Test - Compute shaders for raymarching

test/demo.srd

@@ -18,6 +18,12 @@
 	(program prg-fullscreen "fullscreen.v.glsl")
 
 	(set use-compute 1)
+
+	(set render-compute-size-x 8)
+	(set render-compute-size-y 8)
+	(set combine-compute-size-x 8)
+	(set combine-compute-size-y 32)
+
 	(call scene-init)
 	(call dof-init)
 	(call bloom-init)
@@ -40,14 +46,22 @@
 # 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))
+	(if $use-compute (
+		(texture tx-scene-output rgba-f16 $vp-width $vp-height)
 
-	(program prg-scene-p1 "scene.f.glsl")
-	(pipeline pl-scene-p1 prg-fullscreen prg-scene-p1)
+		(program prg-scene-p1 "scene.c.glsl")
+		(pipeline pl-scene-p1 prg-scene-p1)
+	)(
+		(texture tx-scene-output rgb-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")
@@ -100,8 +114,6 @@
 
 (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)
@@ -130,9 +142,18 @@
 		(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)
+		(if $use-compute (
+			(image 0 tx-scene-output 0)
+			(compute
+				(add 1 (div $vp-width $render-compute-size-x))
+				(add 1 (div $vp-height $render-compute-size-y))
+				1)
+		)(
+			(uniforms prg-scene-p1 1 $vp-width $vp-height)
+			(use-framebuffer rt-scene)
+			(viewport 0 0 $vp-width $vp-height)
+			(fullscreen)
+		))
 	)
 )
 
@@ -414,8 +435,6 @@
 	(if $use-compute (
 		(program prg-combine "combine.c.glsl")
 		(pipeline pl-combine prg-combine)
-		(set combine-compute-size-x 8)
-		(set combine-compute-size-y 32)
 	)(
 		(framebuffer rt-combined tx-combined)
 		(program prg-combine "combine.f.glsl")

test/shaders/chunks/raymarcher-cs.glsl

@@ -0,0 +1,22 @@
+//! type chunk
+
+layout(
+	local_size_x = 8 ,
+	local_size_y = 8
+) in;
+
+layout( location = 0 ) uniform float u_Time;
+//layout( location = 1 ) uniform vec2 u_Resolution;
+layout( location = 2 ) uniform vec3 u_CamPos;
+layout( location = 3 ) uniform vec3 u_LookAt;
+layout( location = 4 ) uniform vec3 u_CamUp;
+layout( location = 5 ) uniform float u_NearPlane;
+layout( location = 6 ) uniform vec4 u_Render;
+layout( location = 7 ) uniform float u_FogAttenuation;
+layout( location = 8 ) uniform int u_Correction;
+
+//layout( location = 0 ) out vec3 o_Color;
+//layout( location = 1 ) out float o_Z;
+layout( binding = 0 , rgba16f ) writeonly uniform image2D u_Output;
+
+//! include lib/raymarching.glsl

