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

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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
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20
client/renderers/opengl.c
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@ -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();