OSviewer/Rendering System - Revision history

CodyCooper at 00:06, 10 December 2018

2018-12-10T00:06:43Z

CodyCooper: Replaced content with "== Rendering System of OpenSimulator Viewer v1 == The OSviewer uses Unreal Engine to render its awesomness Category:OSviewer"

2018-12-08T17:11:40Z

Replaced content with "== Rendering System of OpenSimulator Viewer v1 == The OSviewer uses Unreal Engine to render its awesomness Category:OSviewer"

CodyCooper at 16:58, 16 November 2018

2018-11-16T16:58:39Z

CodyCooper: Adding Current Stuff From Second Life Wiki from old Viewer

2018-11-16T16:57:47Z

Adding Current Stuff From Second Life Wiki from old Viewer

New page

== Rendering System of OpenSimulator Viewer v1 ==

The OpenSimulator Viewer uses OpenGL to interface with the graphics hardware. (Should this be replaced or should it remain the same?)

Rendering in the viewer starts in llviewerdisplay.cpp in the display() method.

Rendering follows this flow of events:

* check window state and client state

Don't render if window is minimized.

Don't render if client is in startup state.

If client is in teleport mode only draw a static screen and progress bar.

If client requested a logout don't draw anything else.

'''prepare for next frame:'''

* update camera

* clear buffer, for drawing of dynamic textures

* setup rendering

* reset lights to OS defaults

'''update window and dynamic textures:'''

* update (draw) dynamic(/render-to-texture) textures

for each dynamic texture:

-> save camera and viewport and clear the depthbuffer if required

-> render to framebuffer

-> use glCopyTexSubImage2D to copy results to texture

-> restore camera and viewport

* if any dynamic textures were updated clear color and depth buffer

* set viewport up (with offsets and window dimensions)

'''update scene:'''

* set camera up

display_camera_update() creates projection matrix and clip distance

* update HUD

* update geometry

* cull geometry

* clear/flush last frame

* update images (?)

* state sorting

* rebuild draw pools

Seems just to remove dead pools from the list of pools.

* update sky

Redraws skytexture and cubic environment map.

'''draw geometry'''

* if render scene to texture (if vertex shaders supported) bind frame buffer to FBO

* render pipeline

unbind vertex buffers (?)

set safe default state values (matrices and stuff)

set fog and lights

render drawpools

Drawpools represent either a set of polygons (LLFacePool) or a renderpass (LLRenderPass). There are different types of either kind.

''Facepools'' are grouped in Terrain, Ground, Tree, Avatar, Water, Sky and WLSky. There maybe multiple facepools of each type (one per spatial partition?).

''Renderpasses'' can be Simple, Alpha, Glow, Invisible or Bump passes. There is one instance of each renderpass draw pool.

for each drawpool:

- set up vertex buffer and texture

- render faces to vertex buffer

- render vertex buffer to frame buffer (?)

Source is from http://wiki.secondlife.com/wiki/Rendering_System

← Older revision		Revision as of 16:58, 16 November 2018
Line 100:		Line 100:

	Source is from http://wiki.secondlife.com/wiki/Rendering_System		Source is from http://wiki.secondlife.com/wiki/Rendering_System
		+	[[Category:OSviewer]]

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 == Rendering System of OpenSimulator Viewer v1 ==
 The OSviewer uses Unreal Engine to render its awesomness
 [[Category:OSviewer]]

@@ Line 1: / Line 1: @@
 == Rendering System of OpenSimulator Viewer v1 ==
-The OpenSimulator Viewer uses OpenGL to interface with the graphics hardware. (Should this be replaced or should it remain the same?)
+The OSviewer uses Unreal Engine to render its awesomness
-−
-Rendering in the viewer starts in llviewerdisplay.cpp in the display() method.
-−
-Rendering follows this flow of events:
-−
-* check window state and client state
-−
-Don't render if window is minimized.
-−
-Don't render if client is in startup state.
-−
-If client is in teleport mode only draw a static screen and progress bar.
-−
-If client requested a logout don't draw anything else.
-−
-'''prepare for next frame:'''
-−
-* update camera
-−
-* clear buffer, for drawing of dynamic textures
-−
-* setup rendering
-−
-* reset lights to OS defaults
-−
-'''update window and dynamic textures:'''
-−
-* update (draw) dynamic(/render-to-texture) textures
-−
-for each dynamic texture:
-−
--> save camera and viewport and clear the depthbuffer if required
-−
--> render to framebuffer
-−
--> use glCopyTexSubImage2D to copy results to texture
-−
--> restore camera and viewport
-−
-* if any dynamic textures were updated clear color and depth buffer
-−
-* set viewport up (with offsets and window dimensions)
-−
-'''update scene:'''
-−
-* set camera up
-−
-display_camera_update() creates projection matrix and clip distance
-−
-* update HUD
-−
-* update geometry
-−
-* cull geometry
-−
-* clear/flush last frame
-−
-* update images (?)
-−
-* state sorting
-−
-* rebuild draw pools
-−
-Seems just to remove dead pools from the list of pools.
-−
-* update sky
-−
-Redraws skytexture and cubic environment map.
-−
-'''draw geometry'''
-−
-* if render scene to texture (if vertex shaders supported) bind frame buffer to FBO
-−
-* render pipeline
-−
-unbind vertex buffers (?)
-−
-set safe default state values (matrices and stuff)
-−
-set fog and lights
-−
-render drawpools
-−
-Drawpools represent either a set of polygons (LLFacePool) or a renderpass (LLRenderPass). There are different types of either kind.
-−
-''Facepools'' are grouped in Terrain, Ground, Tree, Avatar, Water, Sky and WLSky. There maybe multiple facepools of each type (one per spatial partition?).
-−
-''Renderpasses'' can be Simple, Alpha, Glow, Invisible or Bump passes. There is one instance of each renderpass draw pool.
-−
-for each drawpool:
-−
-- set up vertex buffer and texture
-−
-- render faces to vertex buffer
-−
-- render vertex buffer to frame buffer (?)
-−
-Source is from http://wiki.secondlife.com/wiki/Rendering_System
 [[Category:OSviewer]]