void OVR_CalculateState(vr_param_t *state)
{
vr_param_t ovrState;
float ovrScale = vr_ovr_supersample->value;
int eye = 0;
for (eye = 0; eye < 2; eye++) {
ovrDistortionMesh meshData;
ovr_vert_t *mesh = NULL;
ovr_vert_t *v = NULL;
ovrDistortionVertex *ov = NULL;
unsigned int i = 0;
float vignette_factor;
if (vr_ovr_maxfov->value)
{
renderInfo[eye].eyeFov = hmd->MaxEyeFov[eye];
} else
{
renderInfo[eye].eyeFov = hmd->DefaultEyeFov[eye];
}
ovrState.eyeFBO[eye] = &renderInfo[eye].eyeFBO;
ovrState.renderParams[eye].projection.x.scale = 2.0f / ( renderInfo[eye].eyeFov.LeftTan + renderInfo[eye].eyeFov.RightTan );
ovrState.renderParams[eye].projection.x.offset = ( renderInfo[eye].eyeFov.LeftTan - renderInfo[eye].eyeFov.RightTan ) * ovrState.renderParams[eye].projection.x.scale * 0.5f;
ovrState.renderParams[eye].projection.y.scale = 2.0f / ( renderInfo[eye].eyeFov.UpTan + renderInfo[eye].eyeFov.DownTan );
ovrState.renderParams[eye].projection.y.offset = ( renderInfo[eye].eyeFov.UpTan - renderInfo[eye].eyeFov.DownTan ) * ovrState.renderParams[eye].projection.y.scale * 0.5f;
// set up rendering info
eyeDesc[eye] = ovrHmd_GetRenderDesc(hmd,(ovrEyeType) eye,renderInfo[eye].eyeFov);
VectorSet(ovrState.renderParams[eye].viewOffset,
-eyeDesc[eye].HmdToEyeViewOffset.x,
eyeDesc[eye].HmdToEyeViewOffset.y,
eyeDesc[eye].HmdToEyeViewOffset.z);
ovrHmd_CreateDistortionMesh(hmd, eyeDesc[eye].Eye, eyeDesc[eye].Fov, ovrDistortionCap_Chromatic | ovrDistortionCap_SRGB | ovrDistortionCap_TimeWarp | ovrDistortionCap_Vignette, &meshData);
mesh = (ovr_vert_t *) Z_TagMalloc(sizeof(ovr_vert_t) * meshData.VertexCount, TAG_RENDERER);
v = mesh;
ov = meshData.pVertexData;
for (i = 0; i < meshData.VertexCount; i++)
{
// DK2 display not rotated - rotate the coordinates manually
if (vid.width < vid.height) {
v->pos.x = -ov->ScreenPosNDC.y;
v->pos.y = ov->ScreenPosNDC.x;
} else {
v->pos.x = ov->ScreenPosNDC.x;
v->pos.y = ov->ScreenPosNDC.y;
}
v->texR = (*(ovrVector2f*)&ov->TanEyeAnglesR);
v->texG = (*(ovrVector2f*)&ov->TanEyeAnglesG);
v->texB = (*(ovrVector2f*)&ov->TanEyeAnglesB);
vignette_factor = ov->VignetteFactor;
if (vignette_factor < 0) vignette_factor = 0;
v->color[0] = v->color[1] = v->color[2] = (GLubyte)(vignette_factor * 255.99f);
v->color[3] = (GLubyte)( ov->TimeWarpFactor * 255.99f );
v++; ov++;
}
R_BindIVBO(&renderInfo[eye].eye,NULL,0);
R_VertexData(&renderInfo[eye].eye,sizeof(ovr_vert_t) * meshData.VertexCount, mesh);
R_IndexData(&renderInfo[eye].eye,GL_TRIANGLES,GL_UNSIGNED_SHORT,meshData.IndexCount,sizeof(uint16_t) * meshData.IndexCount,meshData.pIndexData);
R_ReleaseIVBO();
Z_Free(mesh);
ovrHmd_DestroyDistortionMesh( &meshData );
}
{
// calculate this to give the engine a rough idea of the fov
float combinedTanHalfFovHorizontal = max ( max ( renderInfo[0].eyeFov.LeftTan, renderInfo[0].eyeFov.RightTan ), max ( renderInfo[1].eyeFov.LeftTan, renderInfo[1].eyeFov.RightTan ) );
