mirror of
https://github.com/glfw/glfw.git
synced 2024-11-22 13:04:35 +00:00
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
//========================================================================
|
|
// Mouse cursor accuracy test
|
|
// Copyright (c) Camilla Berglund <elmindreda@elmindreda.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 came about as the result of bug #1867804
|
|
//
|
|
// No sign of said bug has so far been detected
|
|
//
|
|
//========================================================================
|
|
|
|
#include <GLFW/glfw3.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
static double cursor_x = 0.0, cursor_y = 0.0;
|
|
static int swap_interval = 1;
|
|
|
|
static void set_swap_interval(GLFWwindow* window, int interval)
|
|
{
|
|
char title[256];
|
|
|
|
swap_interval = interval;
|
|
glfwSwapInterval(swap_interval);
|
|
|
|
sprintf(title, "Cursor Inaccuracy Detector (interval %i)", swap_interval);
|
|
|
|
glfwSetWindowTitle(window, title);
|
|
}
|
|
|
|
static void error_callback(int error, const char* description)
|
|
{
|
|
fprintf(stderr, "Error: %s\n", description);
|
|
}
|
|
|
|
static void cursor_position_callback(GLFWwindow* window, double x, double y)
|
|
{
|
|
cursor_x = x;
|
|
cursor_y = y;
|
|
}
|
|
|
|
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
|
|
{
|
|
if (key == GLFW_KEY_SPACE && action == GLFW_PRESS)
|
|
set_swap_interval(window, 1 - swap_interval);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
GLFWwindow* window;
|
|
|
|
glfwSetErrorCallback(error_callback);
|
|
|
|
if (!glfwInit())
|
|
exit(EXIT_FAILURE);
|
|
|
|
window = glfwCreateWindow(640, 480, "", NULL, NULL);
|
|
if (!window)
|
|
{
|
|
glfwTerminate();
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
glfwSetCursorPosCallback(window, cursor_position_callback);
|
|
glfwSetKeyCallback(window, key_callback);
|
|
|
|
glfwMakeContextCurrent(window);
|
|
|
|
set_swap_interval(window, swap_interval);
|
|
|
|
while (!glfwWindowShouldClose(window))
|
|
{
|
|
int wnd_width, wnd_height, fb_width, fb_height;
|
|
float scale;
|
|
|
|
glfwGetWindowSize(window, &wnd_width, &wnd_height);
|
|
glfwGetFramebufferSize(window, &fb_width, &fb_height);
|
|
|
|
scale = (float) fb_width / (float) wnd_width;
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
glViewport(0, 0, fb_width, fb_height);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glOrtho(0.f, fb_width, 0.f, fb_height, 0.f, 1.f);
|
|
|
|
glBegin(GL_LINES);
|
|
glVertex2f(0.f, (GLfloat) (fb_height - cursor_y * scale));
|
|
glVertex2f((GLfloat) fb_width, (GLfloat) (fb_height - cursor_y * scale));
|
|
glVertex2f((GLfloat) cursor_x * scale, 0.f);
|
|
glVertex2f((GLfloat) cursor_x * scale, (GLfloat) fb_height);
|
|
glEnd();
|
|
|
|
glfwSwapBuffers(window);
|
|
glfwPollEvents();
|
|
}
|
|
|
|
glfwTerminate();
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|