shell of new raymarching lib
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814488620f
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7 changed files with 269 additions and 73 deletions
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@ -529,7 +529,7 @@ GameObject:
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m_Icon: {fileID: 0}
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m_NavMeshLayer: 0
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m_StaticEditorFlags: 0
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m_IsActive: 0
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m_IsActive: 1
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--- !u!65 &683266144
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BoxCollider:
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m_ObjectHideFlags: 0
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@ -63,8 +63,8 @@ Material:
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- _GlossMapScale: 1
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- _Glossiness: 0.5
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- _GlossyReflections: 1
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- _MaxDist: 256
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- _MaxSteps: 256
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- _MaxDist: 128
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- _MaxSteps: 128
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- _Metallic: 0
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- _Mode: 0
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- _OcclusionStrength: 1
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@ -1,61 +1,229 @@
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struct appdata
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{
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#ifndef LIBGARBAGE_INCLUDED
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#define LIBGARBAGE_INCLUDED
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#include "UnityCG.cginc"
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/*
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# defines with no defaults
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USE_WORLD_SPACE
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DISCARD_ON_MISS
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USE_MATERIALS_IN_RAYMARCH // TODO: implement, this is easier to work with but more expensive
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DISABLE_DEPTH
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START_RAYS_IN_BOX // TODO: implement
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START_RAYS_IN_SPHERE // TODO: implement
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*/
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// scene sdf with only distance
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#ifndef DISTANCE_FN
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#define DISTANCE_FN default_distance_sdf
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#endif
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// scene sdf that includes material data
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#ifndef MATERIAL_FN
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#define MATERIAL_FN default_material_sdf
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#endif
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// calculates a color from a Ray
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#ifndef LIGHT_FN
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#define LIGHT_FN default_lighting
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#endif
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// max ray steps, from last bounce (reset on each reflection)
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#ifndef MAX_STEPS
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#define MAX_STEPS 128
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#endif
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// max ray length, from last bounce (length is reset on each reflection)
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#ifndef MAX_DIST
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#define MAX_DIST 128
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#endif
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// the largest surface distance that is counted as a hit
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#ifndef SURF_DIST
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#define SURF_DIST 0.001
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#endif
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// TODO: implement
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#ifndef REFLECTIONS
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#define REFLECTIONS 0
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#endif
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// TODO: implement
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#ifndef SCENE_SCALE
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#define SCENE_SCALE 1
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#endif
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// TODO: implement
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#ifndef AMBIENT_OCCLUSION_STEPS
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#define AMBIENT_OCCLUSION_STEPS 4
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#endif
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struct AppData {
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float4 vertex : POSITION;
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};
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struct v2f
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{
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struct V2F {
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float4 vertex : SV_POSITION;
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float3 vCamPos : TEXCOORD1;
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float3 vHitPos : TEXCOORD2;
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float3 cam_pos : TEXCOORD0;
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float3 hit_pos : TEXCOORD1;
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};
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struct fragOut
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{
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fixed4 col : SV_Target;
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// float depth : SV_Depth;
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struct FragOut {
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fixed3 col : SV_Target;
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#ifndef DISABLE_DEPTH
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float depth : SV_Depth;
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#endif
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};
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v2f vert (appdata v)
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{
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v2f o;
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struct Material {
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float3 col;
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float gloss;
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};
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#define DEFAULT_MAT {float3(0.2, 0.2, 0.2), 0}
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struct SurfacePoint {
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float dist;
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Material mat;
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};
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//used for lighting a point
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struct Ray {
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float dist;
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int steps;
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Material mat;
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float3 start;
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float3 dir;
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float3 hit_pos;
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float3 normal;
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bool missed;
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float min_dist; // smallest distance encountered along the path (only useful for misses; shadow calculations)
