tenfourfox/gfx/vr/gfxVR.cpp

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2017-04-19 07:56:45 +00:00
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <math.h>
#include "prlink.h"
#include "prmem.h"
#include "prenv.h"
#include "nsString.h"
#include "gfxPrefs.h"
#include "gfxVR.h"
#if defined(XP_WIN)
#include "gfxVROculus.h"
#endif
#if defined(XP_WIN) || defined(XP_MACOSX) || defined(XP_LINUX)
#include "gfxVROculus050.h"
#endif
#include "gfxVRCardboard.h"
#include "nsServiceManagerUtils.h"
#include "nsIScreenManager.h"
#include "mozilla/unused.h"
#include "mozilla/layers/Compositor.h"
#include "mozilla/layers/TextureHost.h"
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif
using namespace mozilla;
using namespace mozilla::gfx;
// Dummy nsIScreen implementation, for when we just need to specify a size
class FakeScreen : public nsIScreen
{
public:
explicit FakeScreen(const IntRect& aScreenRect)
: mScreenRect(aScreenRect)
{ }
NS_DECL_ISUPPORTS
NS_IMETHOD GetRect(int32_t *l, int32_t *t, int32_t *w, int32_t *h) override {
*l = mScreenRect.x;
*t = mScreenRect.y;
*w = mScreenRect.width;
*h = mScreenRect.height;
return NS_OK;
}
NS_IMETHOD GetAvailRect(int32_t *l, int32_t *t, int32_t *w, int32_t *h) override {
return GetRect(l, t, w, h);
}
NS_IMETHOD GetRectDisplayPix(int32_t *l, int32_t *t, int32_t *w, int32_t *h) override {
return GetRect(l, t, w, h);
}
NS_IMETHOD GetAvailRectDisplayPix(int32_t *l, int32_t *t, int32_t *w, int32_t *h) override {
return GetAvailRect(l, t, w, h);
}
NS_IMETHOD GetId(uint32_t* aId) override { *aId = (uint32_t)-1; return NS_OK; }
NS_IMETHOD GetPixelDepth(int32_t* aPixelDepth) override { *aPixelDepth = 24; return NS_OK; }
NS_IMETHOD GetColorDepth(int32_t* aColorDepth) override { *aColorDepth = 24; return NS_OK; }
NS_IMETHOD LockMinimumBrightness(uint32_t aBrightness) override { return NS_ERROR_NOT_AVAILABLE; }
NS_IMETHOD UnlockMinimumBrightness(uint32_t aBrightness) override { return NS_ERROR_NOT_AVAILABLE; }
NS_IMETHOD GetRotation(uint32_t* aRotation) override {
*aRotation = nsIScreen::ROTATION_0_DEG;
return NS_OK;
}
NS_IMETHOD SetRotation(uint32_t aRotation) override { return NS_ERROR_NOT_AVAILABLE; }
NS_IMETHOD GetContentsScaleFactor(double* aContentsScaleFactor) override {
*aContentsScaleFactor = 1.0;
return NS_OK;
}
protected:
virtual ~FakeScreen() {}
IntRect mScreenRect;
};
NS_IMPL_ISUPPORTS(FakeScreen, nsIScreen)
VRHMDInfo::VRHMDInfo(VRHMDType aType)
: mType(aType)
{
MOZ_COUNT_CTOR(VRHMDInfo);
mDeviceIndex = VRHMDManager::AllocateDeviceIndex();
mDeviceName.AssignLiteral("Unknown Device");
}
VRHMDManager::VRHMDManagerArray *VRHMDManager::sManagers = nullptr;
Atomic<uint32_t> VRHMDManager::sDeviceBase(0);
/* static */ void
VRHMDManager::ManagerInit()
{
if (sManagers)
return;
sManagers = new VRHMDManagerArray();
RefPtr<VRHMDManager> mgr;
// we'll only load the 0.5.0 oculus runtime if
// the >= 0.6.0 one failed to load; otherwise
// we might initialize oculus twice
bool useOculus050 = true;
Unused << useOculus050;
#if defined(XP_WIN)
mgr = new VRHMDManagerOculus();
if (mgr->PlatformInit()) {
useOculus050 = false;
sManagers->AppendElement(mgr);
}
#endif
#if defined(XP_WIN) || defined(XP_MACOSX) || defined(XP_LINUX)
if (useOculus050) {
mgr = new VRHMDManagerOculus050();
if (mgr->PlatformInit())
sManagers->AppendElement(mgr);
}
#endif
mgr = new VRHMDManagerCardboard();
if (mgr->PlatformInit())
sManagers->AppendElement(mgr);
}
/* static */ void
VRHMDManager::ManagerDestroy()
{
if (!sManagers)
return;
for (uint32_t i = 0; i < sManagers->Length(); ++i) {
(*sManagers)[i]->Destroy();
}
delete sManagers;
sManagers = nullptr;
}
/* static */ void
VRHMDManager::GetAllHMDs(nsTArray<RefPtr<VRHMDInfo>>& aHMDResult)
{
if (!sManagers)
return;
for (uint32_t i = 0; i < sManagers->Length(); ++i) {
(*sManagers)[i]->GetHMDs(aHMDResult);
}
}
/* static */ uint32_t
VRHMDManager::AllocateDeviceIndex()
{
return ++sDeviceBase;
}
/* static */ already_AddRefed<nsIScreen>
VRHMDManager::MakeFakeScreen(int32_t x, int32_t y, uint32_t width, uint32_t height)
{
nsCOMPtr<nsIScreen> screen = new FakeScreen(IntRect(x, y, width, height));
return screen.forget();
}
VRHMDRenderingSupport::RenderTargetSet::RenderTargetSet()
: currentRenderTarget(0)
{
}
VRHMDRenderingSupport::RenderTargetSet::~RenderTargetSet()
{
}
Matrix4x4
VRFieldOfView::ConstructProjectionMatrix(float zNear, float zFar, bool rightHanded)
{
float upTan = tan(upDegrees * M_PI / 180.0);
float downTan = tan(downDegrees * M_PI / 180.0);
float leftTan = tan(leftDegrees * M_PI / 180.0);
float rightTan = tan(rightDegrees * M_PI / 180.0);
float handednessScale = rightHanded ? -1.0 : 1.0;
float pxscale = 2.0f / (leftTan + rightTan);
float pxoffset = (leftTan - rightTan) * pxscale * 0.5;
float pyscale = 2.0f / (upTan + downTan);
float pyoffset = (upTan - downTan) * pyscale * 0.5;
Matrix4x4 mobj;
float *m = &mobj._11;
m[0*4+0] = pxscale;
m[2*4+0] = pxoffset * handednessScale;
m[1*4+1] = pyscale;
m[2*4+1] = -pyoffset * handednessScale;
m[2*4+2] = zFar / (zNear - zFar) * -handednessScale;
m[3*4+2] = (zFar * zNear) / (zNear - zFar);
m[2*4+3] = handednessScale;
m[3*4+3] = 0.0f;
return mobj;
}