shell of new raymarching lib

Assets/raymarched/Raymarching.unity

@@ -529,7 +529,7 @@ GameObject:
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
   m_StaticEditorFlags: 0
-  m_IsActive: 0
+  m_IsActive: 1
 --- !u!65 &683266144
 BoxCollider:
   m_ObjectHideFlags: 0

Assets/raymarched/lib/GarbageExample.mat

@@ -63,8 +63,8 @@ Material:
     - _GlossMapScale: 1
     - _Glossiness: 0.5
     - _GlossyReflections: 1
-    - _MaxDist: 256
-    - _MaxSteps: 256
+    - _MaxDist: 128
+    - _MaxSteps: 128
     - _Metallic: 0
     - _Mode: 0
     - _OcclusionStrength: 1

Assets/raymarched/lib/libgarbage.cginc

@@ -1,61 +1,229 @@
-struct appdata
-{
+#ifndef LIBGARBAGE_INCLUDED
+#define LIBGARBAGE_INCLUDED
+#include "UnityCG.cginc"
+
+/*
+# defines with no defaults
+USE_WORLD_SPACE
+DISCARD_ON_MISS
+USE_MATERIALS_IN_RAYMARCH // TODO: implement, this is easier to work with but more expensive
+DISABLE_DEPTH
+START_RAYS_IN_BOX // TODO: implement
+START_RAYS_IN_SPHERE // TODO: implement
+*/
+
+// scene sdf with only distance
+#ifndef DISTANCE_FN
+#define DISTANCE_FN default_distance_sdf
+#endif
+
+// scene sdf that includes material data
+#ifndef MATERIAL_FN
+#define MATERIAL_FN default_material_sdf
+#endif
+
+// calculates a color from a Ray
+#ifndef LIGHT_FN
+#define LIGHT_FN default_lighting
+#endif
+
+// max ray steps, from last bounce (reset on each reflection)
+#ifndef MAX_STEPS
+#define MAX_STEPS 128
+#endif
+
+// max ray length, from last bounce (length is reset on each reflection)
+#ifndef MAX_DIST
+#define MAX_DIST 128
+#endif
+
+// the largest surface distance that is counted as a hit
+#ifndef SURF_DIST
+#define SURF_DIST 0.001
+#endif
+
+// TODO: implement
+#ifndef REFLECTIONS
+#define REFLECTIONS 0
+#endif
+
+// TODO: implement
+#ifndef SCENE_SCALE
+#define SCENE_SCALE 1
+#endif
+
+// TODO: implement
+#ifndef AMBIENT_OCCLUSION_STEPS
+#define AMBIENT_OCCLUSION_STEPS 4
+#endif
+
+
+struct AppData {
 	float4 vertex : POSITION;
 };
 
-struct v2f
-{
+struct V2F {
 	float4 vertex : SV_POSITION;
-    float3 vCamPos : TEXCOORD1;
-    float3 vHitPos : TEXCOORD2;
+	float3 cam_pos : TEXCOORD0;
+	float3 hit_pos : TEXCOORD1;
 };
 
-struct fragOut
-{
-    fixed4 col : SV_Target;
-    // float depth : SV_Depth;
-};
-
-v2f vert (appdata v)
-{
-    v2f o;
-    o.vertex = UnityObjectToClipPos(v.vertex);
-#ifdef USE_WORLD_SPACE
-    o.vCamPos = _WorldSpaceCameraPos;
-    o.vHitPos = mul(unity_ObjectToWorld, v.vertex);
-#else
-    o.vCamPos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1));
-    o.vHitPos = v.vertex;
+struct FragOut {
+	fixed3 col : SV_Target;
+#ifndef DISABLE_DEPTH
+	float depth : SV_Depth;
 #endif
+};
+
+struct Material {
+	float3 col;
+	float gloss;
+};
+#define DEFAULT_MAT {float3(0.2, 0.2, 0.2), 0}
+
+struct SurfacePoint {
+	float dist;
+	Material mat;
+};
+
+//used for lighting a point
+struct Ray {
+	float dist;
+	int steps;
+	Material mat;
+	float3 start;
+	float3 dir;
+	float3 hit_pos;
+	float3 normal;
+	bool missed;
+	float min_dist; // smallest distance encountered along the path (only useful for misses; shadow calculations)
+};
+
+#include "libgarbage_shapes.cginc"
+
+float DISTANCE_FN(float3 p);
+SurfacePoint MATERIAL_FN(float3 p);
+float3 LIGHT_FN(Ray ray);
+Ray cast_ray(float3 p, float3 d, float startDist = 0);
+
+V2F vert (AppData v) {
+	V2F o;
+	o.vertex = UnityObjectToClipPos(v.vertex);
+	#ifdef USE_WORLD_SPACE
+	o.cam_pos = _WorldSpaceCameraPos;
+	o.hit_pos = mul(unity_ObjectToWorld, v.vertex);
+	#else
+	o.cam_pos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1));
+	o.hit_pos = v.vertex;
+	#endif
 	return o;
 }
 
