rewrite and port to SDL3

1 files changed, 44 insertions, 0 deletions

diff --git a/src/memory.h b/src/memory.h
new file mode 100644
index 0000000..b472d31
--- /dev/null
+++ b/src/memory.h
@@ -0,0 +1,44 @@
+#ifndef MEMORY_H
+#define MEMORY_H
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <SDL3/SDL.h>
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE 4096
+#endif
+
+#ifndef PAGE_WIDTH
+#define PAGE_WIDTH 256
+#endif
+#define PAGE_HEIGHT (PAGE_SIZE * CHAR_BIT / PAGE_WIDTH)
+
+typedef struct page {
+	struct page_list *l;
+	uintptr_t address;
+	SDL_Texture *tex;
+	uint64_t hash;
+	bool in_use;
+	struct page *next;
+} page;
+
+typedef struct page_list {
+	int fd;
+	page *first;
+} page_list;
+
+uintptr_t to_addr(int x, int y);
+void to_pos(uintptr_t addr, int *x, int *y);
+
+int init_page_list(page_list *l, int fd);
+page *get_page(page_list *l, uintptr_t addr);
+void free_unused_pages(page_list *l);
+SDL_Texture *get_texture(page *p);
+void free_page_list(page_list *l);
+
+void draw_line(page_list *l,
+		double x1, double y1, double x2, double y2, bool bit);
+#endif