/** {@inheritDoc} */
public double limitZoom(View view, double value)
{
if (view == null)
{
String message = Logging.getMessage("nullValue.ViewIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
double minZoom = this.minZoom;
double maxZoom = this.maxZoom;
if (this.is2DGlobe(view.getGlobe())) // limit zoom to ~360 degrees of visible longitude on 2D globes
{
double max2DZoom = Math.PI * view.getGlobe().getEquatorialRadius() / view.getFieldOfView().tanHalfAngle();
if (minZoom > max2DZoom)
{
minZoom = max2DZoom;
}
if (maxZoom > max2DZoom)
{
maxZoom = max2DZoom;
}
}
return(WWMath.clamp(value, minZoom, maxZoom));
}
/**
* Returns the linear interpolation of <code>value1</code> and <code>value2</code>, treating the geographic
* locations as simple 2D coordinate pairs, and treating the elevation values as 1D scalars.
*
* @param amount the interpolation factor
* @param value1 the first position.
* @param value2 the second position.
*
* @return the linear interpolation of <code>value1</code> and <code>value2</code>.
*
* @throws ArgumentException if either position is null.
*/
public static Position interpolate(double amount, Position value1, Position value2)
{
if (value1 == null || value2 == null)
{
String message = Logging.getMessage("nullValue.PositionIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (amount < 0)
{
return(value1);
}
else if (amount > 1)
{
return(value2);
}
LatLon latLon = LatLon.interpolate(amount, value1, value2);
// Elevation is independent of geographic interpolation method (i.e. rhumb, great-circle, linear), so we
// interpolate elevation linearly.
double elevation = WWMath.mix(amount, value1.getElevation(), value2.getElevation());
return(new Position(latLon, elevation));
}
/** {@inheritDoc} */
public double getProjectedArea(View view)
{
if (view == null)
{
string message = Logging.getMessage("nullValue.ViewIsNull");
Logging.logger().severe(message);
throw new ArgumentNullException(message);
}
return(WWMath.computeSphereProjectedArea(view, this.getCenter(), this.getRadius()));
}
/** {@inheritDoc} */
public bool intersects(Line line)
{
if (line == null)
{
String message = Logging.getMessage("nullValue.LineIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
return(WWMath.polytopeIntersect(line, this.planes) != null);
}
/** {@inheritDoc} */
public double getProjectedArea(View view)
{
if (view == null)
{
String message = Logging.getMessage("nullValue.ViewIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
// TODO: compute a more exact projected screen area for Cylinder.
return(WWMath.computeSphereProjectedArea(view, this.getCenter(), this.getRadius()));
}
protected BufferedImageRaster chooseRasterForCanvas(BufferedImageRaster canvas)
{
int level = this.computeMipmapLevel(
this.getWidth(), this.getHeight(), this.getSector(),
canvas.getWidth(), canvas.getHeight(), canvas.getSector());
int maxLevel = this.levelRasters.length - 1;
level = (int)WWMath.clamp(level, 0, maxLevel);
return(this.levelRasters[level]);
}
protected Texture initializeTexture(DrawContext dc)
{
// The frame buffer can be used only during pre-rendering.
if (!dc.isPreRenderMode())
{
return(null);
}
// Bind actually binds the source texture only if the image source is available, otherwise it initiates image
// source retrieval. If bind returns false, the image source is not yet available.
if (this.sourceTexture == null || !this.sourceTexture.bind(dc))
{
return(null);
}
// Ensure that the source texture size is available so that the FBO can be sized to match the source image.
