source: code/trunk/Tutorial/Media/materials/scripts/Examples.compositor @ 56

// Manuel's bloom
// Needs a scene-sized rtt, but does only one render of the scene
compositor Bloom
{
    technique
    {
        // Temporary textures
        texture rt0 128 128 PF_A8R8G8B8
        texture rt1 128 128 PF_A8R8G8B8

        target rt1
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target rt0
        {
            // Start with clear texture
            input none
            // Vertical blur pass
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/Blur0
                input 0 rt1
            }
        }

        target rt1
        {
            // Start with clear texture
            input none
            // Horizontal blur pass
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/Blur1
                input 0 rt0
            }
        }

        target_output
        {
            // Start with clear output
            input previous
            // Draw a fullscreen quad
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/BloomBlend
                input 0 rt1
            }
        }
    }
}

compositor Glass
{
    technique
    {
        texture rt0 target_width target_height PF_R8G8B8

        target rt0 { input previous }

        target_output
        {
            // Start with clear output
            input none

            pass render_quad
            {
                material Ogre/Compositor/GlassPass
                input 0 rt0
            }
        }
    }
}

compositor "Old TV"
{
    technique
    {
        texture rt0 target_width target_height PF_R8G8B8

        // render scene to a texture
        target rt0 { input previous }

        target_output
        {
            // Start with clear output
            input none

            pass render_quad
            {
                // convert the previous render target to a black and white image, add some noise, distort it,
                // then render to scene aligned quad
                material Ogre/Compositor/OldTV
                input 0 rt0
            }
        }
    }
}


// Black and white effect
compositor B&W
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/BlackAndWhite
                input 0 rt0
            }
        }
    }
}

//compositor DOF // based on Blur but final pass does depth of field
//{
//    technique
//    {
//        // Temporary textures
//        texture rt0 target_width target_height PF_A8R8G8B8
//        texture rt1 target_width target_height PF_A8R8G8B8
//
//        target rt1
//        {
//            // Render output from previous compositor (or original scene)
//            input previous
//        }
//
//        target rt0
//        {
//            // Start with clear texture
//            input none
//            // Vertical blur pass
//            pass render_quad
//            {
//                // Renders a fullscreen quad with a material
//                material Ogre/Compositor/DOF_Blur0
//                input 0 rt1
//            }
//        }
//
//        target rt1
//        {
//            // Start with clear texture
//            input none
//            // Horizontal blur pass
//            pass render_quad
//            {
//                // Renders a fullscreen quad with a material
//                material Ogre/Compositor/DOF_Blur1
//                input 0 rt0
//            }
//        }
//
//        target_output
//        {
//            // Start with clear output
//            input none
//            // Draw a fullscreen quad
//            pass render_quad
//            {
//                // Renders a fullscreen quad with a material
//                material Ogre/Compositor/DOF_Blend
//                input 0 rt0
//                input 1 rt1
//            }
//        }
//    }
//}

// Embossed (fake bump) effect
compositor Embossed
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/Embossed
                input 0 rt0
            }
        }
    }
}

// SharpenEdges
compositor Sharpen Edges
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/SharpenEdges
                input 0 rt0
            }
        }
    }
}

// Invert
compositor Invert
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/Invert
                input 0 rt0
            }
        }
    }
}

// Posterize
compositor Posterize
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/Posterize
                input 0 rt0
            }
        }
    }
}

// Laplace
compositor Laplace
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/Laplace
                input 0 rt0
            }
        }
    }
}

// Tiling
compositor Tiling
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/Tiling
                input 0 rt0
            }
        }
    }
}

// Old Movie
compositor Old Movie
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target_output
        {
            // Start with clear output
            input none
            // Draw a fullscreen quad with the black and white image
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                material Ogre/Compositor/OldMovie
                input 0 rt0
            }
        }
    }
}

