Carrefully improving the curvature generation performances

libraries/render-utils/src/DebugDeferredBuffer.cpp

@@ -144,7 +144,13 @@ static const std::string DEFAULT_SHADOW_SHADER {
 static const std::string DEFAULT_PYRAMID_DEPTH_SHADER {
     "vec4 getFragmentColor() {"
     "    return vec4(vec3(1.0 - texture(pyramidMap, uv).x * 0.01), 1.0);"
-    //"    return vec4(vec3(1.0 - textureLod(pyramidMap, uv, 3).x * 0.01), 1.0);"
+    " }"
+};
+
+static const std::string DEFAULT_LINEAR_DEPTH_2_SHADER{
+    "vec4 getFragmentColor() {"
+    //  "    return vec4(vec3(1.0 - texture(pyramidMap, uv).x * 0.01), 1.0);"
+    "    return vec4(vec3(1.0 - textureLod(pyramidMap, uv, 1).x * 0.01), 1.0);"
     " }"
 };
 
@@ -252,8 +258,10 @@ std::string DebugDeferredBuffer::getShaderSourceCode(Mode mode, std::string cust
             return DEFAULT_LIGHTING_SHADER;
         case ShadowMode:
             return DEFAULT_SHADOW_SHADER;
-        case PyramidDepthMode:
+        case LinearDepthMode:
             return DEFAULT_PYRAMID_DEPTH_SHADER;
+        case LinearDepth2Mode:
+            return DEFAULT_LINEAR_DEPTH_2_SHADER;
         case CurvatureMode:
             return DEFAULT_CURVATURE_SHADER;
         case NormalCurvatureMode:

libraries/render-utils/src/DebugDeferredBuffer.h

@@ -63,7 +63,8 @@ protected:
         ScatteringMode,
         LightingMode,
         ShadowMode,
-        PyramidDepthMode,
+        LinearDepthMode,
+        LinearDepth2Mode,
         CurvatureMode,
         NormalCurvatureMode,
         DiffusedCurvatureMode,

libraries/render-utils/src/DeferredTransform.slh

@@ -61,6 +61,11 @@ float getProjectionNear() {
     return planeD / planeC;
 }
 
+// positive far distance of the projection
+float getPosLinearDepthFar() {
+    return -frameTransform._depthInfo.z;
+}
+
 mat4 getViewInverse() {
     return frameTransform._viewInverse;
 }

libraries/render-utils/src/RenderDeferredTask.cpp

@@ -103,7 +103,7 @@ RenderDeferredTask::RenderDeferredTask(CullFunctor cullFunctor) {
     const auto fullFrameRangeTimer = addJob<BeginGPURangeTimer>("BeginRangeTimer");
     const auto opaqueRangeTimer = addJob<BeginGPURangeTimer>("BeginOpaqueRangeTimer");
 
-    const auto prepareDeferredInputs = SurfaceGeometryPass::Inputs(primaryFramebuffer, lightingModel).hasVarying();
+    const auto prepareDeferredInputs = PrepareDeferred::Inputs(primaryFramebuffer, lightingModel).hasVarying();
     const auto prepareDeferredOutputs = addJob<PrepareDeferred>("PrepareDeferred", prepareDeferredInputs);
     const auto deferredFramebuffer = prepareDeferredOutputs.getN<PrepareDeferred::Outputs>(0);
     const auto lightingFramebuffer = prepareDeferredOutputs.getN<PrepareDeferred::Outputs>(1);
@@ -117,15 +117,23 @@ RenderDeferredTask::RenderDeferredTask(CullFunctor cullFunctor) {
 
     addJob<EndGPURangeTimer>("OpaqueRangeTimer", opaqueRangeTimer);
 
-    const auto curvatureRangeTimer = addJob<BeginGPURangeTimer>("BeginCurvatureRangeTimer");
 
