FIxed the stereo rendering

examples/utilities/tools/renderEngineDebug.js

@@ -52,11 +52,13 @@ var overlaysCounter = new CounterWidget(panel, "Overlays", Render.overlay3D);
 
 var resizing = false;
 var previousMode = Settings.getValue(SETTINGS_KEY, -1);
-previousMode = 1; // FIXME: just for debug purpose
+previousMode = 8; // FIXME: just for debug purpose
 Menu.addActionGroup(MENU, ACTIONS, ACTIONS[previousMode + 1]);
 Render.deferredDebugMode = previousMode;
 Render.deferredDebugSize = { x: 0.0, y: -1.0, z: 1.0, w: 1.0 }; // Reset to default size
 
+Render.deferredDebugSize = { x: -0.5, y: -1.0, z: 1.0, w: 1.0 }; // Reset to default size
+
 function setEngineDeferredDebugSize(eventX) {
     var scaledX = (2.0 * (eventX / Window.innerWidth) - 1.0).clamp(-1.0, 1.0);
     Render.deferredDebugSize = { x: scaledX, y: -1.0, z: 1.0, w: 1.0 };

libraries/render-utils/src/AmbientOcclusionEffect.cpp

@@ -178,8 +178,8 @@ void AmbientOcclusionEffect::setLevel(float level) {
 
 void AmbientOcclusionEffect::setDithering(bool enabled) {
     if (enabled != isDitheringEnabled()) {
-        auto& current = _parametersBuffer.edit<Parameters>()._sampleInfo;
-        current.w = (float)enabled;
+        auto& current = _parametersBuffer.edit<Parameters>()._ditheringInfo;
+        current.x = (float)enabled;
     }
 }
 
@@ -331,16 +331,47 @@ void AmbientOcclusionEffect::run(const render::SceneContextPointer& sceneContext
 
     updateDeferredTransformBuffer(renderContext);
 
-    // Eval the mono projection
-    mat4 monoProjMat;
-    args->_viewFrustum->evalProjectionMatrix(monoProjMat);
-
+    // Update the depth info with near and far (same for stereo)
     setDepthInfo(args->_viewFrustum->getNearClip(), args->_viewFrustum->getFarClip());
-    _parametersBuffer.edit<Parameters>()._projection[0] = monoProjMat;
-    _parametersBuffer.edit<Parameters>()._pixelInfo = args->_viewport;
-    _parametersBuffer.edit<Parameters>()._ditheringInfo.y += 0.25f;
 
 
+    _parametersBuffer.edit<Parameters>()._pixelInfo = args->_viewport;
+    //_parametersBuffer.edit<Parameters>()._ditheringInfo.y += 0.25f;
+
+    // Running in stero ?
+    bool isStereo = args->_context->isStereo();
+    if (!isStereo) {
+        // Eval the mono projection
+        mat4 monoProjMat;
+        args->_viewFrustum->evalProjectionMatrix(monoProjMat);
+        _parametersBuffer.edit<Parameters>()._projection[0] = monoProjMat;
+        _parametersBuffer.edit<Parameters>()._stereoInfo = glm::vec4(0.0f, args->_viewport.z, 0.0f, 0.0f);
+
+    } else {
+
+        mat4 projMats[2];
+        Transform viewTransforms[2];
+
+        DeferredTransform deferredTransforms[2];
+
+
+        mat4 eyeViews[2];
+        args->_context->getStereoProjections(projMats);
+        args->_context->getStereoViews(eyeViews);
+
+        float halfWidth = 0.5f * sWidth;
+
+        for (int i = 0; i < 2; i++) {
+            // Compose the mono Eye space to Stereo clip space Projection Matrix
+            auto sideViewMat = projMats[i] * eyeViews[i];
+
+            _parametersBuffer.edit<Parameters>()._projection[i] = sideViewMat;
+        }
+
+        _parametersBuffer.edit<Parameters>()._stereoInfo = glm::vec4(1.0f, (float)(args->_viewport.z >> 1), 0.0f, 1.0f);
+
+    }
+
     auto pyramidPipeline = getPyramidPipeline();
     auto occlusionPipeline = getOcclusionPipeline();
     auto firstHBlurPipeline = getHBlurPipeline();

libraries/render-utils/src/AmbientOcclusionEffect.h

@@ -31,7 +31,7 @@ public:
     float getLevel() const { return _parametersBuffer.get<Parameters>()._radiusInfo.w; }
 
     void setDithering(bool enabled);
-    bool isDitheringEnabled() const { return _parametersBuffer.get<Parameters>()._ditheringInfo.w; }
+    bool isDitheringEnabled() const { return _parametersBuffer.get<Parameters>()._ditheringInfo.x; }
 
