void LLViewerCamera::calcProjection(const F32 far_distance) const
{
F32 fov_y, z_far, z_near, aspect, f;
fov_y = getView();
z_far = far_distance;
z_near = getNear();
aspect = getAspect();
f = 1/tan(fov_y*0.5f);
mProjectionMatrix.setZero();
mProjectionMatrix.mMatrix[0][0] = f/aspect;
mProjectionMatrix.mMatrix[1][1] = f;
mProjectionMatrix.mMatrix[2][2] = (z_far + z_near)/(z_near - z_far);
mProjectionMatrix.mMatrix[3][2] = (2*z_far*z_near)/(z_near - z_far);
mProjectionMatrix.mMatrix[2][3] = -1;
}
void LLViewerCamera::setPerspective(BOOL for_selection,
S32 x, S32 y_from_bot, S32 width, S32 height,
BOOL limit_select_distance,
F32 z_near, F32 z_far)
{
F32 fov_y, aspect;
fov_y = RAD_TO_DEG * getView();
BOOL z_default_near, z_default_far = FALSE;
if (z_far <= 0)
{
z_default_far = TRUE;
z_far = getFar();
}
if (z_near <= 0)
{
z_default_near = TRUE;
z_near = getNear();
}
aspect = getAspect();
// Load camera view matrix
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glh::matrix4f proj_mat;
if (for_selection)
{
// make a tiny little viewport
// anything drawn into this viewport will be "selected"
GLint viewport[4];
viewport[0] = gViewerWindow->getWorldViewRectRaw().mLeft;
viewport[1] = gViewerWindow->getWorldViewRectRaw().mBottom;
viewport[2] = gViewerWindow->getWorldViewRectRaw().getWidth();
viewport[3] = gViewerWindow->getWorldViewRectRaw().getHeight();
proj_mat = gl_pick_matrix(x+width/2.f, y_from_bot+height/2.f, (GLfloat) width, (GLfloat) height, viewport);
if (limit_select_distance)
{
// ...select distance from control
z_far = gSavedSettings.getF32("MaxSelectDistance");
}
else
{
z_far = gAgent.mDrawDistance;
}
}
else
{
// Only override the far clip if it's not passed in explicitly.
if (z_default_far)
{
z_far = MAX_FAR_CLIP;
}
glViewport(x, y_from_bot, width, height);
gGLViewport[0] = x;
gGLViewport[1] = y_from_bot;
gGLViewport[2] = width;
gGLViewport[3] = height;
}
if (mZoomFactor > 1.f)
{
float offset = mZoomFactor - 1.f;
int pos_y = mZoomSubregion / llceil(mZoomFactor);
int pos_x = mZoomSubregion - (pos_y*llceil(mZoomFactor));
glh::matrix4f translate;
translate.set_translate(glh::vec3f(offset - (F32)pos_x * 2.f, offset - (F32)pos_y * 2.f, 0.f));
glh::matrix4f scale;
scale.set_scale(glh::vec3f(mZoomFactor, mZoomFactor, 1.f));
proj_mat = scale*proj_mat;
proj_mat = translate*proj_mat;
}
calcProjection(z_far); // Update the projection matrix cache
proj_mat *= gl_perspective(fov_y,aspect,z_near,z_far);
glLoadMatrixf(proj_mat.m);
for (U32 i = 0; i < 16; i++)
{
gGLProjection[i] = proj_mat.m[i];
}
glMatrixMode( GL_MODELVIEW );
glh::matrix4f modelview((GLfloat*) OGL_TO_CFR_ROTATION);
GLfloat ogl_matrix[16];
getOpenGLTransform(ogl_matrix);
modelview *= glh::matrix4f(ogl_matrix);
glLoadMatrixf(modelview.m);
if (for_selection && (width > 1 || height > 1))
{
// NB: as of this writing, i believe the code below is broken (doesn't take into account the world view, assumes entire window)
// however, it is also unused (the GL matricies are used for selection, (see LLCamera::sphereInFrustum())) and so i'm not
// comfortable hacking on it.
