Rendering System

Rendering System of SecondLife Viewer 1.22

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

• check window state

• check if in startup state (don't render)

• if in teleport mode draw static screen and progress bar

• if logout requested don't draw

prepare for next frame:

• update camera

• clear buffer, for drawing of dynamic textures

• setup rendering

• reset lights to SL 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

• update sky

redraw 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

for each drawpool:

- render faces to vertex buffer

- render vertex buffer to frame buffer (?)