bae255ee1a
wlroots headers can mostly be included with extern "C" blocks. Two exceptions are the use of `static` for array args and `class` as a struct field. These can be #define'ed to avoid C++ build errors. This allows the whole project to be built as a single C++ codebase, without having to maintain hybrid header files.
82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
// Try to figure out when vblank is and notify steamcompmgr to render some time before it
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#include <thread>
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#include <vector>
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#include <chrono>
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#include <atomic>
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#include "X11/Xlib.h"
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#include "assert.h"
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#include "gpuvis_trace_utils.h"
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#include "vblankmanager.hpp"
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#include "steamcompmgr.hpp"
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#include "wlserver.hpp"
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#include "main.hpp"
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static Display *g_nestedDpy;
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static XEvent repaintMsg;
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std::mutex g_vblankLock;
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std::chrono::time_point< std::chrono::system_clock > g_lastVblank;
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float g_flVblankDrawBufferMS = 5.0;
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void vblankThreadRun( void )
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{
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while ( true )
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{
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std::chrono::time_point< std::chrono::system_clock > lastVblank;
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int usecInterval = 1.0 / g_nOutputRefresh * 1000.0 * 1000.0;
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{
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std::unique_lock<std::mutex> lock( g_vblankLock );
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lastVblank = g_lastVblank;
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}
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lastVblank -= std::chrono::microseconds( (int)(g_flVblankDrawBufferMS * 1000) );
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std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
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std::chrono::system_clock::time_point targetPoint = lastVblank + std::chrono::microseconds( usecInterval );
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while ( targetPoint < now )
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{
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targetPoint += std::chrono::microseconds( usecInterval );
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}
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std::this_thread::sleep_until( targetPoint );
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XSendEvent( g_nestedDpy , DefaultRootWindow( g_nestedDpy ), True, SubstructureRedirectMask, &repaintMsg);
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XFlush( g_nestedDpy );
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gpuvis_trace_printf( "sent vblank\n" );
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// Get on the other side of it now
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std::this_thread::sleep_for( std::chrono::microseconds( (int)((g_flVblankDrawBufferMS + 1.0) * 1000) ) );
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}
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}
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void vblank_init( void )
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{
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g_nestedDpy = XOpenDisplay( wlserver_get_nested_display() );
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assert( g_nestedDpy != nullptr );
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repaintMsg.xclient.type = ClientMessage;
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repaintMsg.xclient.window = DefaultRootWindow( g_nestedDpy );
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repaintMsg.xclient.format = 32;
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repaintMsg.xclient.data.l[0] = 24;
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repaintMsg.xclient.data.l[1] = 8;
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g_lastVblank = std::chrono::system_clock::now();
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std::thread vblankThread( vblankThreadRun );
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vblankThread.detach();
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}
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void vblank_mark_possible_vblank( void )
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{
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std::unique_lock<std::mutex> lock( g_vblankLock );
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g_lastVblank = std::chrono::system_clock::now();
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}
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