-    // Opaque all rendered, generate surface geometry buffers
+    // Opaque all rendered
-    const auto surfaceGeometryPassInputs = SurfaceGeometryPass::Inputs(deferredFrameTransform, deferredFramebuffer).hasVarying();
+
+    // Linear Depth Pass
+    const auto linearDepthPassInputs = LinearDepthPass::Inputs(deferredFrameTransform, deferredFramebuffer).hasVarying();
+    const auto linearDepthPassOutputs = addJob<LinearDepthPass>("LinearDepth", linearDepthPassInputs);
+    const auto linearDepthTarget = linearDepthPassOutputs.getN<LinearDepthPass::Outputs>(0);
+    const auto linearDepthTexture = linearDepthPassOutputs.getN<LinearDepthPass::Outputs>(2);
+
+    
+    // Curvature pass
+    const auto surfaceGeometryPassInputs = SurfaceGeometryPass::Inputs(deferredFrameTransform, deferredFramebuffer, linearDepthTarget).hasVarying();
     const auto surfaceGeometryPassOutputs = addJob<SurfaceGeometryPass>("SurfaceGeometry", surfaceGeometryPassInputs);
     const auto surfaceGeometryFramebuffer = surfaceGeometryPassOutputs.getN<SurfaceGeometryPass::Outputs>(0);
     const auto curvatureFramebuffer = surfaceGeometryPassOutputs.getN<SurfaceGeometryPass::Outputs>(1);
-    const auto linearDepthTexture = surfaceGeometryPassOutputs.getN<SurfaceGeometryPass::Outputs>(2);
 
+    const auto curvatureRangeTimer = addJob<BeginGPURangeTimer>("BeginCurvatureRangeTimer");
 
     // TODO: Push this 2 diffusion stages into surfaceGeometryPass as they are working together
     const auto diffuseCurvaturePassInputs = BlurGaussianDepthAware::Inputs(curvatureFramebuffer, linearDepthTexture).hasVarying();

libraries/render-utils/src/SurfaceGeometryPass.cpp

@@ -10,10 +10,15 @@
 //
 #include "SurfaceGeometryPass.h"
 
+#include <limits>
+
 #include <gpu/Context.h>
 #include <gpu/StandardShaderLib.h>
 
 
+const int DepthLinearPass_FrameTransformSlot = 0;
+const int DepthLinearPass_DepthMapSlot = 0;
+
 const int SurfaceGeometryPass_FrameTransformSlot = 0;
 const int SurfaceGeometryPass_ParamsSlot = 1;
 const int SurfaceGeometryPass_DepthMapSlot = 0;
@@ -25,11 +30,11 @@ const int SurfaceGeometryPass_NormalMapSlot = 1;
 
 
 
-SurfaceGeometryFramebuffer::SurfaceGeometryFramebuffer() {
+LinearDepthFramebuffer::LinearDepthFramebuffer() {
 }
 
 
-void SurfaceGeometryFramebuffer::updatePrimaryDepth(const gpu::TexturePointer& depthBuffer) {
+void LinearDepthFramebuffer::updatePrimaryDepth(const gpu::TexturePointer& depthBuffer) {
     //If the depth buffer or size changed, we need to delete our FBOs
     bool reset = false;
     if ((_primaryDepthTexture != depthBuffer)) {
@@ -49,42 +54,173 @@ void SurfaceGeometryFramebuffer::updatePrimaryDepth(const gpu::TexturePointer& d
     }
 }
 
