Render depth buffer to quad

Useful for graphics debugging

libraries/render-utils/src/AmbientOcclusionEffect.cpp

@@ -27,6 +27,7 @@
 #include "TextureCache.h"
 #include "DependencyManager.h"
 #include "ViewFrustum.h"
+#include "GeometryCache.h"
 
 #include "ambient_occlusion_vert.h"
 #include "ambient_occlusion_frag.h"
@@ -190,10 +191,10 @@ const gpu::PipelinePointer& AmbientOcclusion::getAOPipeline() {
 
         gpu::StatePointer state = gpu::StatePointer(new gpu::State());
 
-        state->setDepthTest(true, false, gpu::LESS_EQUAL);
+        state->setDepthTest(false, false, gpu::LESS_EQUAL);
 
         // Blend on transparent
-        state->setBlendFunction(true,
+        state->setBlendFunction(false,
             gpu::State::SRC_ALPHA, gpu::State::BLEND_OP_ADD, gpu::State::INV_SRC_ALPHA,
             gpu::State::DEST_ALPHA, gpu::State::BLEND_OP_ADD, gpu::State::ZERO);
 
@@ -225,11 +226,17 @@ void AmbientOcclusion::run(const render::SceneContextPointer& sceneContext, cons
     batch.setProjectionTransform(projMat);
     batch.setViewTransform(viewMat);
     batch.setModelTransform(Transform());
+    batch.setResourceTexture(0, DependencyManager::get<TextureCache>()->getPrimaryDepthTexture());
 
     // bind the one gpu::Pipeline we need
     batch.setPipeline(getAOPipeline());
 
-    //renderFullscreenQuad();
+    glm::vec4 color(0.0f, 0.0f, 0.0f, 1.0f);
+    glm::vec2 bottomLeft(0.5f, -1.0f);
+    glm::vec2 topRight(1.0f, -0.5f);
+    glm::vec2 texCoordTopLeft(0.0f, 0.0f);
+    glm::vec2 texCoordBottomRight(1.0f, 1.0f);
+    DependencyManager::get<GeometryCache>()->renderQuad(batch, bottomLeft, topRight, texCoordTopLeft, texCoordBottomRight, color);
 
     args->_context->syncCache();
     renderContext->args->_context->syncCache();

libraries/render-utils/src/RenderDeferredTask.cpp

@@ -59,6 +59,7 @@ RenderDeferredTask::RenderDeferredTask() : Task() {
     _jobs.push_back(Job(new ResetGLState::JobModel()));
     _jobs.push_back(Job(new RenderDeferred::JobModel("RenderDeferred")));
     _jobs.push_back(Job(new ResolveDeferred::JobModel("ResolveDeferred")));
+    _jobs.push_back(Job(new AmbientOcclusion::JobModel("AmbientOcclusion")));
     _jobs.push_back(Job(new FetchItems::JobModel("FetchTransparent",
          FetchItems(
             ItemFilter::Builder::transparentShape().withoutLayered(),
@@ -77,8 +78,9 @@ RenderDeferredTask::RenderDeferredTask() : Task() {
     _jobs.back().setEnabled(false);
     _drawStatusJobIndex = _jobs.size() - 1;
 
+    //_jobs.push_back(Job(new AmbientOcclusion::JobModel("AmbientOcclusion")));
     _jobs.push_back(Job(new DrawOverlay3D::JobModel("DrawOverlay3D")));
-    _jobs.push_back(Job(new AmbientOcclusion::JobModel("AmbientOcclusion")));
+
     _jobs.push_back(Job(new ResetGLState::JobModel()));
 
     // Give ourselves 3 frmaes of timer queries

libraries/render-utils/src/ambient_occlusion.slf

@@ -2,11 +2,11 @@
 <$VERSION_HEADER$>
 //  Generated on <$_SCRIBE_DATE$>
 //
-//  simple.frag
+//  ambient_occlusion.frag
 //  fragment shader
 //
-//  Created by Andrzej Kapolka on 9/15/14.
+//  Created by Niraj Venkat on 7/15/15.
-//  Copyright 2014 High Fidelity, Inc.
+//  Copyright 2015 High Fidelity, Inc.
 //
 //  Distributed under the Apache License, Version 2.0.
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
@@ -17,6 +17,16 @@
 // the interpolated normal
 //varying vec4 interpolatedNormal;
 
+varying vec2 varTexcoord;
+
+uniform sampler2D depthTexture;
+
 void main(void) {
-    gl_FragColor = vec4(0.0, 1.0, 1.0, 1.0);
+	vec4 depthColor = texture2D(depthTexture, varTexcoord.xy);
+    float z = depthColor.r;                       // fetch the z-value from our depth texture
+    float n = 1.0;                                // the near plane
+    float f = 30.0;                               // the far plane
+    float c = (2.0 * n) / (f + n - z * (f - n));  // convert to linear values 
+
+    gl_FragColor = vec4(c, c, c, 1.0); 
 }

libraries/render-utils/src/ambient_occlusion.slv

@@ -2,11 +2,11 @@
 <$VERSION_HEADER$>
 //  Generated on <$_SCRIBE_DATE$>
 //
-//  simple.vert
+//  ambient_occlusion.vert
 //  vertex shader
 //
-//  Created by Andrzej Kapolka on 9/15/14.
+//  Created by Niraj Venkat on 7/15/15.
-//  Copyright 2014 High Fidelity, Inc.
+//  Copyright 2015 High Fidelity, Inc.
 //
 //  Distributed under the Apache License, Version 2.0.
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
@@ -18,8 +18,9 @@
 
 // the interpolated normal
 //varying vec4 interpolatedNormal;
+varying vec2 varTexcoord;
 
 void main(void) {
-    //gl_TexCoord[0] = gl_MultiTexCoord0;
+    varTexcoord = gl_MultiTexCoord0.xy;
     gl_Position = gl_Vertex;
 }