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80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
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#include "gl_stereo_leftright.h"
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#include "vectors.h" // RAD2DEG
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#include "doomtype.h" // M_PI
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#include "gl/system/gl_cvars.h"
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#include <cmath>
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EXTERN_CVAR(Float, vr_screendist)
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EXTERN_CVAR(Float, vr_hunits_per_meter)
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namespace s3d {
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/* virtual */
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void ShiftedEyePose::GetProjection(float fov, float aspectRatio, float fovRatio, GLdouble m[4][4]) const
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{
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// Lifted from gl_scene.cpp FGLRenderer::SetProjection()
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float fovy = 2 * RAD2DEG(atan(tan(DEG2RAD(fov) / 2) / fovRatio));
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double zNear = 5.0;
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double zFar = 65536.0;
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// For stereo 3D, use asymmetric frustum shift in projection matrix
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// Q: shouldn't shift vary with roll angle, at least for desktop display?
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// A: (lab) roll is not measured on desktop display (yet)
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double frustumShift = zNear * shift / vr_screendist; // meters cancel
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// double frustumShift = 0; // Turning off shift for debugging
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double fH = tan(fovy / 360 * M_PI) * zNear;
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double fW = fH * aspectRatio;
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// Emulate glFrustum command:
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// glFrustum(-fW - frustumShift, fW - frustumShift, -fH, fH, zNear, zFar);
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double left = -fW - frustumShift;
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double right = fW - frustumShift;
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double bottom = -fH;
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double top = fH;
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double deltaZ = zFar - zNear;
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memset(m, 0, 16 * sizeof(GLdouble)); // set all elements to zero, cleverly
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// https://www.opengl.org/sdk/docs/man2/xhtml/glFrustum.xml
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m[0][0] = 2 * zNear / (right - left);
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m[1][1] = 2 * zNear / (top - bottom);
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m[2][2] = -(zFar + zNear) / deltaZ;
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m[2][3] = -1;
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m[3][2] = -2 * zNear * zFar / deltaZ;
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// m[3][3] = 0; // redundant
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// m[2][1] = (top + bottom) / (top - bottom); // zero for the cases I know of...
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m[2][0] = (right + left) / (right - left); // asymmetric shift is in this term
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}
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/* virtual */
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void ShiftedEyePose::GetViewShift(float yaw, float outViewShift[3]) const
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{
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float dx = cos(DEG2RAD(yaw)) * vr_hunits_per_meter * shift;
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float dy = sin(DEG2RAD(yaw)) * vr_hunits_per_meter * shift;
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outViewShift[0] = dx;
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outViewShift[1] = dy;
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outViewShift[2] = 0;
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}
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/* static */
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const LeftEyeView& LeftEyeView::getInstance(float ipd)
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{
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static LeftEyeView instance(ipd);
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instance.setIpd(ipd);
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return instance;
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}
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/* static */
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const RightEyeView& RightEyeView::getInstance(float ipd)
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{
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static RightEyeView instance(ipd);
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instance.setIpd(ipd);
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return instance;
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}
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} /* namespace s3d */
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