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Nuklear/demo/glfw_opengl4/main.c

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/* 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 <limits.h>
#include <time.h>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#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_GLFW_GL4_IMPLEMENTATION
#define NK_KEYSTATE_BASED_INPUT
#include "../../nuklear.h"
#include "nuklear_glfw_gl4.h"
#define WINDOW_WIDTH 1200
#define WINDOW_HEIGHT 800
#define MAX_VERTEX_BUFFER 512 * 1024
#define MAX_ELEMENT_BUFFER 128 * 1024
/* ===============================================================
*
* 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_CANVAS */
/*#define INCLUDE_OVERVIEW */
/*#define INCLUDE_NODE_EDITOR */
#ifdef INCLUDE_ALL
#define INCLUDE_STYLE
#define INCLUDE_CALCULATOR
#define INCLUDE_CANVAS
#define INCLUDE_OVERVIEW
#define INCLUDE_NODE_EDITOR
#endif
#ifdef INCLUDE_STYLE
#include "../../demo/common/style.c"
#endif
#ifdef INCLUDE_CALCULATOR
#include "../../demo/common/calculator.c"
#endif
#ifdef INCLUDE_CANVAS
#include "../../demo/common/canvas.c"
#endif
#ifdef INCLUDE_OVERVIEW
#include "../../demo/common/overview.c"
#endif
#ifdef INCLUDE_NODE_EDITOR
#include "../../demo/common/node_editor.c"
#endif
/* ===============================================================
*
* DEMO
*
* ===============================================================*/
static void error_callback(int e, const char *d)
{printf("Error %d: %s\n", e, d);}
int main(void)
{
/* Platform */
static GLFWwindow *win;
int width = 0, height = 0;
struct nk_context *ctx;
struct nk_colorf bg;
struct nk_image img;
/* GLFW */
glfwSetErrorCallback(error_callback);
if (!glfwInit()) {
fprintf(stdout, "[GFLW] failed to init!\n");
exit(1);
}
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
win = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Demo", NULL, NULL);
glfwMakeContextCurrent(win);
glfwGetWindowSize(win, &width, &height);
/* OpenGL */
glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
glewExperimental = 1;
if (glewInit() != GLEW_OK) {
fprintf(stderr, "Failed to setup GLEW\n");
exit(1);
}
ctx = nk_glfw3_init(win, NK_GLFW3_INSTALL_CALLBACKS, MAX_VERTEX_BUFFER, MAX_ELEMENT_BUFFER);
/* 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_glfw3_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_glfw3_font_stash_end();
/*nk_style_load_all_cursors(ctx, atlas->cursors);*/
/*nk_style_set_font(ctx, &droid->handle);*/}
/* Create bindless texture.
* The index returned is not the opengl resource id.
* IF you need the GL resource id use: nk_glfw3_get_tex_ogl_id() */
{int tex_index = 0;
enum {tex_width = 256, tex_height = 256};
char pixels[tex_width * tex_height * 4];
memset(pixels, 128, sizeof(pixels));
tex_index = nk_glfw3_create_texture(pixels, tex_width, tex_height);
img = nk_image_id(tex_index);}
bg.r = 0.10f, bg.g = 0.18f, bg.b = 0.24f, bg.a = 1.0f;
while (!glfwWindowShouldClose(win))
{
/* Input */
glfwPollEvents();
nk_glfw3_new_frame();
/* 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_propertyf(ctx, "#R:", 0, bg.r, 1.0f, 0.01f,0.005f);
bg.g = nk_propertyf(ctx, "#G:", 0, bg.g, 1.0f, 0.01f,0.005f);
bg.b = nk_propertyf(ctx, "#B:", 0, bg.b, 1.0f, 0.01f,0.005f);
bg.a = nk_propertyf(ctx, "#A:", 0, bg.a, 1.0f, 0.01f,0.005f);
nk_combo_end(ctx);
}
}
nk_end(ctx);
/* Bindless Texture */
if (nk_begin(ctx, "Texture", nk_rect(250, 150, 230, 250),
NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
{
struct nk_command_buffer *canvas = nk_window_get_canvas(ctx);
struct nk_rect total_space = nk_window_get_content_region(ctx);
nk_draw_image(canvas, total_space, &img, nk_white);
}
nk_end(ctx);
/* -------------- EXAMPLES ---------------- */
#ifdef INCLUDE_CALCULATOR
calculator(ctx);
#endif
#ifdef INCLUDE_CANVAS
canvas(ctx);
#endif
#ifdef INCLUDE_OVERVIEW
overview(ctx);
#endif
#ifdef INCLUDE_NODE_EDITOR
node_editor(ctx);
#endif
/* ----------------------------------------- */
/* Draw */
glfwGetWindowSize(win, &width, &height);
glViewport(0, 0, width, height);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(bg.r, bg.g, bg.b, bg.a);
/* IMPORTANT: `nk_glfw_render` modifies some global OpenGL state
* with blending, scissor, face culling, depth test and viewport and
* defaults everything back into a default state.
* Make sure to either a.) save and restore or b.) reset your own state after
* rendering the UI. */
nk_glfw3_render(NK_ANTI_ALIASING_ON);
glfwSwapBuffers(win);
}
nk_glfw3_shutdown();
glfwTerminate();
return 0;
}
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