From 9e583c13740f94e3a64ac46c036933bc3c7c963f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emmanuel=20Beno=C3=AEt?= <tseeker@nocternity.net>
Date: Fri, 10 Nov 2017 18:28:56 +0100
Subject: [PATCH] Ported bloom to script

Breaks the parser because we don't support LODs for textures and
framebuffers. Also we need a command for local variables.
---
 demo.srd | 163 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 162 insertions(+), 1 deletion(-)

diff --git a/demo.srd b/demo.srd
index 334adec..5a5d4c7 100644
--- a/demo.srd
+++ b/demo.srd
@@ -18,12 +18,14 @@
 
 	(call scene-init)
 	(call dof-init)
+	(call bloom-init)
 )
 
 (frame
 	(profiling "Frame render"
 		(call scene-main)
 		(call dof-main tx-scene-output tx-scene-depth)
+		(call bloom-main tx-scene-output)
 	)
 )
 
@@ -44,6 +46,25 @@
 
 	(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 -5)
+	(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)
 )
 
 (fn scene-main ()
@@ -67,7 +88,14 @@
 		(uniforms prg-scene-p1 5
 			(get-input camera-nearplane)
 		)
-		# FIXME MOAR UNIFORMS!
+		(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 prg-scene-p1 8 (get-input raymarcher-correction))
 		(use-pipeline pl-scene-p1)
 		(use-framebuffer rt-scene)
 		(viewport 0 0 $vp-width $vp-height)
@@ -163,4 +191,137 @@
 	)
 )
 
+
+################################################################################
+# Bloom
+
+(fn bloom-init ()
+	# Samplers
+	(sampler smp-bloom-blur
+		(sampling linear)
+		(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))
+
+	# High pass program
+	(program prg-bloom-highpass "bloom-highpass.f.glsl")
+	(pipeline pl-bloom-highpass prg-fullscreen prg-bloom-highpass)
+	(uniforms-i prg-bloom-highpass 0 0)
+	(uniforms-i prg-bloom-highpass 1 0)
+	(uniforms prg-bloom-highpass 2 $vp-width $vp-height)
+
+	# Downsampling program
+	(program prg-bloom-downsample "downsample.f.glsl")
+	(pipeline pl-bloom-downsample prg-fullscreen prg-bloom-downsample)
+	(uniforms-i prg-bloom-downsample 0 0)
+
+	# Blur pass
+	(program prg-bloom-blur "blur-pass.f.glsl")
+	(pipeline pl-bloom-blur prg-fullscreen prg-bloom-blur)
+	(uniforms-i prg-bloom-blur 0 0)
+
+	# Inputs that control the high pass filter
+	# FIXME I don't remember what they actually do, rename them later
+	(input bloom-filter0 1.6)
+	(input bloom-filter1 1.2)
+	(input bloom-filter2 .95)
+
+	# 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)
+)
+
+(fn bloom-main (in-scene)
+	(profiling "BLOOOOM!"
+		# High pass
+		(use-texture 0 in-scene smp-bloom-input)
+		(uniforms prg-bloom-highpass 3
+			(get-input bloom-filter0)
+			(get-input bloom-filter1)
+			(get-input bloom-filter2)
+		)
+		(use-framebuffer rt-bloom1-lod0)
+		(viewport 0 0 $vp-width $vp-height)
+		(fullscreen)
+
+		# Blur & downsample
+		(uniforms prg-bloom-downsample 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 w h)
+	(set w (div $vp-width (pow 2 $level)))
+	(set h (div $vp-height (pow 2 $level)))
+
+	(use-pipeline pl-bloom-downsample)
+	(use-framebuffer target)
+	(use-texture 0 tx-bloom1 smp-bloom-blur)
+	(uniforms prg-bloom-downsample 1 $w $h)
+	(uniforms 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 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)
+)
+
+
+
 # vim: syntax=demo-srd