Windsome Zeng
47 lines
1.8 KiB
Diff
47 lines
1.8 KiB
Diff
From f556292d5811750d119acea6c7dc0c5ebd3e1af6 Mon Sep 17 00:00:00 2001
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From: Frank Binns <frank.binns@imgtec.com>
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Date: Tue, 15 Sep 2015 14:15:31 +0100
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Subject: [PATCH 08/67] egl: optimise eglMakeCurrent for the case where nothing
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has changed
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When an application calls eglMakeCurrent with a context, draw surface and
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read surface that match those that are currently bound to the calling
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thread don't perform a flush as this is an expensive operation.
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---
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src/egl/main/eglapi.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
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index 3cd69b96a0f..234449adf64 100644
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--- a/src/egl/main/eglapi.c
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+++ b/src/egl/main/eglapi.c
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@@ -853,6 +853,7 @@ eglMakeCurrent(EGLDisplay dpy, EGLSurface draw, EGLSurface read,
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EGLContext ctx)
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{
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_EGLDisplay *disp = _eglLockDisplay(dpy);
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+ _EGLContext *current_context = _eglGetCurrentContext();
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_EGLContext *context = _eglLookupContext(ctx, disp);
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_EGLSurface *draw_surf = _eglLookupSurface(draw, disp);
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_EGLSurface *read_surf = _eglLookupSurface(read, disp);
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@@ -909,7 +910,16 @@ eglMakeCurrent(EGLDisplay dpy, EGLSurface draw, EGLSurface read,
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draw_surf && !draw_surf->ProtectedContent)
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RETURN_EGL_ERROR(disp, EGL_BAD_ACCESS, EGL_FALSE);
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- ret = disp->Driver->MakeCurrent(disp, draw_surf, read_surf, context);
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+ /* As an optimisation don't do anything unless something has changed */
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+ if (context != current_context ||
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+ (current_context &&
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+ (draw_surf != current_context->DrawSurface ||
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+ read_surf != current_context->ReadSurface)) ||
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+ (!current_context && (draw_surf || read_surf))) {
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+ ret = disp->Driver->MakeCurrent(disp, draw_surf, read_surf, context);
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+ } else {
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+ ret = EGL_TRUE;
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+ }
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RETURN_EGL_EVAL(disp, ret);
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}
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--
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2.25.1
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