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# Copyright (c) 2020 Ultimaker B.V.
# Uranium is released under the terms of the LGPLv3 or higher.
import enum
import random
from typing import TYPE_CHECKING
from UM.Resources import Resources
from UM.Application import Application
from UM.Math.Color import Color
from UM.Scene.Selection import Selection
from UM.Scene.ToolHandle import ToolHandle
from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator
from UM.View.RenderPass import RenderPass
from UM.View.RenderBatch import RenderBatch
from UM.View.GL.OpenGL import OpenGL
if TYPE_CHECKING:
from UM.Scene.SceneNode import SceneNode
class SelectionPass(RenderPass):
"""A RenderPass subclass responsible for rendering selectable objects to a texture.
This pass performs the rendering of selectable objects to a texture that can be
sampled to retrieve the actual object that was underneath the mouse cursor. Additionally,
information about what objects are actually selected is rendered into the alpha channel
of this render pass so it can be used later on in the composite pass.
"""
class SelectionMode(enum.Enum):
OBJECTS = "objects"
FACES = "faces"
def __init__(self, width, height):
super().__init__("selection", width, height, -999)
self._shader = OpenGL.getInstance().createShaderProgram(Resources.getPath(Resources.Shaders, "selection.shader"))
self._face_shader = OpenGL.getInstance().createShaderProgram(Resources.getPath(Resources.Shaders, "select_face.shader"))
self._tool_handle_shader = OpenGL.getInstance().createShaderProgram(Resources.getPath(Resources.Shaders, "default.shader"))
self._gl = OpenGL.getInstance().getBindingsObject()
self._scene = Application.getInstance().getController().getScene()
self._renderer = Application.getInstance().getRenderer()
self._selection_map = {}
self._default_toolhandle_selection_map = {
self._dropAlpha(ToolHandle.DisabledSelectionColor): ToolHandle.NoAxis,
self._dropAlpha(ToolHandle.XAxisSelectionColor): ToolHandle.XAxis,
self._dropAlpha(ToolHandle.YAxisSelectionColor): ToolHandle.YAxis,
self._dropAlpha(ToolHandle.ZAxisSelectionColor): ToolHandle.ZAxis,
self._dropAlpha(ToolHandle.AllAxisSelectionColor): ToolHandle.AllAxis,
ToolHandle.DisabledSelectionColor: ToolHandle.NoAxis,
ToolHandle.XAxisSelectionColor: ToolHandle.XAxis,
ToolHandle.YAxisSelectionColor: ToolHandle.YAxis,
ToolHandle.ZAxisSelectionColor: ToolHandle.ZAxis,
ToolHandle.AllAxisSelectionColor: ToolHandle.AllAxis
}
self._toolhandle_selection_map = {}
Application.getInstance().getController().activeToolChanged.connect(self._onActiveToolChanged)
self._onActiveToolChanged()
self._mode = SelectionPass.SelectionMode.OBJECTS
Selection.selectedFaceChanged.connect(self._onSelectedFaceChanged)
self._output = None
def _onActiveToolChanged(self):
self._toolhandle_selection_map = self._default_toolhandle_selection_map.copy()
active_tool = Application.getInstance().getController().getActiveTool()
if not active_tool:
return
tool_handle = active_tool.getHandle()
if not tool_handle:
return
for name, color in tool_handle.getExtraWidgetsColorMap().items():
self._toolhandle_selection_map[color] = name
self._toolhandle_selection_map[self._dropAlpha(color)] = name
def _onSelectedFaceChanged(self):
self._mode = SelectionPass.SelectionMode.FACES if Selection.getFaceSelectMode() else SelectionPass.SelectionMode.OBJECTS
def render(self):
"""Perform the actual rendering."""