-void SurfaceGeometryFramebuffer::clear() {
+void LinearDepthFramebuffer::clear() {
     _linearDepthFramebuffer.reset();
     _linearDepthTexture.reset();
+}
+
+void LinearDepthFramebuffer::allocate() {
+
+    auto width = _frameSize.x;
+    auto height = _frameSize.y;
+
+    // For Linear Depth:
+    _linearDepthTexture = gpu::TexturePointer(gpu::Texture::create2D(gpu::Element(gpu::SCALAR, gpu::FLOAT, gpu::RGB), width, height,
+        gpu::Sampler(gpu::Sampler::FILTER_MIN_MAG_LINEAR_MIP_POINT)));
+    _linearDepthTexture->autoGenerateMips(1);
+    _linearDepthFramebuffer = gpu::FramebufferPointer(gpu::Framebuffer::create());
+    _linearDepthFramebuffer->setRenderBuffer(0, _linearDepthTexture);
+    _linearDepthFramebuffer->setDepthStencilBuffer(_primaryDepthTexture, _primaryDepthTexture->getTexelFormat());
+}
+
+gpu::FramebufferPointer LinearDepthFramebuffer::getLinearDepthFramebuffer() {
+    if (!_linearDepthFramebuffer) {
+        allocate();
+    }
+    return _linearDepthFramebuffer;
+}
+
+gpu::TexturePointer LinearDepthFramebuffer::getLinearDepthTexture() {
+    if (!_linearDepthTexture) {
+        allocate();
+    }
+    return _linearDepthTexture;
+}
+
+
+LinearDepthPass::LinearDepthPass() {
+}
+
+void LinearDepthPass::configure(const Config& config) {
+}
+
+void LinearDepthPass::run(const render::SceneContextPointer& sceneContext, const render::RenderContextPointer& renderContext, const Inputs& inputs, Outputs& outputs) {
+    assert(renderContext->args);
+    assert(renderContext->args->hasViewFrustum());
+
+    RenderArgs* args = renderContext->args;
+
+    const auto frameTransform = inputs.get0();
+    const auto deferredFramebuffer = inputs.get1();
+
+    if (!_linearDepthFramebuffer) {
+        _linearDepthFramebuffer = std::make_shared<LinearDepthFramebuffer>();
+    }
+    _linearDepthFramebuffer->updatePrimaryDepth(deferredFramebuffer->getPrimaryDepthTexture());
+
+    auto depthBuffer = deferredFramebuffer->getPrimaryDepthTexture();
+    auto normalTexture = deferredFramebuffer->getDeferredNormalTexture();
+
+    auto linearDepthFBO = _linearDepthFramebuffer->getLinearDepthFramebuffer();
+    auto linearDepthTexture = _linearDepthFramebuffer->getLinearDepthTexture();
+
+    outputs.edit0() = _linearDepthFramebuffer;
+    outputs.edit1() = linearDepthFBO;
+    outputs.edit2() = linearDepthTexture;
+
+    auto linearDepthPipeline = getLinearDepthPipeline();
+
+    auto depthViewport = args->_viewport;
+    auto furtherDepth = std::numeric_limits<float>::infinity();
+    furtherDepth = args->getViewFrustum().getFarClip() + 10.0;
+
+    gpu::doInBatch(args->_context, [=](gpu::Batch& batch) {
+        _gpuTimer.begin(batch);
+        batch.enableStereo(false);
+
+        batch.setViewportTransform(depthViewport);
+        batch.setProjectionTransform(glm::mat4());
+        batch.setViewTransform(Transform());
+        batch.setModelTransform(gpu::Framebuffer::evalSubregionTexcoordTransform(_linearDepthFramebuffer->getDepthFrameSize(), depthViewport));
+
+        batch.setUniformBuffer(DepthLinearPass_FrameTransformSlot, frameTransform->getFrameTransformBuffer());
+
+        // Pyramid pass
+        batch.setFramebuffer(linearDepthFBO);
+        batch.clearColorFramebuffer(gpu::Framebuffer::BUFFER_COLOR0, glm::vec4(furtherDepth, 0.0f, 0.0f, 0.0f));
+        batch.setPipeline(linearDepthPipeline);
+        batch.setResourceTexture(DepthLinearPass_DepthMapSlot, depthBuffer);
+        batch.draw(gpu::TRIANGLE_STRIP, 4);
+
+      //  batch.setResourceTexture(DepthLinearPass_DepthMapSlot, nullptr);
+        batch.generateTextureMips(linearDepthFBO->getRenderBuffer(0));
+
+        _gpuTimer.end(batch);
+    });
+
+    auto config = std::static_pointer_cast<Config>(renderContext->jobConfig);
+    config->gpuTime = _gpuTimer.getAverage();
+}
+
+
+const gpu::PipelinePointer& LinearDepthPass::getLinearDepthPipeline() {
+    if (!_linearDepthPipeline) {
+        auto vs = gpu::StandardShaderLib::getDrawViewportQuadTransformTexcoordVS();
+        auto ps = gpu::Shader::createPixel(std::string(surfaceGeometry_makeLinearDepth_frag));
+        gpu::ShaderPointer program = gpu::Shader::createProgram(vs, ps);
+
+        gpu::Shader::BindingSet slotBindings;
+        slotBindings.insert(gpu::Shader::Binding(std::string("deferredFrameTransformBuffer"), DepthLinearPass_FrameTransformSlot));
+        slotBindings.insert(gpu::Shader::Binding(std::string("depthMap"), DepthLinearPass_DepthMapSlot));
+        gpu::Shader::makeProgram(*program, slotBindings);
+
+
+        gpu::StatePointer state = gpu::StatePointer(new gpu::State());
+
+        // Stencil test the curvature pass for objects pixels only, not the background
+        state->setStencilTest(true, 0xFF, gpu::State::StencilTest(0, 0xFF, gpu::NOT_EQUAL, gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP));
+
+        state->setColorWriteMask(true, false, false, false);
+
+        // Good to go add the brand new pipeline
+        _linearDepthPipeline = gpu::Pipeline::create(program, state);
+    }
+
+    return _linearDepthPipeline;
+}
+
+
+
+SurfaceGeometryFramebuffer::SurfaceGeometryFramebuffer() {
+}
+
+void SurfaceGeometryFramebuffer::updateLinearDepth(const gpu::TexturePointer& linearDepthBuffer) {
+    //If the depth buffer or size changed, we need to delete our FBOs
+    bool reset = false;
+    if ((_linearDepthTexture != linearDepthBuffer)) {
+        _linearDepthTexture = linearDepthBuffer;
+        reset = true;
+    }
+    if (_linearDepthTexture) {
+        auto newFrameSize = glm::ivec2(_linearDepthTexture->getDimensions());
+        if (_frameSize != newFrameSize) {
+            _frameSize = newFrameSize;
+            reset = true;
+        }
+    }
+
+    if (reset) {
+        clear();
+    }
+}
+
+void SurfaceGeometryFramebuffer::clear() {
     _curvatureFramebuffer.reset();
     _curvatureTexture.reset();
 }
 
