NotAShelf
ceb657add8
Signed-off-by: NotAShelf <raf@notashelf.dev> Change-Id: I7b6991f7342362033ad72ab4700fdb9f6a6a6964
118 lines
3 KiB
C
118 lines
3 KiB
C
#include "tileset.h"
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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int tileset_init(Tileset *ts, int tile_w, int tile_h) {
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if (ts == NULL)
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return 0;
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if (tile_w <= 0 || tile_h <= 0)
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return 0;
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memset(ts, 0, sizeof(Tileset));
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ts->tile_w = tile_w;
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ts->tile_h = tile_h;
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// Compute grid dimensions to fit MAX_TILE_ID tiles
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ts->atlas_cols = 4; // 4 columns
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ts->atlas_rows = (MAX_TILE_ID + ts->atlas_cols - 1) / ts->atlas_cols; // round up
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int atlas_w = ts->atlas_cols * tile_w;
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int atlas_h = ts->atlas_rows * tile_h;
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// Validate atlas dimensions are reasonable
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if (atlas_w <= 0 || atlas_h <= 0 || atlas_w > 4096 || atlas_h > 4096)
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return 0;
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ts->render_target = LoadRenderTexture(atlas_w, atlas_h);
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if (!IsRenderTextureValid(ts->render_target))
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return 0;
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// Clear to transparent so unpainted regions don't show artifacts
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BeginTextureMode(ts->render_target);
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ClearBackground(BLANK);
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EndTextureMode();
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ts->finalized = 0;
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ts->tile_count = 0;
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return 1;
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}
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int tileset_register(Tileset *ts, int id) {
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if (ts == NULL)
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return 0;
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if (id < 0 || id >= MAX_TILE_ID)
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return 0;
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if (ts->render_target.id == 0)
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return 0;
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if (ts->finalized)
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return 0;
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if (ts->regions[id].width != 0)
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return 0; // already registered
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int col = id % ts->atlas_cols;
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int row = id / ts->atlas_cols;
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ts->regions[id] =
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(Rectangle){(float)(col * ts->tile_w), (float)(row * ts->tile_h), (float)ts->tile_w, (float)ts->tile_h};
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ts->tile_count++;
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return 1;
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}
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int tileset_finalize(Tileset *ts) {
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if (ts == NULL)
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return 0;
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if (ts->render_target.id == 0)
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return 0;
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if (ts->finalized)
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return 1; // already finalized
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// Convert RenderTexture to regular Texture2D
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// RenderTexture textures are flipped vertically in raylib, so we need to handle that
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Texture2D old_texture = ts->render_target.texture;
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// Create a new texture from the render texture data
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Image img = LoadImageFromTexture(old_texture);
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if (img.data == NULL) {
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return 0;
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}
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// Flip image vertically because RenderTexture is upside-down
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ImageFlipVertical(&img);
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Texture2D new_tex = LoadTextureFromImage(img);
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UnloadImage(img);
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if (new_tex.id == 0) {
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return 0;
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}
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// Unload the old render texture and replace with the new regular texture
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UnloadRenderTexture(ts->render_target);
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ts->render_target.id = 0;
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ts->atlas = new_tex;
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ts->finalized = 1;
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return 1;
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}
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Rectangle tileset_get_region(const Tileset *ts, int id) {
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if (ts == NULL || id < 0 || id >= MAX_TILE_ID)
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return (Rectangle){0, 0, 0, 0};
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if (!ts->finalized)
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return (Rectangle){0, 0, 0, 0};
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return ts->regions[id];
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}
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void tileset_destroy(Tileset *ts) {
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if (ts == NULL)
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return;
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if (ts->finalized) {
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if (ts->atlas.id != 0)
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UnloadTexture(ts->atlas);
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} else {
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if (ts->render_target.id != 0)
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UnloadRenderTexture(ts->render_target);
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}
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memset(ts, 0, sizeof(Tileset));
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}
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