From 9942429dbb83fed5532c070f8afe41d6ddcd66d2 Mon Sep 17 00:00:00 2001
From: zlago
Date: Wed, 25 Sep 2024 14:02:49 +0200
Subject: parallax

---
 src/tilemap.c | 132 +++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 85 insertions(+), 47 deletions(-)

(limited to 'src/tilemap.c')

diff --git a/src/tilemap.c b/src/tilemap.c
index a63cef5..3f19f0e 100644
--- a/src/tilemap.c
+++ b/src/tilemap.c
@@ -7,7 +7,9 @@
 #include "loader.h"
 #include "main.h"
 
-SDL_Texture *tilemap_tileset = NULL, *tilemap_wang_tileset = NULL, *tilemap_tilemap = NULL;
+#include "tilemap.h"
+
+struct tilemap *tilemap = NULL, *next_tilemap = NULL;
 
 #define PACKED __attribute__((__packed__))
 
@@ -23,25 +25,37 @@ struct PACKED map {
 	uint8_t tiles[];
 };
 
-void init_tilemap(void) {
-	tilemap_tileset = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, 128, 128);
-	tilemap_wang_tileset = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, 128, 128);
-	SDL_SetTextureBlendMode(tilemap_wang_tileset, SDL_BLENDMODE_BLEND);
+void free_tilemap(struct tilemap *tilemap) {
+	SDL_DestroyTexture(tilemap->tileset);
+	SDL_DestroyTexture(tilemap->wang_tileset);
+	free(tilemap->parallax);
+	free(tilemap->collision);
+	for (int i = 0; i < tilemap->layers; i++) {
+		SDL_DestroyTexture(tilemap->tilemaps[i]);
+	}
+	free(tilemap->tilemaps);
+	free(tilemap);
 }
 
-void free_tilemap(void) {
-	SDL_DestroyTexture(tilemap_tileset), tilemap_tileset = NULL;
-	SDL_DestroyTexture(tilemap_wang_tileset), tilemap_wang_tileset = NULL;
-	SDL_DestroyTexture(tilemap_tilemap), tilemap_tilemap = NULL;
-}
+struct tilemap *load_tilemap(void const *data, size_t size) {
+	struct tilemap *tilemap = malloc(sizeof (struct tilemap));
+	if (tilemap == NULL) {
+		return NULL;
+	}
+	tilemap->tileset = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, 128, 128);
+	tilemap->wang_tileset = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, 128, 128);
+	SDL_SetTextureBlendMode(tilemap->wang_tileset, SDL_BLENDMODE_BLEND);
+	tilemap->layers = 0;
+	tilemap->parallax = NULL;
+	tilemap->collision = NULL;
+	tilemap->tilemaps = NULL;
 
-int load_tilemap(void const *data, size_t size) {
 	struct sets const *const sets = data;
 	data = sets + 1;
 	size -= sizeof (struct sets);
 	char const *str = data;
 	int y = 0;
-	SDL_SetRenderTarget(renderer, tilemap_tileset);
+	SDL_SetRenderTarget(renderer, tilemap->tileset);
 	SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
 	SDL_RenderClear(renderer);
 
@@ -50,20 +64,18 @@ int load_tilemap(void const *data, size_t size) {
 		str += sizeof (uint32_t);
 		size_t len = strnlen(str, size);
 		if (len == size) {
-			return 1;
+			goto fail;
 		}
 		void *tex = res_get_texture(str).data;
 		
-		//printf("%u %u\n", y, height);
 		SDL_RenderCopy(renderer, tex, &(SDL_Rect) {0, 0, 128, height}, &(SDL_Rect) {0, y, 128, height});
 		
-		//printf("%s %u\n", str, tex);
 		y += height;
 		str += len + 1;
 		size -= len + 4 + 1;
 	}
 	
-	SDL_SetRenderTarget(renderer, tilemap_wang_tileset);
+	SDL_SetRenderTarget(renderer, tilemap->wang_tileset);
 	SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
 	SDL_RenderClear(renderer);
 
@@ -72,54 +84,80 @@ int load_tilemap(void const *data, size_t size) {
 		str += sizeof (uint32_t);
 		size_t len = strnlen(str, size);
 		if (len == size) {
-			return 1;
+			free_tilemap(tilemap);
+			return NULL;
 		}
 		void *tex = res_get_texture(str).data;
 		
-		//printf("%u %u\n", y, height);
 		SDL_RenderCopy(renderer, tex, &(SDL_Rect) {0, 0, 128, height}, &(SDL_Rect) {0, 0, 128, height});
 
-		//printf("%s %u\n", str, tex);
 		str += len + 1;
 		size -= len + 4 + 1;
 	}
 	
 	struct map const *const map = (void *) str;
-	if (map->width * map->height * map->layers != size - sizeof (struct map)) {
-		return 1;
+	if (map->width * map->height * map->layers > size - sizeof (struct map)) {
+		goto fail;
 	}
+
+	tilemap->width = map->width;
+	tilemap->height = map->height;
+	tilemap->layers = map->layers;
+	tilemap->tilemaps = malloc(sizeof (void *) * tilemap->layers);
 	