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};
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#include "libgarbage_shapes.cginc"
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float DISTANCE_FN(float3 p);
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SurfacePoint MATERIAL_FN(float3 p);
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float3 LIGHT_FN(Ray ray);
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Ray cast_ray(float3 p, float3 d, float startDist = 0);
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V2F vert (AppData v) {
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V2F o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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#ifdef USE_WORLD_SPACE
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o.vCamPos = _WorldSpaceCameraPos;
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o.vHitPos = mul(unity_ObjectToWorld, v.vertex);
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o.cam_pos = _WorldSpaceCameraPos;
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o.hit_pos = mul(unity_ObjectToWorld, v.vertex);
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#else
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o.vCamPos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1));
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o.vHitPos = v.vertex;
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o.cam_pos = mul(unity_WorldToObject, float4(_WorldSpaceCameraPos, 1));
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o.hit_pos = v.vertex;
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#endif
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return o;
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}
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fragOut frag (v2f i)
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{
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fragOut o;
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o.col = 1;
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o.col.r = 0;
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FragOut frag (V2F i) {
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float ray_len = 0;
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float3 ray_dir = normalize(i.hit_pos - i.cam_pos);
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float3 last_bounce = i.cam_pos;
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SurfacePoint point_data;
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Ray ray;
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float3 col;
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float color_used = 0;// what amount of the final color has been calculated
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float prev_gloss = 0;
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float3 first_hit;
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for (int ray_num = 0; ray_num < REFLECTIONS + 1; ray_num++) {
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ray = cast_ray(last_bounce, ray_dir);
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if (ray_num == 0) { // before any bounces
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col = LIGHT_FN(ray);
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first_hit = ray.hit_pos;
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} else {
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float col_amount = color_used + ((1 - prev_gloss) * (1 - color_used));
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col = lerp(LIGHT_FN(ray), col, col_amount);
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color_used = col_amount;
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}
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if (ray.missed || ray.mat.gloss < 0.01) {
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break;
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}
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prev_gloss = ray.mat.gloss;
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ray_dir = reflect(ray_dir, ray.normal);
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last_bounce = ray.hit_pos + ray_dir * 0.01;
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}
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#ifdef DISCARD_ON_MISS
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if (ray.missed && ray_num == 0) discard;
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#endif
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FragOut o;
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o.col = col;
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#ifndef DISABLE_DEPTH
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float4 clip_pos = mul(UNITY_MATRIX_VP, mul(unity_ObjectToWorld, float4(first_hit, 1)));
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o.depth = clip_pos.z / clip_pos.w;
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#ifndef UNITY_REVERSED_Z // basically only OpenGL (unity editor on linux)
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o.depth = o.depth * 0.5 + 0.5; // remap -1 to 1 range to 0.0 to 1.0
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#endif
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#endif
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return o;
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}
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// #define SOME_MAGIC(main_fn) float3 main1()\
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// main_fn \
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inline float3 get_normal(float3 pos, float surface_distance, float epsilon = 0.001) {
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// if epsilon is smaller than 0.001, there are often artifacts
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const float2 e = float2(epsilon, 0);
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float3 n = surface_distance - float3(
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DISTANCE_FN(pos - e.xyy),
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DISTANCE_FN(pos - e.yxy),
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DISTANCE_FN(pos - e.yyx));
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return normalize(n);
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}
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#define SOME_MAGIC(PASS, function_definition) float3 main##PASS() function_definition
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Ray cast_ray(float3 start, float3 dir, float start_len) {
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float ray_len = start_len;
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#define DO_MAGIC MAIN_FN(1)
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Ray ray;
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ray.dir = dir;
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ray.start = start;
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ray.min_dist = 100100100; // budget "infinity"
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ray.missed = true;
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// #define SECOND_PASS 1
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// #define AA MAIN_FN
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// #define BB MAIN_FN
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for (int i = 0; i < MAX_STEPS; i++) {
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ray.hit_pos = start + ray_len * dir;
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ray.dist = DISTANCE_FN(ray.hit_pos);
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if (ray.dist < SURF_DIST) {
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ray.missed = false;
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break;
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}
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ray.min_dist = min(ray.min_dist, ray.dist);
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ray_len += ray.dist;
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if (ray_len > MAX_DIST) break;
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}
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ray.steps = i;
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if (ray.missed) {
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ray.normal = float3(0, 0, 0);
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} else {
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ray.normal = get_normal(ray.hit_pos, ray.dist);