float combinedTanHalfFovVertical = max ( max ( renderInfo[0].eyeFov.UpTan, renderInfo[0].eyeFov.DownTan ), max ( renderInfo[1].eyeFov.UpTan, renderInfo[1].eyeFov.DownTan ) );
float horizontalFullFovInRadians = 2.0f * atanf ( combinedTanHalfFovHorizontal );
float fovX = RAD2DEG(horizontalFullFovInRadians);
float fovY = RAD2DEG(2.0 * atanf(combinedTanHalfFovVertical));
ovrState.aspect = combinedTanHalfFovHorizontal / combinedTanHalfFovVertical;
ovrState.viewFovY = fovY;
ovrState.viewFovX = fovX;
ovrState.pixelScale = ovrScale * vid.width / (float) hmd->Resolution.w;
}
*state = ovrState;
}
void R_VR_GenerateHud()
{
int i, j;
float numsegments = floor(vr_hud_segments->value);
float horizFOV = vr_hud_fov->value;
float depth = vr_hud_depth->value;
float horizInterval = 2.0 / numsegments;
float vertBounds = (float) hud.height / (float) hud.width;
float vertInterval = horizInterval * vertBounds;
int numindices = (numsegments) * (numsegments + 1) * 2 + (numsegments * 2);
int numverts = (numsegments) * (numsegments + 1) * 2;
vert_t *hudverts = NULL;
GLushort *indices = NULL;
uint32_t hudNumVerts = 0;
GLushort currIndex = 0;
uint32_t iboSize = sizeof(GLushort) * numindices;
uint32_t vboSize = sizeof(vert_t) * numverts;
// calculate coordinates for hud
float xoff = tanf(horizFOV * (M_PI / 180.0f) * 0.5) * (depth);
float zoff = depth * cosf(horizFOV * (M_PI / 180.0f) * 0.5);
vec3_t offsetScale;
VectorSet(offsetScale, xoff, xoff, zoff);
hudverts = (vert_t *) malloc(vboSize);
memset(hudverts, 0, vboSize);
indices = (GLushort *) malloc(iboSize);
memset(indices, 0, iboSize);
for (j = 0; j < numsegments; j++)
{
float ypos, ypos1;
qboolean verticalHalf = (j >= numsegments / 2);
ypos = j * vertInterval - vertBounds;
ypos1 = (j + 1) * vertInterval - vertBounds;
for (i = 0; i <= numsegments; i++)
{
float xpos;
vert_t vert1, vert2;
GLushort vertNum1, vertNum2;
qboolean horizontalHalf = (i >= (numsegments+1) / 2);
xpos = i * horizInterval - 1;
VectorSet(vert1.position, xpos, ypos, -1);
sphereProject(vert1.position, offsetScale, vert1.position);
vert1.texCoords[0] = (float) i / (float) (numsegments);
vert1.texCoords[1] = (float) j / (float) (numsegments);
VectorSet(vert2.position, xpos, ypos1, -1);
sphereProject(vert2.position, offsetScale, vert2.position);
vert2.texCoords[0] = (float) i / (float) (numsegments);
vert2.texCoords[1] = (float) (j + 1) / (float) (numsegments);
vertNum1 = hudNumVerts++;
vertNum2 = hudNumVerts++;
if (verticalHalf)
{
hudverts[vertNum2] = vert1;
hudverts[vertNum1] = vert2;
} else {
hudverts[vertNum1] = vert1;
hudverts[vertNum2] = vert2;
}
if (j > 0 && i == 0)
{
indices[currIndex++] = vertNum1;
}
indices[currIndex++] = vertNum1;
indices[currIndex++] = vertNum2;
if (i == numsegments && j < (numsegments - 1))
{
indices[currIndex++] = vertNum2;
}
}
}
R_BindIVBO(&hudVBO,NULL,0);
R_VertexData(&hudVBO,hudNumVerts * sizeof(vert_t),hudverts);
R_IndexData(&hudVBO,GL_TRIANGLE_STRIP,GL_UNSIGNED_SHORT,currIndex,currIndex * sizeof(GLushort),indices);
R_ReleaseIVBO();
free(hudverts);
free(indices);
}