[2016 GDC] Multiplatform GPU Ray-Tracing Solutions With FireRender and FireRays

1" MARCH"2016"""|"""FIRERENDER,"FIRERAYS"
TAKAHIRO"HARADA,"DMITRY"KOZLOV"
3/16/2016"
MULTIPLATFORM+GPU+RAY.TRACING+SOLUTIONS+
WITH+FIRERENDER+AND+FIRERAYS+

MARCH"2016"""|"""FIRERENDER,"FIRERAYS"
!  FireRender"
‒ All"in"package"(ray"casKng,"shading)"
‒ For"renderer"users"
‒ Output"Q"Rendered"image"
‒ Physically"based"rendering"library"
!  FireRays"
‒ For"renderer"developers"
‒ Output"Q"IntersecKons"
‒ Ray"intersecKon"library"
!  Implemented"using"OpenCL"
MULTIPLATFORM"GPU"RAYQTRACING"SOLUTIONS"

!  FireRender"
‒ Features"
‒ Architecture"
‒ Examples"
!  FireRays"
‒ IntroducKon"
‒ Technology"
‒ Examples"
AGENDA"

FIRERENDER+

!  “Fast"high"quality"rendering"everywhere”"
""""""""GPU""""""""Path"tracing"""""""""""""OpenCL"
!  C"API"
!  OpenCL"1.2"
!  MulK"pla`orm"soluKon"
‒ OS"(Windows,"Linux)"
‒ Vendor"(AMD,…)"
FIRERENDER"

FEATURES"
! Camera"
MoKon"Blur"DOF" Bokeh"
! Geometry"
Instancing"Mesh" Subdivision"
! Lights"
Area"IES"Spot"Point"

FEATURES"
MATERIALS"
! BSDFs"
! Basic"components"
Diffuse"reflecKon"
! Shader"graph"
! Arbitrary"connecKon"of"shader"nodes"for"flexible"shading"system"
Diffuse"refracKon" Glossy"reflecKon" Glossy"refracKon" Spec."reflecKon" Spec."refracKon" SSS"
Input"Lookup" ArithmeKc" Example" Example" Example"Procedural" Blend"BSDFs""

HOW"FIRERENDER"IS"BUILT"
FIRERENDER+ARCHITECTURE+

ARCHITECTURE"OVERVIEW"
!  Input:"scene"info"
!  Output:"rendered"image"
!  Runs"on""
‒ Single"GPU"
‒ MulKple"GPUs"
‒ CPUs"
‒ Mix"of"these"
CPU+
OpenCL+
FireRender+Core+
User+
Geometry,"material,"light" Rendered"image"
FireRender+API+
GPU+#2+GPU+#1+

FIRERENDER+CORE+

!  Split"kernel"implementaKon"
‒ Modular"
‒ Easy"to"modify,"extend,"debug"
‒ Change"behavior"by"replacing"a"kernel"
‒  Ray"casKng"kernel"=>"FireRays,"Vector"displacement,"Out"of"core"support"
‒  Camera"=>"Bake"camera"
‒ High"GPU"uKlizaKon"
‒ Less"GPR"usage"
‒ Bener"performance"
IMPLEMENTATION"

!  Textures"
‒ Manually"managed"
‒ No"limit"to"the"number"of"textures"(up"to"the"memory"limit)"
!  Lights"
‒ Many"lights"are"challenging"
‒ Slow"convergence"
‒ OpKmized"for"many"lights"
‒ GPU"opKmized"stochasKc"light"culling"
IMPLEMENTATION"
6,000"area"lights"

IMPLEMENTATION"
MATERIAL"SYSTEM"
!  Material"=="shader"graph"
‒ Arbitrary"node"connecKon"
‒ BSDFs"(Closures),"textures,"arithmeKc"operaKon"
!  For"each"shading"point"
‒ Traverse"the"graph"
=>"BSDF"+"Parameters"
‒ Evaluate"BSDF"
‒ Sample"using"BSDF"

!  Make"single"frame"render"faster"
!  Screen"split"
!  Support"heterogeneous"GPUs"
!  Load"balancing"
‒ Minimize"the"idle"Kme"on"GPU"
IMPLEMENTATION"
MULTI"GPU"SUPPORT"
7"GPUs"

HOW"TO"USE"FIRERENDER"
FIRERENDER+API+

Initialization
FIRERENDER"API"EXAMPLE"(1/4)"
SIMPLE"RENDER"
Camera Set up
// Create OpenCL context using a single GPU
fr_context context;
fr_material_system matsys;
fr_scene scene;
frCreateContext(FR_API_VERSION, FR_CONTEXT_OPENCL, FR_CREATION_FLAGS_ENABLE_GPU0, NULL, NULL, &context);
frContextCreateMaterialSystem(context, 0, &matsys);
frContextCreateScene(context, &scene);
frContextSetScene(context, scene);
// Create camera
fr_camera camera;
frContextCreateCamera(context, &camera);
frCameraLookAt(camera, 5, 5, 20, 0, 0, 0, 0, 1, 0);
frCameraSetFocalLength(camera, 75.f);
frSceneSetCamera(scene, camera);