     // Number of samples per pixel to evaluate the Obscurance
     void setNumSamples(int numSamples);
@@ -57,7 +57,7 @@ private:
         // radius info is { R, R^2, 1 / R^6, ObscuranceScale}
         glm::vec4 _radiusInfo{ 0.5, 0.5 * 0.5, 1.0 / (0.25 * 0.25 * 0.25), 1.0 };
         // Dithering info
-        glm::vec4 _ditheringInfo{ 1.0, 0.0, 0.0, 0.0 };
+        glm::vec4 _ditheringInfo{ 0.0, 0.0, 0.0, 0.0 };
         // Sampling info
         glm::vec4 _sampleInfo{ 11.0, 1.0/11.0, 7.0, 1.0 };
         // Blurring info
@@ -66,6 +66,8 @@ private:
         glm::vec4 _pixelInfo;
         // Depth info is { n.f, f - n, -f}
         glm::vec4 _depthInfo;
+        // Stereo info
+        glm::vec4 _stereoInfo{ 0.0 };
         // Mono proj matrix or Left and Right proj matrix going from Mono Eye space to side clip space
         glm::mat4 _projection[2];
         

libraries/render-utils/src/ssao.slh

@@ -38,6 +38,7 @@ struct AmbientOcclusionParams {
     vec4 _blurInfo;
     vec4 _pixelInfo;
     vec4 _depthInfo;
+    vec4 _stereoInfo;
     mat4 _projection[2];
 };
 
@@ -90,16 +91,20 @@ float getBlurEdgeSharpness() {
     return params._blurInfo.x;
 }
 
-float evalZeyeFromZdb(float depth) {
-    return params._depthInfo.x / (depth * params._depthInfo.y + params._depthInfo.z);
+bool isStereo() {
+    return params._stereoInfo.x > 0.0f;
 }
 
-vec3 evalEyePositionFromZeye(float Zeye, vec2 texcoord) {
-    // compute the view space position using the depth
-    // basically manually pick the proj matrix components to do the inverse
-    float Xe = (-Zeye * (texcoord.x * 2.0 - 1.0) - Zeye * params._projection[0][2][0] - params._projection[0][3][0]) / params._projection[0][0][0];
-    float Ye = (-Zeye * (texcoord.y * 2.0 - 1.0) - Zeye * params._projection[0][2][1] - params._projection[0][3][1]) / params._projection[0][1][1];
-    return vec3(Xe, Ye, Zeye);
+ivec2 getStereoSideInfo(int xPos) {
+    return (xPos < params._stereoInfo.y ? ivec2(0, 0) : ivec2(1, int(params._stereoInfo.y)) );
+}
+
+float getStereoSideWidth() {
+    return (params._stereoInfo.y);
+}
+
+float evalZeyeFromZdb(float depth) {
+    return params._depthInfo.x / (depth * params._depthInfo.y + params._depthInfo.z);
 }
 
 vec3 evalEyeNormal(vec3 C) {

libraries/render-utils/src/ssao_makeOcclusion.slf

@@ -20,9 +20,16 @@ const int MAX_MIP_LEVEL = 5;
 // the depth pyramid texture
 uniform sampler2D pyramidMap;
 
-vec3 evalEyePosition(vec2 texcoord) {
-    float Zeye = -texture(pyramidMap, texcoord, 0).x;
-    return evalEyePositionFromZeye(Zeye, texcoord);
+float getZEye(ivec2 pixel) {
+    return -texelFetch(pyramidMap, pixel, 0).x;
+}
+
+vec3 evalEyePositionFromZeye(ivec2 side, float Zeye, vec2 texcoord) {
+    // compute the view space position using the depth
+    // basically manually pick the proj matrix components to do the inverse
+    float Xe = (-Zeye * (texcoord.x * 2.0 - 1.0) - Zeye * params._projection[side.x][2][0] - params._projection[side.x][3][0]) / params._projection[side.x][0][0];
+    float Ye = (-Zeye * (texcoord.y * 2.0 - 1.0) - Zeye * params._projection[side.x][2][1] - params._projection[side.x][3][1]) / params._projection[side.x][1][1];
+    return vec3(Xe, Ye, Zeye);
 }
 
 in vec2 varTexCoord0;
@@ -44,37 +51,36 @@ vec2 tapLocation(int sampleNumber, float spinAngle, out float ssR){
     return vec2(cos(angle), sin(angle));
 }
 
-vec3 getOffsetPosition(ivec2 ssC, vec2 unitOffset, float ssR) {
+vec3 getOffsetPosition(ivec2 side, ivec2 ssC, vec2 unitOffset, float ssR) {
     // Derivation:
     //  mipLevel = floor(log(ssR / MAX_OFFSET));
     int mipLevel = clamp(findMSB(int(ssR)) - LOG_MAX_OFFSET, 0, MAX_MIP_LEVEL);
 
     ivec2 ssP = ivec2(ssR * unitOffset) + ssC;
+    ivec2 ssPFull = ivec2(ssP.x + side.y, ssP.y);
 
     vec3 P;
 