if (this.sourceTexture.getWidth(dc) < 1 || this.sourceTexture.getHeight(dc) < 1)
{
return(null);
}
int potSourceWidth = WWMath.powerOfTwoCeiling(this.sourceTexture.getWidth(dc));
int potSourceHeight = WWMath.powerOfTwoCeiling(this.sourceTexture.getHeight(dc));
this.width = Math.Min(potSourceWidth, dc.getView().getViewport().width);
this.height = Math.Min(potSourceHeight, dc.getView().getViewport().height);
if (!this.generateTexture(dc, this.width, this.height))
{
return(null);
}
GL gl = dc.getGL();
TextureData td = new TextureData(gl.getGLProfile(), GL.GL_RGBA, this.width, this.height, 0, GL.GL_RGBA,
GL.GL_UNSIGNED_BYTE, false, false, false, null, null);
Texture t = TextureIO.newTexture(td);
t.bind(gl); // must do this after generating texture because another texture is bound then
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
gl.glCopyTexImage2D(GL.GL_TEXTURE_2D, 0, td.getInternalFormat(), 0, 0, td.getWidth(), td.getHeight(),
td.getBorder());
dc.getTextureCache().put(this, t);
return(t);
}
protected int computeMipmapLevel(int sourceWidth, int sourceHeight, Sector sourceSector,
int destWidth, int destHeight, Sector destSector)
{
double sy = ((double)sourceHeight / (double)destHeight)
* (destSector.getDeltaLatDegrees() / sourceSector.getDeltaLatDegrees());
double sx = ((double)sourceWidth / (double)destWidth)
* (destSector.getDeltaLonDegrees() / sourceSector.getDeltaLonDegrees());
double scale = Math.Max(sx, sy);
if (scale < 1)
{
return(0);
}
return((int)WWMath.LogBase2(scale));
}
/** {@inheritDoc} */
public Position limitCenterPosition(View view, Position position)
{
if (view == null)
{
String message = Logging.getMessage("nullValue.ViewIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (position == null)
{
String message = Logging.getMessage("nullValue.PositionIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
Sector sector = this.centerLocationLimits;
Angle lat = Angle.clamp(position.latitude, sector.getMinLatitude(), sector.getMaxLatitude());
Angle lon = Angle.clamp(position.longitude, sector.getMinLongitude(), sector.getMaxLongitude());
double alt = WWMath.clamp(position.elevation, this.minCenterElevation, this.maxCenterElevation);
return(new Position(lat, lon, alt));
}
/**
* Computes a <code>Box</code> that bounds a specified buffer of points. Principal axes are computed for the points
* and used to form a <code>Box</code>.
* <p/>
* The buffer must contain XYZ coordinate tuples which are either tightly packed or offset by the specified stride.
* The stride specifies the number of buffer elements between the first coordinate of consecutive tuples. For
* example, a stride of 3 specifies that each tuple is tightly packed as XYZXYZXYZ, whereas a stride of 5 specifies
* that there are two elements between each tuple as XYZabXYZab (the elements "a" and "b" are ignored). The stride
* must be at least 3. If the buffer's length is not evenly divisible into stride-sized tuples, this ignores the
* remaining elements that follow the last complete tuple.
*
* @param coordinates the buffer containing the point coordinates for which to compute a bounding volume.
* @param stride the number of elements between the first coordinate of consecutive points. If stride is 3,
* this interprets the buffer has having tightly packed XYZ coordinate tuples.
*
* @return the bounding volume, with axes lengths consistent with the conventions described in the <code>Box</code>
* class overview.
*
* @throws ArgumentException if the buffer is null or empty, or if the stride is less than three.
*/
public static Box computeBoundingBox(BufferWrapper coordinates, int stride)
{
if (coordinates == null)
{
String msg = Logging.getMessage("nullValue.CoordinatesAreNull");
Logging.logger().severe(msg);
throw new ArgumentException(msg);
}
if (stride < 3)
{
String msg = Logging.getMessage("generic.StrideIsInvalid", stride);
Logging.logger().severe(msg);
throw new ArgumentException(msg);
}
Vec4[] axes = WWMath.computePrincipalAxes(coordinates, stride);
if (axes == null)
{
String msg = Logging.getMessage("generic.ListIsEmpty");
Logging.logger().severe(msg);
throw new ArgumentException(msg);
}
Vec4 r = axes[0];
Vec4 s = axes[1];
Vec4 t = axes[2];
// Find the extremes along each axis.