+gpu::TexturePointer SurfaceGeometryFramebuffer::getLinearDepthTexture() {
+    return _linearDepthTexture;
+}
+
 void SurfaceGeometryFramebuffer::allocate() {
 
     auto width = _frameSize.x;
     auto height = _frameSize.y;
 
-    // For Linear Depth:
-    _linearDepthTexture = gpu::TexturePointer(gpu::Texture::create2D(gpu::Element(gpu::SCALAR, gpu::FLOAT, gpu::RGB), width, height, gpu::Sampler(gpu::Sampler::FILTER_MIN_MAG_LINEAR_MIP_POINT)));
-    _linearDepthFramebuffer = gpu::FramebufferPointer(gpu::Framebuffer::create());
-    _linearDepthFramebuffer->setRenderBuffer(0, _linearDepthTexture);
-    _linearDepthFramebuffer->setDepthStencilBuffer(_primaryDepthTexture, _primaryDepthTexture->getTexelFormat());
-
     _curvatureTexture = gpu::TexturePointer(gpu::Texture::create2D(gpu::Element::COLOR_RGBA_32, width >> getResolutionLevel(), height >> getResolutionLevel(), gpu::Sampler(gpu::Sampler::FILTER_MIN_MAG_LINEAR_MIP_POINT)));
     _curvatureFramebuffer = gpu::FramebufferPointer(gpu::Framebuffer::create());
     _curvatureFramebuffer->setRenderBuffer(0, _curvatureTexture);
-//    _curvatureFramebuffer->setDepthStencilBuffer(_primaryDepthTexture, _primaryDepthTexture->getTexelFormat());
-}
-
-gpu::FramebufferPointer SurfaceGeometryFramebuffer::getLinearDepthFramebuffer() {
-    if (!_linearDepthFramebuffer) {
-        allocate();
-    }
-    return _linearDepthFramebuffer;
-}
-
-gpu::TexturePointer SurfaceGeometryFramebuffer::getLinearDepthTexture() {
-    if (!_linearDepthTexture) {
-        allocate();
-    }
-    return _linearDepthTexture;
 }
 
 gpu::FramebufferPointer SurfaceGeometryFramebuffer::getCurvatureFramebuffer() {
@@ -108,7 +244,6 @@ void SurfaceGeometryFramebuffer::setResolutionLevel(int resolutionLevel) {
     }
 }
 
-
 SurfaceGeometryPass::SurfaceGeometryPass() {
     Parameters parameters;
     _parametersBuffer = gpu::BufferView(std::make_shared<gpu::Buffer>(sizeof(Parameters), (const gpu::Byte*) &parameters));
@@ -135,7 +270,7 @@ void SurfaceGeometryPass::configure(const Config& config) {
 }
 
 
-void SurfaceGeometryPass::run(const render::SceneContextPointer& sceneContext, const render::RenderContextPointer& renderContext, const Inputs& inputs, Outputs& curvatureAndDepth) {
+void SurfaceGeometryPass::run(const render::SceneContextPointer& sceneContext, const render::RenderContextPointer& renderContext, const Inputs& inputs, Outputs& outputs) {
     assert(renderContext->args);
     assert(renderContext->args->hasViewFrustum());
 
@@ -143,31 +278,28 @@ void SurfaceGeometryPass::run(const render::SceneContextPointer& sceneContext, c
 
     const auto frameTransform = inputs.get0();
     const auto deferredFramebuffer = inputs.get1();
+    const auto linearDepthFramebuffer = inputs.get2();
+
+    auto linearDepthTexture = linearDepthFramebuffer->getLinearDepthTexture();
 
     if (!_surfaceGeometryFramebuffer) {
         _surfaceGeometryFramebuffer = std::make_shared<SurfaceGeometryFramebuffer>();
     }
-    _surfaceGeometryFramebuffer->updatePrimaryDepth(deferredFramebuffer->getPrimaryDepthTexture());
+    _surfaceGeometryFramebuffer->updateLinearDepth(linearDepthTexture);
 