-	SDL_Texture *tilemap = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, map->width * 8, map->height * 8);
-	SDL_SetTextureBlendMode(tilemap, SDL_BLENDMODE_BLEND);
-	SDL_SetRenderTarget(renderer, tilemap);
-
-	for (int y = 0; y < map->height; y++) {
-		for (int x = 0; x < map->width; x++) {
-			unsigned tile = map->tiles[x + map->width * y];
-			int tileX = tile & 0x0f;
-			int tileY = tile >> 4;
-			SDL_RenderCopy(renderer, tilemap_tileset, &(SDL_Rect) {tileX * 8, tileY * 8, 8, 8}, &(SDL_Rect) {x * 8, y * 8, 8, 8});
+	for (int l = 0; l < tilemap->layers; l++) {
+		SDL_Texture *layer = SDL_CreateTexture(renderer, SDL_PIXELTYPE_UNKNOWN, SDL_TEXTUREACCESS_TARGET, map->width * 8, map->height * 8);
+		SDL_SetTextureBlendMode(layer, SDL_BLENDMODE_BLEND);
+		SDL_SetRenderTarget(renderer, layer);
+		
+		size_t const ll = l * map->width * map->height;
+		for (int y = 0; y < map->height; y++) {
+			size_t const yy = y * map->width;
+			for (int x = 0; x < map->width; x++) {
+				unsigned tile = map->tiles[x + yy + ll];
+				int tileX = tile & 0x0f;
+				int tileY = tile >> 4;
+				SDL_RenderCopy(renderer, tilemap->tileset, &(SDL_Rect) {tileX * 8, tileY * 8, 8, 8}, &(SDL_Rect) {x * 8, y * 8, 8, 8});
+			}
 		}
-	}
-
-	for (int tile = 0xf0; tile < 0x100; tile++) {
-		for (int y = 0; y < map->height - 1; y++) {
-			for (int x = 0; x < map->width - 1; x++) {
-				int tl = map->tiles[x + map->width * y] == tile;
-				int tr = map->tiles[x + 1 + map->width * y] == tile;
-				int bl = map->tiles[x + map->width * (y + 1)] == tile;
-				int br = map->tiles[x + 1 + map->width * (y + 1)] == tile;
-				//int tileX = tl << 3 | tr << 2 | bl << 1 | br << 0;
-				int tileX = tl << 0 | tr << 1 | bl << 2 | br << 3;
-				int tileY = tile & 0x0f;
-				SDL_RenderCopy(renderer, tilemap_wang_tileset, &(SDL_Rect) {tileX * 8, tileY * 8, 8, 8}, &(SDL_Rect) {x * 8 + 4, y * 8 + 4, 8, 8});
+		
+		for (int tile = 0xf0; tile < 0x100; tile++) {
+			for (int y = 0; y < map->height - 1; y++) {
+				size_t const yy = y * map->width;
+				for (int x = 0; x < map->width - 1; x++) {
+					int tl = map->tiles[x + yy + ll] == tile;
+					int tr = map->tiles[x + 1 + yy + ll] == tile;
+					int bl = map->tiles[x + yy + map->width + ll] == tile;
+					int br = map->tiles[x + 1 + yy + map->width + ll] == tile;
+					int tileX = tl << 0 | tr << 1 | bl << 2 | br << 3;
+					int tileY = tile & 0x0f;
+					SDL_RenderCopy(renderer, tilemap->wang_tileset, &(SDL_Rect) {tileX * 8, tileY * 8, 8, 8}, &(SDL_Rect) {x * 8 + 4, y * 8 + 4, 8, 8});
+				}
 			}
 		}
-	}
 
-	SDL_DestroyTexture(tilemap_tilemap), tilemap_tilemap = tilemap;
+		tilemap->tilemaps[l] = layer;
+	}
+	
+	float *parallax = (void *) (map->tiles + map->width * map->height * map->layers);
+	size -= (char *) parallax - (char *) map;
+	if (sizeof (struct parallax) * map->layers > size) {
+		goto fail;
+	}
+	
+	tilemap->parallax = malloc(sizeof (struct parallax) * map->layers);
+	for (int i = 0; i < map->layers; i++) {
+		tilemap->parallax[i].x = *parallax++;
+		tilemap->parallax[i].y = *parallax++;
+	}
 
+	size -= sizeof (struct parallax) * map->layers;
+	
 	SDL_SetRenderTarget(renderer, NULL);
+	return tilemap;
 	
-	return 0;
+	fail:
+	free_tilemap(tilemap);
+	SDL_SetRenderTarget(renderer, NULL);
+	return NULL;
 }
-- 
cgit 1.4.1-2-gfad0