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Implement adaptive vsync.

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Adaptive vsync is a often requested feauture and easy to implement. Set
`r_vsync` to `2` to enable. This is untested because my system doesn't
support it.
This commit is contained in:
Yamagi 2020-04-20 12:31:25 +02:00
parent fc99e5456f
commit 19214d6049
3 changed files with 49 additions and 2 deletions
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1
doc/040_cvarlist.md
View file

@ -193,6 +193,7 @@ it's `+set busywait 0` (setting the `busywait` cvar) and `-portable`
* **r_vsync**: Enables the vsync: frames are synchronized with
display refresh rate, should (but doesn't always) prevent tearing.
Set to `1` for normal vsync and `2` for adaptive vsync.
## Graphics (GL renderers only)

25
src/client/refresh/gl1/gl1_sdl.c
View file

@ -130,7 +130,30 @@ int RI_PrepareForWindow(void)
*/
void RI_SetVsync(void)
{
SDL_GL_SetSwapInterval(r_vsync->value ? 1 : 0);
// Make sure that the user given
// value is SDL compatible...
int vsync = 0;
if (r_vsync->value == 1)
{
vsync = 1;
}
else if (r_vsync->value == 2)
{
vsync = -1;
}
if (SDL_GL_SetSwapInterval(vsync) == -1)
{
if (vsync == -1)
{
// Not every system supports adaptive
// vsync, fallback to normal vsync.
R_Printf(PRINT_ALL, "Failed to set adaptive vsync, reverting to normal vsync.\n");
SDL_GL_SetSwapInterval(1);
}
}
vsyncActive = SDL_GL_GetSwapInterval() != 0;
}

25
src/client/refresh/gl3/gl3_sdl.c
View file

@ -123,7 +123,30 @@ qboolean GL3_IsVsyncActive(void)
*/
void GL3_SetVsync(void)
{
SDL_GL_SetSwapInterval(r_vsync->value ? 1 : 0);
// Make sure that the user given
// value is SDL compatible...
int vsync = 0;
if (r_vsync->value == 1)
{
vsync = 1;
}
else if (r_vsync->value == 2)
{
vsync = -1;
}
if (SDL_GL_SetSwapInterval(vsync) == -1)
{
if (vsync == -1)
{
// Not every system supports adaptive
// vsync, fallback to normal vsync.
R_Printf(PRINT_ALL, "Failed to set adaptive vsync, reverting to normal vsync.\n");
SDL_GL_SetSwapInterval(1);
}
}
vsyncActive = SDL_GL_GetSwapInterval() != 0;
}