double minDotR = Double.MaxValue;
double maxDotR = -minDotR;
double minDotS = Double.MaxValue;
double maxDotS = -minDotS;
double minDotT = Double.MaxValue;
double maxDotT = -minDotT;
for (int i = 0; i <= coordinates.length() - stride; i += stride)
{
double x = coordinates.getDouble(i);
double y = coordinates.getDouble(i + 1);
double z = coordinates.getDouble(i + 2);
double pdr = x * r.x() + y * r.y() + z * r.z();
if (pdr < minDotR)
{
minDotR = pdr;
}
if (pdr > maxDotR)
{
maxDotR = pdr;
}
double pds = x * s.x() + y * s.y() + z * s.z();
if (pds < minDotS)
{
minDotS = pds;
}
if (pds > maxDotS)
{
maxDotS = pds;
}
double pdt = x * t.x() + y * t.y() + z * t.z();
if (pdt < minDotT)
{
minDotT = pdt;
}
if (pdt > maxDotT)
{
maxDotT = pdt;
}
}
if (maxDotR == minDotR)
{
maxDotR = minDotR + 1;
}
if (maxDotS == minDotS)
{
maxDotS = minDotS + 1;
}
if (maxDotT == minDotT)
{
maxDotT = minDotT + 1;
}
return(new Box(axes, minDotR, maxDotR, minDotS, maxDotS, minDotT, maxDotT));
}
/**
* Compute a bounding cylinder for a collection of points.
*
* @param points the points to compute a bounding cylinder for.
*
* @return a cylinder bounding all the points. The axis of the cylinder is the longest principal axis of the
* collection. (See {@link WWMath#computePrincipalAxes(Iterable)}.
*
* @throws ArgumentException if the point list is null or empty.
* @see #computeVerticalBoundingCylinder(gov.nasa.worldwind.globes.Globe, double, Sector)
*/
public static Cylinder computeBoundingCylinder(IEnumerable <Vec4> points)
{
if (points == null)
{
String message = Logging.getMessage("nullValue.PointListIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
Vec4[] axes = WWMath.computePrincipalAxes(points);
if (axes == null)
{
String message = Logging.getMessage("generic.ListIsEmpty");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
Vec4 r = axes[0];
Vec4 s = axes[1];
List <Vec4> sPlanePoints = new List <Vec4>();
double minDotR = Double.MaxValue;
double maxDotR = -minDotR;
foreach (Vec4 p in points)
{
double pdr = p.dot3(r);
sPlanePoints.Add(p.subtract3(r.multiply3(p.dot3(r))));
if (pdr < minDotR)
{
minDotR = pdr;
}
if (pdr > maxDotR)
{
maxDotR = pdr;
}
}
Vec4 minPoint = sPlanePoints[0];
Vec4 maxPoint = minPoint;
double minDotS = Double.MaxValue;
double maxDotS = -minDotS;
foreach (Vec4 p in sPlanePoints)
{
double d = p.dot3(s);
if (d < minDotS)
{
minPoint = p;
minDotS = d;
}
if (d > maxDotS)
{
maxPoint = p;
maxDotS = d;
}
}
Vec4 center = minPoint.add3(maxPoint).divide3(2);
double radius = center.distanceTo3(minPoint);
foreach (Vec4 h in sPlanePoints)
{
Vec4 hq = h.subtract3(center);
double d = hq.getLength3();
if (d > radius)
{
Vec4 g = center.subtract3(hq.normalize3().multiply3(radius));
center = g.add3(h).divide3(2);
radius = d;
}
}
Vec4 bottomCenter = center.add3(r.multiply3(minDotR));
Vec4 topCenter = center.add3((r.multiply3(maxDotR)));
if (radius == 0)
{
radius = 1;
}
if (bottomCenter.Equals(topCenter))
{
topCenter = bottomCenter.add3(new Vec4(1, 0, 0));
}
return(new Cylinder(bottomCenter, topCenter, radius));
}
/**
* Returns a cylinder that minimally surrounds the specified height range in the sector.
