text: /*
   * Nuklear - 1.32.0 - public domain
   * no warrenty implied; use at your own risk.
   * authored from 2015-2016 by Micha Mettke
   */
  /*
   * ==============================================================
   *
   *                              API
   *
   * ===============================================================
   */
  #ifndef NK_GLFW_GL3_H_
  #define NK_GLFW_GL3_H_
  
  #include "glfw/glfw3.h"
  
  enum nk_glfw_init_state{
      NK_GLFW3_DEFAULT=0,
      NK_GLFW3_INSTALL_CALLBACKS
  };
  
  #ifndef NK_GLFW_TEXT_MAX
  #define NK_GLFW_TEXT_MAX 256
  #endif
  
  struct nk_glfw_device {
      struct nk_buffer cmds;
      struct nk_draw_null_texture null;
      GLuint vbo, vao, ebo;
      GLuint prog;
      GLuint vert_shdr;
      GLuint frag_shdr;
      GLint attrib_pos;
      GLint attrib_uv;
      GLint attrib_col;
      GLint uniform_tex;
      GLint uniform_proj;
      GLuint font_tex;
  };
  
  struct nk_glfw {
      GLFWwindow *win;
      int width, height;
      int display_width, display_height;
      struct nk_glfw_device ogl;
      struct nk_context ctx;
      struct nk_font_atlas atlas;
      struct nk_vec2 fb_scale;
      unsigned int text[NK_GLFW_TEXT_MAX];
      int text_len;
      struct nk_vec2 scroll;
      double last_button_click;
      int is_double_click_down;
      struct nk_vec2 double_click_pos;
  };
  
  NK_API struct nk_context*   nk_glfw3_init(struct nk_glfw* glfw, GLFWwindow *win, enum nk_glfw_init_state);
  NK_API void                 nk_glfw3_shutdown(struct nk_glfw* glfw);
  NK_API void                 nk_glfw3_font_stash_begin(struct nk_glfw* glfw, struct nk_font_atlas **atlas);
  NK_API void                 nk_glfw3_font_stash_end(struct nk_glfw* glfw);
  NK_API void                 nk_glfw3_new_frame(struct nk_glfw* glfw);
  NK_API void                 nk_glfw3_render(struct nk_glfw* glfw, enum nk_anti_aliasing, int max_vertex_buffer, int max_element_buffer);
  
  NK_API void                 nk_glfw3_device_destroy(struct nk_glfw* glfw);
  NK_API void                 nk_glfw3_device_create(struct nk_glfw* glfw);
  
  NK_API void                 nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint);
  NK_API void                 nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff);
  NK_API void                 nk_glfw3_mouse_button_callback(GLFWwindow *win, int button, int action, int mods);
  
  #endif
  /*
   * ==============================================================
   *
   *                          IMPLEMENTATION
   *
   * ===============================================================
   */
  #ifdef NK_GLFW_GL3_IMPLEMENTATION
  
  #ifndef NK_GLFW_DOUBLE_CLICK_LO
  #define NK_GLFW_DOUBLE_CLICK_LO 0.02
  #endif
  #ifndef NK_GLFW_DOUBLE_CLICK_HI
  #define NK_GLFW_DOUBLE_CLICK_HI 0.2
  #endif
  
  struct nk_glfw_vertex {
      float position[2];
      float uv[2];
      nk_byte col[4];
  };
  
  #ifdef __APPLE__
    #define NK_SHADER_VERSION "#version 150\n"
  #else
    #define NK_SHADER_VERSION "#version 300 es\n"
  #endif
  
  NK_API void
  nk_glfw3_device_create(struct nk_glfw* glfw)
  {
      GLint status;
      static const GLchar *vertex_shader =
          NK_SHADER_VERSION
          "uniform mat4 ProjMtx;\n"
          "in vec2 Position;\n"
          "in vec2 TexCoord;\n"
          "in vec4 Color;\n"
          "out vec2 Frag_UV;\n"
          "out vec4 Frag_Color;\n"
          "void main() {\n"
          "   Frag_UV = TexCoord;\n"
          "   Frag_Color = Color;\n"
          "   gl_Position = ProjMtx * vec4(Position.xy, 0, 1);\n"
          "}\n";
      static const GLchar *fragment_shader =
          NK_SHADER_VERSION
          "precision mediump float;\n"
          "uniform sampler2D Texture;\n"
          "in vec2 Frag_UV;\n"
          "in vec4 Frag_Color;\n"
          "out vec4 Out_Color;\n"
          "void main(){\n"
          "   Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
          "}\n";
  
