// I appreciate this is not an idea place for this function, but it didn't seem to be
// being linked properly when in OVR_CAPI.cpp.
// Please relocate if you know of a better place
ovrBool ovrHmd_CreateDistortionMeshInternal( ovrHmdStruct * hmd,
ovrEyeType eyeType, ovrFovPort fov,
unsigned int distortionCaps,
ovrDistortionMesh *meshData,
float overrideEyeReliefIfNonZero )
{
if (!meshData)
return 0;
HMDState* hmds = (HMDState*)hmd;
// Not used now, but Chromatic flag or others could possibly be checked for in the future.
OVR_UNUSED1(distortionCaps);
#if defined (OVR_CC_MSVC)
static_assert(sizeof(DistortionMeshVertexData) == sizeof(ovrDistortionVertex), "DistortionMeshVertexData size mismatch");
#endif
// *** Calculate a part of "StereoParams" needed for mesh generation
// Note that mesh distortion generation is invariant of RenderTarget UVs, allowing
// render target size and location to be changed after the fact dynamically.
// eyeToSourceUV is computed here for convenience, so that users don't need
// to call ovrHmd_GetRenderScaleAndOffset unless changing RT dynamically.
const HmdRenderInfo& hmdri = hmds->RenderState.RenderInfo;
StereoEye stereoEye = (eyeType == ovrEye_Left) ? StereoEye_Left : StereoEye_Right;
DistortionRenderDesc& distortion = hmds->RenderState.Distortion[eyeType];
if (overrideEyeReliefIfNonZero)
{
distortion.Lens = GenerateLensConfigFromEyeRelief(overrideEyeReliefIfNonZero,hmdri);
}
// Find the mapping from TanAngle space to target NDC space.
ScaleAndOffset2D eyeToSourceNDC = CreateNDCScaleAndOffsetFromFov(fov);
int triangleCount = 0;
int vertexCount = 0;
DistortionMeshCreate((DistortionMeshVertexData**)&meshData->pVertexData,
(uint16_t**)&meshData->pIndexData,
&vertexCount, &triangleCount,
(stereoEye == StereoEye_Right),
hmdri, distortion, eyeToSourceNDC);
if (meshData->pVertexData)
{
// Convert to index
meshData->IndexCount = triangleCount * 3;
meshData->VertexCount = vertexCount;
return 1;
}
return 0;
}
bool HMDState::CreateDistortionMesh(ovrEyeType eyeType, ovrFovPort fov,
unsigned int distortionCaps,
ovrDistortionMesh *meshData,
float overrideEyeReliefIfNonZero)
{
const HmdRenderInfo& hmdri = RenderState.RenderInfo;
DistortionRenderDesc& distortion = RenderState.Distortion[eyeType];
if (overrideEyeReliefIfNonZero)
{
distortion.Lens = GenerateLensConfigFromEyeRelief(overrideEyeReliefIfNonZero, hmdri);
}
if (CalculateDistortionMeshFromFOV(
hmdri, distortion,
(eyeType == ovrEye_Left ? StereoEye_Left : StereoEye_Right),
fov, distortionCaps, meshData))
{
return 1;
}
return 0;
}