From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 9 Nov 2021 23:52:27 +0000 (+0200)
Subject: Ensure that creating the system framebuffer doesn't change the binding
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=97afbb208a619d12d774ba7f21f7d08683ac8093

Ensure that creating the system framebuffer doesn't change the binding

Just in case it's for some reason created at an odd time.
---

diff --git a/source/backends/opengl/systemframebuffer.cpp b/source/backends/opengl/systemframebuffer.cpp
index dbfe0b82..2d066452 100644
--- a/source/backends/opengl/systemframebuffer.cpp
+++ b/source/backends/opengl/systemframebuffer.cpp
@@ -12,6 +12,11 @@ OpenGLSystemFramebuffer::OpenGLSystemFramebuffer():
 
 	if(EXT_framebuffer_object)
 	{
+		int old_id;
+		glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &old_id);
+		if(old_id)
+			glBindFramebuffer(GL_DRAW_FRAMEBUFFER_BINDING, 0);
+
 		int value;
 		glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_BACK, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
 		if(value==GL_NONE)
@@ -26,6 +31,9 @@ OpenGLSystemFramebuffer::OpenGLSystemFramebuffer():
 		glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
 		if(value!=GL_NONE)
 			sys_format = (sys_format, STENCIL_ATTACHMENT);
+
+		if(old_id)
+			glBindFramebuffer(GL_DRAW_FRAMEBUFFER_BINDING, old_id);
 	}
 	else
 		// Make a guess if we can't query the format