Nuklear/demo/sfml_opengl3/main.cpp

/* nuklear - v1.32.0 - 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 <SFML/Window.hpp>

#define NK_INCLUDE_FIXED_TYPES
#define NK_INCLUDE_STANDARD_IO
#define NK_INCLUDE_STANDARD_VARARGS
#define NK_INCLUDE_DEFAULT_ALLOCATOR
#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
#define NK_INCLUDE_FONT_BAKING
#define NK_INCLUDE_DEFAULT_FONT
#define NK_IMPLEMENTATION
#define NK_SFML_GL3_IMPLEMENTATION
#include "../../nuklear.h"
#include "nuklear_sfml_gl3.h"

#define WINDOW_WIDTH 1200
#define WINDOW_HEIGHT 800

#define MAX_VERTEX_BUFFER 512 * 1024
#define MAX_ELEMENT_BUFFER 128 * 1024

#define UNUSED(a) (void)a
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a)/sizeof(a)[0])

/* ===============================================================
 *
 *                          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 include
 * and the corresponding function. */
/*#include "../style.c"*/
/*#include "../calculator.c"*/
/*#include "../overview.c"*/
/*#include "../node_editor.c"*/

/* ===============================================================
 *
 *                          DEMO
 *
 * ===============================================================*/
int main(void)
{
    /* Platform */
    sf::ContextSettings settings(24, 8, 4, 3, 3);
    sf::Window window(sf::VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), "Demo", sf::Style::Default, settings);

    window.setVerticalSyncEnabled(true);
    window.setActive(true);

    /* Load OpenGL extensions */
    if(!gladLoadGL())
    {
        printf("Failed to load OpenGL extensions!\n");
        return -1;
    }

    glViewport(0, 0, window.getSize().x, window.getSize().y);
    struct nk_context *ctx;
    struct nk_color background;

    /* GUI */
    ctx = nk_sfml_init(&window);
    /* 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_sfml_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", 14, 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_sfml_font_stash_end();
        /*nk_style_load_all_cursors(ctx, atlas->cursors);*/
        /*nk_style_set_font(ctx, &droid->handle);*/
    }

    /* style.c */
    /*set_style(ctx, THEME_WHITE);*/
    /*set_style(ctx, THEME_RED);*/
    /*set_style(ctx, THEME_BLUE);*/
    /*set_style(ctx, THEME_DARK);*/

    background = nk_rgb(28,48,62);

    while (window.isOpen())
    {
        /* Input */
        sf::Event event;

        nk_input_begin(ctx);
        while(window.pollEvent(event))
        {
            if(event.type == sf::Event::Closed)
                window.close();
            else if(event.type == sf::Event::Resized)
                glViewport(0, 0, event.size.width, event.size.height);

            nk_sfml_handle_event(&event);
        }
        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, background, nk_vec2(nk_widget_width(ctx),400))) {
                nk_layout_row_dynamic(ctx, 120, 1);
                background = nk_color_picker(ctx, background, NK_RGBA);
                nk_layout_row_dynamic(ctx, 25, 1);
                background.r = (nk_byte)nk_propertyi(ctx, "#R:", 0, background.r, 255, 1,1);
                background.g = (nk_byte)nk_propertyi(ctx, "#G:", 0, background.g, 255, 1,1);
                background.b = (nk_byte)nk_propertyi(ctx, "#B:", 0, background.b, 255, 1,1);
                background.a = (nk_byte)nk_propertyi(ctx, "#A:", 0, background.a, 255, 1,1);
                nk_combo_end(ctx);
            }
        }
        nk_end(ctx);

        /* -------------- EXAMPLES ---------------- */
        /*calculator(ctx);*/
        /*overview(ctx);*/
        /*node_editor(ctx);*/
        /* ----------------------------------------- */

        /* Draw */
        {
            window.setActive(true);

            float bg[4];
            nk_color_fv(bg, background);
            glClear(GL_COLOR_BUFFER_BIT);
            glClearColor(bg[0], bg[1], bg[2], bg[3]);
            
            /* IMPORTANT: `nk_sfml_render` modifies some global OpenGL state
            * with blending, scissor, face culling and depth test and defaults everything
            * back into a default state. Make sure to either save and restore or
            * reset your own state after drawing rendering the UI. */
            nk_sfml_render(NK_ANTI_ALIASING_ON, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
            
            window.display();
        }
    }

    nk_sfml_shutdown();
    return 0;
}