      struct nk_glfw_device *dev = &glfw->ogl;
      nk_buffer_init_default(&dev->cmds);
      dev->prog = glCreateProgram();
      dev->vert_shdr = glCreateShader(GL_VERTEX_SHADER);
      dev->frag_shdr = glCreateShader(GL_FRAGMENT_SHADER);
      glShaderSource(dev->vert_shdr, 1, &vertex_shader, 0);
      glShaderSource(dev->frag_shdr, 1, &fragment_shader, 0);
      glCompileShader(dev->vert_shdr);
      glCompileShader(dev->frag_shdr);
      glGetShaderiv(dev->vert_shdr, GL_COMPILE_STATUS, &status);
      assert(status == GL_TRUE);
      glGetShaderiv(dev->frag_shdr, GL_COMPILE_STATUS, &status);
      assert(status == GL_TRUE);
      glAttachShader(dev->prog, dev->vert_shdr);
      glAttachShader(dev->prog, dev->frag_shdr);
      glLinkProgram(dev->prog);
      glGetProgramiv(dev->prog, GL_LINK_STATUS, &status);
      assert(status == GL_TRUE);
  
      dev->uniform_tex = glGetUniformLocation(dev->prog, "Texture");
      dev->uniform_proj = glGetUniformLocation(dev->prog, "ProjMtx");
      dev->attrib_pos = glGetAttribLocation(dev->prog, "Position");
      dev->attrib_uv = glGetAttribLocation(dev->prog, "TexCoord");
      dev->attrib_col = glGetAttribLocation(dev->prog, "Color");
  
      {
          /* buffer setup */
          GLsizei vs = sizeof(struct nk_glfw_vertex);
          size_t vp = offsetof(struct nk_glfw_vertex, position);
          size_t vt = offsetof(struct nk_glfw_vertex, uv);
          size_t vc = offsetof(struct nk_glfw_vertex, col);
  
          glGenBuffers(1, &dev->vbo);
          glGenBuffers(1, &dev->ebo);
          glGenVertexArrays(1, &dev->vao);
  
          glBindVertexArray(dev->vao);
          glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
          glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
  
          glEnableVertexAttribArray((GLuint)dev->attrib_pos);
          glEnableVertexAttribArray((GLuint)dev->attrib_uv);
          glEnableVertexAttribArray((GLuint)dev->attrib_col);
  
          glVertexAttribPointer((GLuint)dev->attrib_pos, 2, GL_FLOAT, GL_FALSE, vs, (void*)vp);
          glVertexAttribPointer((GLuint)dev->attrib_uv, 2, GL_FLOAT, GL_FALSE, vs, (void*)vt);
          glVertexAttribPointer((GLuint)dev->attrib_col, 4, GL_UNSIGNED_BYTE, GL_TRUE, vs, (void*)vc);
      }
  
      glBindTexture(GL_TEXTURE_2D, 0);
      glBindBuffer(GL_ARRAY_BUFFER, 0);
      glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
      glBindVertexArray(0);
  }
  
  NK_INTERN void
  nk_glfw3_device_upload_atlas(struct nk_glfw* glfw, const void *image, int width, int height)
  {
      struct nk_glfw_device *dev = &glfw->ogl;
      glGenTextures(1, &dev->font_tex);
      glBindTexture(GL_TEXTURE_2D, dev->font_tex);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
                  GL_RGBA, GL_UNSIGNED_BYTE, image);
  }
  
  NK_API void
  nk_glfw3_device_destroy(struct nk_glfw* glfw)
  {
      struct nk_glfw_device *dev = &glfw->ogl;
      glDetachShader(dev->prog, dev->vert_shdr);
      glDetachShader(dev->prog, dev->frag_shdr);
      glDeleteShader(dev->vert_shdr);
      glDeleteShader(dev->frag_shdr);
      glDeleteProgram(dev->prog);
      glDeleteTextures(1, &dev->font_tex);
      glDeleteBuffers(1, &dev->vbo);
      glDeleteBuffers(1, &dev->ebo);
      nk_buffer_free(&dev->cmds);
  }
  