*
* @param globe The globe associated with the sector.
* @param sector the sector to return the bounding cylinder for.
* @param minHeight the minimum height to include in the bounding cylinder.
* @param maxHeight the maximum height to include in the bounding cylinder.
*
* @return The minimal bounding cylinder in Cartesian coordinates.
*
* @throws ArgumentException if <code>sector</code> is null
*/
protected static Cylinder computeVerticalBoundsFromSectorQuadrilateral(Globe globe, Sector sector, double minHeight,
double maxHeight)
{
if (sector == null)
{
String msg = Logging.getMessage("nullValue.SectorIsNull");
Logging.logger().severe(msg);
throw new ArgumentException(msg);
}
// Get three non-coincident points on the sector's quadrilateral. We choose the north or south pair that is
// closest to the equator, then choose a third point from the opposite pair. We use maxHeight as elevation
// because we want to bound the largest potential quadrilateral for the sector.
Vec4 p0, p1, p2;
if (Math.Abs(sector.getMinLatitude().degrees) <= Math.Abs(sector.getMaxLatitude().degrees))
{
p0 = globe.computePointFromPosition(sector.getMinLatitude(), sector.getMaxLongitude(), maxHeight); // SE
p1 = globe.computePointFromPosition(sector.getMinLatitude(), sector.getMinLongitude(), maxHeight); // SW
p2 = globe.computePointFromPosition(sector.getMaxLatitude(), sector.getMinLongitude(), maxHeight); // NW
}
else
{
p0 = globe.computePointFromPosition(sector.getMaxLatitude(), sector.getMinLongitude(), maxHeight); // NW
p1 = globe.computePointFromPosition(sector.getMaxLatitude(), sector.getMaxLongitude(), maxHeight); // NE
p2 = globe.computePointFromPosition(sector.getMinLatitude(), sector.getMinLongitude(), maxHeight); // SW
}
// Compute the center, axis, and radius of the circle that circumscribes the three points.
// This circle is guaranteed to circumscribe all four points of the sector's Cartesian quadrilateral.
Vec4[] centerOut = new Vec4[1];
Vec4[] axisOut = new Vec4[1];
double[] radiusOut = new double[1];
if (!WWMath.computeCircleThroughPoints(p0, p1, p2, centerOut, axisOut, radiusOut))
{
// If the computation failed, then two of the points are coincident. Fall back to creating a bounding
// cylinder based on the vertices of the sector. This bounding cylinder won't be as tight a fit, but
// it will be correct.
return(computeVerticalBoundsFromSectorVertices(globe, sector, minHeight, maxHeight));
}
Vec4 centerPoint = centerOut[0];
Vec4 axis = axisOut[0];
double radius = radiusOut[0];
// Compute the sector's lowest projection along the cylinder axis. We test opposite corners of the sector
// using minHeight. One of these will be the lowest point in the sector.
Vec4 extremePoint = globe.computePointFromPosition(sector.getMinLatitude(), sector.getMinLongitude(),
minHeight);
double minProj = extremePoint.subtract3(centerPoint).dot3(axis);
extremePoint = globe.computePointFromPosition(sector.getMaxLatitude(), sector.getMaxLongitude(), minHeight);
minProj = Math.Min(minProj, extremePoint.subtract3(centerPoint).dot3(axis));
// Compute the sector's highest projection along the cylinder axis. We only need to use the point at the
// sector's centroid with maxHeight. This point is guaranteed to be the highest point in the sector.
