diff --git a/src/gl/renderer/gl_renderbuffers.cpp b/src/gl/renderer/gl_renderbuffers.cpp
index abf32500a4..c4f1b5fee3 100644
--- a/src/gl/renderer/gl_renderbuffers.cpp
+++ b/src/gl/renderer/gl_renderbuffers.cpp
@@ -280,12 +280,7 @@ int FGLRenderBuffers::GetCvarSamples()
 	int maxSamples = 0;
 	glGetIntegerv(GL_MAX_SAMPLES, &maxSamples);
 
-	int samples = clamp((int)gl_multisample, 0, maxSamples);
-
-	int count;
-	for (count = 0; samples > 0; count++)
-		samples >>= 1;
-	return count;
+	return clamp((int)gl_multisample, 0, maxSamples);
 }
 
 //==========================================================================
@@ -452,6 +447,13 @@ void FGLRenderBuffers::BlitSceneToTexture()
 	glBindFramebuffer(GL_READ_FRAMEBUFFER, mSceneFB);
 	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mPipelineFB[mCurrentPipelineTexture]);
 	glBlitFramebuffer(0, 0, mWidth, mHeight, 0, 0, mWidth, mHeight, GL_COLOR_BUFFER_BIT, GL_NEAREST);
+
+	if ((gl.flags & RFL_INVALIDATE_BUFFER) == 0)
+	{
+		GLenum attachments[2] = { GL_COLOR_ATTACHMENT0, GL_DEPTH_STENCIL_ATTACHMENT };
+		glInvalidateFramebuffer(GL_READ_FRAMEBUFFER, 2, attachments);
+	}
+
 	glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
 }