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diff --git a/libs/glfw-3.3.8/tests/inputlag.c b/libs/glfw-3.3.8/tests/inputlag.c
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+++ b/libs/glfw-3.3.8/tests/inputlag.c
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+//========================================================================
+// Input lag test
+// Copyright (c) Camilla Löwy <elmindreda@glfw.org>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would
+// be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+// be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+// distribution.
+//
+//========================================================================
+//
+// This test renders a marker at the cursor position reported by GLFW to
+// check how much it lags behind the hardware mouse cursor
+//
+//========================================================================
+
+#include <glad/gl.h>
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+
+#define NK_IMPLEMENTATION
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_STANDARD_VARARGS
+#include <nuklear.h>
+
+#define NK_GLFW_GL2_IMPLEMENTATION
+#include <nuklear_glfw_gl2.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "getopt.h"
+
+void usage(void)
+{
+ printf("Usage: inputlag [-h] [-f]\n");
+ printf("Options:\n");
+ printf(" -f create full screen window\n");
+ printf(" -h show this help\n");
+}
+
+struct nk_vec2 cursor_new, cursor_pos, cursor_vel;
+enum { cursor_sync_query, cursor_input_message } cursor_method = cursor_sync_query;
+
+void sample_input(GLFWwindow* window)
+{
+ float a = .25; // exponential smoothing factor
+
+ if (cursor_method == cursor_sync_query) {
+ double x, y;
+ glfwGetCursorPos(window, &x, &y);
+ cursor_new.x = (float) x;
+ cursor_new.y = (float) y;
+ }
+
+ cursor_vel.x = (cursor_new.x - cursor_pos.x) * a + cursor_vel.x * (1 - a);
+ cursor_vel.y = (cursor_new.y - cursor_pos.y) * a + cursor_vel.y * (1 - a);
+ cursor_pos = cursor_new;
+}
+
+void cursor_pos_callback(GLFWwindow* window, double xpos, double ypos)
+{
+ cursor_new.x = (float) xpos;
+ cursor_new.y = (float) ypos;
+}
+
+int enable_vsync = nk_true;
+
+void update_vsync()
+{
+ glfwSwapInterval(enable_vsync == nk_true ? 1 : 0);
+}
+
+int swap_clear = nk_false;
+int swap_finish = nk_true;
+int swap_occlusion_query = nk_false;
+int swap_read_pixels = nk_false;
+GLuint occlusion_query;
+
+void swap_buffers(GLFWwindow* window)
+{
+ glfwSwapBuffers(window);
+
+ if (swap_clear)
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ if (swap_finish)
+ glFinish();
+
+ if (swap_occlusion_query) {
+ GLint occlusion_result;
+ if (!occlusion_query)
+ glGenQueries(1, &occlusion_query);
+ glBeginQuery(GL_SAMPLES_PASSED, occlusion_query);
+ glBegin(GL_POINTS);
+ glVertex2f(0, 0);
+ glEnd();
+ glEndQuery(GL_SAMPLES_PASSED);
+ glGetQueryObjectiv(occlusion_query, GL_QUERY_RESULT, &occlusion_result);
+ }
+
+ if (swap_read_pixels) {
+ unsigned char rgba[4];
+ glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, rgba);
+ }
+}
+
+void error_callback(int error, const char* description)
+{
+ fprintf(stderr, "Error: %s\n", description);
+}
+
+void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+ if (action != GLFW_PRESS)
+ return;
+
+ switch (key)
+ {
+ case GLFW_KEY_ESCAPE:
+ glfwSetWindowShouldClose(window, 1);
+ break;
+ }
+}
+
+void draw_marker(struct nk_command_buffer* canvas, int lead, struct nk_vec2 pos)
+{
+ struct nk_color colors[4] = { nk_rgb(255,0,0), nk_rgb(255,255,0), nk_rgb(0,255,0), nk_rgb(0,96,255) };
+ struct nk_rect rect = { -5 + pos.x, -5 + pos.y, 10, 10 };
+ nk_fill_circle(canvas, rect, colors[lead]);
+}
+
+int main(int argc, char** argv)
+{
+ int ch, width, height;
+ unsigned long frame_count = 0;
+ double last_time, current_time;
+ double frame_rate = 0;
+ int fullscreen = GLFW_FALSE;
