se_rect.top : se_rect.bottom;
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int end = (direction == SE_UP) ? se_rect.bottom : se_rect.top;
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for (int y = start; y != end - direction; y -= direction)
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{
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memcpy16(&se_mem[MAIN_BG_SBB][se_rect.left + SE_ROW_LEN * (y + direction)],
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&se_mem[MAIN_BG_SBB][se_rect.left + SE_ROW_LEN * y],
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se_rect.right - se_rect.left + 1);
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}
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if (direction == SE_DOWN)
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{
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memset16(&se_mem[MAIN_BG_SBB][se_rect.left + SE_ROW_LEN * (end)], 0x0000, se_rect.right - se_rect.left + 1); // This clears the top row when going down, or the bottom row when going up.
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}
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}
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void tte_erase_rect_wrapper(Rect rect)
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{
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tte_erase_rect(rect.left, rect.top, rect.right, rect.bottom);
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}
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