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NSGL: Simulate vsync for occluded windows

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This only supports a swap interval of zero or one, as that is all NSGL
supports.

(cherry picked from commit c3ca88055f)
This commit is contained in:
Camilla Löwy 2019-11-10 19:09:23 +01:00 committed by Camilla Löwy
parent ccb54c3e05
commit bb8ed627bf
1 changed files with 31 additions and 4 deletions
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33
src/nsgl_context.m
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@ -28,6 +28,9 @@
#include "internal.h"
#include <unistd.h>
#include <math.h>
static void makeContextCurrentNSGL(_GLFWwindow* window)
{
@autoreleasepool {
@ -45,7 +48,31 @@ static void makeContextCurrentNSGL(_GLFWwindow* window)
static void swapBuffersNSGL(_GLFWwindow* window)
{
@autoreleasepool {
// HACK: Simulate vsync with usleep as NSGL swap interval does not apply to
// windows with a non-visible occlusion state
if (!([window->ns.object occlusionState] & NSWindowOcclusionStateVisible))
{
int interval = 0;
[window->context.nsgl.object getValues:&interval
forParameter:NSOpenGLContextParameterSwapInterval];
if (interval > 0)
{
const double framerate = 60.0;
const uint64_t frequency = _glfwPlatformGetTimerFrequency();
const uint64_t value = _glfwPlatformGetTimerValue();
const double elapsed = value / (double) frequency;
const double period = 1.0 / framerate;
const double delay = period - fmod(elapsed, period);
usleep(floorl(delay * 1e6));
}
}
[window->context.nsgl.object flushBuffer];
} // autoreleasepool
}
@ -53,10 +80,10 @@ static void swapIntervalNSGL(int interval)
{
@autoreleasepool {
NSOpenGLContext* context = [NSOpenGLContext currentContext];
if (context)
_GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
if (window)
{
[context setValues:&interval
[window->context.nsgl.object setValues:&interval
forParameter:NSOpenGLContextParameterSwapInterval];
}