LatLon centroid = sector.getCentroid();
extremePoint = globe.computePointFromPosition(centroid.getLatitude(), centroid.getLongitude(), maxHeight);
double maxProj = extremePoint.subtract3(centerPoint).dot3(axis);
Vec4 bottomCenterPoint = axis.multiply3(minProj).add3(centerPoint);
Vec4 topCenterPoint = axis.multiply3(maxProj).add3(centerPoint);
if (radius == 0)
{
radius = 1;
}
if (bottomCenterPoint.Equals(topCenterPoint))
{
topCenterPoint = bottomCenterPoint.add3(new Vec4(1, 0, 0));
}
return(new Cylinder(bottomCenterPoint, topCenterPoint, radius));
}
protected static int getInitialCapacity(int capacity, float loadFactor)
{
return(WWMath.powerOfTwoCeiling((int)Math.Ceiling(capacity / loadFactor)));
}
/** {@inheritDoc} */
public double getProjectedArea(View view)
{
if (view == null)
{
String message = Logging.getMessage("nullValue.ViewIsNull");
Logging.logger().severe(message);
throw new ArgumentException(message);
}
// Implementation based on "Real-time Bounding Box Area Computation" by Dieter Schmalstieg and Robert F. Tobler,
// Vienna University of Technology:
// http://jgt.akpeters.com/papers/SchmalstiegTobler99/
// Compute the exact area of this Box in the screen by determining exact area covered by this Box's projected
// vertices. We avoid computing a 2D bounding box of the projected vertices, because it is not necessarily more
// efficient and is is less accurate: it is an approximation of an approximation. We start by computing the 2D
// hull of this Box's vertices in screen coordinates. We create a 6-bit index into a predetermined table of
// possible vertex combinations by comparing the eye point to each of the six planes. The resultant index
// determines the vertices that define the 2D hull for that viewport.
int lookupCode = this.computeProjectionHullCode(view);
// Index 0 indicates that the view is inside this Box. Return positive infinity, indicating that this Box does
// not have a finite area in the viewport.
if (lookupCode == 0)
{
return(Double.PositiveInfinity);
}
if (lookupCode < 0 || lookupCode >= ProjectionHullTable.Length)
{
return(0); // This should never happen, but we check anyway.
}
// Get the 4 or 6 vertex indices that define this Box's convex hull in screen coordinates. Each element is used
// as an index into this Box's array of corners.
int[] indices = ProjectionHullTable[lookupCode];
if (indices == null || (indices.Length != 4 && indices.Length != 6))
{
return(0); // This should never happen, but we check anyway.
}
// Compute this Box's convex hull in screen coordinates, by transforming the 4 or 6 vertices that define its
// projected outline from model coordinates into screen coordinates.
Vec4[] vertices = this.getCorners();
Vec4[] screenVertices = new Vec4[indices.Length];
// If any of this Box's vertices are behind the eye point, return positive infinity indicating that this Box
// does not have a finite area in the viewport.
//noinspection ForLoopReplaceableByForEach
for (int i = 0; i < indices.Length; i++)
{
Vec4 eyeVertex = vertices[indices[i]].transformBy4(view.getModelviewMatrix());
if (eyeVertex.z() >= 0)
{
return(Double.PositiveInfinity);
}
}
for (int i = 0; i < indices.Length; i++)
{
screenVertices[i] = view.project(vertices[indices[i]]);
}
// Compute the area of the convex hull by treating the projected vertices as a 2D polygon. If this Box's r, s,
// and t axes define a right-handed coordinate system, the vertices have a counter-clockwise winding order on
// screen and the area is positive. If the axes define a left-handed coordinate system, the vertices have a
// clockwise winding order on scree and the area is negative. We return the area's absolute value to handle
// either case.
double area = WWMath.computePolygonAreaFromVertices(screenVertices);
return(Math.Abs(area));
}
/**
* Compute a <code>Box</code> that bounds a specified list of points. Principal axes are computed for the points and
* used to form a <code>Box</code>.
*
* @param points the points for which to compute a bounding volume.
*
* @return the bounding volume, with axes lengths consistent with the conventions described in the <code>Box</code>
* class overview.
*
* @throws ArgumentException if the point list is null or empty.