-    auto depthBuffer = deferredFramebuffer->getPrimaryDepthTexture();
     auto normalTexture = deferredFramebuffer->getDeferredNormalTexture();
 
-    auto linearDepthFBO = _surfaceGeometryFramebuffer->getLinearDepthFramebuffer();
-    auto linearDepthTexture = _surfaceGeometryFramebuffer->getLinearDepthTexture();
     auto curvatureFBO = _surfaceGeometryFramebuffer->getCurvatureFramebuffer();
+    if (curvatureFBO->getDepthStencilBuffer() != deferredFramebuffer->getPrimaryDepthTexture()) {
+        curvatureFBO->setDepthStencilBuffer(deferredFramebuffer->getPrimaryDepthTexture(), deferredFramebuffer->getPrimaryDepthTexture()->getTexelFormat());
+    }
         auto curvatureTexture = _surfaceGeometryFramebuffer->getCurvatureTexture();
 
-    curvatureAndDepth.edit0() = _surfaceGeometryFramebuffer;
+    outputs.edit0() = _surfaceGeometryFramebuffer;
-    curvatureAndDepth.edit1() = curvatureFBO;
+    outputs.edit1() = curvatureFBO;
-    curvatureAndDepth.edit2() = linearDepthTexture;
 
-    auto linearDepthPipeline = getLinearDepthPipeline();
     auto curvaturePipeline = getCurvaturePipeline();
 
-  //   gpu::doInBatch(args->_context, [&](gpu::Batch& batch) {
-  //   _gpuTimer.begin(batch);
-  //   });
-    
     auto depthViewport = args->_viewport;
     auto curvatureViewport = depthViewport >> _surfaceGeometryFramebuffer->getResolutionLevel();
 
@@ -175,70 +307,34 @@ void SurfaceGeometryPass::run(const render::SceneContextPointer& sceneContext, c
         _gpuTimer.begin(batch);
         batch.enableStereo(false);
 
-        batch.setViewportTransform(depthViewport);
         batch.setProjectionTransform(glm::mat4());
         batch.setViewTransform(Transform());
-        batch.setModelTransform(gpu::Framebuffer::evalSubregionTexcoordTransform(_surfaceGeometryFramebuffer->getDepthFrameSize(), depthViewport));
-
-        batch.setUniformBuffer(SurfaceGeometryPass_FrameTransformSlot, frameTransform->getFrameTransformBuffer());
-        batch.setUniformBuffer(SurfaceGeometryPass_ParamsSlot, _parametersBuffer);
-
-        // Pyramid pass
-        batch.setFramebuffer(linearDepthFBO);
-        batch.clearColorFramebuffer(gpu::Framebuffer::BUFFER_COLOR0, glm::vec4(args->getViewFrustum().getFarClip(), 0.0f, 0.0f, 0.0f));
-        batch.setPipeline(linearDepthPipeline);
-        batch.setResourceTexture(SurfaceGeometryPass_DepthMapSlot, depthBuffer);
-        batch.draw(gpu::TRIANGLE_STRIP, 4);
 
         batch.setViewportTransform(curvatureViewport);
         batch.setModelTransform(gpu::Framebuffer::evalSubregionTexcoordTransform(_surfaceGeometryFramebuffer->getCurvatureFrameSize(), curvatureViewport));
 
+        batch.setUniformBuffer(SurfaceGeometryPass_FrameTransformSlot, frameTransform->getFrameTransformBuffer());
+        batch.setUniformBuffer(SurfaceGeometryPass_ParamsSlot, _parametersBuffer);
+
         // Curvature pass
         batch.setFramebuffer(curvatureFBO);
-        batch.clearColorFramebuffer(gpu::Framebuffer::BUFFER_COLOR0, glm::vec4(0.0));
+       //    batch.clearColorFramebuffer(gpu::Framebuffer::BUFFER_COLOR0, glm::vec4(0.0));
+
         batch.setPipeline(curvaturePipeline);
         batch.setResourceTexture(SurfaceGeometryPass_DepthMapSlot, linearDepthTexture);
         batch.setResourceTexture(SurfaceGeometryPass_NormalMapSlot, normalTexture);
         batch.draw(gpu::TRIANGLE_STRIP, 4);
+
         batch.setResourceTexture(SurfaceGeometryPass_DepthMapSlot, nullptr);
         batch.setResourceTexture(SurfaceGeometryPass_NormalMapSlot, nullptr);
 
