(init
	# Compute viewport size
	(locals aspect-ratio)
	(set aspect-ratio (div 16 9))
	(if (cmp-gt (div $width $aspect-ratio) $height)
		(
			(set vp-height $height)
			(set vp-width (mul $height $aspect-ratio))
		)(
			(set vp-width $width)
			(set vp-height (div $width $aspect-ratio))
		)
	)
	# Viewport location
	(set vp-x (div (sub $width $vp-width) 2))
	(set vp-y (div (sub $height $vp-height) 2))

	(program prg-fullscreen "fullscreen.v.glsl")

	(call scene-init)
	(call dof-init)
	(call bloom-init)
	(call combine-init)
	(call fxaa-init)
)

(frame
	(profiling "Frame render"
		(call scene-render)
		(call dof-render tx-scene-output tx-scene-depth)
		(call bloom-render tx-scene-output)
		(call combine-render tx-dof-pass2 tx-bloom1)
		(call fxaa-render tx-combined)
	)
)


################################################################################
# Scene

(fn scene-init ()
	(texture tx-scene-output rgb-f16 $vp-width $vp-height)
	(texture tx-scene-depth r-f16 $vp-width $vp-height)
	(framebuffer rt-scene
		(color tx-scene-output)
		(color tx-scene-depth))

	(program prg-scene-p1 "scene.f.glsl")
	(pipeline pl-scene-p1 prg-fullscreen prg-scene-p1)

	(odbg tx-scene-output hdr "Scene output")
	(odbg tx-scene-depth depth "Scene depth")

	(input camera-pos-x 0)
	(input camera-pos-y 0)
	(input camera-pos-z 30)
	(input camera-lookat-x 0)
	(input camera-lookat-y 0)
	(input camera-lookat-z 0)
	(input camera-up-x 0)
	(input camera-up-y 1)
	(input camera-up-z 0)
	(input camera-nearplane 2)

	(input raymarcher-iterations 256)
	(input raymarcher-step 1.2)
	(input raymarcher-epsilon .00001)
	(input raymarcher-max-dist 250)
	(input raymarcher-correction 10)

	(input fog .00015)

	(ui-overrides
		(section "Scenes"
			(section "Raymarcher"
				(int "Iterations" raymarcher-iterations
					(min 1) (max 2048) (step .05))
				(float "Step size" raymarcher-step
					(min 0) (max 2) (slider))
				(float "Epsilon" raymarcher-epsilon
					(min 1e-10) (max 1) (power 1)
					(decimals 12) (step 1e-8))
				(float "Maximal distance" raymarcher-max-dist
					(min 1e-2) (max 1000000) (decimals 0)
					(step .05))
				(int "Correction steps" raymarcher-correction
					(min 0) (max 100) (slider))
			)
			(float "Fog" fog
				(min 0) (max 1) (step .000005) (decimals 5))
		)
	)
)

(fn scene-render ()
	(profiling "Scene render"
		(uniforms prg-scene-p1 1 $vp-width $vp-height)

		(uniforms prg-scene-p1 0 $time)
		(uniforms prg-scene-p1 2
			(get-input camera-pos-x)
			(get-input camera-pos-y)
			(get-input camera-pos-z)
		)
		(uniforms prg-scene-p1 3
			(get-input camera-lookat-x)
			(get-input camera-lookat-y)
			(get-input camera-lookat-z)
		)
		(uniforms prg-scene-p1 4
			(get-input camera-up-x)
			(get-input camera-up-y)
			(get-input camera-up-z)
		)
		(uniforms prg-scene-p1 5
			(get-input camera-nearplane)
		)
		(uniforms prg-scene-p1 6
			(get-input raymarcher-iterations)
			(get-input raymarcher-step)
			(get-input raymarcher-epsilon)
			(get-input raymarcher-max-dist)
		)
		(uniforms prg-scene-p1 7 (get-input fog))
		(uniforms-i prg-scene-p1 8 (get-input raymarcher-correction))
		(use-pipeline pl-scene-p1)
		(use-framebuffer rt-scene)
		(viewport 0 0 $vp-width $vp-height)
		(fullscreen)
	)
)

################################################################################
# Depth of Field

(fn dof-init ()
	# Sampler used for the inputs
	(sampler smp-dof
		(mipmaps no)
		(wrapping clamp-edge)
		(sampling linear)
		(lod 0 0)	
	)

	# Texture & RT for pass 1
	(texture tx-dof-pass1 rgb-f16 $vp-width $vp-height)
	(framebuffer rt-dof-pass1 tx-dof-pass1)

	# Texture & RT for pass 2
	(texture tx-dof-pass2 rgb-f16 $vp-width $vp-height)
	(framebuffer rt-dof-pass2 tx-dof-pass2)
	# TODO MAYBE ? (alias tx-dof-output tx-dof-pass2)