  NK_API void
  nk_glfw3_render(struct nk_glfw* glfw, enum nk_anti_aliasing AA, int max_vertex_buffer, int max_element_buffer)
  {
      struct nk_glfw_device *dev = &glfw->ogl;
      struct nk_buffer vbuf, ebuf;
      GLfloat ortho[4][4] = {
          {2.0f, 0.0f, 0.0f, 0.0f},
          {0.0f,-2.0f, 0.0f, 0.0f},
          {0.0f, 0.0f,-1.0f, 0.0f},
          {-1.0f,1.0f, 0.0f, 1.0f},
      };
      ortho[0][0] /= (GLfloat)glfw->width;
      ortho[1][1] /= (GLfloat)glfw->height;
  
      /* setup global state */
      glEnable(GL_BLEND);
      glBlendEquation(GL_FUNC_ADD);
      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
      glDisable(GL_CULL_FACE);
      glDisable(GL_DEPTH_TEST);
      glEnable(GL_SCISSOR_TEST);
      glActiveTexture(GL_TEXTURE0);
  
      /* setup program */
      glUseProgram(dev->prog);
      glUniform1i(dev->uniform_tex, 0);
      glUniformMatrix4fv(dev->uniform_proj, 1, GL_FALSE, &ortho[0][0]);
      glViewport(0,0,(GLsizei)glfw->display_width,(GLsizei)glfw->display_height);
      {
          /* convert from command queue into draw list and draw to screen */
          const struct nk_draw_command *cmd;
          void *vertices, *elements;
          const nk_draw_index *offset = NULL;
  
          /* allocate vertex and element buffer */
          glBindVertexArray(dev->vao);
          glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
          glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
  
          glBufferData(GL_ARRAY_BUFFER, max_vertex_buffer, NULL, GL_STREAM_DRAW);
          glBufferData(GL_ELEMENT_ARRAY_BUFFER, max_element_buffer, NULL, GL_STREAM_DRAW);
  
          /* load draw vertices & elements directly into vertex + element buffer */
          vertices = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
          elements = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
          {
              /* fill convert configuration */
              struct nk_convert_config config;
              static const struct nk_draw_vertex_layout_element vertex_layout[] = {
                  {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, position)},
                  {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_glfw_vertex, uv)},
                  {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_glfw_vertex, col)},
                  {NK_VERTEX_LAYOUT_END}
              };
              memset(&config, 0, sizeof(config));
              config.vertex_layout = vertex_layout;
              config.vertex_size = sizeof(struct nk_glfw_vertex);
              config.vertex_alignment = NK_ALIGNOF(struct nk_glfw_vertex);
              config.null = dev->null;
              config.circle_segment_count = 22;
              config.curve_segment_count = 22;
              config.arc_segment_count = 22;
              config.global_alpha = 1.0f;
              config.shape_AA = AA;
              config.line_AA = AA;
  
              /* setup buffers to load vertices and elements */
              nk_buffer_init_fixed(&vbuf, vertices, (size_t)max_vertex_buffer);
              nk_buffer_init_fixed(&ebuf, elements, (size_t)max_element_buffer);
              nk_convert(&glfw->ctx, &dev->cmds, &vbuf, &ebuf, &config);
          }
          glUnmapBuffer(GL_ARRAY_BUFFER);
          glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
  
          /* iterate over and execute each draw command */
          nk_draw_foreach(cmd, &glfw->ctx, &dev->cmds)
          {
              if (!cmd->elem_count) continue;
              glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
              glScissor(
                  (GLint)(cmd->clip_rect.x * glfw->fb_scale.x),
                  (GLint)((glfw->height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h)) * glfw->fb_scale.y),
                  (GLint)(cmd->clip_rect.w * glfw->fb_scale.x),
                  (GLint)(cmd->clip_rect.h * glfw->fb_scale.y));
              glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
              offset += cmd->elem_count;
          }
          nk_clear(&glfw->ctx);
          nk_buffer_clear(&dev->cmds);
      }
  
      /* default OpenGL state */
      glUseProgram(0);
      glBindBuffer(GL_ARRAY_BUFFER, 0);
      glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
      glBindVertexArray(0);
      glDisable(GL_BLEND);
      glDisable(GL_SCISSOR_TEST);
  }
  
  NK_API void
  nk_glfw3_char_callback(GLFWwindow *win, unsigned int codepoint)
  {
      struct nk_glfw* glfw = glfwGetWindowUserPointer(win);
      if (glfw->text_len < NK_GLFW_TEXT_MAX)
          glfw->text[glfw->text_len++] = codepoint;
  }
  
  NK_API void
  nk_gflw3_scroll_callback(GLFWwindow *win, double xoff, double yoff)
  {
      struct nk_glfw* glfw = glfwGetWindowUserPointer(win);
      (void)xoff;
      glfw->scroll.x += (float)xoff;
      glfw->scroll.y += (float)yoff;
  }
  
