Commit: b02b54323f0284b70140d99c9986d75a317a80e2
Author: Campbell Barton
Date: Tue Oct 20 12:47:44 2015 +1100
Branches: framebuffer
https://developer.blender.org/rBb02b54323f0284b70140d99c9986d75a317a80e2
Minor updates to the example
- Add cancel() callback so exiting doesn't leak memory.
- Use staticmethods where 'self' isnt used.
- One line comment explaining what it does.
===================================================================
M doc/python_api/examples/gpu.offscreen.1.py
===================================================================
diff --git a/doc/python_api/examples/gpu.offscreen.1.py
b/doc/python_api/examples/gpu.offscreen.1.py
index 071b88e..2febb97 100644
--- a/doc/python_api/examples/gpu.offscreen.1.py
+++ b/doc/python_api/examples/gpu.offscreen.1.py
@@ -1,87 +1,56 @@
+# Draws an off-screen buffer and display it in the corner of the view.
import bpy
from bgl import *
-class VIEW3D_OT_OffScreenDraw(bpy.types.Operator):
- """"""
+
+class OffScreenDraw(bpy.types.Operator):
bl_idname = "view3d.offscreen_draw"
- bl_label = "Offscreen Draw"
+ bl_label = "View3D Offscreen Draw"
_handle_calc = None
_handle_draw = None
is_enabled = False
- @classmethod
- def poll(cls, context):
- return context.area.type == 'VIEW_3D'
+ # manage draw handler
+ @staticmethod
+ def draw_callback_px(self, context):
+ scene = context.scene
+ aspect_ratio = scene.render.resolution_x / scene.render.resolution_y
+
+ self._update_offscreen(context, self._offscreen)
+ self._opengl_draw(context, self._texture, aspect_ratio, 0.2)
@staticmethod
def handle_add(self, context):
- VIEW3D_OT_OffScreenDraw._handle_draw =
bpy.types.SpaceView3D.draw_handler_add(
- self.draw_callback_px, (context, ), 'WINDOW', 'POST_PIXEL')
+ OffScreenDraw._handle_draw = bpy.types.SpaceView3D.draw_handler_add(
+ self.draw_callback_px, (self, context),
+ 'WINDOW', 'POST_PIXEL',
+ )
@staticmethod
def handle_remove():
- if VIEW3D_OT_OffScreenDraw._handle_draw is not None:
-
bpy.types.SpaceView3D.draw_handler_remove(VIEW3D_OT_OffScreenDraw._handle_draw,
'WINDOW')
-
- VIEW3D_OT_OffScreenDraw._handle_draw = None
-
- def modal(self, context, event):
- if context.area:
- context.area.tag_redraw()
+ if OffScreenDraw._handle_draw is not None:
+
bpy.types.SpaceView3D.draw_handler_remove(OffScreenDraw._handle_draw, 'WINDOW')
- return {'PASS_THROUGH'}
+ OffScreenDraw._handle_draw = None
- def invoke(self, context, event):
- if VIEW3D_OT_OffScreenDraw.is_enabled:
- VIEW3D_OT_OffScreenDraw.handle_remove()
- VIEW3D_OT_OffScreenDraw.is_enabled = False
-
- if context.area:
- context.area.tag_redraw()
-
- return {'FINISHED'}
-
- else:
- if not self.init(context):
- self.report({'ERROR'}, "Error initializing offscreen buffer.
