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