289 lines
8.6 KiB
GDScript
289 lines
8.6 KiB
GDScript
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# Core logic to paint a texture using shaders, with undo/redo support.
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# Operations are delayed so results are only available the next frame.
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# This doesn't implement UI, only the painting logic.
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#
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# Note: due to the absence of channel separation function in Image,
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# you may need to use multiple painters at once if your application exploits multiple channels.
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# Example: when painting a heightmap, it would be doable to output height in R, normalmap in GB, and
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# then separate channels in two images at the end.
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tool
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extends Node
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const Logger = preload("../../util/logger.gd")
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const Util = preload("../../util/util.gd")
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const UNDO_CHUNK_SIZE = 64
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const BRUSH_TEXTURE_SHADER_PARAM = "u_brush_texture"
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# Emitted when a region of the painted texture actually changed.
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# Note 1: the image might not have changed yet at this point.
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# Note 2: the user could still be in the middle of dragging the brush.
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signal texture_region_changed(rect)
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# Godot doesn't support 32-bit float rendering, so painting is limited to 16-bit depth.
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# We should get this in Godot 4.0, either as Compute or renderer improvement
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const _hdr_formats = [
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Image.FORMAT_RH,
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Image.FORMAT_RGH,
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Image.FORMAT_RGBH,
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Image.FORMAT_RGBAH
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]
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const _supported_formats = [
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Image.FORMAT_R8,
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Image.FORMAT_RG8,
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Image.FORMAT_RGB8,
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Image.FORMAT_RGBA8,
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Image.FORMAT_RH,
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Image.FORMAT_RGH,
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Image.FORMAT_RGBH,
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Image.FORMAT_RGBAH
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]
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var _viewport : Viewport
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var _viewport_sprite : Sprite
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var _brush_size := 32
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var _brush_position := Vector2()
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var _brush_texture : Texture
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var _last_brush_position := Vector2()
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var _brush_material := ShaderMaterial.new()
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var _image : Image
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var _texture : ImageTexture
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var _cmd_paint := false
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var _pending_paint_render := false
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var _modified_chunks := {}
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var _modified_shader_params := {}
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var _debug_display : TextureRect
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var _logger = Logger.get_for(self)
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func _ready():
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if Util.is_in_edited_scene(self):
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return
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_viewport = Viewport.new()
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_viewport.size = Vector2(_brush_size, _brush_size)
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_viewport.render_target_update_mode = Viewport.UPDATE_ONCE
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_viewport.render_target_v_flip = true
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_viewport.render_target_clear_mode = Viewport.CLEAR_MODE_ONLY_NEXT_FRAME
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_viewport.hdr = false
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_viewport.transparent_bg = true
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# Apparently HDR doesn't work if this is set to 2D... so let's waste a depth buffer :/
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#_viewport.usage = Viewport.USAGE_2D
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#_viewport.keep_3d_linear
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_viewport_sprite = Sprite.new()
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_viewport_sprite.centered = false
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_viewport_sprite.material = _brush_material
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_viewport.add_child(_viewport_sprite)
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add_child(_viewport)
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func set_debug_display(dd: TextureRect):
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_debug_display = dd
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_debug_display.texture = _viewport.get_texture()
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func set_image(image: Image, texture: ImageTexture):
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assert((image == null and texture == null) or (image != null and texture != null))
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_image = image
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_texture = texture
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_viewport_sprite.texture = _texture
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if image != null:
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_viewport.hdr = image.get_format() in _hdr_formats
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#print("PAINTER VIEWPORT HDR: ", _viewport.hdr)
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func set_brush_size(new_size: int):
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_brush_size = new_size
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func get_brush_size() -> int:
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return _brush_size
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func set_brush_texture(texture: Texture):
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_brush_material.set_shader_param(BRUSH_TEXTURE_SHADER_PARAM, texture)
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func set_brush_shader(shader: Shader):
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if _brush_material.shader != shader:
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_brush_material.shader = shader
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func set_brush_shader_param(p: String, v):
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_modified_shader_params[p] = true
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_brush_material.set_shader_param(p, v)
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func clear_brush_shader_params():
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for key in _modified_shader_params:
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_brush_material.set_shader_param(key, null)
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_modified_shader_params.clear()
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# You must call this from an `_input` function or similar.
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func paint_input(center_pos: Vector2):
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var vp_size = Vector2(_brush_size, _brush_size)
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if _viewport.size != vp_size:
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# Do this lazily so the brush slider won't lag while adjusting it
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# TODO An "sliding_ended" handling might produce better user experience
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_viewport.size = vp_size
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# Need to floor the position in case the brush has an odd size
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var brush_pos := (center_pos - Vector2(_brush_size, _brush_size) * 0.5).round()
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_viewport.render_target_update_mode = Viewport.UPDATE_ONCE
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_viewport_sprite.position = -brush_pos
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_brush_position = brush_pos
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_cmd_paint = true
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# Using a Color because Godot doesn't understand vec4
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var rect := Color()
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rect.r = brush_pos.x / _texture.get_width()
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rect.g = brush_pos.y / _texture.get_height()
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rect.b = _brush_size / _texture.get_width()
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rect.a = _brush_size / _texture.get_height()
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_brush_material.set_shader_param("u_texture_rect", rect)
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# Don't commit until this is false
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func is_operation_pending() -> bool:
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return _pending_paint_render or _cmd_paint
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# Applies changes to the Image, and returns modified chunks for UndoRedo.