	# Output debugging
	(odbg tx-dof-pass1 hdr "DoF - First pass")
	(odbg tx-dof-pass2 hdr "DoF - Output")

	# Programs
	(program prg-dof-pass1 "dof-pass1.f.glsl")
	(program prg-dof-pass2 "dof-pass2.f.glsl")

	# Pipelines
	(pipeline pl-dof-pass1 prg-fullscreen prg-dof-pass1)
	(pipeline pl-dof-pass2 prg-fullscreen prg-dof-pass2)

	# Inputs
	(input dof-sharp-distance 0)
	(input dof-sharp-range 50)
	(input dof-falloff 50)
	(input dof-max-blur 16)
	(input dof-samples 16)

	# Input overrides
	(ui-overrides
		(section "Post-processing"
			(section "Depth of Field"
				(float "Sharp distance" dof-sharp-distance
					(min 0) (max 50000) (step .1))
				(float "Sharp range" dof-sharp-range
					(min 0) (max 50000) (step .1))
				(float "Falloff" dof-falloff
					(min 0) (max 50000) (step .1))
				(float "Maximum blur" dof-max-blur
					(min 1) (max 64) (slider))
				(int "Samples" dof-samples
					(min 1) (max 64) (slider))
			)
		)
	)
)

(fn dof-set-uniforms (prog)
	(uniforms prog 2
		(get-input dof-sharp-distance)
		(get-input dof-sharp-range)
		(get-input dof-falloff)
		(get-input dof-max-blur)
	)
	(uniforms prog 3 (get-input dof-samples))
	(uniforms prog 4 $vp-width $vp-height $time)
)

(fn dof-render (in-image in-depth)
	(profiling "Depth of Field"
		(use-texture 1 in-depth smp-dof)

		(uniforms-i prg-dof-pass1 0 0)
		(uniforms-i prg-dof-pass1 1 1)
		(uniforms-i prg-dof-pass2 0 0)
		(uniforms-i prg-dof-pass2 1 1)

		# First pass
		(call dof-set-uniforms prg-dof-pass1)
		(use-texture 0 in-image smp-dof)
		(use-pipeline pl-dof-pass1)
		(use-framebuffer rt-dof-pass1)
		(fullscreen)

		# Second pass
		(call dof-set-uniforms prg-dof-pass2)
		(use-texture 0 tx-dof-pass1 smp-dof)
		(use-pipeline pl-dof-pass2)
		(use-framebuffer rt-dof-pass2)
		(viewport 0 0 $vp-width $vp-height)
		(fullscreen)
	)
)


################################################################################
# Bloom

(fn bloom-init ()
	# Samplers
	(sampler smp-bloom-blur
		(sampling linear)
		(mipmaps linear)
		(lod 0 100)
		(wrapping clamp-edge)
	)
	(sampler smp-bloom-input
		(sampling nearest)
	)

	# First ping/pong texture & targets
	(texture tx-bloom1 rgb-f16 $vp-width $vp-height 6)
	(framebuffer rt-bloom1-lod0 (color tx-bloom1 0))
	(framebuffer rt-bloom1-lod1 (color tx-bloom1 1))
	(framebuffer rt-bloom1-lod2 (color tx-bloom1 2))
	(framebuffer rt-bloom1-lod3 (color tx-bloom1 3))
	(framebuffer rt-bloom1-lod4 (color tx-bloom1 4))
	(framebuffer rt-bloom1-lod5 (color tx-bloom1 5))
	(odbg tx-bloom1 hdr "Bloom")

	# Second ping/pong texture & targets
	(texture tx-bloom2 rgb-f16 $vp-width $vp-height 6)
	(framebuffer rt-bloom2-lod0 (color tx-bloom2 0))
	(framebuffer rt-bloom2-lod1 (color tx-bloom2 1))
	(framebuffer rt-bloom2-lod2 (color tx-bloom2 2))
	(framebuffer rt-bloom2-lod3 (color tx-bloom2 3))
	(framebuffer rt-bloom2-lod4 (color tx-bloom2 4))
	(framebuffer rt-bloom2-lod5 (color tx-bloom2 5))
	(odbg tx-bloom2 hdr "Bloom (partial)")

	# High pass program
	(program prg-bloom-highpass "bloom-highpass.f.glsl")
	(pipeline pl-bloom-highpass prg-fullscreen prg-bloom-highpass)

	# Downsampling program
	(program prg-bloom-downsample "downsample.f.glsl")
	(pipeline pl-bloom-downsample prg-fullscreen prg-bloom-downsample)