*/
public static Box computeBoundingBox(IEnumerable <Vec4> points)
{
if (points == null)
{
String msg = Logging.getMessage("nullValue.PointListIsNull");
Logging.logger().severe(msg);
throw new ArgumentException(msg);
}
Vec4[] axes = WWMath.computePrincipalAxes(points);
if (axes == null)
{
String msg = Logging.getMessage("generic.ListIsEmpty");
Logging.logger().severe(msg);
throw new ArgumentException(msg);
}
Vec4 r = axes[0];
Vec4 s = axes[1];
Vec4 t = axes[2];
// Find the extremes along each axis.
double minDotR = Double.MaxValue;
double maxDotR = -minDotR;
double minDotS = Double.MaxValue;
double maxDotS = -minDotS;
double minDotT = Double.MaxValue;
double maxDotT = -minDotT;
foreach (Vec4 p in points)
{
if (p == null)
{
continue;
}
double pdr = p.dot3(r);
if (pdr < minDotR)
{
minDotR = pdr;
}
if (pdr > maxDotR)
{
maxDotR = pdr;
}
double pds = p.dot3(s);
if (pds < minDotS)
{
minDotS = pds;
}
if (pds > maxDotS)
{
maxDotS = pds;
}
double pdt = p.dot3(t);
if (pdt < minDotT)
{
minDotT = pdt;
}
if (pdt > maxDotT)
{
maxDotT = pdt;
}
}
if (maxDotR == minDotR)
{
maxDotR = minDotR + 1;
}
if (maxDotS == minDotS)
{
maxDotS = minDotS + 1;
}
if (maxDotT == minDotT)
{
maxDotT = minDotT + 1;
}
return(new Box(axes, minDotR, maxDotR, minDotS, maxDotS, minDotT, maxDotT));
}
/** {@inheritDoc} */
public Intersection[] intersect(Line line)
{
return(WWMath.polytopeIntersect(line, this.planes));
}
/**
* Returns an OpenGL pixel format corresponding to the specified texture internal format. This maps internal format
* to pixel format as follows: <code> <table> <tr><th>Internal Format</th><th>Estimated Bits Per Pixel</th></tr>
* <tr><td>GL2.GL_ALPHA</td><td>8</td></tr> <tr><td>GL2.GL_ALPHA4</td><td>4</td></tr>
* <tr><td>GL2.GL_ALPHA8</td><td>8</td></tr> <tr><td>GL2.GL_ALPHA12</td><td>12</td></tr>
* <tr><td>GL2.GL_ALPHA16</td><td>16</td></tr> <tr><td>GL2.GL_COMPRESSED_ALPHA</td><td>0</td></tr>
* <tr><td>GL2.GL_COMPRESSED_LUMINANCE</td><td>0</td></tr> <tr><td>GL2.GL_COMPRESSED_LUMINANCE_ALPHA</td><td>0</td></tr>
* <tr><td>GL2.GL_COMPRESSED_INTENSITY</td><td>0</td></tr> <tr><td>GL2.GL_COMPRESSED_RGB</td><td>0</td></tr>
* <tr><td>GL2.GL_COMPRESSED_RGBA</td><td>0</td></tr> <tr><td>GL2.GL_DEPTH_COMPONENT</td><td>24</td></tr>
* <tr><td>GL2.GL_DEPTH_COMPONENT16</td><td>16</td></tr> <tr><td>GL2.GL_DEPTH_COMPONENT24</td><td>24</td></tr>
* <tr><td>GL2.GL_DEPTH_COMPONENT32</td><td>32</td></tr> <tr><td>GL2.GL_LUMINANCE</td><td>8</td></tr>
* <tr><td>GL2.GL_LUMINANCE4</td><td>4</td></tr> <tr><td>GL2.GL_LUMINANCE8</td><td>8</td></tr>
* <tr><td>GL2.GL_LUMINANCE12</td><td>12</td></tr> <tr><td>GL2.GL_LUMINANCE16</td><td>16</td></tr>
