gzdoom/src/gl/stereo3d/gl_stereo3d.cpp

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#include "gl/stereo3d/gl_stereo3d.h"
#include "vectors.h" // RAD2DEG
#include "doomtype.h" // M_PI
namespace s3d {
/* virtual */
void EyePose::GetProjection(float fov, float aspectRatio, float fovRatio, GLdouble m[4][4]) const
{
// Lifted from gl_scene.cpp FGLRenderer::SetProjection()
float fovy = 2 * RAD2DEG(atan(tan(DEG2RAD(fov) / 2) / fovRatio));
const double zNear = 5.0;
const double zFar = 65536.0;
double sine, cotangent, deltaZ;
double radians = fovy / 2 * M_PI / 180;
deltaZ = zFar - zNear;
sine = sin(radians);
if ((deltaZ == 0) || (sine == 0) || (aspectRatio == 0)) {
return;
}
cotangent = cos(radians) / sine;
memset(m, 0, 16*sizeof(GLdouble));
m[0][0] = cotangent / aspectRatio;
m[1][1] = cotangent;
m[2][2] = -(zFar + zNear) / deltaZ;
m[2][3] = -1;
m[3][2] = -2 * zNear * zFar / deltaZ;
m[3][3] = 0;
}
/* virtual */
Viewport EyePose::GetViewport(const Viewport& fullViewport) const
{
return fullViewport;
}
/* virtual */
void EyePose::GetViewShift(float yaw, float outViewShift[3]) const
{
// pass-through for Mono view
outViewShift[0] = 0;
outViewShift[1] = 0;
outViewShift[2] = 0;
}
Stereo3DMode::Stereo3DMode()
{
}
Stereo3DMode::~Stereo3DMode()
{
}
// Avoid static initialization order fiasco by declaring first Mode type (Mono) here in the
// same source file as Stereo3DMode::getCurrentMode()
// https://isocpp.org/wiki/faq/ctors#static-init-order
/* static */
const MonoView& MonoView::getInstance()
{
static MonoView instance;
return instance;
}
} /* namespace s3d */