         _gpuTimer.end(batch);
     });
 
-   // gpu::doInBatch(args->_context, [&](gpu::Batch& batch) {
-   //  _gpuTimer.end(batch);
-   //  });
-
     auto config = std::static_pointer_cast<Config>(renderContext->jobConfig);
     config->gpuTime = _gpuTimer.getAverage();
 }
 
-const gpu::PipelinePointer& SurfaceGeometryPass::getLinearDepthPipeline() {
-    if (!_linearDepthPipeline) {
-        auto vs = gpu::StandardShaderLib::getDrawViewportQuadTransformTexcoordVS();
-        auto ps = gpu::Shader::createPixel(std::string(surfaceGeometry_makeLinearDepth_frag));
-        gpu::ShaderPointer program = gpu::Shader::createProgram(vs, ps);
-        
-        gpu::Shader::BindingSet slotBindings;
-        slotBindings.insert(gpu::Shader::Binding(std::string("deferredFrameTransformBuffer"), SurfaceGeometryPass_FrameTransformSlot));
-        slotBindings.insert(gpu::Shader::Binding(std::string("linearDepthMap"), SurfaceGeometryPass_DepthMapSlot));
-        gpu::Shader::makeProgram(*program, slotBindings);
-        
-        
-        gpu::StatePointer state = gpu::StatePointer(new gpu::State());
-        
-        // Stencil test the curvature pass for objects pixels only, not the background
-        state->setStencilTest(true, 0xFF, gpu::State::StencilTest(0, 0xFF, gpu::NOT_EQUAL, gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP, gpu::State::STENCIL_OP_KEEP));
-        
-        state->setColorWriteMask(true, false, false, false);
-        
-        // Good to go add the brand new pipeline
-        _linearDepthPipeline = gpu::Pipeline::create(program, state);
-    }
-    
-    return _linearDepthPipeline;
-}
 
 const gpu::PipelinePointer& SurfaceGeometryPass::getCurvaturePipeline() {
     if (!_curvaturePipeline) {

libraries/render-utils/src/SurfaceGeometryPass.h

@@ -19,23 +19,19 @@
 #include "DeferredFramebuffer.h"
 
 
-// SurfaceGeometryFramebuffer is  a helper class gathering in one place theframebuffers and targets describing the surface geometry linear depth and curvature generated
+// SurfaceGeometryFramebuffer is  a helper class gathering in one place theframebuffers and targets describing the surface geometry linear depth
-// from a z buffer and a normal buffer
+// from a z buffer
-class SurfaceGeometryFramebuffer {
+class LinearDepthFramebuffer {
 public:
-    SurfaceGeometryFramebuffer();
+    LinearDepthFramebuffer();
 
     gpu::FramebufferPointer getLinearDepthFramebuffer();
     gpu::TexturePointer getLinearDepthTexture();
 
-    gpu::FramebufferPointer getCurvatureFramebuffer();
-    gpu::TexturePointer getCurvatureTexture();
-    
     // Update the depth buffer which will drive the allocation of all the other resources according to its size.
     void updatePrimaryDepth(const gpu::TexturePointer& depthBuffer);
     gpu::TexturePointer getPrimaryDepthTexture();
     const glm::ivec2& getDepthFrameSize() const { return _frameSize; }
-    glm::ivec2 getCurvatureFrameSize() const { return _frameSize >> _resolutionLevel; }
 
     void setResolutionLevel(int level);
     int getResolutionLevel() const { return _resolutionLevel; }
@@ -49,6 +45,76 @@ protected:
     gpu::FramebufferPointer _linearDepthFramebuffer;
     gpu::TexturePointer _linearDepthTexture;
     
