mirrors/looking-glass
2
0
Fork 0
mirror of https://github.com/gnif/LookingGlass.git synced 2024-12-23 06:11:46 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

[client] opengl: added back double buffering and vsync support

Browse source 
This adds back in double buffering and vsync support. This has been
carefully implemented so that the render function blocks until the video
card reports that it has advanced a frame, this ensures that the OpenGL
pipeline never buffers frames.
This commit is contained in:
Geoffrey McRae 2017-12-15 16:21:38 +11:00
parent 0d8b2449cf
commit 9c03327701
1 changed files with 13 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
client/renderers/opengl.c
View file

@ -47,6 +47,7 @@ struct LGR_OpenGL
{
LG_RendererParams params;
bool configured;
SDL_Window * sdlWindow;
SDL_GLContext glContext;
bool doneInfo;
@ -131,7 +132,7 @@ bool lgr_opengl_initialize(void ** opaque, const LG_RendererParams params, Uint3
}
*sdlFlags = SDL_WINDOW_OPENGL;
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 0);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
return true;
}
@ -147,6 +148,7 @@ bool lgr_opengl_configure(void * opaque, SDL_Window *window, const LG_RendererFo
return false;
}
this->sdlWindow = window;
this->glContext = SDL_GL_CreateContext(window);
if (!this->glContext)
{
@ -168,7 +170,7 @@ bool lgr_opengl_configure(void * opaque, SDL_Window *window, const LG_RendererFo
return false;
}
SDL_GL_SetSwapInterval(0);
SDL_GL_SetSwapInterval(this->params.vsync ? 1 : 0);
// check if the GPU supports GL_ARB_buffer_storage first
// there is no advantage to this renderer if it is not present.
@ -706,10 +708,6 @@ bool lgr_opengl_render(void * opaque)
return true;
}
// wait for vsync
unsigned int count;
glXWaitVideoSyncSGI(1, 0, &count);
glDisable(GL_SCISSOR_TEST);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_SCISSOR_TEST);
@ -718,7 +716,15 @@ bool lgr_opengl_render(void * opaque)
lgr_opengl_draw_mouse(this);
if (this->fpsTexture)
glCallList(this->fpsList);
glFlush();
unsigned int before, after;
glXGetVideoSyncSGI(&before);
SDL_GL_SwapWindow(this->sdlWindow);
// wait for the swap to happen to ensure we dont buffer frames
glXGetVideoSyncSGI(&after);
if (before == after)
glXWaitVideoSyncSGI(1, 0, &before);
++this->frameCount;
const uint64_t t = nanotime();