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Add update flag to timeout test

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Redrawing the window contents for every possible event is not
a reasonable thing for an application to do.  The test should be whether
redrawing on demand plus periodic updates works with near-idle CPU use
and no extra input latency.

This change incidentally makes the test well-behaved on Wayland, where
it was previously broken due to every EGL buffer swap causing an event
to be received.
This commit is contained in:
Camilla Löwy 2026-01-22 16:28:24 +01:00
parent bafb134769
commit f871f14d5e
1 changed files with 30 additions and 1 deletions
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31
tests/timeout.c
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@ -36,6 +36,14 @@
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
static bool needs_update;
static void window_close_callback(GLFWwindow* window)
{
needs_update = true;
}
static void error_callback(int error, const char* description)
{
@ -45,7 +53,15 @@ static void error_callback(int error, const char* description)
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
{
glfwSetWindowShouldClose(window, GLFW_TRUE);
needs_update = true;
}
}
static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
needs_update = true;
}
static float nrand(void)
@ -72,8 +88,11 @@ int main(void)
}
glfwMakeContextCurrent(window);
glfwSwapInterval(0);
gladLoadGL(glfwGetProcAddress);
glfwSetWindowCloseCallback(window, window_close_callback);
glfwSetKeyCallback(window, key_callback);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
while (!glfwWindowShouldClose(window))
{
@ -87,8 +106,18 @@ int main(void)
glClearColor(r / l, g / l, b / l, 1.f);
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(window);
needs_update = false;
glfwWaitEventsTimeout(1.0);
const double start = glfwGetTime();
while (!needs_update)
{
const double elapsed = glfwGetTime() - start;
if (elapsed >= 1.0)
needs_update = true;
else
glfwWaitEventsTimeout(1.0 - elapsed);
}
}
glfwDestroyWindow(window);