mirror of
https://github.com/glfw/glfw.git
synced 2024-11-13 05:53:50 +00:00
9cc8fc0d0a
The cached error code cannot be made per-thread unless it required glfwInit (due to lack of __thread on OS X), which would be confusing and partially defeats the purpose of it. Beginners would use the generic error string facility instead of the error callback and then be confused by its nondescript messages. Storing the provided error code from within the error callback, whether globally or per-thread, requires just a few lines of code and hands control to the user without compromising thread safety.
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
//========================================================================
|
|
// Vsync enabling 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 renders a high contrast, horizontally moving bar, allowing for
|
|
// visual verification of whether the set swap interval is indeed obeyed
|
|
//
|
|
//========================================================================
|
|
|
|
#include <GL/glfw3.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
static int swap_interval;
|
|
|
|
static void set_swap_interval(GLFWwindow window, int interval)
|
|
{
|
|
char title[256];
|
|
|
|
swap_interval = interval;
|
|
glfwSwapInterval(swap_interval);
|
|
|
|
sprintf(title, "Tearing 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 window_size_callback(GLFWwindow window, int width, int height)
|
|
{
|
|
glViewport(0, 0, width, height);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
float position;
|
|
GLFWwindow window;
|
|
|
|
glfwSetErrorCallback(error_callback);
|
|
|
|
if (!glfwInit())
|
|
exit(EXIT_FAILURE);
|
|
|
|
window = glfwCreateWindow(640, 480, GLFW_WINDOWED, "", NULL);
|
|
if (!window)
|
|
{
|
|
glfwTerminate();
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
glfwMakeContextCurrent(window);
|
|
set_swap_interval(window, swap_interval);
|
|
|
|
glfwSetWindowSizeCallback(window, window_size_callback);
|
|
glfwSetKeyCallback(window, key_callback);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glOrtho(-1.f, 1.f, -1.f, 1.f, 1.f, -1.f);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
|
|
while (!glfwGetWindowParam(window, GLFW_CLOSE_REQUESTED))
|
|
{
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
position = cosf(glfwGetTime() * 4.f) * 0.75f;
|
|
glRectf(position - 0.25f, -1.f, position + 0.25f, 1.f);
|
|
|
|
glfwSwapBuffers(window);
|
|
glfwPollEvents();
|
|
}
|
|
|
|
glfwTerminate();
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|