calculateFrustumPlanesFromWindow((F32)(x - width / 2) / (F32)gViewerWindow->getWindowWidthScaled() - 0.5f,
(F32)(y_from_bot - height / 2) / (F32)gViewerWindow->getWindowHeightScaled() - 0.5f,
(F32)(x + width / 2) / (F32)gViewerWindow->getWindowWidthScaled() - 0.5f,
(F32)(y_from_bot + height / 2) / (F32)gViewerWindow->getWindowHeightScaled() - 0.5f);
}
// if not picking and not doing a snapshot, cache various GL matrices
if (!for_selection && mZoomFactor == 1.f)
{
// Save GL matrices for access elsewhere in code, especially project_world_to_screen
//glGetDoublev(GL_MODELVIEW_MATRIX, gGLModelView);
for (U32 i = 0; i < 16; i++)
{
gGLModelView[i] = modelview.m[i];
}
}
updateFrustumPlanes(*this);
/*if (gSavedSettings.getBOOL("CameraOffset"))
{
glMatrixMode(GL_PROJECTION);
glTranslatef(0,0,-50);
glRotatef(20.0,1,0,0);
glMatrixMode(GL_MODELVIEW);
}*/
}
void LLViewerCamera::calcProjection(const F32 far_distance) const
{
mProjectionMatrix = gGL.genPersp( getView()*RAD_TO_DEG, getAspect(), getNear(), far_distance );
}
void LLViewerCamera::setPerspective(BOOL for_selection,
S32 x, S32 y_from_bot, S32 width, S32 height,
BOOL limit_select_distance,
F32 z_near, F32 z_far)
{
F32 fov_y, aspect;
fov_y = RAD_TO_DEG * getView();
BOOL z_default_far = FALSE;
if (z_far <= 0)
{
z_default_far = TRUE;
z_far = getFar();
}
if (z_near <= 0)
{
z_near = getNear();
}
aspect = getAspect();
// Load camera view matrix
gGL.matrixMode( LLRender::MM_PROJECTION );
gGL.loadIdentity();
LLMatrix4a proj_mat;
proj_mat.setIdentity();
if (for_selection)
{
// make a tiny little viewport
// anything drawn into this viewport will be "selected"
const LLRect& rect = gViewerWindow->getWorldViewRectRaw();
const F32 scale_x = rect.getWidth() / F32(width);
const F32 scale_y = rect.getHeight() / F32(height);
const F32 trans_x = scale_x + (2.f * (rect.mLeft - x)) / F32(width) - 1.f;
const F32 trans_y = scale_y + (2.f * (rect.mBottom - y_from_bot)) / F32(height) - 1.f;
//Generate a pick matrix
proj_mat.applyScale_affine(scale_x, scale_y, 1.f);
proj_mat.setTranslate_affine(LLVector3(trans_x, trans_y, 0.f));
if (limit_select_distance)
{
// ...select distance from control
// z_far = gSavedSettings.getF32("MaxSelectDistance");
// [RLVa:KB] - Checked: 2010-04-11 (RLVa-1.2.0e) | Added: RLVa-1.2.0e
z_far = (!gRlvHandler.hasBehaviour(RLV_BHVR_FARTOUCH)) ? gSavedSettings.getF32("MaxSelectDistance") : 1.5;
// [/RLVa:KB]
}
else
{
z_far = gAgentCamera.mDrawDistance;
}
}
else
{
// Only override the far clip if it's not passed in explicitly.
if (z_default_far)
{
z_far = MAX_FAR_CLIP;
}
glViewport(x, y_from_bot, width, height);
gGLViewport[0] = x;
gGLViewport[1] = y_from_bot;
gGLViewport[2] = width;
gGLViewport[3] = height;
}
if (mZoomFactor > 1.f)
{
float offset = mZoomFactor - 1.f;
int pos_y = mZoomSubregion / llceil(mZoomFactor);
int pos_x = mZoomSubregion - (pos_y*llceil(mZoomFactor));
proj_mat.applyTranslation_affine(offset - (F32)pos_x * 2.f, offset - (F32)pos_y * 2.f, 0.f);
proj_mat.applyScale_affine(mZoomFactor,mZoomFactor,1.f);
}
calcProjection(z_far); // Update the projection matrix cache
proj_mat.mul(gGL.genPersp(fov_y,aspect,z_near,z_far));
gGL.loadMatrix(proj_mat);
gGLProjection = proj_mat;
gGL.matrixMode(LLRender::MM_MODELVIEW );
LLMatrix4a ogl_matrix;
getOpenGLTransform(ogl_matrix.getF32ptr());
LLMatrix4a modelview;
modelview.setMul(OGL_TO_CFR_ROTATION, ogl_matrix);
gGL.loadMatrix(modelview);
if (for_selection && (width > 1 || height > 1))
{
// NB: as of this writing, i believe the code below is broken (doesn't take into account the world view, assumes entire window)
// however, it is also unused (the GL matricies are used for selection, (see LLCamera::sphereInFrustum())) and so i'm not
// comfortable hacking on it.
