OpenGL Insights

406 V Transfers

main

–

hrc =

wglCreateContextAttribsARB(

hdc, NULL, attribs

);

worker1

–

hrc =

wglCreateContextAttribsARB(

hdc, main

–

hrc, NULL

);

worker2

–

hrc =

wglCreateContextAttribsARB(

hdc, main

–

hrc, NULL

);

OpenGL calls OpenGL calls OpenGL calls

Thread lane OpenGL call

CPU synchronization

wglMakeCurrent(

hdc, main

–

hrc

);

wglMakeCurrent(

hdc, worker1

–

hrc

);

wglMakeCurrent(

hdc, worker2

–

hrc

);

Main rendering thread

Worker thread 1 Worker thread 2

Figure 28.8. Shared-context creation on Windo w s.

28.6.2 Synchronization Issues

In a single-threaded scenario, it is perfectly valid to respecify a buffer while it is

currently in use: the driver will put glBufferData in