  NK_API void
  nk_glfw3_mouse_button_callback(GLFWwindow* win, int button, int action, int mods)
  {
      double x, y;
      if (button != GLFW_MOUSE_BUTTON_LEFT) return;
      struct nk_glfw* glfw = glfwGetWindowUserPointer(win);
      glfwGetCursorPos(win, &x, &y);
      if (action == GLFW_PRESS)  {
          double dt = glfwGetTime() - glfw->last_button_click;
          if (dt > NK_GLFW_DOUBLE_CLICK_LO && dt < NK_GLFW_DOUBLE_CLICK_HI) {
              glfw->is_double_click_down = nk_true;
              glfw->double_click_pos = nk_vec2((float)x, (float)y);
          }
          glfw->last_button_click = glfwGetTime();
      } else glfw->is_double_click_down = nk_false;
  }
  
  NK_INTERN void
  nk_glfw3_clipboard_paste(nk_handle usr, struct nk_text_edit *edit)
  {
      struct nk_glfw* glfw = usr.ptr;
      const char *text = glfwGetClipboardString(glfw->win);
      if (text) nk_textedit_paste(edit, text, nk_strlen(text));
      (void)usr;
  }
  
  NK_INTERN void
  nk_glfw3_clipboard_copy(nk_handle usr, const char *text, int len)
  {
      char *str = 0;
      if (!len) return;
      str = (char*)malloc((size_t)len+1);
      if (!str) return;
      memcpy(str, text, (size_t)len);
      str[len] = '\0';
      struct nk_glfw* glfw = usr.ptr;
      glfwSetClipboardString(glfw->win, str);
      free(str);
  }
  
  NK_API struct nk_context*
  nk_glfw3_init(struct nk_glfw* glfw, GLFWwindow *win, enum nk_glfw_init_state init_state)
  {
      glfwSetWindowUserPointer(win, glfw);
      glfw->win = win;
      if (init_state == NK_GLFW3_INSTALL_CALLBACKS) {
          glfwSetScrollCallback(win, nk_gflw3_scroll_callback);
          glfwSetCharCallback(win, nk_glfw3_char_callback);
          glfwSetMouseButtonCallback(win, nk_glfw3_mouse_button_callback);
      }
      nk_init_default(&glfw->ctx, 0);
      glfw->ctx.clip.copy = nk_glfw3_clipboard_copy;
      glfw->ctx.clip.paste = nk_glfw3_clipboard_paste;
      glfw->ctx.clip.userdata = nk_handle_ptr(&glfw);
      glfw->last_button_click = 0;
      nk_glfw3_device_create(glfw);
  
      glfw->is_double_click_down = nk_false;
      glfw->double_click_pos = nk_vec2(0, 0);
  
      return &glfw->ctx;
  }
  
  NK_API void
  nk_glfw3_font_stash_begin(struct nk_glfw* glfw, struct nk_font_atlas **atlas)
  {
      nk_font_atlas_init_default(&glfw->atlas);
      nk_font_atlas_begin(&glfw->atlas);
      *atlas = &glfw->atlas;
  }
  
  NK_API void
  nk_glfw3_font_stash_end(struct nk_glfw* glfw)
  {
      const void *image; int w, h;
      image = nk_font_atlas_bake(&glfw->atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
      nk_glfw3_device_upload_atlas(glfw, image, w, h);
      nk_font_atlas_end(&glfw->atlas, nk_handle_id((int)glfw->ogl.font_tex), &glfw->ogl.null);
      if (glfw->atlas.default_font)
          nk_style_set_font(&glfw->ctx, &glfw->atlas.default_font->handle);
  }
  
  NK_API void
  nk_glfw3_new_frame(struct nk_glfw* glfw)
  {
      int i;
      double x, y;
      struct nk_context *ctx = &glfw->ctx;
      struct GLFWwindow *win = glfw->win;
  
      glfwGetWindowSize(win, &glfw->width, &glfw->height);
      glfwGetFramebufferSize(win, &glfw->display_width, &glfw->display_height);
      glfw->fb_scale.x = (float)glfw->display_width/(float)glfw->width;
      glfw->fb_scale.y = (float)glfw->display_height/(float)glfw->height;
  
      nk_input_begin(ctx);
      for (i = 0; i < glfw->text_len; ++i)
          nk_input_unicode(ctx, glfw->text[i]);
  