calculateFrustumPlanesFromWindow((F32)(x - width / 2) / (F32)gViewerWindow->getWindowWidthScaled() - 0.5f,
(F32)(y_from_bot - height / 2) / (F32)gViewerWindow->getWindowHeightScaled() - 0.5f,
(F32)(x + width / 2) / (F32)gViewerWindow->getWindowWidthScaled() - 0.5f,
(F32)(y_from_bot + height / 2) / (F32)gViewerWindow->getWindowHeightScaled() - 0.5f);
}
// if not picking and not doing a snapshot, cache various GL matrices
if (!for_selection && mZoomFactor == 1.f)
{
// Save GL matrices for access elsewhere in code, especially project_world_to_screen
//glGetDoublev(GL_MODELVIEW_MATRIX, gGLModelView);
glh_set_current_modelview(modelview);
}
updateFrustumPlanes(*this);
/*if (gSavedSettings.getBOOL("CameraOffset"))
{
gGL.matrixMode(LLRender::MM_PROJECTION);
gGL.translatef(0,0,-50);
gGL.rotatef(20.0,1,0,0);
gGL.matrixMode(LLRender::MM_MODELVIEW);
}*/
}
void Frustum::generateFrustumPlanes( Camera* camera, Plane* frustum ) {
// Generate planes
float nearHeight = 2 * tan( getFOV() / 2 ) * getNear();
float nearWidth = nearHeight * getAspect();
//float farHeight = 2 * tan( getFOV() / 2 ) * getFar();
//float farWidth = farHeight * getAspect();
Vector3 fc, nc, tmp;
Vector3 ynh, xnw, X, Y, Z;
Z = Vector3( camera->getCenterOfProjection() );
Z.sub( Z, camera->getLookAtPoint() );
Z.normalize();
X.cross( camera->getUp(), Z );
X.normalize();
Y.cross( Z, X );
ynh = Vector3( Y );
ynh.scale( nearHeight / 2 );
xnw = Vector3( X );
xnw.scale( nearWidth / 2 );
tmp = Vector3( Z );
tmp.scale( getNear() );
nc = Vector3( camera->getCenterOfProjection() );
nc.sub( nc, tmp );
tmp = Vector3( Z );
tmp.scale( getFar() );
fc = Vector3( camera->getCenterOfProjection() );
fc.sub( fc, tmp );
Vector3 aux, normal;
frustum[ NEAR ].setNormal( Z.getX(), Z.getY(), Z.getZ() );
frustum[ NEAR ].setPoint( nc );
frustum[ FAR ].setNormal( -Z.getX(), -Z.getY(), -Z.getZ() );
frustum[ FAR ].setPoint( fc );
aux = Vector3( nc );
aux.add( aux, ynh );
frustum[ TOP ].setPoint( aux );
aux.sub( aux, camera->getCenterOfProjection() );
aux.normalize();
normal.cross( aux, X );
frustum[ TOP ].setNormal( normal.getX(), normal.getY(), normal.getZ() );
aux = Vector3( nc );
aux.sub( aux, ynh );
frustum[ BOTTOM ].setPoint( aux );
aux.sub( aux, camera->getCenterOfProjection() );
aux.normalize();
normal.cross( X, aux );
frustum[ BOTTOM ].setNormal( normal.getX(), normal.getY(), normal.getZ() );
aux = Vector3( nc );
aux.sub( aux, xnw );
frustum[ LEFT ].setPoint( aux );
aux.sub( aux, camera->getCenterOfProjection() );
aux.normalize();
normal.cross( aux, Y );
frustum[ LEFT ].setNormal( normal.getX(), normal.getY(), normal.getZ() );
aux = Vector3( nc );
aux.add( aux, xnw );
frustum[ RIGHT ].setPoint( aux );
aux.sub( aux, camera->getCenterOfProjection() );
aux.normalize();
normal.cross( Y, aux );
frustum[ RIGHT ].setNormal( normal.getX(), normal.getY(), normal.getZ() );
}