	# Blur pass
	(program prg-bloom-blur "blur-pass.f.glsl")
	(pipeline pl-bloom-blur prg-fullscreen prg-bloom-blur)

	# Inputs that control the high pass filter
	(input bloom-power 1.6)
	(input bloom-factor 1.2)
	(input bloom-output-factor 1.05)

	# Inputs that control the blur weights
	(input bloom-bw0 .324)
	(input bloom-bw1 .232)
	(input bloom-bw2 .0855)
	(input bloom-bw3 .0205)

	# Blur size
	(input bloom-blur-size 1.3)

	# Input overrides
	(ui-overrides
		(section "Post-processing"
			(section "Bloom"
				(section "Input filter"
					(float "Input power" bloom-power
						(min .5) (max 4) (slider))
					(float "Input factor" bloom-factor
						(min .5) (max 4) (slider))
					(float "Output factor" bloom-output-factor
						(min .5) (max 4) (slider))
				)
				(section "Blur"
					(float "Size" bloom-blur-size
						(min .5) (max 4) (slider))
					(float4 "Weights"
						bloom-bw0 bloom-bw1 bloom-bw2 bloom-bw3
						(min 0) (max 1) (step .00005))
				)
			)
		)
	)
)

(fn bloom-render (in-scene)
	(profiling "BLOOOOM!"
		(uniforms-i prg-bloom-highpass 0 0)
		(uniforms-i prg-bloom-highpass 1 0)
		(uniforms prg-bloom-highpass 2 $vp-width $vp-height)
		(uniforms-i prg-bloom-downsample 0 0)
		(uniforms-i prg-bloom-blur 0 0)

		# High pass
		(use-texture 0 in-scene smp-bloom-input)
		(uniforms prg-bloom-highpass 3
			(get-input bloom-power)
			(get-input bloom-factor)
			(get-input bloom-output-factor)
		)
		(use-framebuffer rt-bloom1-lod0)
		(use-pipeline pl-bloom-highpass)
		(viewport 0 0 $vp-width $vp-height)
		(fullscreen)

		# Set up blur weights
		(uniforms prg-bloom-blur 4
			(get-input bloom-bw0)
			(get-input bloom-bw1)
			(get-input bloom-bw2)
			(get-input bloom-bw3))

		# Blur & downsample
		(uniforms prg-bloom-blur 1 $vp-width $vp-height)
		(call bloom-blur-pass 0 rt-bloom1-lod0 rt-bloom2-lod0)
		(call bloom-downsample rt-bloom1-lod1 1)
		(call bloom-blur-pass 1 rt-bloom1-lod1 rt-bloom2-lod1)
		(call bloom-downsample rt-bloom1-lod2 2)
		(call bloom-blur-pass 2 rt-bloom1-lod2 rt-bloom2-lod2)
		(call bloom-downsample rt-bloom1-lod3 3)
		(call bloom-blur-pass 3 rt-bloom1-lod3 rt-bloom2-lod3)
		(call bloom-downsample rt-bloom1-lod4 4)
		(call bloom-blur-pass 4 rt-bloom1-lod4 rt-bloom2-lod4)
		(call bloom-downsample rt-bloom1-lod5 5)
		(call bloom-blur-pass 5 rt-bloom1-lod5 rt-bloom2-lod5)
	)
)

(fn bloom-downsample (target level)
	(locals m w h)
	(set m (inv (pow 2 $level)))
	(set w (mul $vp-width $m))
	(set h (mul $vp-height $m))

	(use-pipeline pl-bloom-downsample)
	(use-framebuffer target)
	(use-texture 0 tx-bloom1 smp-bloom-blur)
	(uniforms prg-bloom-downsample 1 $w $h)
	(uniforms-i prg-bloom-downsample 2 (sub $level 1))
	(viewport 0 0 $w $h)
	(fullscreen)

	(uniforms prg-bloom-blur 1 $w $h)
)

(fn bloom-blur-pass (lod fb1 fb2)
	# Common stuff for both passes
	(use-pipeline pl-bloom-blur)
	(uniforms-i prg-bloom-blur 2 $lod)

	# Pass 1
	(use-framebuffer fb2)
	(use-texture 0 tx-bloom1 smp-bloom-blur)
	(uniforms prg-bloom-blur 3
		(get-input bloom-blur-size) 0)
	(fullscreen)

	# Pass 2
	(use-framebuffer fb1)
	(use-texture 0 tx-bloom2 smp-bloom-blur)
	(uniforms prg-bloom-blur 3
		0 (get-input bloom-blur-size))
	(fullscreen)
)


################################################################################
# Combine