More details in the console")
- return {'CANCELLED'}
-
- VIEW3D_OT_OffScreenDraw.handle_add(self, context)
- VIEW3D_OT_OffScreenDraw.is_enabled = True
-
- if context.area:
- context.area.tag_redraw()
-
- context.window_manager.modal_handler_add(self)
- return {'RUNNING_MODAL'}
-
- def init(self, context):
+ # off-screen buffer
+ @staticmethod
+ def _setup_offscreen(context):
import gpu
scene = context.scene
aspect_ratio = scene.render.resolution_x / scene.render.resolution_y
try:
- self._offscreen = gpu.offscreen.new(512, int(512 / aspect_ratio),
0)
- self._texture = self._offscreen.color_texture
-
- except Exception as E:
- print(E)
- return False
+ offscreen = gpu.offscreen.new(512, int(512 / aspect_ratio))
+ except Exception as e:
+ print(e)
+ offscreen = None
- if not self._offscreen:
- return False
+ return offscreen
- return True
-
- def draw_callback_px(self, context):
- scene = context.scene
- aspect_ratio = scene.render.resolution_x / scene.render.resolution_y
-
- self._update_offscreen(context, self._offscreen)
- self._opengl_draw(context, self._texture, aspect_ratio, 0.2)
-
- def _update_offscreen(self, context, offscreen):
+ @staticmethod
+ def _update_offscreen(context, offscreen):
scene = context.scene
camera = scene.camera
@@ -93,12 +62,15 @@ class VIEW3D_OT_OffScreenDraw(bpy.types.Operator):
context.space_data,
context.region,
projection_matrix,
- modelview_matrix)
+ modelview_matrix,
+ )
- def _opengl_draw(self, context, texture, aspect_ratio, scale):
+ @staticmethod
+ def _opengl_draw(context, texture, aspect_ratio, scale):
"""
OpenGL code to draw a rectangle in the viewport
"""
+
glDisable(GL_DEPTH_TEST)
# view setup
@@ -111,7 +83,7 @@ class VIEW3D_OT_OffScreenDraw(bpy.types.Operator):
glLoadIdentity()
glOrtho(-1, 1, -1, 1, -15, 15)
- gluLookAt(0.0, 0.0, 1.0, 0.0,0.0,0.0, 0.0,1.0,0.0)
+ gluLookAt(0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
act_tex = Buffer(GL_INT, 1)
glGetIntegerv(GL_TEXTURE_2D, act_tex)
@@ -131,10 +103,10 @@ class VIEW3D_OT_OffScreenDraw(bpy.types.Operator):
glBindTexture(GL_TEXTURE_2D, texture)
- texco = [(1, 1), (0, 1), (0, 0), (1,0)]
+ texco = [(1, 1), (0, 1), (0, 0), (1, 0)]
verco = [(1.0, 1.0), (-1.0, 1.0), (-1.0, -1.0), (1.0, -1.0)]
- glPolygonMode(GL_FRONT_AND_BACK , GL_FILL)
+ glPolygonMode(GL_FRONT_AND_BACK, GL_FILL)
glColor4f(1.0, 1.0, 1.0, 1.0)
@@ -159,13 +131,54 @@ class VIEW3D_OT_OffScreenDraw(bpy.types.Operator):
glViewport(viewport[0], viewport[1], viewport[2], viewport[3])
glScissor(viewport[0], viewport[1], viewport[2], viewport[3])
+ # operator functions
+ @classmethod
+ def poll(cls, context):
+ return context.area.type == 'VIEW_3D'
+
+ def modal(self, context, event):
+ if context.area:
+ context.area.tag_redraw()
+
+ return {'PASS_THROUGH'}
+
+ def invoke(self, context, event):
+ if OffScreenDraw.is_enabled:
+ self.cancel(context)
+
+ return {'FINISHED'}
+
+ else:
+ self._offscreen = OffScreenDraw._setup_offscreen(context)
+ if self._offscreen:
+ self._texture = self._offscreen.color_texture
+ else:
+ self.report({'ERROR'}, "Error initializing offscreen buffer.
More details in the console")
+ return {'CANCELLED'}
+
+ OffScreenDraw.handle_add(self, context)
+ OffScreenDraw.is_enabled = True
+
+ if context.area:
+ context.area.tag_redraw()
+
+ context.window_manager.modal_handler_add(self)
+ return {'RUNNING_MODAL'}
+
+ def cancel(self, context):
+ OffScreenDraw.handle_remove()
+ OffScreenDraw.is_enabled = False
+
+ if context.area:
+ context.area.tag_redraw()
+
def register():
- bpy.utils.register_class(VIEW3D_OT_OffScreenDraw)
+ bpy.utils.register_class(OffScreenDraw)
def unregister():
- bpy.utils.unregister_class(VIEW3D_OT_OffScreenDraw)
+ bpy.utils.unregister_class(OffScreenDraw)
if __name__ == "__main__":
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