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https://github.com/glfw/glfw.git
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108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
//========================================================================
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// Vsync enabling 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 renders a high contrast, horizontally moving bar, allowing for
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// visual verification of whether the set swap interval is indeed obeyed
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//
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//========================================================================
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#include <GL/glfw3.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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static int swap_interval;
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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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snprintf(title, sizeof(title),
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"Tearing detector (interval %i)",
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swap_interval);
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glfwSetWindowTitle(window, title);
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}
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static void window_size_callback(GLFWwindow window, int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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static void key_callback(GLFWwindow window, int key, int action)
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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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float position;
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GLFWwindow window;
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if (!glfwInit())
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{
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fprintf(stderr, "Failed to initialize GLFW: %s\n", glfwErrorString(glfwGetError()));
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exit(EXIT_FAILURE);
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}
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window = glfwCreateWindow(0, 0, GLFW_WINDOWED, "", NULL);
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if (!window)
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{
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glfwTerminate();
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fprintf(stderr, "Failed to open GLFW window: %s\n", glfwErrorString(glfwGetError()));
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exit(EXIT_FAILURE);
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}
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set_swap_interval(window, swap_interval);
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glfwSetWindowSizeCallback(window_size_callback);
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glfwSetKeyCallback(key_callback);
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glMatrixMode(GL_PROJECTION);
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glOrtho(-1.f, 1.f, -1.f, 1.f, 1.f, -1.f);
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glMatrixMode(GL_MODELVIEW);
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while (glfwGetCurrentContext())
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{
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glClear(GL_COLOR_BUFFER_BIT);
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position = cosf(glfwGetTime() * 4.f) * 0.75f;
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glRectf(position - 0.25f, -1.f, position + 0.25f, 1.f);
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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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