* <tr><td>GL2.GL_LUMINANCE_ALPHA</td><td>16</td></tr> <tr><td>GL2.GL_LUMINANCE4_ALPHA4</td><td>8</td></tr>
* <tr><td>GL2.GL_LUMINANCE6_ALPHA2</td><td>8</td></tr> <tr><td>GL2.GL_LUMINANCE8_ALPHA8</td><td>16</td></tr>
* <tr><td>GL2.GL_LUMINANCE12_ALPHA4</td><td>16</td></tr> <tr><td>GL2.GL_LUMINANCE12_ALPHA12</td><td>24</td></tr>
* <tr><td>GL2.GL_LUMINANCE16_ALPHA16</td><td>32</td></tr> <tr><td>GL2.GL_INTENSITY</td><td>8</td></tr>
* <tr><td>GL2.GL_INTENSITY4</td><td>4</td></tr> <tr><td>GL2.GL_INTENSITY8</td><td>8</td></tr>
* <tr><td>GL2.GL_INTENSITY12</td><td>12</td></tr> <tr><td>GL2.GL_INTENSITY16</td><td>16</td></tr>
* <tr><td>GL2.GL_R3_G3_B2</td><td>8</td></tr> <tr><td>GL2.GL_RGB</td><td>24</td></tr>
* <tr><td>GL2.GL_RGB4</td><td>12</td></tr> <tr><td>GL2.GL_RGB5</td><td>16 (assume the driver allocates 16 bits per
* pixel)</td></tr> <tr><td>GL2.GL_RGB8</td><td>24</td></tr> <tr><td>GL2.GL_RGB10</td><td>32 (assume the driver
* allocates 32 bits per pixel)</td></tr> <tr><td>GL2.GL_RGB12</td><td>36</td></tr>
* <tr><td>GL2.GL_RGB16</td><td>48</td></tr> <tr><td>GL2.GL_RGBA</td><td>32</td></tr>
* <tr><td>GL2.GL_RGBA2</td><td>8</td></tr> <tr><td>GL2.GL_RGBA4</td><td>16</td></tr>
* <tr><td>GL2.GL_RGB5_A1</td><td>16</td></tr> <tr><td>GL2.GL_RGBA8</td><td>32</td></tr>
* <tr><td>GL2.GL_RGB10_A2</td><td>32</td></tr> <tr><td>GL2.GL_RGBA12</td><td>48</td></tr>
* <tr><td>GL2.GL_RGBA16</td><td>64</td></tr> <tr><td>GL2.GL_SLUMINANCE</td><td>8</td></tr>
* <tr><td>GL2.GL_SLUMINANCE8</td><td>8</td></tr> <tr><td>GL2.GL_SLUMINANCE_ALPHA</td><td>16</td></tr>
* <tr><td>GL2.GL_SLUMINANCE8_ALPHA8</td><td>16<td></tr> <tr><td>GL2.GL_SRGB</td><td>24</td></tr>
* <tr><td>GL2.GL_SRGB8</td><td>24</td></tr> <tr><td>GL2.GL_SRGB_ALPHA</td><td>32</td></tr>
* <tr><td>GL2.GL_SRGB8_ALPHA8</td><td>32</td></tr> </code>
* <p/>
* The returned estimate assumes that the driver provides does not convert the formats to another supported, such
* converting as <code>GL2.GL_ALPHA4</code> to <code>GL2.GL_ALPHA8</code>. This returns 0 if the internal format is
* not one of the recognized types. This does not attempt to estimate a memory size for compressed internal
* formats.
*
* @param internalFormat the OpenGL texture internal format.
* @param width the texture width, in pixels.
* @param height the texture height, in pixels.
* @param includeMipmaps true to include the texture's mip map data in the estimated size; false otherwise.
*
* @return a pixel format corresponding to the texture internal format, or 0 if the internal format is not
* recognized.
*
* @throws ArgumentException if either the width or height is less than or equal to zero.
