| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "modules/vr/VRFrameData.h" |
| |
| #include "modules/vr/VREyeParameters.h" |
| #include "modules/vr/VRPose.h" |
| |
| #include <cmath> |
| |
| namespace blink { |
| |
| // TODO(bajones): All of the matrix math here is temporary. It will be removed |
| // once the VRService has been updated to allow the underlying VR APIs to |
| // provide the projection and view matrices directly. |
| |
| // Build a projection matrix from a field of view and near/far planes. |
| void projectionFromFieldOfView(DOMFloat32Array* outArray, |
| VRFieldOfView* fov, |
| float depthNear, |
| float depthFar) { |
| float upTan = tanf(fov->upDegrees() * M_PI / 180.0); |
| float downTan = tanf(fov->downDegrees() * M_PI / 180.0); |
| float leftTan = tanf(fov->leftDegrees() * M_PI / 180.0); |
| float rightTan = tanf(fov->rightDegrees() * M_PI / 180.0); |
| float xScale = 2.0f / (leftTan + rightTan); |
| float yScale = 2.0f / (upTan + downTan); |
| |
| float* out = outArray->data(); |
| out[0] = xScale; |
| out[1] = 0.0f; |
| out[2] = 0.0f; |
| out[3] = 0.0f; |
| out[4] = 0.0f; |
| out[5] = yScale; |
| out[6] = 0.0f; |
| out[7] = 0.0f; |
| out[8] = -((leftTan - rightTan) * xScale * 0.5); |
| out[9] = ((upTan - downTan) * yScale * 0.5); |
| out[10] = (depthNear + depthFar) / (depthNear - depthFar); |
| out[11] = -1.0f; |
| out[12] = 0.0f; |
| out[13] = 0.0f; |
| out[14] = (2 * depthFar * depthNear) / (depthNear - depthFar); |
| out[15] = 0.0f; |
| } |
| |
| // Create a matrix from a rotation and translation. |
| void matrixfromRotationTranslation(DOMFloat32Array* outArray, |
| const mojo::WTFArray<float>& rotation, |
| const mojo::WTFArray<float>& translation) { |
| // Quaternion math |
| float x = rotation.is_null() ? 0.0f : rotation[0]; |
| float y = rotation.is_null() ? 0.0f : rotation[1]; |
| float z = rotation.is_null() ? 0.0f : rotation[2]; |
| float w = rotation.is_null() ? 1.0f : rotation[3]; |
| float x2 = x + x; |
| float y2 = y + y; |
| float z2 = z + z; |
| |
| float xx = x * x2; |
| float xy = x * y2; |
| float xz = x * z2; |
| float yy = y * y2; |
| float yz = y * z2; |
| float zz = z * z2; |
| float wx = w * x2; |
| float wy = w * y2; |
| float wz = w * z2; |
| |
| float* out = outArray->data(); |
| out[0] = 1 - (yy + zz); |
| out[1] = xy + wz; |
| out[2] = xz - wy; |
| out[3] = 0; |
| out[4] = xy - wz; |
| out[5] = 1 - (xx + zz); |
| out[6] = yz + wx; |
| out[7] = 0; |
| out[8] = xz + wy; |
| out[9] = yz - wx; |
| out[10] = 1 - (xx + yy); |
| out[11] = 0; |
| out[12] = translation.is_null() ? 0.0f : translation[0]; |
| out[13] = translation.is_null() ? 0.0f : translation[1]; |
| out[14] = translation.is_null() ? 0.0f : translation[2]; |
| out[15] = 1; |
| } |
| |
| // Translate a matrix |
| void matrixTranslate(DOMFloat32Array* outArray, |
| const DOMFloat32Array* translation) { |
| if (!translation) |
| return; |
| |
| float x = translation->data()[0]; |
| float y = translation->data()[1]; |
| float z = translation->data()[2]; |
| |
| float* out = outArray->data(); |
| out[12] = out[0] * x + out[4] * y + out[8] * z + out[12]; |
| out[13] = out[1] * x + out[5] * y + out[9] * z + out[13]; |
| out[14] = out[2] * x + out[6] * y + out[10] * z + out[14]; |
| out[15] = out[3] * x + out[7] * y + out[11] * z + out[15]; |
| } |
| |
| bool matrixInvert(DOMFloat32Array* outArray) { |
| float* out = outArray->data(); |
| float a00 = out[0]; |
| float a01 = out[1]; |
| float a02 = out[2]; |
| float a03 = out[3]; |