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func commit() -> Dictionary:
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if is_operation_pending():
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_logger.error("Painter commit() was called while an operation is still pending")
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return _commit_modified_chunks()
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func has_modified_chunks() -> bool:
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return len(_modified_chunks) > 0
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func _process(delta: float):
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if _pending_paint_render:
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_pending_paint_render = false
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#print("Paint result at frame ", Engine.get_frames_drawn())
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var data := _viewport.get_texture().get_data()
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data.convert(_image.get_format())
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var brush_pos = _last_brush_position
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var dst_x : int = clamp(brush_pos.x, 0, _texture.get_width())
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var dst_y : int = clamp(brush_pos.y, 0, _texture.get_height())
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var src_x : int = max(-brush_pos.x, 0)
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var src_y : int = max(-brush_pos.y, 0)
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var src_w : int = min(max(_brush_size - src_x, 0), _texture.get_width() - dst_x)
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var src_h : int = min(max(_brush_size - src_y, 0), _texture.get_height() - dst_y)
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if src_w != 0 and src_h != 0:
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_mark_modified_chunks(dst_x, dst_y, src_w, src_h)
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VisualServer.texture_set_data_partial(
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_texture.get_rid(), data, src_x, src_y, src_w, src_h, dst_x, dst_y, 0, 0)
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emit_signal("texture_region_changed", Rect2(dst_x, dst_y, src_w, src_h))
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# Input is handled just before process, so we still have to wait till next frame
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if _cmd_paint:
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_pending_paint_render = true
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_last_brush_position = _brush_position
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# Consume input
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_cmd_paint = false
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func _mark_modified_chunks(bx: int, by: int, bw: int, bh: int):
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var cs := UNDO_CHUNK_SIZE
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var cmin_x := bx / cs
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var cmin_y := by / cs
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var cmax_x := (bx + bw - 1) / cs + 1
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var cmax_y := (by + bh - 1) / cs + 1
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for cy in range(cmin_y, cmax_y):
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for cx in range(cmin_x, cmax_x):
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_modified_chunks[Vector2(cx, cy)] = true
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func _commit_modified_chunks() -> Dictionary:
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var time_before := OS.get_ticks_msec()
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var cs := UNDO_CHUNK_SIZE
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var chunks_positions := []
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var chunks_initial_data := []
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var chunks_final_data := []
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#_logger.debug("About to commit ", len(_modified_chunks), " chunks")
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# TODO get_data_partial() would be nice...
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var final_image := _texture.get_data()
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for cpos in _modified_chunks:
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var cx : int = cpos.x
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var cy : int = cpos.y
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var x := cx * cs
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var y := cy * cs
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var w : int = min(cs, _image.get_width() - x)
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var h : int = min(cs, _image.get_height() - y)
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var rect := Rect2(x, y, w, h)
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var initial_data := _image.get_rect(rect)
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var final_data := final_image.get_rect(rect)
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chunks_positions.append(cpos)
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chunks_initial_data.append(initial_data)
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chunks_final_data.append(final_data)
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#_image_equals(initial_data, final_data)
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# TODO We could also just replace the image with `final_image`...
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# TODO Use `final_data` instead?
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_image.blit_rect(final_image, rect, rect.position)
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_modified_chunks.clear()
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var time_spent := OS.get_ticks_msec() - time_before
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_logger.debug("Spent {0} ms to commit paint operation".format([time_spent]))
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return {
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"chunk_positions": chunks_positions,
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"chunk_initial_datas": chunks_initial_data,
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"chunk_final_datas": chunks_final_data
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}
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# DEBUG
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#func _input(event):
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# if event is InputEventKey:
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# if event.pressed:
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# if event.control and event.scancode == KEY_SPACE:
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# print("Saving painter viewport ", name)
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# var im = _viewport.get_texture().get_data()
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# im.convert(Image.FORMAT_RGBA8)
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# im.save_png(str("test_painter_viewport_", name, ".png"))
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#static func _image_equals(im_a: Image, im_b: Image) -> bool:
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# if im_a.get_size() != im_b.get_size():
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# print("Diff size: ", im_a.get_size, ", ", im_b.get_size())
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# return false
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# if im_a.get_format() != im_b.get_format():
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# print("Diff format: ", im_a.get_format(), ", ", im_b.get_format())
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# return false
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# im_a.lock()
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# im_b.lock()
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# for y in im_a.get_height():
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# for x in im_a.get_width():
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# var ca = im_a.get_pixel(x, y)
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# var cb = im_b.get_pixel(x, y)
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# if ca != cb:
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# print("Diff pixel ", x, ", ", y)
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# return false
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# im_a.unlock()
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# im_b.unlock()
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# print("SAME")
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# return true
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