diff --git a/cinelerra-5.1/cinelerra/vdevicex11.C b/cinelerra-5.1/cinelerra/vdevicex11.C
index 24d1be0..6d87692 100644
--- a/cinelerra-5.1/cinelerra/vdevicex11.C
+++ b/cinelerra-5.1/cinelerra/vdevicex11.C
@@ -333,6 +333,13 @@ void VDeviceX11::new_output_buffer(VFrame **result, int file_colormodel, EDL *ed
 				}
 				break;
 
+			case BC_RGBA_FLOAT:
+			case BC_RGB_FLOAT:
+			if( device->out_config->driver == PLAYBACK_X11_GL 
+				&& !output->use_scrollbars )
+					bitmap_type = BITMAP_PRIMARY;
+				break;
+
 			case BC_YUV420P:
 				if( device->out_config->driver == PLAYBACK_X11_XV &&
 				    window->accel_available(display_colormodel, 0) &&
diff --git a/cinelerra-5.1/guicast/bctexture.C b/cinelerra-5.1/guicast/bctexture.C
index 52787e1..f1fd166 100644
--- a/cinelerra-5.1/guicast/bctexture.C
+++ b/cinelerra-5.1/guicast/bctexture.C
@@ -124,9 +124,9 @@ void BC_Texture::create_texture(int w, int h, int colormodel)
 		glGenTextures(1, (GLuint*)&texture_id);
 		glBindTexture(GL_TEXTURE_2D, (GLuint)texture_id);
 		glEnable(GL_TEXTURE_2D);
-		int internal_format = texture_components == 4 ? GL_RGBA8 : GL_RGB8 ;
+		int internal_format = texture_components == 4 ? GL_RGBA32F : GL_RGB32F ;
 		glTexImage2D(GL_TEXTURE_2D, 0, internal_format, texture_w, texture_h,
-				0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+				0, GL_RGBA, GL_FLOAT, 0);
 		window_id = BC_WindowBase::get_synchronous()->current_window->get_id();
 		BC_WindowBase::get_synchronous()->put_texture(texture_id,
 			texture_w, texture_h, texture_components);