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- From 9e3b9f4dfa273c5d0536c748153f65c0899bf3b8 Mon Sep 17 00:00:00 2001
- From: Frank Binns <frank.binns@imgtec.com>
- Date: Tue, 15 Sep 2015 14:15:31 +0100
- Subject: [PATCH] egl: optimise eglMakeCurrent for the case where nothing has
- changed
- When an application calls eglMakeCurrent with a context, draw surface and
- read surface that match those that are currently bound to the calling
- thread don't perform a flush as this is an expensive operation.
- ---
- src/egl/main/eglapi.c | 12 +++++++++++-
- 1 file changed, 11 insertions(+), 1 deletion(-)
- diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
- index 3cd69b9..234449a 100644
- --- a/src/egl/main/eglapi.c
- +++ b/src/egl/main/eglapi.c
- @@ -853,6 +853,7 @@ eglMakeCurrent(EGLDisplay dpy, EGLSurface draw, EGLSurface read,
- EGLContext ctx)
- {
- _EGLDisplay *disp = _eglLockDisplay(dpy);
- + _EGLContext *current_context = _eglGetCurrentContext();
- _EGLContext *context = _eglLookupContext(ctx, disp);
- _EGLSurface *draw_surf = _eglLookupSurface(draw, disp);
- _EGLSurface *read_surf = _eglLookupSurface(read, disp);
- @@ -909,7 +910,16 @@ eglMakeCurrent(EGLDisplay dpy, EGLSurface draw, EGLSurface read,
- draw_surf && !draw_surf->ProtectedContent)
- RETURN_EGL_ERROR(disp, EGL_BAD_ACCESS, EGL_FALSE);
-
- - ret = disp->Driver->MakeCurrent(disp, draw_surf, read_surf, context);
- + /* As an optimisation don't do anything unless something has changed */
- + if (context != current_context ||
- + (current_context &&
- + (draw_surf != current_context->DrawSurface ||
- + read_surf != current_context->ReadSurface)) ||
- + (!current_context && (draw_surf || read_surf))) {
- + ret = disp->Driver->MakeCurrent(disp, draw_surf, read_surf, context);
- + } else {
- + ret = EGL_TRUE;
- + }
-
- RETURN_EGL_EVAL(disp, ret);
- }
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