test/shaders/scene.c.glsl

@@ -0,0 +1,177 @@
+#version 450 core
+//! type compute
+
+//! include chunks/raymarcher-cs.glsl
+//! include lib/hg_sdf.glsl
+
+//! include lib/shading-pbr.glsl
+//! include lib/shading-blinnphong.glsl
+//! include lib/fog.glsl
+
+
+T_BPMaterial BPMaterials[1] = {
+	{ vec3( .95 , .8 , 1 ) * .2 , vec3( 10 ) , 800 , 0 }
+};
+
+T_PBRMaterial PBRMaterials[1] = {
+	{
+		// Albedo color
+		vec3( .9 , 1 , .9 ) ,
+		// Roughness , metallic , subsurface , anisotropy
+		.15 , .5 , .9 , .9 ,
+		// Specular strength / tint%
+		.5 , .5
+	}
+};
+
+vec3 Glow[1] = {
+	vec3( .95 , .8 , 1 ) * 5
+};
+
+void mapMaterial(
+	in int matIndex ,
+	out int type ,
+	out int tIndex ,
+	out int glowIndex )
+{
+	if ( matIndex == 0 ) {
+		type = 1;
+		glowIndex = -1;
+	} else {
+		type = 0;
+		glowIndex = 0;
+	}
+	tIndex = 0;
+}
+
+vec2 RM_Map( vec3 pos )
+{
+	vec3 q = pos;
+	HG_pMod2( q.xy , vec2( 8. ) );
+	HG_pR( q.xz , 1 );
+	return vec2( HG_fOpUnionStairs(
+			HG_fBox( q , vec3( 2.3 ) ) ,
+			HG_fSphere( q , 2.6 ) ,
+			1. , 4 ) ,
+		step( 0. , -HG_fSphere( pos , 3 ) ) );
+}
+
+
+vec3 pointlight(
+	in T_PBRMaterial material ,
+	in T_PBRPrecomputed pre ,
+	in vec3 hitPos ,
+	in vec3 rayDir ,
+	in vec3 normal ,
+	in vec3 lightPos ,
+	in vec3 lightColor ,
+	in float lightIntensity )
+{
+	vec3 lightRay = lightPos - hitPos;
+	float lPwr =  lightIntensity / max( .001 , dot( lightRay , lightRay ) );
+	if ( lPwr < .00005 ) {
+		return vec3( 0 );
+	}
+
+	return lightColor * lPwr * PBR_Shade( material , pre ,
+			-rayDir , normal , normalize( lightRay ) );
+}
+
+
+vec3 pointlight(
+	in T_BPMaterial material ,
+	in vec3 hitPos ,
+	in vec3 rayDir ,
+	in vec3 normal ,
+	in vec3 lightPos ,
+	in vec3 lightColor ,
+	in float lightIntensity )
+{
+	vec3 lightRay = lightPos - hitPos;
+	float lPwr =  lightIntensity / max( .1 , dot( lightRay , lightRay ) );
+	if ( lPwr < .00005 ) {
+		return vec3( 0 );
+	}
+
+	return lightColor * lPwr * BP_Shade(
+			material , -rayDir , normal , lightRay );
+}
+
+
+void main( )
+{
+	vec2 res = imageSize( u_Output );
+	ivec2 coords = ivec2( gl_GlobalInvocationID.xy );
+	vec2 uv = ( vec2( coords ) / res ) * 2 - 1;
+	vec3 camDir = normalize( u_LookAt - u_CamPos );
+	vec3 side = normalize( cross( u_CamUp , camDir ) );
+	vec3 up = normalize( cross( camDir , side ) );
+	vec3 rayDir = normalize( camDir * u_NearPlane
+			+ uv.x * side * res.x / res.y
+			+ uv.y * up );
+
+	float tanPhi = RM_TanPhi( uv , u_Render.z );
+
+	vec3 r = RM_Advanced( u_CamPos , rayDir ,
+			int( u_Render.x ) , u_Render.y ,
+			tanPhi , .01 , u_Render.w );
+	const vec3 background = vec3( .005 );
+
+	vec3 bc = background;
+	vec4 outValue;
+	if ( r.y >= 0. ) {
+		const vec3 hitPos = RM_ReduceDiscontinuity(
+				u_CamPos , rayDir , r.x ,
+				tanPhi , u_Correction );
+		const vec3 normal = RM_GetNormal( hitPos );
+
+		const int midx = int( r.y );
+		const vec3 sunlightDir = normalize( vec3( 0 , 1 , 1 ) );
+		const vec3 sunlightColor = vec3( 1 , 1 , .99 ) * .05;
+		const vec3 pl1Pos = vec3( 3 , 3 , 5 );
+		const vec3 pl1Color = vec3( 1 , .7 , .8 );
+		const float pl1Power = 20;
+		const vec3 pl2Pos = vec3( -3 , -3 , 5 );
+		const vec3 pl2Color = vec3( .6 , 1 , .8 );
+		const float pl2Power = 20;
+
+		// Remap materials through mapMaterials
+		int mtype , mtidx , glowidx;
+		mapMaterial( midx , mtype , mtidx , glowidx );
+		if ( mtype == 0 ) {
+			T_BPMaterial mat = BPMaterials[ mtidx ];
+			bc = sunlightColor * BP_Shade( mat ,
+					-rayDir , normal , sunlightDir );
+			bc += pointlight( mat ,
+					hitPos , rayDir , normal ,
+					pl1Pos , pl1Color , pl1Power );
+			bc += pointlight( mat ,
+					hitPos , rayDir , normal ,
+					pl2Pos , pl2Color , pl2Power );
+		} else {
+			T_PBRMaterial mat = PBRMaterials[ mtidx ];
+			T_PBRPrecomputed pre = PBR_Precompute(
+					mat , -rayDir , normal );
+			bc = sunlightColor * PBR_Shade( mat , pre ,
+					-rayDir , normal , sunlightDir );
+			bc += pointlight( mat , pre ,
+					hitPos , rayDir , normal ,
+					pl1Pos , pl1Color , pl1Power );
+			bc += pointlight( mat , pre ,
+					hitPos , rayDir , normal ,
+					pl2Pos , pl2Color , pl2Power );
+		}
+
+		if ( glowidx >= 0 ) {
+			bc += Glow[ glowidx ];
+		}
+		bc = FOG_Apply( bc , length( u_CamPos - hitPos ) ,
+				u_FogAttenuation , background );
+		outValue.w = r.x;
+	} else {
+		outValue.w = u_Render.w;
+	}
+
+	outValue.xyz = bc;
+	imageStore( u_Output , coords , outValue );
+}