-fragOut frag (v2f i)
-{
-	fragOut o;
-	o.col = 1;
-	o.col.r = 0;
+FragOut frag (V2F i) {
+	float ray_len = 0;
+	float3 ray_dir = normalize(i.hit_pos - i.cam_pos);
+
+	float3 last_bounce = i.cam_pos;
+	SurfacePoint point_data;
+	Ray ray;
+
+	float3 col;
+	float color_used = 0;// what amount of the final color has been calculated
+	float prev_gloss = 0;
+	float3 first_hit;
+
+	for (int ray_num = 0; ray_num < REFLECTIONS + 1; ray_num++) {
+		ray = cast_ray(last_bounce, ray_dir);
+		if (ray_num == 0) { // before any bounces
+			col = LIGHT_FN(ray);
+			first_hit = ray.hit_pos;
+		} else {
+			float col_amount = color_used + ((1 - prev_gloss) * (1 - color_used));
+			col = lerp(LIGHT_FN(ray), col, col_amount);
+			color_used = col_amount;
+		}
+		if (ray.missed || ray.mat.gloss < 0.01) {
+			break;
+		}
+		prev_gloss = ray.mat.gloss;
+		ray_dir = reflect(ray_dir, ray.normal);
+		last_bounce = ray.hit_pos + ray_dir * 0.01;
+	}
+
+	#ifdef DISCARD_ON_MISS
+	if (ray.missed && ray_num == 0) discard;
+	#endif
+
+	FragOut o;
+	o.col = col;
+
+	#ifndef DISABLE_DEPTH
+		float4 clip_pos = mul(UNITY_MATRIX_VP, mul(unity_ObjectToWorld, float4(first_hit, 1)));
+		o.depth = clip_pos.z / clip_pos.w;
+		#ifndef UNITY_REVERSED_Z // basically only OpenGL (unity editor on linux)
+			o.depth = o.depth * 0.5 + 0.5; // remap -1 to 1 range to 0.0 to 1.0
+		#endif
+	#endif
 	return o;
 }
 
-// #define SOME_MAGIC(main_fn) float3 main1()\
-// main_fn \
+inline float3 get_normal(float3 pos, float surface_distance, float epsilon = 0.001) {
+	// if epsilon is smaller than 0.001, there are often artifacts
+	const float2 e = float2(epsilon, 0);
+	float3 n = surface_distance - float3(
+			DISTANCE_FN(pos - e.xyy),
+			DISTANCE_FN(pos - e.yxy),
+			DISTANCE_FN(pos - e.yyx));
+	return normalize(n);
+}
 
-#define SOME_MAGIC(PASS, function_definition) float3 main##PASS() function_definition
+Ray cast_ray(float3 start, float3 dir, float start_len) {
+	float ray_len = start_len;
 
-#define DO_MAGIC MAIN_FN(1)
+	Ray ray;
+	ray.dir = dir;
+	ray.start = start;
+	ray.min_dist = 100100100; // budget "infinity"
+	ray.missed = true;
 
-// #define SECOND_PASS 1
-// #define AA MAIN_FN
-// #define BB MAIN_FN
+	for (int i = 0; i < MAX_STEPS; i++) {
+		ray.hit_pos = start + ray_len * dir;
+		ray.dist = DISTANCE_FN(ray.hit_pos);
+		if (ray.dist < SURF_DIST) {
+			ray.missed = false;
+			break;
+		}
+		ray.min_dist = min(ray.min_dist, ray.dist);
+		ray_len += ray.dist;
+		if (ray_len > MAX_DIST) break;
+	}
+
+	ray.steps = i;
+	if (ray.missed) {
+		ray.normal = float3(0, 0, 0);
+	} else {
+		ray.normal = get_normal(ray.hit_pos, ray.dist);
+		ray.mat = MATERIAL_FN(ray.hit_pos).mat;
+	}
+	return ray;
+}
+
+float default_distance_sdf(float3 p) {
+	return sdSphere(p, 0.5);
+}
+
+SurfacePoint default_material_sdf(float3 p) {
+	return mSphere(p, 0.5);
+}
+
+float3 default_lighting(Ray ray) {
+	float3 sun_dir = normalize(float3(1, 0.5, 0));
+	if (ray.missed)
+		return 0.1;
+	float3 col = 0;
+	col = ray.mat.col * dot(ray.normal, sun_dir);
+	return col;
+}
 
