GPU Pro 6

356 V Mobile Devices

Lighting Buffer(s)

Lighting calculations

executed in screen

space

Material ID

Normals

World-Space

Positions

Final Result Frame

Render the scene into

a deep frame buffer

(G-buffer)

G-Buffer

Assemble the final

frame and perform

screen-space effects

Compute lighting on

each G-buffer pixel

(no overdraw)

Figure 1.4. Deferred shading pipeline.

uniform sampler2D normalTexture ;

uniform sampler2D positionTexture ;

void main ()

{

vec2 uv = rl_FrameCoord . xy / rl_FrameSize . xy ;

vec4 normal = texture2D ( normalTexture , uv );

vec4 position = texture2D( positionTexture , uv ;

if( normal . w ==0.0) return ; //No fragment was rendered for this

// pix el

IlluminateSurface ...