(fn combine-init ()
	# Assets
	(sampler smp-combine-input (sampling nearest))
	(sampler smp-combine-bloom
		(sampling linear)
		(mipmaps nearest)
		(lod 0 100))
	(texture tx-combined rgba-nu8 $vp-width $vp-height)
	(odbg tx-combined ldr-alpha "Combined output")
	(framebuffer rt-combined tx-combined)
	(program prg-combine "combine.f.glsl")
	(pipeline pl-combine prg-fullscreen prg-combine)

	# Bloom parameters
	(input bloom-strength .45)
	(input bloom-attenuation .3)

	# Vignette effect
	(input vignette-shape-m 1)
	(input vignette-shape-p 8)
	(input vignette-shape-r 1)
	(input vignette-aspect-ratio .5)
	(input vignette-apply-base 0)
	(input vignette-apply-max 1)

	# Color grading
	(input cg-lift-r 0)
	(input cg-lift-g 0)
	(input cg-lift-b 0)
	(input cg-gain-r 1)
	(input cg-gain-g 1)
	(input cg-gain-b 1)
	(input cg-gamma-r 0)
	(input cg-gamma-g 0)
	(input cg-gamma-b 0)

	# Input overrides
	(ui-overrides
		(section "Post-processing"
			(section "Bloom"
				(section "Output"
					(float "Strength" bloom-strength
						(min 0) (max 1) (slider))
					(float "Attenuation / level" bloom-attenuation
						(min 0) (max 1) (slider))
				)
			)

			(section "Color grading"
				(color-grading "Lift"
					cg-lift-r cg-lift-g cg-lift-b
					(base -.1) (unit .1))
				(color-grading "Gain"
					cg-gain-r cg-gain-g cg-gain-b
					(base 0) (unit 1))
				(color-grading "Gamma"
					cg-gamma-r cg-gamma-g cg-gamma-b
					(base -.9) (unit .9))
			)
		)
		# FIXME: overrides for vignette
	)
)

(fn combine-render (in-main in-bloom)
	(profiling "Combine"
		(uniforms-i prg-combine 0 0)
		(uniforms-i prg-combine 1 1)
		(uniforms prg-combine 2 $vp-width $vp-height)

		(use-pipeline pl-combine)
		(use-framebuffer rt-combined)
		(use-texture 0 in-main smp-combine-input)
		(use-texture 1 in-bloom smp-combine-bloom)
		(uniforms prg-combine 3
			(get-input bloom-strength)
			(get-input bloom-attenuation))
		(uniforms prg-combine 4
			(get-input vignette-shape-m)
			(get-input vignette-shape-p)
			(get-input vignette-aspect-ratio)
			(get-input vignette-shape-r))
		(uniforms prg-combine 5
			(get-input vignette-apply-base)
			(get-input vignette-apply-max))
		(uniforms prg-combine 6
			(get-input cg-lift-r)
			(get-input cg-lift-g)
			(get-input cg-lift-b))
		(uniforms prg-combine 7
			(get-input cg-gain-r)
			(get-input cg-gain-g)
			(get-input cg-gain-b))
		(uniforms prg-combine 8
			(get-input cg-gamma-r)
			(get-input cg-gamma-g)
			(get-input cg-gamma-b))
		(viewport 0 0 $vp-width $vp-height)
		(fullscreen)
	)
)


################################################################################
# FXAA

(fn fxaa-init ()
	(program prg-fxaa "fxaa.f.glsl")
	(pipeline pl-fxaa prg-fullscreen prg-fxaa)

	(sampler smp-fxaa
		(sampling linear)
		(wrapping clamp-border))

	(input fxaa-subpixel .5)
	(input fxaa-et .166)
	(input fxaa-et-min .0833)

	(ui-overrides
		(section "Post-processing"
			(section "FXAA"
				(float "Sub-pixel quality" fxaa-subpixel
					(min 0) (max 1) (slider))
				(float "Edge threshold" fxaa-et
					(min .063) (max .333) (slider))
				(float "Edge threshold min." fxaa-et-min
					(min .0312) (max .0833) (decimals 4)
					(slider))
			)
		)
	)
)

(fn fxaa-render (in-image)
	(profiling "FXAA"
		(uniforms-i prg-fxaa 0 0)
		(uniforms prg-fxaa 1
			$vp-x $vp-y $vp-width $vp-height)

		(main-output)
		(viewport 0 0 $width $height)
		(clear 0 0 0 0)

		(use-pipeline pl-fxaa)
		(use-texture 0 in-image smp-fxaa)
		(uniforms prg-fxaa 2
			(get-input fxaa-subpixel)
			(get-input fxaa-et)
			(get-input fxaa-et-min))
		(viewport $vp-x $vp-y $vp-width $vp-height)
		(fullscreen)
	)
)


# vim: syntax=demo-srd