if self._mode == SelectionPass.SelectionMode.OBJECTS:
self._renderObjectsMode()
elif self._mode == SelectionPass.SelectionMode.FACES:
self._renderFacesMode()
def _renderObjectsMode(self):
self._selection_map = self._toolhandle_selection_map.copy()
batch = RenderBatch(self._shader)
tool_handle = RenderBatch(self._tool_handle_shader, type = RenderBatch.RenderType.Overlay)
selectable_objects = False
for node in DepthFirstIterator(self._scene.getRoot()):
if isinstance(node, ToolHandle):
tool_handle.addItem(node.getWorldTransformation(copy = False), mesh = node.getSelectionMesh())
continue
if node.isSelectable() and node.getMeshData():
selectable_objects = True
batch.addItem(transformation = node.getWorldTransformation(copy = False), mesh = node.getMeshData(), uniforms = { "selection_color": self._getNodeColor(node)}, normal_transformation=node.getCachedNormalMatrix())
self.bind()
if selectable_objects:
batch.render(self._scene.getActiveCamera())
self._gl.glColorMask(self._gl.GL_TRUE, self._gl.GL_TRUE, self._gl.GL_TRUE, self._gl.GL_FALSE)
self._gl.glDisable(self._gl.GL_DEPTH_TEST)
tool_handle.render(self._scene.getActiveCamera())
self._gl.glEnable(self._gl.GL_DEPTH_TEST)
self._gl.glColorMask(self._gl.GL_TRUE, self._gl.GL_TRUE, self._gl.GL_TRUE, self._gl.GL_TRUE)
self.release()
def _renderFacesMode(self):
batch = RenderBatch(self._face_shader)
selectable_objects = False
for node in Selection.getAllSelectedObjects():
if isinstance(node, ToolHandle):
continue # Ignore tool-handles in this mode.
if node.isSelectable() and node.getMeshData():
selectable_objects = True
batch.addItem(transformation = node.getWorldTransformation(copy = False), mesh = node.getMeshData(), normal_transformation=node.getCachedNormalMatrix())
self.bind()
if selectable_objects:
batch.render(self._scene.getActiveCamera())
self.release()
def getIdAtPosition(self, x, y):
"""Get the object id at a certain pixel coordinate."""
output = self.getOutput()
window_size = self._renderer.getWindowSize()
px = round((0.5 + x / 2.0) * window_size[0])
py = round((0.5 + y / 2.0) * window_size[1])
if px < 0 or px > (output.width() - 1) or py < 0 or py > (output.height() - 1):
return None
pixel = output.pixel(px, py)
return self._selection_map.get(Color.fromARGB(pixel), None)
def getFaceIdAtPosition(self, x, y):
"""Get an unique identifier to the face of the polygon at a certain pixel-coordinate."""
output = self.getOutput()
window_size = self._renderer.getWindowSize()
px = round((0.5 + x / 2.0) * window_size[0])
py = round((0.5 + y / 2.0) * window_size[1])
if px < 0 or px > (output.width() - 1) or py < 0 or py > (output.height() - 1):
return -1
face_color = Color.fromARGB(output.pixel(px, py))
if int(face_color.b * 255) % 2 == 0:
return -1
return (
((int(face_color.b * 255.) - 1) << 15) |
(int(face_color.g * 255.) << 8) |
int(face_color.r * 255.)
)
def _getNodeColor(self, node):
while True:
r = random.randint(0, 255)
g = random.randint(0, 255)
b = random.randint(0, 255)
a = 255 if Selection.isSelected(node) or self._isInSelectedGroup(node) else 0
color = Color(r, g, b, a)
if color not in self._selection_map:
break
self._selection_map[color] = id(node)
return color
def _dropAlpha(self, color):
return Color(color.r, color.g, color.b, 0.0)
def _isInSelectedGroup(self, node: "SceneNode") -> bool:
"""
Get whether the given node is in a group that is selected.
:param node: The node to check.
:return: ``True`` if the node is in a selected group, or ``False`` if
it's not.
"""
group_node = node.getParent()
if group_node is None: # Separate node that's not in the scene.
return False # Can never get selected.
while group_node.callDecoration("isGroup"):
if Selection.isSelected(group_node):
return True
group_node = group_node.getParent()
if group_node is None:
return False
return False
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