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ray.mat = MATERIAL_FN(ray.hit_pos).mat;
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}
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return ray;
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}
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float default_distance_sdf(float3 p) {
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return sdSphere(p, 0.5);
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}
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SurfacePoint default_material_sdf(float3 p) {
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return mSphere(p, 0.5);
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}
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float3 default_lighting(Ray ray) {
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float3 sun_dir = normalize(float3(1, 0.5, 0));
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if (ray.missed)
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return 0.1;
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float3 col = 0;
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col = ray.mat.col * dot(ray.normal, sun_dir);
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return col;
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}
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// float3 main2() \
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// main_fn
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// \
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// float3 main2() \
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// main_fn\
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// #define SECOND_PASS \
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#endif // LIBGARBAGE_INCLUDED
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@ -1 +0,0 @@
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#define DO_MAGIC(p) MAIN_FN(p)
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@ -2,17 +2,16 @@ Shader "CrispyPin/LibGarbageExample"
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{
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Properties
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{
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[Header(Raymarcher Properties)]
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_MaxSteps ("Max steps", Int) = 256
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_MaxDist ("Max distance", Float) = 256
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_MaxSteps ("Max steps", Int) = 128
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_MaxDist ("Max distance", Float) = 128
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_SurfDist ("Surface distance threshold", Range(0.00001, 0.05)) = 0.001
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}
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SubShader
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{
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Tags { "RenderType"="Opaque" }
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Cull Off
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Cull Front
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LOD 100
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Pass
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@ -21,23 +20,13 @@ Shader "CrispyPin/LibGarbageExample"
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#pragma vertex vert
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#pragma fragment frag
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int _MaxSteps;
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#define MAX_STEPS _MaxSteps
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// #define DISABLE_DEPTH
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// #define DISCARD_ON_MISS
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#include "libgarbage.cginc"
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// #define MAIN_FN(PASS) float3 main##PASS ()\
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#define MAIN_FN(PASS) SOME_MAGIC(PASS,\
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{\
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return float3(1,0,0);\
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}\
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)
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// #include "libgarbage_end.cginc"
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// #define DO_MAGIC(p) MAIN_FN(p)
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DO_MAGIC
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// {return 0;}
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// MAIN_FN(1) {return 0;}
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ENDCG
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}
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}
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40
Assets/raymarched/lib/libgarbage_shapes.cginc
Normal file
40
Assets/raymarched/lib/libgarbage_shapes.cginc
Normal file
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@ -0,0 +1,40 @@
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#define _MAT_VARIANT1(NEW_NAME, BASE_FN, TYPE_1, ARG_1) \
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SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, Material mat = DEFAULT_MAT) {\
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SurfacePoint o;\
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o.dist = BASE_FN(p, ARG_1);\
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o.mat = mat;\
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return o;\
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}
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#define _MAT_VARIANT2(NEW_NAME, BASE_FN, TYPE_1, ARG_1, TYPE_2, ARG_2) \
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SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, TYPE_2 ARG_2, Material mat = DEFAULT_MAT) {\
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SurfacePoint o;\
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o.dist = BASE_FN(p, ARG_1, ARG_2);\
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o.mat = mat;\
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return o;\
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}
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#define _MAT_VARIANT3(NEW_NAME, BASE_FN, TYPE_1, ARG_1, TYPE_2, ARG_2, TYPE_3, ARG_3) \
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SurfacePoint NEW_NAME(float3 p, TYPE_1 ARG_1, TYPE_2 ARG_2, TYPE_3 ARG_3, Material mat = DEFAULT_MAT) {\
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SurfacePoint o;\
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o.dist = BASE_FN(p, ARG_1, ARG_2, ARG_3);\
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o.mat = mat;\
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return o;\
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}
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//
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// Most of these are taken from https://iquilezles.org/articles/distfunctions/
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// Thank you Inigo Quilez <3
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float sdBox(float3 p, float3 size) {
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float3 q = abs(p) - size / 2.0;
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return length(max(q, 0)) + min(max(q.x, max(q.y, q.z)), 0);
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}
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_MAT_VARIANT1(mBox, sdBox, float3, size)
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float sdSphere(float3 p, float radius) {
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return length(p) - radius;
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}
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_MAT_VARIANT1(mSphere, sdSphere, float, radius)
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@ -1,5 +1,5 @@
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fileFormatVersion: 2
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guid: 26203816190e7e521a12959d895d68a3
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guid: 4d08637fa3f7e141190ffd1bdbca2c19
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ShaderImporter:
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externalObjects: {}
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defaultTextures: []
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