*/
public static int estimateTextureMemorySize(int internalFormat, int width, int height, bool includeMipmaps)
{
if (width < 0)
{
String message = Logging.getMessage("Geom.WidthInvalid", width);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
if (height < 0)
{
String message = Logging.getMessage("Geom.HeightInvalid", height);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
int numPixels = width * height;
// Add the number of pixels from each level in the mipmap chain to the total number of pixels.
if (includeMipmaps)
{
int maxLevel = Math.Max((int)WWMath.LogBase2(width), (int)WWMath.LogBase2(height));
for (int level = 1; level <= maxLevel; level++)
{
int w = Math.Max(width >> level, 1);
int h = Math.Max(height >> level, 1);
numPixels += w * h;
}
}
switch (internalFormat)
{
// 4 bits per pixel.
case GL2.GL_ALPHA4:
case GL2.GL_LUMINANCE4:
case GL2.GL_INTENSITY4:
return(numPixels / 2);
// 8 bits per pixel.
case GL2.GL_ALPHA:
case GL2.GL_ALPHA8:
case GL2.GL_LUMINANCE:
case GL2.GL_LUMINANCE8:
case GL2.GL_LUMINANCE4_ALPHA4:
case GL2.GL_LUMINANCE6_ALPHA2:
case GL2.GL_INTENSITY:
case GL2.GL_INTENSITY8:
case GL2.GL_R3_G3_B2:
case GL2.GL_RGBA2:
case GL2.GL_SLUMINANCE:
case GL2.GL_SLUMINANCE8:
return(numPixels);
// 12 bits per pixel.
case GL2.GL_ALPHA12:
case GL2.GL_LUMINANCE12:
case GL2.GL_INTENSITY12:
case GL2.GL_RGB4:
return(12 * numPixels / 8);
// 16 bits per pixel.
case GL2.GL_ALPHA16:
case GL2.GL_DEPTH_COMPONENT16:
case GL2.GL_LUMINANCE16:
case GL2.GL_LUMINANCE_ALPHA:
case GL2.GL_LUMINANCE8_ALPHA8:
case GL2.GL_LUMINANCE12_ALPHA4:
case GL2.GL_INTENSITY16:
case GL2.GL_RGB5: // Assume the driver allocates 16 bits per pixel for GL_RGB5.
case GL2.GL_RGBA4:
case GL2.GL_RGB5_A1:
case GL2.GL_SLUMINANCE_ALPHA:
case GL2.GL_SLUMINANCE8_ALPHA8:
return(2 * numPixels);
// 24 bits per pixel.
case GL2.GL_DEPTH_COMPONENT:
case GL2.GL_DEPTH_COMPONENT24:
case GL2.GL_LUMINANCE12_ALPHA12:
case GL2.GL_RGB:
case GL2.GL_RGB8:
case GL2.GL_SRGB:
case GL2.GL_SRGB8:
return(3 * numPixels);
// 32 bits per pixel.
case GL2.GL_DEPTH_COMPONENT32:
case GL2.GL_LUMINANCE16_ALPHA16:
case GL2.GL_RGB10: // Assume the driver allocates 32 bits per pixel for GL_RGB10.
case GL2.GL_RGBA:
case GL2.GL_RGBA8:
case GL2.GL_RGB10_A2:
case GL2.GL_SRGB_ALPHA:
case GL2.GL_SRGB8_ALPHA8:
return(4 * numPixels);
// 36 bits per pixel.
case GL2.GL_RGB12:
return(36 * numPixels / 8);
// 48 bits per pixel.
case GL2.GL_RGB16:
case GL2.GL_RGBA12:
return(6 * numPixels);
// 64 bits per pixel.
case GL2.GL_RGBA16:
return(8 * numPixels);
// Compressed internal formats. Don't try to estimate a size for compressed formats.
case GL2.GL_COMPRESSED_ALPHA:
case GL2.GL_COMPRESSED_LUMINANCE:
case GL2.GL_COMPRESSED_LUMINANCE_ALPHA:
case GL2.GL_COMPRESSED_INTENSITY:
case GL2.GL_COMPRESSED_RGB:
case GL2.GL_COMPRESSED_RGBA:
return(0);
default:
return(0);
}
}