error in sdl native

demo/sdl_native/Makefile

@@ -0,0 +1,11 @@
+BIN = main
+CFLAGS += -std=c99 -Wall -pedantic -O0
+SRC = main.c
+LIBS = -lSDL2 -lSDL2_ttf -lSDL2_gfx -lm
+
+$(BIN): Makefile main.c nuklear_sdl.h
+	rm -f $(BIN)
+	$(CC) $(SRC) $(CFLAGS) -o $(BIN) $(LIBS)
+
+clean:
+	rm -f $(BIN)

demo/sdl_native/main.c

@@ -0,0 +1,184 @@
+/* nuklear - 1.32.0 - public domain */
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+#include <math.h>
+#include <limits.h>
+#include <time.h>
+
+#include <SDL2/SDL.h>
+
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_STANDARD_IO
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_IMPLEMENTATION
+#define NK_SDL2_IMPLEMENTATION
+#include "../../nuklear.h"
+#include "nuklear_sdl.h"
+
+#define WINDOW_WIDTH 1200
+#define WINDOW_HEIGHT 800
+
+/* ===============================================================
+ *
+ *                          EXAMPLE
+ *
+ * ===============================================================*/
+/* This are some code examples to provide a small overview of what can be
+ * done with this library. To try out an example uncomment the defines */
+#define INCLUDE_ALL
+/*#define INCLUDE_STYLE */
+/*#define INCLUDE_CALCULATOR */
+/*#define INCLUDE_OVERVIEW */
+/*#define INCLUDE_NODE_EDITOR */
+
+#ifdef INCLUDE_ALL
+  #define INCLUDE_STYLE
+  #define INCLUDE_CALCULATOR
+  #define INCLUDE_OVERVIEW
+  #define INCLUDE_NODE_EDITOR
+#endif
+
+#ifdef INCLUDE_STYLE
+  #include "../style.c"
+#endif
+#ifdef INCLUDE_CALCULATOR
+  #include "../calculator.c"
+#endif
+#ifdef INCLUDE_OVERVIEW
+  #include "../overview.c"
+#endif
+#ifdef INCLUDE_NODE_EDITOR
+  #include "../node_editor.c"
+#endif
+
+/* ===============================================================
+ *
+ *                          DEMO
+ *
+ * ===============================================================*/
+int main(int argc, char *argv[])
+{
+    /* Platform */
+    SDL_Window *win;
+    SDL_Renderer *renderer;
+    int win_width, win_height;
+    int running = 1;
+
+    /* GUI */
+    struct nk_context *ctx;
+    struct nk_colorf bg;
+
+    /* SDL setup */
+    SDL_Init(SDL_INIT_VIDEO);
+    win = SDL_CreateWindow("Demo",
+        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+        WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_SHOWN|SDL_WINDOW_ALLOW_HIGHDPI);
+    renderer = SDL_CreateRenderer(win, -1, 0);
+    SDL_GetWindowSize(win, &win_width, &win_height);
+
+    /* GUI */
+    nk_sdl_font_create_from_file("../../extra_font/Cousine-Regular.ttf", 13, 0);
+
+    ctx = nk_sdl_init(win, renderer);
+
+    /* Load Fonts: if none of these are loaded a default font will be used  */
+    /* Load Cursor: if you uncomment cursor loading please hide the cursor */
+    // {struct nk_font_atlas *atlas;
+    // nk_sdl_font_stash_begin(&atlas);
+    /*struct nk_font *droid = nk_font_atlas_add_from_file(atlas, "../../../extra_font/DroidSans.ttf", 14, 0);*/
+    /*struct nk_font *roboto = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Roboto-Regular.ttf", 16, 0);*/
+    /*struct nk_font *future = nk_font_atlas_add_from_file(atlas, "../../../extra_font/kenvector_future_thin.ttf", 13, 0);*/
+    /*struct nk_font *clean = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyClean.ttf", 12, 0);*/
+    /*struct nk_font *tiny = nk_font_atlas_add_from_file(atlas, "../../../extra_font/ProggyTiny.ttf", 10, 0);*/
+    /*struct nk_font *cousine = nk_font_atlas_add_from_file(atlas, "../../../extra_font/Cousine-Regular.ttf", 13, 0);*/
+    // nk_sdl_font_stash_end();
+    /*nk_style_load_all_cursors(ctx, atlas->cursors);*/
+    /*nk_style_set_font(ctx, &roboto->handle) ;}*/
+
+    #ifdef INCLUDE_STYLE
+    /*set_style(ctx, THEME_WHITE);*/
+    /*set_style(ctx, THEME_RED);*/
+    /*set_style(ctx, THEME_BLUE);*/
+    /*set_style(ctx, THEME_DARK);*/
+    #endif
+
+    bg.r = 10, bg.g = 18, bg.b = 24, bg.a = 255;
+    while (running)
+    {
+        /* Input */
+        SDL_Event evt;
+        nk_input_begin(ctx);
+        while (SDL_PollEvent(&evt)) {
+            if (evt.type == SDL_QUIT) goto cleanup;
+            nk_sdl_handle_event(&evt);
+        }
+        nk_input_end(ctx);
+
+        /* GUI */
+        if (nk_begin(ctx, "Demo", nk_rect(50, 50, 230, 250),
+            NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
+            NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
+        {
+            enum {EASY, HARD};
+            static int op = EASY;
+            static int property = 20;
+
+            nk_layout_row_static(ctx, 30, 80, 1);
+            if (nk_button_label(ctx, "button"))
+                fprintf(stdout, "button pressed\n");
+            nk_layout_row_dynamic(ctx, 30, 2);
+            if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
+            if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;
+            nk_layout_row_dynamic(ctx, 25, 1);
+            nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
+
+            nk_layout_row_dynamic(ctx, 20, 1);
+            nk_label(ctx, "background:", NK_TEXT_LEFT);
+            nk_layout_row_dynamic(ctx, 25, 1);
+            if (nk_combo_begin_color(ctx, nk_rgb_cf(bg), nk_vec2(nk_widget_width(ctx),400))) {
+                nk_layout_row_dynamic(ctx, 120, 1);
+                bg = nk_color_picker(ctx, bg, NK_RGBA);
+                nk_layout_row_dynamic(ctx, 25, 1);
+                bg.r = nk_propertyi(ctx, "#R:", 0, bg.r, 255, 1, 1);
+                bg.g = nk_propertyi(ctx, "#G:", 0, bg.g, 255, 1, 1);
+                bg.b = nk_propertyi(ctx, "#B:", 0, bg.b, 255, 1, 1);
+                bg.a = nk_propertyi(ctx, "#A:", 0, bg.a, 255, 1, 1);
+                nk_combo_end(ctx);
+            }
+        }
+        nk_end(ctx);
+
+        /* -------------- EXAMPLES ---------------- */
+        #ifdef INCLUDE_CALCULATOR
+          calculator(ctx);
+        #endif
+        #ifdef INCLUDE_OVERVIEW
+          overview(ctx);
+        #endif
+        #ifdef INCLUDE_NODE_EDITOR
+          node_editor(ctx);
+        #endif
+        /* ----------------------------------------- */
+
+        /* Draw */
+        SDL_SetRenderDrawColor(renderer, bg.r, bg.g, bg.b, bg.a);
+        SDL_RenderClear(renderer);
+
+        nk_sdl_render();
+
+        SDL_RenderPresent(renderer);
+    }
+
+cleanup:
+    nk_sdl_shutdown();
+    SDL_DestroyWindow(win);
+    SDL_Quit();
+    return 0;
+}
+