From 6b9dee19b6cfe4bd3e98b9ab962e452789e94e83 Mon Sep 17 00:00:00 2001
From: Ulysse Cura <ulysse.cura@gmail.com>
Date: Mon, 4 May 2026 20:17:39 +0200
Subject: [PATCH] Continue implementation for SDL core

---
 core/headers/display.h      | 25 +++++++++++
 core/headers/memory_alloc.h |  6 +++
 core/headers/vector2d.h     | 86 +++++++++++++++++++++++++++++++++++++
 3 files changed, 117 insertions(+)
 create mode 100644 core/headers/display.h
 create mode 100644 core/headers/memory_alloc.h
 create mode 100644 core/headers/vector2d.h

diff --git a/core/headers/display.h b/core/headers/display.h
new file mode 100644
index 0000000..03cb94f
--- /dev/null
+++ b/core/headers/display.h
@@ -0,0 +1,25 @@
+#ifndef DISPLAY_H
+#define DISPLAY_H
+
+#include <SDL2/SDL_render.h>
+#include "vector2d.h"
+
+#define COLOR_WHITE 255, 255, 255, 255
+
+#define DISPLAY_WIDTH 396
+#define DISPLAY_HEIGHT 224
+
+extern SDL_Window *window;
+extern SDL_Renderer *renderer;
+
+void display_init(void);
+
+void display_update(void);
+
+void display_clear(void);
+
+void display_subimage(rect_t dst_rect);
+
+void display_exit(void);
+
+#endif // DISPLAY_H
\ No newline at end of file
diff --git a/core/headers/memory_alloc.h b/core/headers/memory_alloc.h
new file mode 100644
index 0000000..ef8e8b6
--- /dev/null
+++ b/core/headers/memory_alloc.h
@@ -0,0 +1,6 @@
+#ifndef MEMORY_ALLOC_H
+#define MEMORY_ALLOC_H
+
+#include <stdlib.h>
+
+#endif // MEMORY_ALLOC_H
\ No newline at end of file
diff --git a/core/headers/vector2d.h b/core/headers/vector2d.h
new file mode 100644
index 0000000..44cdf61
--- /dev/null
+++ b/core/headers/vector2d.h
@@ -0,0 +1,86 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
+*   All of the functions declared in this file and          *
+*   defined in vector2d.c are from the SDL2 source code.    *
+*   They are just modified for float and renamed.           *
+*    => https://github.com/libsdl-org/SDL                   *
+\* * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef VECTOR2D_H
+#define VECTOR2D_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * @brief Point struct.
+ *
+ * @param x     X pos
+ * @param y     Y pos
+*/
+typedef struct vector2d_t {
+    float x, y;
+} vector2d_t;
+
+/**
+ * @brief Rectangle struct.
+ *
+ * @param x     X pos
+ * @param y     Y pos
+ * @param w     Width
+ * @param h     Height
+*/
+typedef struct rect_t {
+    float x, y;
+    float w, h;
+} rect_t;
+
+#define EPSILON 0.000001f
+
+__attribute__((const)) float fabsf(float x);
+
+#define is_equal_to_zero(X) (fabsf(X) <= EPSILON)
+
+#define is_not_zero(X) (fabsf(X) > EPSILON)
+
+/**
+ * @brief Verify if a point is in a rectangle
+ *
+ * @param P     Vector2d
+ * @param R     Rectangle
+ *
+ * @return True if the point is in the rectangle, else false.
+*/
+#define point_in_rect(P, R) (((P)->x >= (R)->x) && ((P)->x < ((R)->x + (R)->w)) && \
+                             ((P)->y >= (R)->y) && ((P)->y < ((R)->y + (R)->h)))
+
+/**
+ * @brief Verify if a rectangle is empty
+ *
+ * @param R     Rectangle
+ *
+ * @return True if the rectangle is empty, else false.
+*/
+#define rect_empty(R) ((!(R)) || (is_equal_to_zero((R)->w)) || (is_equal_to_zero((R)->h)))
+
+/**
+ * @brief Verify if there is a intersction between two rectangles
+ *
+ * @param A     Rectangle A
+ * @param B     Rectangle B
+ *
+ * @return True if there is an intersection, else false.
+*/
+bool has_intersection(const rect_t *A, const rect_t *B);
+
+/**
+ * @brief Verify if there is an intersection between two rectangles and get the intersection rectangle.
+ *
+ * @param A         Rectangle A
+ * @param B         Rectangle B
+ * @param result    The intersection rectangle
+ *
+ * @return True if there is an intersection, else false.
+*/
+bool intersect_rect(const rect_t *A, const rect_t *B, rect_t *result);
+
+#endif // VECTOR2D_H
\ No newline at end of file