  #ifdef NK_GLFW_GL3_MOUSE_GRABBING
      /* optional grabbing behavior */
      if (ctx->input.mouse.grab)
          glfwSetInputMode(glfw.win, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
      else if (ctx->input.mouse.ungrab)
          glfwSetInputMode(glfw->win, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
  #endif
  
      nk_input_key(ctx, NK_KEY_DEL, glfwGetKey(win, GLFW_KEY_DELETE) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_ENTER, glfwGetKey(win, GLFW_KEY_ENTER) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_TAB, glfwGetKey(win, GLFW_KEY_TAB) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_BACKSPACE, glfwGetKey(win, GLFW_KEY_BACKSPACE) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_UP, glfwGetKey(win, GLFW_KEY_UP) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_DOWN, glfwGetKey(win, GLFW_KEY_DOWN) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_TEXT_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_TEXT_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_SCROLL_START, glfwGetKey(win, GLFW_KEY_HOME) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_SCROLL_END, glfwGetKey(win, GLFW_KEY_END) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_SCROLL_DOWN, glfwGetKey(win, GLFW_KEY_PAGE_DOWN) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_SCROLL_UP, glfwGetKey(win, GLFW_KEY_PAGE_UP) == GLFW_PRESS);
      nk_input_key(ctx, NK_KEY_SHIFT, glfwGetKey(win, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS||
                                      glfwGetKey(win, GLFW_KEY_RIGHT_SHIFT) == GLFW_PRESS);
  
      if (glfwGetKey(win, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS ||
          glfwGetKey(win, GLFW_KEY_RIGHT_CONTROL) == GLFW_PRESS) {
          nk_input_key(ctx, NK_KEY_COPY, glfwGetKey(win, GLFW_KEY_C) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_PASTE, glfwGetKey(win, GLFW_KEY_V) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_CUT, glfwGetKey(win, GLFW_KEY_X) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_TEXT_UNDO, glfwGetKey(win, GLFW_KEY_Z) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_TEXT_REDO, glfwGetKey(win, GLFW_KEY_R) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_TEXT_LINE_START, glfwGetKey(win, GLFW_KEY_B) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_TEXT_LINE_END, glfwGetKey(win, GLFW_KEY_E) == GLFW_PRESS);
      } else {
          nk_input_key(ctx, NK_KEY_LEFT, glfwGetKey(win, GLFW_KEY_LEFT) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_RIGHT, glfwGetKey(win, GLFW_KEY_RIGHT) == GLFW_PRESS);
          nk_input_key(ctx, NK_KEY_COPY, 0);
          nk_input_key(ctx, NK_KEY_PASTE, 0);
          nk_input_key(ctx, NK_KEY_CUT, 0);
          nk_input_key(ctx, NK_KEY_SHIFT, 0);
      }
  
      glfwGetCursorPos(win, &x, &y);
      nk_input_motion(ctx, (int)x, (int)y);
  #ifdef NK_GLFW_GL3_MOUSE_GRABBING
      if (ctx->input.mouse.grabbed) {
          glfwSetCursorPos(glfw->win, ctx->input.mouse.prev.x, ctx->input.mouse.prev.y);
          ctx->input.mouse.pos.x = ctx->input.mouse.prev.x;
          ctx->input.mouse.pos.y = ctx->input.mouse.prev.y;
      }
  #endif
      nk_input_button(ctx, NK_BUTTON_LEFT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_LEFT) == GLFW_PRESS);
      nk_input_button(ctx, NK_BUTTON_MIDDLE, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_MIDDLE) == GLFW_PRESS);
      nk_input_button(ctx, NK_BUTTON_RIGHT, (int)x, (int)y, glfwGetMouseButton(win, GLFW_MOUSE_BUTTON_RIGHT) == GLFW_PRESS);
      nk_input_button(ctx, NK_BUTTON_DOUBLE, (int)glfw->double_click_pos.x, (int)glfw->double_click_pos.y, glfw->is_double_click_down);
      nk_input_scroll(ctx, glfw->scroll);
      nk_input_end(&glfw->ctx);
      glfw->text_len = 0;
      glfw->scroll = nk_vec2(0,0);
  }
  
  NK_API
  void nk_glfw3_shutdown(struct nk_glfw* glfw)
  {
      nk_font_atlas_clear(&glfw->atlas);
      nk_free(&glfw->ctx);
      nk_glfw3_device_destroy(glfw);
      memset(glfw, 0, sizeof(*glfw));
  }
  
  #endif
  