     // We need to divide by 2^mipLevel to read the appropriately scaled coordinate from a MIP-map.
     // Manually clamp to the texture size because texelFetch bypasses the texture unit
-    ivec2 mipP = clamp(ssP >> mipLevel, ivec2(0), textureSize(pyramidMap, mipLevel) - ivec2(1));
+    ivec2 mipP = clamp(ssPFull >> mipLevel, ivec2(0), textureSize(pyramidMap, mipLevel) - ivec2(1));
     P.z = -texelFetch(pyramidMap, mipP, mipLevel).r;
-//    P.z = -texelFetch(pyramidMap, ssP, 0).r;
+//    P.z = -texelFetch(pyramidMap, ssPFull, 0).r;
 
     // Offset to pixel center
-    //P = reconstructCSPosition(vec2(ssP) + vec2(0.5), P.z);
-
-    vec2 tapUV = (vec2(ssP) + vec2(0.5)) / getWidthHeight();
-    P = evalEyePositionFromZeye(P.z, tapUV);
+    vec2 tapUV = (vec2(ssP) + vec2(0.5)) / getStereoSideWidth();
+    P = evalEyePositionFromZeye(side, P.z, tapUV);
     return P;
 }
 
-float sampleAO(in ivec2 ssC, in vec3 C, in vec3 n_C, in float ssDiskRadius, in int tapIndex, in float randomPatternRotationAngle) {
+float sampleAO(in ivec2 side, in ivec2 ssC, in vec3 C, in vec3 n_C, in float ssDiskRadius, in int tapIndex, in float randomPatternRotationAngle) {
     // Offset on the unit disk, spun for this pixel
     float ssR;
     vec2 unitOffset = tapLocation(tapIndex, randomPatternRotationAngle, ssR);
     ssR *= ssDiskRadius;
 
     // The occluding point in camera space
-    vec3 Q = getOffsetPosition(ssC, unitOffset, ssR);
+    vec3 Q = getOffsetPosition(side, ssC, unitOffset, ssR);
 
     vec3 v = Q - C;
     float vv = dot(v, v);
@@ -84,11 +90,7 @@ float sampleAO(in ivec2 ssC, in vec3 C, in vec3 n_C, in float ssDiskRadius, in i
     const float epsilon = 0.01;
     float radius2 = getRadius2();
 
-    // A: From the HPG12 paper
-    // Note large epsilon to avoid overdarkening within cracks
-    // return float(vv < radius2) * max((vn - bias) / (epsilon + vv), 0.0) * radius2 * 0.6;
-
-    // B: Smoother transition to zero (lowers contrast, smoothing out corners). [Recommended]
+    // Fall off function as recommended in SAO paper
     float f = max(radius2 - vv, 0.0);
     return f * f * f * max((vn - bias) / (epsilon + vv), 0.0);
 }
@@ -105,19 +107,31 @@ void main(void) {
     // Pixel being shaded
     ivec2 ssC = ivec2(gl_FragCoord.xy);
 
-    vec3 Cp = evalEyePosition(varTexCoord0);
+    // Fetch the z under the pixel (stereo or not)
+    float Zeye = getZEye(ssC);
 
-    float randomPatternRotationAngle = getAngleDithering(ssC);
+    // Stereo side info
+    ivec2 side = getStereoSideInfo(ssC.x);
 
+    // From now on, ssC is the pixel pos in the side
+    ssC.x -= side.y;
+    vec2 fragPos = (vec2(ssC) + 0.5) / getStereoSideWidth();
+
+    // The position  and normal of the pixel fragment in Eye space
+    vec3 Cp = evalEyePositionFromZeye(side, Zeye, fragPos);
     vec3 Cn = evalEyeNormal(Cp);
 
     // Choose the screen-space sample radius
     // proportional to the projected area of the sphere
     float ssDiskRadius = -getProjScale() * getRadius() / Cp.z;
 
+    // Let's make noise 
+    float randomPatternRotationAngle = getAngleDithering(ssC);
+
+    // Accumulate the Obscurance for each samples
     float sum = 0.0;
     for (int i = 0; i < getNumSamples(); ++i) {
-        sum += sampleAO(ssC, Cp, Cn, ssDiskRadius, i, randomPatternRotationAngle);
+        sum += sampleAO(side, ssC, Cp, Cn, ssDiskRadius, i, randomPatternRotationAngle);
     }
 
     float A = max(0.0, 1.0 - sum * getObscuranceScaling() * 5.0 * getInvNumSamples());

libraries/render-utils/src/ssao_makePyramid.slf

@@ -12,14 +12,12 @@
 <@include ssao.slh@>
 <$declareAmbientOcclusion()$>
 
-// the depth texture
 uniform sampler2D depthMap;
 
-in vec2 varTexCoord0;
 out vec4 outFragColor;
 
 void main(void) {
-    float Zdb = texture(depthMap, varTexCoord0).x;
+    float Zdb = texelFetch(depthMap, ivec2(gl_FragCoord.xy), 0).x;
     float Zeye = -evalZeyeFromZdb(Zdb);
     outFragColor = vec4(Zeye, 0.0, 0.0, 1.0);
 }