glfw/tests/accuracy.c

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//========================================================================
// 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
//
//========================================================================
#define GLFW_INCLUDE_GLU
#include <GL/glfw3.h>
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#include <stdio.h>
#include <stdlib.h>
static int cursor_x = 0, cursor_y = 0;
static int window_width = 640, window_height = 480;
static int swap_interval = 1;
static void set_swap_interval(GLFWwindow window, int interval)
{
char title[256];
swap_interval = interval;
glfwSwapInterval(swap_interval);
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sprintf(title, "Cursor Inaccuracy Detector (interval %i)", swap_interval);
glfwSetWindowTitle(window, title);
}
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static void window_size_callback(GLFWwindow window, int width, int height)
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{
window_width = width;
window_height = height;
glViewport(0, 0, window_width, window_height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.f, window_width, 0.f, window_height);
}
static void cursor_position_callback(GLFWwindow window, int x, int y)
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{
cursor_x = x;
cursor_y = y;
}
static void key_callback(GLFWwindow window, int key, int action)
{
if (key == GLFW_KEY_SPACE && action == GLFW_PRESS)
set_swap_interval(window, 1 - swap_interval);
}
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int main(void)
{
GLFWwindow window;
int width, height;
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if (!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError()));
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exit(EXIT_FAILURE);
}
glfwSetCursorPosCallback(cursor_position_callback);
glfwSetWindowSizeCallback(window_size_callback);
glfwSetKeyCallback(key_callback);
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window = glfwCreateWindow(window_width, window_height, "", NULL, NULL);
if (!window)
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{
glfwTerminate();
fprintf(stderr, "Failed to open GLFW window: %s\n", glfwErrorString(glfwGetError()));
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exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
glfwGetWindowSize(window, &width, &height);
window_size_callback(window, width, height);
set_swap_interval(window, swap_interval);
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while (!glfwGetWindowParam(window, GLFW_CLOSE_REQUESTED))
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{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_LINES);
glVertex2f(0.f, (GLfloat) window_height - cursor_y);
glVertex2f((GLfloat) window_width, (GLfloat) window_height - cursor_y);
glVertex2f((GLfloat) cursor_x, 0.f);
glVertex2f((GLfloat) cursor_x, (GLfloat) window_height);
glEnd();
glfwSwapBuffers(window);
glfwPollEvents();
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}
glfwTerminate();
exit(EXIT_SUCCESS);
}