// Create point light
fr_light light;
frContextCreatePointLight(context, &light);
frLightSetTransform(light, FR_TRUE, &lightm(0,0));
frPointLightSetRadiantPower3f(light, 255, 241, 224);
frSceneAttachLight(scene, light);
// Create plane mesh
fr_shape plane;
frContextCreateMesh(context,...);
frSceneAttachShape(scene, plane);
// Create simple diffuse shader
fr_material_node diffuse;
frMaterialSystemCreateNode(matsys, FR_MATERIAL_NODE_DIFFUSE, &diffuse);
frMaterialNodeSetInputF(diffuse, "color", 0.5f, 0.5f, 0.5f, 1.f);
frShapeSetMaterial(plane, diffuse);
SIMPLE"RENDER"
"
Create Point Light
Create Mesh
Create shader

Create frame buffer
Render & Save
// Create framebuffer to store rendering result
fr_framebuffer_desc desc;
desc.fb_width = 800;
desc.fb_height = 600;
fr_framebuffer_format fmt = {4, FR_COMPONENT_TYPE_FLOAT32};
fr_framebuffer frame_buffer;
frContextCreateFrameBuffer(context, fmt, &desc, &frame_buffer);
frFrameBufferClear(frame_buffer);
frContextSetAOV(context, FR_AOV_COLOR, frame_buffer);
// Render
frContextRender(context);
// Save the result to file
frFrameBufferSaveToFile(frame_buffer, "simple_render.png");
SIMPLE"RENDER"
"

// Create BXDFs
fr_material_node base, top;
{
frMaterialSystemCreateNode(matsys, FR_MATERIAL_NODE_DIFFUSE, &base);
frMaterialNodeSetInputF(base, "color", r0, g0, b0, 1.f);
frMaterialSystemCreateNode(matsys, FR_MATERIAL_NODE_MICROFACET, &top);
frMaterialNodeSetInputF(top, "color", r1, g1, b1, 1.f);
frMaterialNodeSetInputF(top, "roughness", 0.1f, 0.f, 0.f, 1.f);
}
// Create a layered shader
fr_material_node layered;
{
frMaterialSystemCreateNode(matsys, FR_MATERIAL_NODE_BLEND, &layered);
frMaterialNodeSetInputN(layered, "color0", base);
frMaterialNodeSetInputN(layered, "color1", top);
frMaterialNodeSetInputF(layered, "weight", 0.5f, 0.5f, 0.5f, 1.f);
}+
LAYERED"SHADER"
Blend+
Diﬀuse+ Glossy+ Weight+
+
+
0.5+

PERFORMANCE+

FEBRUARY"2015"""|"""CONFIDENTIAL"
RENDERING"TIME?"
2"X"RADEON"PRO"DUO"@"1280"X"720"

FEBRUARY"2015"""|"""CONFIDENTIAL"
RENDERING"TIME?"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""~"5"SECONDS"

PERFORMANCE"
5s+ 30s+

EXAMPLES+

EXAMPLES"

3DS"MAX"PLUGIN"DEMO"

!  Open"to"registered"developers"
!  hnp://developer.amd.com/toolsQandQsdks/graphicsQdevelopment/
ﬁreproQsdk/amdQﬁrerenderQtechnology/"
!  FirePro.Developers@amd.com"
FIRERENDER"SDK"

FIRERAYS+

!  PhotorealisKc"rendering"
!  Collision"detecKon"
!  ParKcle"physics"
!  Game"AI""
!  Medical"imaging"
!  PredicKve"rendering"
!  Sound"propagaKon"
!  RealQKme"eﬀects"
MOTIVATION"

!  Massively"parallel"architecture"
!  Naïve"approach"does"not"work"on"
GPUs"
!  Variety"of"hardware"to"support"
!  Rapidly"changing"sovware""
‒ DX/GL"
‒ "OpenCL"
‒ "Vulkan/DX12"
‒ "HCC"
GPU"ACCELERATION"

!  Fast"intersecKon"API:""
‒ Best"perf"on"AMD"
‒ CPU/GPU/MGPU"
GPU"ACCELERATION:""FIRERAYS"
!  CrossQpla`orm"
‒ Windows"/"Linux"/""OSX"
!  CrossQvendor"
!  OpenQsource"renderer"
!  Hosted"on"GPUOpen"

!  Triangle"meshes"
!  Instancing"support"
"
GPU"ACCELERATION:""FIRERAYS"
!  Fast"traversal"
!  Ray"masking"
"
!  CPU/GPU"BVH"
!  OpenCL"interop"
"

!  SDK"is"hosted"on"GitHub"
!  Library"binaries:"
‒ "Windows""
‒ "Mac"OS"(coming"soon)"
‒ "Linux"("coming"soon)"
!  OpenQsource"sample"renderer"
‒ "Eﬃcient"streaming"pathQtracer"
‒ "Illustrates"FireRays"usage"
!  Benchmark"
FIRERAYS:"SDK"
hnps://github.com/GPUOpenQLibrariesAndSDKs/FireRays_SDK"

