Tiled Forward Shading Johan Medeström

Project Goals Render a scene with lots of lights Learn more OpenGL and shading techniques Learn more about OpenCL/Compute shaders

What I researched OpenGL 4.3 functionality Compute Shaders OpenCL CPU based methods Ended up with Compute Shaders due to familiarity

Tiled Shading Divide screen into 16x16 or (32x32, 64x ) pixel tiles Calculate which lights affect a tile Use compute shaders to increase performance Calculate lighting per tile

Tiled Deferred Shading

Early tests Lots of lights are supported with good framerates 4096 small point lights

Final Results Both techniques running steady at 60 fps 2048 light sources support

Performance results

Demo time!