+ GLFWmonitor* monitor = NULL;
+ GLFWwindow* window;
+ struct nk_context* nk;
+ struct nk_font_atlas* atlas;
+
+ int show_forecasts = nk_true;
+
+ while ((ch = getopt(argc, argv, "fh")) != -1)
+ {
+ switch (ch)
+ {
+ case 'h':
+ usage();
+ exit(EXIT_SUCCESS);
+
+ case 'f':
+ fullscreen = GLFW_TRUE;
+ break;
+ }
+ }
+
+ glfwSetErrorCallback(error_callback);
+
+ if (!glfwInit())
+ exit(EXIT_FAILURE);
+
+ if (fullscreen)
+ {
+ const GLFWvidmode* mode;
+
+ monitor = glfwGetPrimaryMonitor();
+ mode = glfwGetVideoMode(monitor);
+
+ width = mode->width;
+ height = mode->height;
+ }
+ else
+ {
+ width = 640;
+ height = 480;
+ }
+
+ glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
+ glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+
+ glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
+
+ window = glfwCreateWindow(width, height, "Input lag test", monitor, NULL);
+ if (!window)
+ {
+ glfwTerminate();
+ exit(EXIT_FAILURE);
+ }
+
+ glfwMakeContextCurrent(window);
+ gladLoadGL(glfwGetProcAddress);
+ update_vsync();
+
+ last_time = glfwGetTime();
+
+ nk = nk_glfw3_init(window, NK_GLFW3_INSTALL_CALLBACKS);
+ nk_glfw3_font_stash_begin(&atlas);
+ nk_glfw3_font_stash_end();
+
+ glfwSetKeyCallback(window, key_callback);
+ glfwSetCursorPosCallback(window, cursor_pos_callback);
+
+ while (!glfwWindowShouldClose(window))
+ {
+ int width, height;
+ struct nk_rect area;
+
+ glfwPollEvents();
+ sample_input(window);
+
+ glfwGetWindowSize(window, &width, &height);
+ area = nk_rect(0.f, 0.f, (float) width, (float) height);
+
+ glClear(GL_COLOR_BUFFER_BIT);
+ nk_glfw3_new_frame();
+ if (nk_begin(nk, "", area, 0))
+ {
+ nk_flags align_left = NK_TEXT_ALIGN_LEFT | NK_TEXT_ALIGN_MIDDLE;
+ struct nk_command_buffer *canvas = nk_window_get_canvas(nk);
+ int lead;
+
+ for (lead = show_forecasts ? 3 : 0; lead >= 0; lead--)
+ draw_marker(canvas, lead, nk_vec2(cursor_pos.x + cursor_vel.x * lead,
+ cursor_pos.y + cursor_vel.y * lead));
+
+ // print instructions
+ nk_layout_row_dynamic(nk, 20, 1);
+ nk_label(nk, "Move mouse uniformly and check marker under cursor:", align_left);
+ for (lead = 0; lead <= 3; lead++) {
+ nk_layout_row_begin(nk, NK_STATIC, 12, 2);
+ nk_layout_row_push(nk, 25);
+ draw_marker(canvas, lead, nk_layout_space_to_screen(nk, nk_vec2(20, 5)));
+ nk_label(nk, "", 0);
+ nk_layout_row_push(nk, 500);
+ if (lead == 0)
+ nk_label(nk, "- current cursor position (no input lag)", align_left);
+ else
+ nk_labelf(nk, align_left, "- %d-frame forecast (input lag is %d frame)", lead, lead);
+ nk_layout_row_end(nk);
+ }
+
+ nk_layout_row_dynamic(nk, 20, 1);
+
+ nk_checkbox_label(nk, "Show forecasts", &show_forecasts);
+ nk_label(nk, "Input method:", align_left);
+ if (nk_option_label(nk, "glfwGetCursorPos (sync query)", cursor_method == cursor_sync_query))
+ cursor_method = cursor_sync_query;
+ if (nk_option_label(nk, "glfwSetCursorPosCallback (latest input message)", cursor_method == cursor_input_message))
+ cursor_method = cursor_input_message;
+
+ nk_label(nk, "", 0); // separator
+
+ nk_value_float(nk, "FPS", (float) frame_rate);
+ if (nk_checkbox_label(nk, "Enable vsync", &enable_vsync))
+ update_vsync();
+
+ nk_label(nk, "", 0); // separator
+
+ nk_label(nk, "After swap:", align_left);
+ nk_checkbox_label(nk, "glClear", &swap_clear);
+ nk_checkbox_label(nk, "glFinish", &swap_finish);
+ nk_checkbox_label(nk, "draw with occlusion query", &swap_occlusion_query);
+ nk_checkbox_label(nk, "glReadPixels", &swap_read_pixels);
+ }
+
+ nk_end(nk);
+ nk_glfw3_render(NK_ANTI_ALIASING_ON);
+
+ swap_buffers(window);
+
+ frame_count++;
+
+ current_time = glfwGetTime();
+ if (current_time - last_time > 1.0)
+ {
+ frame_rate = frame_count / (current_time - last_time);
+ frame_count = 0;
+ last_time = current_time;
+ }
+ }
+
+ glfwTerminate();
+ exit(EXIT_SUCCESS);
+}
+
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