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Fix culling calculations in HMD with new stereo mechanism

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This commit is contained in:
Brad Davis 2015-08-20 16:20:34 -07:00
parent 476e5edb32
commit cc037c8828
5 changed files with 24 additions and 2 deletions
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11
interface/src/Application.cpp
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@ -1118,7 +1118,16 @@ void Application::paintGL() {
renderArgs._viewport = gpu::Vec4i(0, 0, size.width(), size.height());
if (displayPlugin->isStereo()) {
//_myCamera.setProjection(displayPlugin->getProjection(Mono, _myCamera.getProjection()));
// Stereo modes will typically have a larger projection matrix overall,
// so we ask for the 'mono' projection matrix, which for stereo and HMD
// plugins will imply the combined projection for both eyes.
//
// This is properly implemented for the Oculus plugins, but for OpenVR
// and Stereo displays I'm not sure how to get / calculate it, so we're
// just relying on the left FOV in each case and hoping that the
// overall culling margin of error doesn't cause popping in the
// right eye. There are FIXMEs in the relevant plugins
_myCamera.setProjection(displayPlugin->getProjection(Mono, _myCamera.getProjection()));
renderArgs._context->enableStereo(true);
mat4 eyeViews[2];
mat4 eyeProjections[2];

7
libraries/display-plugins/src/display-plugins/oculus/OculusLegacyDisplayPlugin.cpp
View file

@ -136,6 +136,13 @@ void OculusLegacyDisplayPlugin::activate() {
_eyeOffsets[eye] = erd.HmdToEyeViewOffset;
eyeSizes[eye] = toGlm(ovrHmd_GetFovTextureSize(_hmd, eye, erd.Fov, 1.0f));
});
ovrFovPort combined = _eyeFovs[Left];
combined.LeftTan = std::max(_eyeFovs[Left].LeftTan, _eyeFovs[Right].LeftTan);
combined.RightTan = std::max(_eyeFovs[Left].RightTan, _eyeFovs[Right].RightTan);
ovrMatrix4f ovrPerspectiveProjection =
ovrMatrix4f_Projection(combined, DEFAULT_NEAR_CLIP, DEFAULT_FAR_CLIP, ovrProjection_RightHanded);
_eyeProjections[Mono] = toGlm(ovrPerspectiveProjection);
_desiredFramebufferSize = uvec2(
eyeSizes[0].x + eyeSizes[1].x,
std::max(eyeSizes[0].y, eyeSizes[1].y));

2
libraries/display-plugins/src/display-plugins/oculus/OculusLegacyDisplayPlugin.h
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@ -52,7 +52,7 @@ private:
ovrPosef _eyePoses[2];
ovrVector3f _eyeOffsets[2];
ovrFovPort _eyeFovs[2];
mat4 _eyeProjections[2];
mat4 _eyeProjections[3];
mat4 _compositeEyeProjections[2];
uvec2 _desiredFramebufferSize;
ovrTexture _eyeTextures[2];

4
libraries/display-plugins/src/display-plugins/openvr/OpenVrDisplayPlugin.cpp
View file

@ -149,6 +149,10 @@ uvec2 OpenVrDisplayPlugin::getRecommendedRenderSize() const {
}
mat4 OpenVrDisplayPlugin::getProjection(Eye eye, const mat4& baseProjection) const {
// FIXME hack to ensure that we don't crash trying to get the combined matrix
if (eye == Mono) {
eye = Left;
}
return _eyesData[eye]._projectionMatrix;
}

2
libraries/display-plugins/src/display-plugins/stereo/StereoDisplayPlugin.cpp
View file

@ -29,6 +29,8 @@ const float DEFAULT_IPD = 0.064f;
const float HALF_DEFAULT_IPD = DEFAULT_IPD / 2.0f;
glm::mat4 StereoDisplayPlugin::getProjection(Eye eye, const glm::mat4& baseProjection) const {
// FIXME check for mono eye and provide a combined matrix, needed for proper
// culling
// Refer to http://www.nvidia.com/content/gtc-2010/pdfs/2010_gtc2010.pdf on creating
// stereo projection matrices. Do NOT use "toe-in", use translation.