Initial commit

src/engine/renderer.h

@@ -0,0 +1,46 @@
+#ifndef JNR_RENDERER_H
+#define JNR_RENDERER_H
+
+#include <SDL2/SDL.h>
+#include <stdbool.h>
+#include "config.h"
+#include "util/vec2.h"
+
+/* Forward declaration */
+typedef struct Camera Camera;
+
+typedef enum DrawLayer {
+    LAYER_BG_FAR,       /* parallax background - far  */
+    LAYER_BG_NEAR,      /* parallax background - near */
+    LAYER_TILES_BG,     /* tile background layer      */
+    LAYER_ENTITIES,     /* players, enemies, items    */
+    LAYER_TILES_FG,     /* tile foreground layer      */
+    LAYER_PARTICLES,    /* effects                    */
+    LAYER_HUD,          /* UI overlay (screen-space)  */
+    LAYER_COUNT
+} DrawLayer;
+
+typedef struct Sprite {
+    SDL_Texture *texture;
+    SDL_Rect     src;       /* source rect in spritesheet       */
+    Vec2         pos;       /* world position (top-left)        */
+    Vec2         size;      /* render size in world pixels      */
+    bool         flip_x;
+    bool         flip_y;
+    DrawLayer    layer;
+    uint8_t      alpha;     /* 0-255                            */
+    double       rotation;  /* degrees, clockwise               */
+} Sprite;
+
+void renderer_init(SDL_Renderer *r);
+void renderer_set_clear_color(SDL_Color color);
+void renderer_clear(void);
+void renderer_submit(const Sprite *sprite);
+void renderer_flush(const Camera *cam);
+void renderer_present(void);
+void renderer_shutdown(void);
+
+/* Convenience: draw a filled rect (debug / HUD) */
+void renderer_draw_rect(Vec2 pos, Vec2 size, SDL_Color color, DrawLayer layer, const Camera *cam);
+
+#endif /* JNR_RENDERER_H */