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Fix distorted rendering on PSVR2. #134

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Fix distorted rendering on PSVR2. #134

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39 changes: 25 additions & 14 deletions L4D2VR/vr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -42,30 +42,41 @@ VR::VR(Game *game)
m_System = vr::OpenVRInternal_ModuleContext().VRSystem();

m_System->GetRecommendedRenderTargetSize(&m_RenderWidth, &m_RenderHeight);

float l_left = 0.0f, l_right = 0.0f, l_top = 0.0f, l_bottom = 0.0f;
m_System->GetProjectionRaw(vr::EVREye::Eye_Left, &l_left, &l_right, &l_top, &l_bottom);

float r_left = 0.0f, r_right = 0.0f, r_top = 0.0f, r_bottom = 0.0f;
m_System->GetProjectionRaw(vr::EVREye::Eye_Right, &r_left, &r_right, &r_top, &r_bottom);

float tanHalfFov[2];

tanHalfFov[0] = std::max({ -l_left, l_right, -r_left, r_right });
tanHalfFov[1] = std::max({ -l_top, l_bottom, -r_top, r_bottom });
if (m_RenderHeight > 0) {
m_Aspect = (float)m_RenderWidth / (float)m_RenderHeight;
}
else {
m_Aspect = 1.0f;
}

float tanHalfFovH = std::max({ -l_left, l_right, -r_left, r_right });
float tanHalfFovV = std::max({ -l_top, l_bottom, -r_top, r_bottom });

// For some headsets, the driver provided texture size doesn't match the geometric aspect ratio of the lenses.
// In this case, we need to adjust the vertical tangent while still rendering to the recommended RT size.

float idealAspect = tanHalfFovH / tanHalfFovV;
float adjustedTanHalfFovV = tanHalfFovH / m_Aspect;

m_TextureBounds[0].uMin = 0.5f + 0.5f * l_left / tanHalfFov[0];
m_TextureBounds[0].uMax = 0.5f + 0.5f * l_right / tanHalfFov[0];
m_TextureBounds[0].vMin = 0.5f - 0.5f * l_bottom / tanHalfFov[1];
m_TextureBounds[0].vMax = 0.5f - 0.5f * l_top / tanHalfFov[1];
m_Fov = 2.0f * atan(tanHalfFovH) * 360 / (3.14159265358979323846 * 2);

m_TextureBounds[1].uMin = 0.5f + 0.5f * r_left / tanHalfFov[0];
m_TextureBounds[1].uMax = 0.5f + 0.5f * r_right / tanHalfFov[0];
m_TextureBounds[1].vMin = 0.5f - 0.5f * r_bottom / tanHalfFov[1];
m_TextureBounds[1].vMax = 0.5f - 0.5f * r_top / tanHalfFov[1];
m_TextureBounds[0].uMin = 0.5f + 0.5f * l_left / tanHalfFovH;
m_TextureBounds[0].uMax = 0.5f + 0.5f * l_right / tanHalfFovH;
m_TextureBounds[0].vMin = 0.5f - 0.5f * l_bottom / adjustedTanHalfFovV;
m_TextureBounds[0].vMax = 0.5f - 0.5f * l_top / adjustedTanHalfFovV;

m_Aspect = tanHalfFov[0] / tanHalfFov[1];
m_Fov = 2.0f * atan(tanHalfFov[0]) * 360 / (3.14159265358979323846 * 2);
m_TextureBounds[1].uMin = 0.5f + 0.5f * r_left / tanHalfFovH;
m_TextureBounds[1].uMax = 0.5f + 0.5f * r_right / tanHalfFovH;
m_TextureBounds[1].vMin = 0.5f - 0.5f * r_bottom / adjustedTanHalfFovV;
m_TextureBounds[1].vMax = 0.5f - 0.5f * r_top / adjustedTanHalfFovV;

InstallApplicationManifest("manifest.vrmanifest");
SetActionManifest("action_manifest.json");
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