+    glm::ivec2 _frameSize;
+    int _resolutionLevel{ 0 };
+};
+
+using LinearDepthFramebufferPointer = std::shared_ptr<LinearDepthFramebuffer>;
+
+
+class LinearDepthPassConfig : public render::Job::Config {
+    Q_OBJECT
+    Q_PROPERTY(double gpuTime READ getGpuTime)
+public:
+    LinearDepthPassConfig() : render::Job::Config(true) {}
+
+    double getGpuTime() { return gpuTime; }
+
+    double gpuTime{ 0.0 };
+
+signals:
+    void dirty();
+};
+
+class LinearDepthPass {
+public:
+    using Inputs = render::VaryingSet2<DeferredFrameTransformPointer, DeferredFramebufferPointer>;
+    using Outputs = render::VaryingSet3<LinearDepthFramebufferPointer, gpu::FramebufferPointer, gpu::TexturePointer>;
+    using Config = LinearDepthPassConfig;
+    using JobModel = render::Job::ModelIO<LinearDepthPass, Inputs, Outputs, Config>;
+
+    LinearDepthPass();
+
+    void configure(const Config& config);
+    void run(const render::SceneContextPointer& sceneContext, const render::RenderContextPointer& renderContext, const Inputs& inputs, Outputs& outputs);
+    
+private:
+    typedef gpu::BufferView UniformBufferView;
+
+    LinearDepthFramebufferPointer _linearDepthFramebuffer;
+
+    const gpu::PipelinePointer& getLinearDepthPipeline();
+
+    gpu::PipelinePointer _linearDepthPipeline;
+
+    gpu::RangeTimer _gpuTimer;
+};
+
+
+// SurfaceGeometryFramebuffer is  a helper class gathering in one place theframebuffers and targets describing the surface geometry linear depth and curvature generated
+// from a z buffer and a normal buffer
+class SurfaceGeometryFramebuffer {
+public:
+    SurfaceGeometryFramebuffer();
+
+    gpu::FramebufferPointer getCurvatureFramebuffer();
+    gpu::TexturePointer getCurvatureTexture();
+
+    // Update the source framebuffer size which will drive the allocation of all the other resources.
+    void updateLinearDepth(const gpu::TexturePointer& linearDepthBuffer);
+    gpu::TexturePointer getLinearDepthTexture();
+    const glm::ivec2& getSourceFrameSize() const { return _frameSize; }
+    glm::ivec2 getCurvatureFrameSize() const { return _frameSize >> _resolutionLevel; }
+
+    void setResolutionLevel(int level);
+    int getResolutionLevel() const { return _resolutionLevel; }
+
+protected:
+    void clear();
+    void allocate();
+
+    gpu::TexturePointer _linearDepthTexture;
+
     gpu::FramebufferPointer _curvatureFramebuffer;
     gpu::TexturePointer _curvatureTexture;
 
@@ -83,15 +149,15 @@ signals:
 
 class SurfaceGeometryPass {
 public:
-    using Inputs = render::VaryingSet2<DeferredFrameTransformPointer, DeferredFramebufferPointer>;
+    using Inputs = render::VaryingSet3<DeferredFrameTransformPointer, DeferredFramebufferPointer, LinearDepthFramebufferPointer>;
-    using Outputs = render::VaryingSet3<SurfaceGeometryFramebufferPointer, gpu::FramebufferPointer, gpu::TexturePointer>;
+    using Outputs = render::VaryingSet2<SurfaceGeometryFramebufferPointer, gpu::FramebufferPointer>;
     using Config = SurfaceGeometryPassConfig;
     using JobModel = render::Job::ModelIO<SurfaceGeometryPass, Inputs, Outputs, Config>;
 
     SurfaceGeometryPass();
 
     void configure(const Config& config);
-    void run(const render::SceneContextPointer& sceneContext, const render::RenderContextPointer& renderContext, const Inputs& inputs, Outputs& curvatureAndDepth);
+    void run(const render::SceneContextPointer& sceneContext, const render::RenderContextPointer& renderContext, const Inputs& inputs, Outputs& outputs);
     
     float getCurvatureDepthThreshold() const { return _parametersBuffer.get<Parameters>().curvatureInfo.x; }
     float getCurvatureBasisScale() const { return _parametersBuffer.get<Parameters>().curvatureInfo.y; }
@@ -114,10 +180,8 @@ private:
 
     SurfaceGeometryFramebufferPointer _surfaceGeometryFramebuffer;
 
-    const gpu::PipelinePointer& getLinearDepthPipeline();
     const gpu::PipelinePointer& getCurvaturePipeline();
 
-    gpu::PipelinePointer _linearDepthPipeline;
     gpu::PipelinePointer _curvaturePipeline;
 
 

libraries/render-utils/src/surfaceGeometry_makeCurvature.slf

@@ -109,6 +109,11 @@ void main(void) {
 
     // Fetch the z under the pixel (stereo or not)
     float Zeye = getZEye(framePixelPos);
+    if (Zeye <= -getPosLinearDepthFar()) {
+       // outFragColor = vec4(0.0);
+       // return;
+        discard;
+    }
 
     float nearPlaneScale = 0.5 * getProjectionNear();
 

libraries/render/src/render/BlurTask.cpp

@@ -78,6 +78,14 @@ void BlurParams::setDepthThreshold(float threshold) {
     }
 }
 