!  High"quality"CPU"SBVH"
‒ "Takes"longer"to"build""
‒ "Fastest"traversal"
‒ "Stackless"and"short"LDS"stack"
‒ "Good"for"ﬁnal"rendering"
FIRERAYS:"TECHNOLOGY"
!  GPU"HLBVH"
‒ "Fastest"build"
‒ "Slower"traversal"(stacked"LDS)"
‒ "Good"for"animaKon"&"preview"

!  Fully"openQsource"
!  Reference"path"tracer"
!  Microkernel"based"
!  Efficient"reQcompacKon"
!  Supports"mulKple"GPUs"
!  Implemented"using"
FireRays"OpenCL"interop"
FIRERAYS:"EXAMPLE"RENDERER"
!  Compound"materials"
‒ "Diffuse"
‒ "ReflecKon"/"refracKon"
‒ "Microfacet"Blinn"/"GGX"/"
Beckmann"
‒ "Blend"
‒ "Bump"
‒ "Volume"scanering"
‒ "SSS""

!  Renderer"developers"
‒ "Easy"integraKon"
‒ "CrossQplaòrm"
FIRERAYS:"APPLICATIONS"
!  CG"researchers"
‒ "Fast"prototyping"
‒ "OpenQsource"renderer"
‒ "Going"fully"openQsource!"
!  Physics"researchers"
‒ "Easy"to"use"API"
‒ "Not"specific"to"CG"
!  Game"developers"
‒ "Light"baking"
‒ "Future"effects"
‒ "We"are"going"Vulkan!"

FIRERAYS:"API"USAGE"
!  Pass"your"meshes"into"FireRays"
!  Setup"ray"buﬀers"
‒ "From"the"host"
‒ "Or"CL"kernel"
!  Query"intersecKons"
!  Handle"intersecKons"
// Enumerate all shapes in the scene !
for (int i = 0; i < (int)shapes.size(); ++i) !
{ !
Shape* shape = nullptr; !
shape = api->CreateMesh(vertices, numvertices, sizeof(float3),
indices, 0, nullptr, numprims);
!
shape->SetTransform(shapes[i].m, inverse(shapes[i].m)); !
api->AttachShape(shape); !
} !
!
api->Commit();!
"
// Intersect ray batch !
api->IntersectBatch(rays[pass & 0x1], hitcount[pass & 0x1], maxrays, intersections, nullptr, nullptr); !

FIRERAYS:"BEST"PRACTICES"
!  Use"two"buﬀers"pingQpong"
‒ "Helps"to"handle"many"bounces"
!  Compact"the"work"
‒ "Helps"to"avoid"divergence"
‒ "Bener"memory"access"
!  Do"not"use"mega"kernels"
‒ "Helps"to"reduce"VGPR"usage"
!  Try"to"generate"coherent"rays"
!  Use"mulKple"API"instances"for"
mGPU"
!  Let"GPUs"work"asynchronously"
!  MonteQCarlo"is"good"to"
distribute"to"mulKple"GPUs"
!  Use"lockQless"interacKon"

FIRERAYS:"EXAMPLE"RENDERER"
! Intersect"ray"buﬀer"
! Evaluate"volume"
! Compact"
! Evaluate"volume"
! Evaluate"surface"
! Extend"path"

!  Web"interface"
‒ "InteracKve"web"product"viewer"
‒ "InteracKve"3D"configurator"
!  Specific"requirements"
‒ "Mainly"jewelry"rendering"
‒ "RGB"is"not"enough"
‒ "Need"realQKme"post"effects"
FIRERAYS:"USECASE"

!  Go"fully"openQsource"on"GPUOpen!"
!  Vulkan"port"
‒ "Gaming"applicaKons"
‒ "Flexible"3DQcompute"interop"
‒ "Asynchronous"operaKon"
!  NonQbatched"mode"
!  FireRender"backend"
FIRERAYS:"WHAT’S"NEXT?"
!  Features"
‒ "Faster"builds"/"traversal"
‒ "Subdivision"&"displacement"
‒ "Out"of"core"
‒ "Improved"moKon"blur"

1 MARCH 2016 | FIRERENDER, FIRERAYS
MARCH 2016 | FIRERENDER, FIRERAYS

2 MARCH 2016 | FIRERENDER, FIRERAYS
MARCH 2016 | FIRERENDER, FIRERAYS
§  We are looking for people who can work with us on Firerender &
FireRays
§  Several posiJons are available
‒ Development of Firerender & FireRays
‒ Research on Monte Carlo ray tracing algorithm
‒ Research on designing algorithm for future AMD’s GPU, CPU architecture
‒ Internship posiJon is also available
§  If you are interested in these, contact me (takahiro.harada@amd.com)
LOOKING FOR PEOPLE WHO CAN WORK WITH US

[2016 GDC] Multiplatform GPU Ray-Tracing Solutions With FireRender and FireRays

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[2016 GDC] Multiplatform GPU Ray-Tracing Solutions With FireRender and FireRays