| float a10 = out[4]; |
| float a11 = out[5]; |
| float a12 = out[6]; |
| float a13 = out[7]; |
| float a20 = out[8]; |
| float a21 = out[9]; |
| float a22 = out[10]; |
| float a23 = out[11]; |
| float a30 = out[12]; |
| float a31 = out[13]; |
| float a32 = out[14]; |
| float a33 = out[15]; |
| |
| float b00 = a00 * a11 - a01 * a10; |
| float b01 = a00 * a12 - a02 * a10; |
| float b02 = a00 * a13 - a03 * a10; |
| float b03 = a01 * a12 - a02 * a11; |
| float b04 = a01 * a13 - a03 * a11; |
| float b05 = a02 * a13 - a03 * a12; |
| float b06 = a20 * a31 - a21 * a30; |
| float b07 = a20 * a32 - a22 * a30; |
| float b08 = a20 * a33 - a23 * a30; |
| float b09 = a21 * a32 - a22 * a31; |
| float b10 = a21 * a33 - a23 * a31; |
| float b11 = a22 * a33 - a23 * a32; |
| |
| // Calculate the determinant |
| float det = |
| b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06; |
| |
| if (!det) |
| return false; |
| |
| det = 1.0 / det; |
| |
| out[0] = (a11 * b11 - a12 * b10 + a13 * b09) * det; |
| out[1] = (a02 * b10 - a01 * b11 - a03 * b09) * det; |
| out[2] = (a31 * b05 - a32 * b04 + a33 * b03) * det; |
| out[3] = (a22 * b04 - a21 * b05 - a23 * b03) * det; |
| out[4] = (a12 * b08 - a10 * b11 - a13 * b07) * det; |
| out[5] = (a00 * b11 - a02 * b08 + a03 * b07) * det; |
| out[6] = (a32 * b02 - a30 * b05 - a33 * b01) * det; |
| out[7] = (a20 * b05 - a22 * b02 + a23 * b01) * det; |
| out[8] = (a10 * b10 - a11 * b08 + a13 * b06) * det; |
| out[9] = (a01 * b08 - a00 * b10 - a03 * b06) * det; |
| out[10] = (a30 * b04 - a31 * b02 + a33 * b00) * det; |
| out[11] = (a21 * b02 - a20 * b04 - a23 * b00) * det; |
| out[12] = (a11 * b07 - a10 * b09 - a12 * b06) * det; |
| out[13] = (a00 * b09 - a01 * b07 + a02 * b06) * det; |
| out[14] = (a31 * b01 - a30 * b03 - a32 * b00) * det; |
| out[15] = (a20 * b03 - a21 * b01 + a22 * b00) * det; |
| |
| return true; |
| }; |
| |
| VRFrameData::VRFrameData() : m_timestamp(0.0) { |
| m_leftProjectionMatrix = DOMFloat32Array::create(16); |
| m_leftViewMatrix = DOMFloat32Array::create(16); |
| m_rightProjectionMatrix = DOMFloat32Array::create(16); |
| m_rightViewMatrix = DOMFloat32Array::create(16); |
| m_pose = VRPose::create(); |
| } |
| |
| bool VRFrameData::update(const device::blink::VRPosePtr& pose, |
| VREyeParameters* leftEye, |
| VREyeParameters* rightEye, |
| float depthNear, |
| float depthFar) { |
| if (!pose) |
| return false; |
| |
| m_timestamp = pose->timestamp; |
| |
| // Build the projection matrices |
| projectionFromFieldOfView(m_leftProjectionMatrix, leftEye->fieldOfView(), |
| depthNear, depthFar); |
| projectionFromFieldOfView(m_rightProjectionMatrix, rightEye->fieldOfView(), |
| depthNear, depthFar); |
| |
| // Build the view matrices |
| matrixfromRotationTranslation(m_leftViewMatrix, pose->orientation, |
| pose->position); |
| matrixTranslate(m_leftViewMatrix, leftEye->offset()); |
| if (!matrixInvert(m_leftViewMatrix)) |
| return false; |
| |
| matrixfromRotationTranslation(m_rightViewMatrix, pose->orientation, |
| pose->position); |
| matrixTranslate(m_rightViewMatrix, rightEye->offset()); |
| if (!matrixInvert(m_rightViewMatrix)) |
| return false; |
| |
| // Set the pose |
| m_pose->setPose(pose); |
| |
| return true; |
| } |
| |
| DEFINE_TRACE(VRFrameData) { |
| visitor->trace(m_leftProjectionMatrix); |
| visitor->trace(m_leftViewMatrix); |
| visitor->trace(m_rightProjectionMatrix); |
| visitor->trace(m_rightViewMatrix); |
| visitor->trace(m_pose); |
| } |
| |
| } // namespace blink |