mirror of
https://github.com/gwm17/glfw.git
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125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
//========================================================================
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// Mouse cursor accuracy test
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// Copyright (c) Camilla Berglund <elmindreda@elmindreda.org>
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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 came about as the result of bug #1867804
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//
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// No sign of said bug has so far been detected
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//
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//========================================================================
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#include <GLFW/glfw3.h>
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#include <stdio.h>
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#include <stdlib.h>
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static double cursor_x = 0.0, cursor_y = 0.0;
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static int swap_interval = 1;
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static void set_swap_interval(GLFWwindow* window, int interval)
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{
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char title[256];
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swap_interval = interval;
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glfwSwapInterval(swap_interval);
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sprintf(title, "Cursor Inaccuracy Detector (interval %i)", swap_interval);
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glfwSetWindowTitle(window, title);
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}
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static 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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static void cursor_position_callback(GLFWwindow* window, double x, double y)
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{
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cursor_x = x;
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cursor_y = y;
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}
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static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
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{
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if (key == GLFW_KEY_SPACE && action == GLFW_PRESS)
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set_swap_interval(window, 1 - swap_interval);
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}
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int main(void)
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{
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GLFWwindow* window;
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glfwSetErrorCallback(error_callback);
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if (!glfwInit())
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exit(EXIT_FAILURE);
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window = glfwCreateWindow(640, 480, "", NULL, 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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glfwSetCursorPosCallback(window, cursor_position_callback);
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glfwSetKeyCallback(window, key_callback);
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glfwMakeContextCurrent(window);
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set_swap_interval(window, swap_interval);
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while (!glfwWindowShouldClose(window))
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{
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int wnd_width, wnd_height, fb_width, fb_height;
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float scale;
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glfwGetWindowSize(window, &wnd_width, &wnd_height);
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glfwGetFramebufferSize(window, &fb_width, &fb_height);
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scale = (float) fb_width / (float) wnd_width;
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glClear(GL_COLOR_BUFFER_BIT);
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glViewport(0, 0, fb_width, fb_height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(0.f, fb_width, 0.f, fb_height, 0.f, 1.f);
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glBegin(GL_LINES);
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glVertex2f(0.f, (GLfloat) (fb_height - cursor_y * scale));
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glVertex2f((GLfloat) fb_width, (GLfloat) (fb_height - cursor_y * scale));
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glVertex2f((GLfloat) cursor_x * scale, 0.f);
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glVertex2f((GLfloat) cursor_x * scale, (GLfloat) fb_height);
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glEnd();
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwTerminate();
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exit(EXIT_SUCCESS);
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}
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