// HDR
compositor HDR
{
        // floating point only for now
        technique
        {
        // Temporary textures
                // Fullsize HDR render target, used as tone mapping source
        texture rt_full target_width target_height PF_FLOAT16_RGB
                // Targets used for luminance evaluation (3x3 downsample, point filtering)
                texture rt_lum0 1 1 PF_FLOAT16_RGB
                texture rt_lum1 4 4 PF_FLOAT16_RGB
                texture rt_lum2 16 16 PF_FLOAT16_RGB
                texture rt_lum3 64 64 PF_FLOAT16_RGB
                texture rt_lum4 128 128 PF_FLOAT16_RGB
                // Bright-pass filtered target (tone mapped)
                texture rt_brightpass 128 128 PF_R8G8B8
                // Bloom filter targets
                texture rt_bloom0 128 128 PF_R8G8B8
                texture rt_bloom1 128 128 PF_R8G8B8


                target rt_full
                {
                        // No input, render differently
                        input none

                        // Use float target HDR material scheme (unclamped shaders)
                        material_scheme HDR

                        pass clear
                        {
                        }

                        pass render_scene
                        {
                        }

                }

                // Downsample the original HDR scene to extract luminence value
                target rt_lum4
                {
            input none
            pass render_quad
            {
                // Downsample using a 2x2 filter and convert to greyscale
                material Ogre/Compositor/HDR/Downsample2x2Luminence
                input 0 rt_full
                identifier 994
            }
                }
                target rt_lum3
                {
            input none
            pass render_quad
            {
                                // Downsample using a 3x3 filter
                material Ogre/Compositor/HDR/Downsample3x3
                input 0 rt_lum4
                identifier 993
            }
                }
                target rt_lum2
                {
            input none
            pass render_quad
            {
                // Downsample using a 3x3 filter
                material Ogre/Compositor/HDR/Downsample3x3
                input 0 rt_lum3
                identifier 992
            }
                }
                target rt_lum1
                {
            input none
            pass render_quad
            {
                // Downsample using a 3x3 filter
                material Ogre/Compositor/HDR/Downsample3x3
                input 0 rt_lum2
                identifier 991
            }
                }
                target rt_lum0
                {
            input none
            pass render_quad
            {
                // Downsample using a 3x3 filter
                material Ogre/Compositor/HDR/Downsample3x3
                input 0 rt_lum1
                identifier 990
            }
                }


                target rt_brightpass
                {
            input none
            pass render_quad
            {
                // Downsample using a 3x3 filter, hi-pass and tone map
                material Ogre/Compositor/HDR/Downsample3x3Brightpass
                input 0 rt_full
                        input 1 rt_lum0
                                identifier 800
            }
                }

                target rt_bloom1
                {
                        input none
                        pass render_quad
                        {
                                // Blur horizontally
                                material Ogre/Compositor/HDR/GaussianBloom
                                input 0 rt_brightpass
                                identifier 701
                        }
                }
                target rt_bloom0
                {
                        input none
                        pass render_quad
                        {
                                // Blur horizontally
                                material Ogre/Compositor/HDR/GaussianBloom
                                input 0 rt_bloom1
                                identifier 700
                        }
                }


                // Final output combines tone mapping of the original scene, with an
                // exposure setting passed in as a GPU parameter, and an additive bloom
                // effect
                target_output
                {
                        input none
                        pass render_quad
                        {
                                material Ogre/Compositor/HDR/ToneMapping
                                input 0 rt_full
                                input 1 rt_bloom0
                                input 2 rt_lum0
                        }
                }


        }

}


// Gaussian blur effect
compositor Gaussian Blur
{
    technique
    {
        // Temporary textures
        texture rt0 target_width target_height PF_A8R8G8B8
        texture rt1 target_width target_height PF_A8R8G8B8

        target rt0
        {
            // Render output from previous compositor (or original scene)
            input previous
        }

        target rt1
        {
            // Blur horizontally
            input none
                        pass render_quad
                        {
                                material Ogre/Compositor/HDR/GaussianBloom
                                input 0 rt0
                                identifier 700
                        }
        }

                target_output
        {
            // Start with clear output
            input none
            // Blur vertically
            pass render_quad
            {
                // Renders a fullscreen quad with a material
                                material Ogre/Compositor/HDR/GaussianBloom
                input 0 rt1
                                identifier 701
            }
        }
    }
}