 
-// float3 main2() \
-// main_fn
-
-// \
-// float3 main2() \
-// main_fn\
-
-
-// #define SECOND_PASS \
+#endif // LIBGARBAGE_INCLUDED

Assets/raymarched/lib/libgarbage_end.cginc

@@ -1 +0,0 @@
-#define DO_MAGIC(p) MAIN_FN(p)

Assets/raymarched/lib/libgarbage_example.shader

@@ -2,17 +2,16 @@ Shader "CrispyPin/LibGarbageExample"
 {
 	Properties
 	{
-
 		[Header(Raymarcher Properties)]
-		_MaxSteps ("Max steps", Int) = 256
-		_MaxDist ("Max distance", Float) = 256
+		_MaxSteps ("Max steps", Int) = 128
+		_MaxDist ("Max distance", Float) = 128
 		_SurfDist ("Surface distance threshold", Range(0.00001, 0.05)) = 0.001
 
 	}
 	SubShader
 	{
 		Tags { "RenderType"="Opaque" }
-		Cull Off
+		Cull Front
 		LOD 100
 
 		Pass
@@ -21,23 +20,13 @@ Shader "CrispyPin/LibGarbageExample"
 			#pragma vertex vert
 			#pragma fragment frag
 
+			int _MaxSteps;
+			#define MAX_STEPS _MaxSteps
+
+			// #define DISABLE_DEPTH
+			// #define DISCARD_ON_MISS
 			#include "libgarbage.cginc"
 
-			// #define MAIN_FN(PASS) float3 main##PASS ()\
-
-			#define MAIN_FN(PASS) SOME_MAGIC(PASS,\
-			{\
-				return float3(1,0,0);\
-			}\
-			)
-			// #include "libgarbage_end.cginc"
-			// #define DO_MAGIC(p) MAIN_FN(p)
-			DO_MAGIC
-
-			// {return 0;}
-			// MAIN_FN(1) {return 0;}
-
-
 			ENDCG
 		}
 	}

Assets/raymarched/lib/libgarbage_shapes.cginc

@@ -0,0 +1,40 @@
+
+#define _MAT_VARIANT1(NEW_NAME, BASE_FN, TYPE_1, ARG_1) \
+	SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, Material mat = DEFAULT_MAT) {\
+		SurfacePoint o;\
+		o.dist = BASE_FN(p, ARG_1);\
+		o.mat = mat;\
+		return o;\
+	}
+
+#define _MAT_VARIANT2(NEW_NAME, BASE_FN, TYPE_1, ARG_1, TYPE_2, ARG_2) \
+	SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, TYPE_2 ARG_2, Material mat = DEFAULT_MAT) {\
+		SurfacePoint o;\
+		o.dist = BASE_FN(p, ARG_1, ARG_2);\
+		o.mat = mat;\
+		return o;\
+	}
+
+#define _MAT_VARIANT3(NEW_NAME, BASE_FN, TYPE_1, ARG_1, TYPE_2, ARG_2, TYPE_3, ARG_3) \
+	SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, TYPE_2 ARG_2, TYPE_3 ARG_3, Material mat = DEFAULT_MAT) {\
+		SurfacePoint o;\
+		o.dist = BASE_FN(p, ARG_1, ARG_2, ARG_3);\
+		o.mat = mat;\
+		return o;\
+	}
+
+//
+// Most of these are taken from https://iquilezles.org/articles/distfunctions/
+// Thank you Inigo Quilez <3
+
+float sdBox(float3 p, float3 size) {
+	float3 q = abs(p) - size / 2.0;
+	return length(max(q, 0)) + min(max(q.x, max(q.y, q.z)), 0);
+}
+_MAT_VARIANT1(mBox, sdBox, float3, size)
+
+float sdSphere(float3 p, float radius) {
+	return length(p) - radius;
+}
+_MAT_VARIANT1(mSphere, sdSphere, float, radius)
+

Assets/raymarched/lib/libgarbage_shapes.cginc.meta

@@ -1,5 +1,5 @@
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+guid: 4d08637fa3f7e141190ffd1bdbca2c19
 ShaderImporter:
   externalObjects: {}
   defaultTextures: []