+void BlurParams::setLinearDepthPosFar(float farPosDepth) {
+    auto linearDepthInfo = _parametersBuffer.get<Params>().linearDepthInfo;
+    if (farPosDepth != linearDepthInfo.x) {
+        _parametersBuffer.edit<Params>().linearDepthInfo.x = farPosDepth;
+    }
+}
+
+
 BlurInOutResource::BlurInOutResource(bool generateOutputFramebuffer) :
 _generateOutputFramebuffer(generateOutputFramebuffer)
 {
@@ -220,6 +228,7 @@ void BlurGaussian::run(const SceneContextPointer& sceneContext, const RenderCont
     _parameters->setWidthHeight(args->_viewport.z, args->_viewport.w, args->_context->isStereo());
     glm::ivec2 textureSize(blurringResources.sourceTexture->getDimensions());
     _parameters->setTexcoordTransform(gpu::Framebuffer::evalSubregionTexcoordTransformCoefficients(textureSize, args->_viewport));
+    _parameters->setLinearDepthPosFar(args->getViewFrustum().getFarClip());
 
     gpu::doInBatch(args->_context, [=](gpu::Batch& batch) {
         batch.enableStereo(false);

libraries/render/src/render/BlurTask.h

@@ -29,6 +29,8 @@ public:
     void setDepthPerspective(float oneOverTan2FOV);
     void setDepthThreshold(float threshold);
 
+    void setLinearDepthPosFar(float farPosDepth);
+
     // Class describing the uniform buffer with all the parameters common to the blur shaders
     class Params {
     public:
@@ -47,6 +49,9 @@ public:
         // stereo info if blurring a stereo render
         glm::vec4 stereoInfo{ 0.0f };
 
+        // LinearDepth info is { f }
+        glm::vec4 linearDepthInfo{ 0.0f };
+
         Params() {}
     };
     gpu::BufferView _parametersBuffer;

libraries/render/src/render/BlurTask.slh

@@ -27,6 +27,7 @@ struct BlurParameters {
     vec4 filterInfo;
     vec4 depthInfo;
     vec4 stereoInfo;
+    vec4 linearDepthInfo;
 };
 
 uniform blurParamsBuffer {
@@ -54,6 +55,10 @@ float getDepthPerspective() {
     return parameters.depthInfo.w;
 }
 
+float getPosLinearDepthFar() {
+    return parameters.linearDepthInfo.x;
+}
+
 <@endfunc@>
 
 
@@ -92,8 +97,12 @@ uniform sampler2D depthMap;
 
 vec4 pixelShaderGaussianDepthAware(vec2 texcoord, vec2 direction, vec2 pixelStep) {
     texcoord = evalTexcoordTransformed(texcoord);
-    float sampleDepth = texture(depthMap, texcoord).x;
+    float sampleDepth = -texture(depthMap, texcoord).x;
     vec4 sampleCenter = texture(sourceMap, texcoord);
+    if (sampleDepth <= getPosLinearDepthFar()) {
+        discard;
+        //return sampleCenter;
+    }
 
     // Calculate the width scale.
     float distanceToProjectionWindow = getDepthPerspective();

scripts/developer/utilities/render/deferredLighting.qml

@@ -151,6 +151,7 @@ Column {
                 ListElement { text: "Lighting"; color: "White" }
                 ListElement { text: "Shadow"; color: "White" }
                 ListElement { text: "Linear Depth"; color: "White" }
+                ListElement { text: "Linear Depth LOD2"; color: "White" }
                 ListElement { text: "Mid Curvature"; color: "White" }
                 ListElement { text: "Mid Normal"; color: "White" }
                 ListElement { text: "Low Curvature"; color: "White" }

scripts/developer/utilities/render/statsGPU.qml

@@ -41,9 +41,14 @@ Item {
                    object: Render.getConfig("OpaqueRangeTimer"),
                    prop: "gpuTime",
                    label: "Opaque",
-                   color: "#0000FF"
+                   color: "#FFFFFF"
                }, 
                {
+                   object: Render.getConfig("LinearDepth"),
+                   prop: "gpuTime",
+                   label: "LinearDepth",
+                   color: "#00FF00"
+               },{
                    object: Render.getConfig("SurfaceGeometry"),
                    prop: "gpuTime",
                    label: "SurfaceGeometry",