* Using a ByteBuffer as the source guarantees * keeping the source native order programmatically. * This works around Honeycomb / Android 3.0 Issue 16434. * This bug is resolved at least in Android 3.2. *
* * @param buf source Buffer, maybe ByteBuffer (recommended) or FloatBuffer ornull.
* Buffer's position is ignored and floatPos is being used.
* @param backing source float array or null
* @param floatPos {@link Buffers#SIZEOF_FLOAT} position
* @param floatSize {@link Buffers#SIZEOF_FLOAT} size
* @return FloatBuffer w/ native byte order as given ByteBuffer
*/
public static FloatBuffer slice2Float(Buffer buf, float[] backing, int floatPos, int floatSize) {
if(buf instanceof ByteBuffer) {
ByteBuffer bb = (ByteBuffer) buf;
bb.position( floatPos * Buffers.SIZEOF_FLOAT );
bb.limit( (floatPos + floatSize) * Buffers.SIZEOF_FLOAT );
FloatBuffer fb = bb.slice().order(bb.order()).asFloatBuffer(); // slice and duplicate may change byte order
fb.mark();
return fb;
} else if(null != backing) {
FloatBuffer fb = FloatBuffer.wrap(backing, floatPos, floatSize);
fb.mark();
return fb;
} else if(buf instanceof FloatBuffer) {
FloatBuffer fb = (FloatBuffer) buf;
fb.position( floatPos );
fb.limit( floatPos + floatSize );
FloatBuffer fb0 = fb.slice(); // slice and duplicate may change byte order
fb0.mark();
return fb0;
} else {
throw new InternalError("XXX");
}
}
public static final int getRequiredFloatBufferSize() { return 2*16+2*4+3*3; }
// Note that we have cloned parts of the implementation in order to
// support incoming Buffers. The reason for this is to avoid loading
// non-direct buffer subclasses unnecessarily, because doing so can
// cause performance decreases on direct buffer operations, at least
// on the current HotSpot JVM. It would be nicer (and make the code
// simpler) to simply have the array-based entry points delegate to
// the versions taking Buffers by wrapping the arrays.
// Array-based implementation
private final float[] matrix = new float[16];
private final float[][] tempInvertMatrix = new float[4][4];
private final float[] in = new float[4];
private final float[] out = new float[4];
// Buffer-based implementation
private FloatBuffer matrixBuf;
private FloatBuffer tempInvertMatrixBuf;
private FloatBuffer inBuf;
private FloatBuffer outBuf;
private FloatBuffer forwardBuf;
private FloatBuffer sideBuf;
private FloatBuffer upBuf;
public ProjectFloat() {
this(false);
}
public ProjectFloat(boolean useBackingArray) {
this(useBackingArray ? null : Buffers.newDirectByteBuffer(getRequiredFloatBufferSize() * Buffers.SIZEOF_FLOAT),
useBackingArray ? new float[getRequiredFloatBufferSize()] : null,
0);
}
/**
* @param floatBuffer source buffer, may be ByteBuffer (recommended) or FloatBuffer or null.
* If used, shall be ≥ {@link #getRequiredFloatBufferSize()} + floatOffset.
* Buffer's position is ignored and floatPos is being used.
* @param floatArray source float array or null.
* If used, size shall be ≥ {@link #getRequiredFloatBufferSize()} + floatOffset.
* @param floatOffset Offset for either of the given sources (buffer or array)
*/
public ProjectFloat(Buffer floatBuffer, float[] floatArray, int floatOffset) {
int floatPos = floatOffset;
int floatSize = 16;
matrixBuf = slice2Float(floatBuffer, floatArray, floatPos, floatSize);
floatPos += floatSize;
tempInvertMatrixBuf = slice2Float(floatBuffer, floatArray, floatPos, floatSize);
floatPos += floatSize;
floatSize = 4;
inBuf = slice2Float(floatBuffer, floatArray, floatPos, floatSize);
floatPos += floatSize;
outBuf = slice2Float(floatBuffer, floatArray, floatPos, floatSize);
floatPos += floatSize;
floatSize = 3;
forwardBuf = slice2Float(floatBuffer, floatArray, floatPos, floatSize);
floatPos += floatSize;
sideBuf = slice2Float(floatBuffer, floatArray, floatPos, floatSize);
floatPos += floatSize;
upBuf = slice2Float(floatBuffer, floatArray, floatPos, floatSize);
}
public void destroy() {
matrixBuf = null;
tempInvertMatrixBuf = null;
inBuf = null;
outBuf = null;
forwardBuf = null;
sideBuf = null;
upBuf = null;
}
/**
* @param src
* @param srcOffset
* @param inverse
* @param inverseOffset
* @return
*/
public boolean gluInvertMatrixf(float[] src, int srcOffset, float[] inverse, int inverseOffset) {
int i, j, k, swap;
float t;
float[][] temp = tempInvertMatrix;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
temp[i][j] = src[i*4+j+srcOffset];
}
}
makeIdentityf(inverse, inverseOffset);
for (i = 0; i < 4; i++) {
//
// Look for largest element in column
//
swap = i;
for (j = i + 1; j < 4; j++) {
if (Math.abs(temp[j][i]) > Math.abs(temp[i][i])) {
swap = j;
}
}
if (swap != i) {
//
// Swap rows.
//
for (k = 0; k < 4; k++) {
t = temp[i][k];
temp[i][k] = temp[swap][k];
temp[swap][k] = t;
t = inverse[i*4+k+inverseOffset];
inverse[i*4+k+inverseOffset] = inverse[swap*4+k+inverseOffset];
inverse[swap*4+k+inverseOffset] = t;
}
}
if (temp[i][i] == 0) {
//
// No non-zero pivot. The matrix is singular, which shouldn't
// happen. This means the user gave us a bad matrix.
//
return false;
}
t = temp[i][i];
for (k = 0; k < 4; k++) {
temp[i][k] /= t;
inverse[i*4+k+inverseOffset] /= t;
}
for (j = 0; j < 4; j++) {
if (j != i) {
t = temp[j][i];
for (k = 0; k < 4; k++) {
temp[j][k] -= temp[i][k] * t;
inverse[j*4+k+inverseOffset] -= inverse[i*4+k+inverseOffset]*t;
}
}
}
}
return true;
}
/**
* @param src
* @param inverse
*
* @return
*/
public boolean gluInvertMatrixf(FloatBuffer src, FloatBuffer inverse) {
int i, j, k, swap;
float t;
int srcPos = src.position();
int invPos = inverse.position();
FloatBuffer temp = tempInvertMatrixBuf;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
temp.put(i*4+j, src.get(i*4+j + srcPos));
}
}
makeIdentityf(inverse);
for (i = 0; i < 4; i++) {
//
// Look for largest element in column
//
swap = i;
for (j = i + 1; j < 4; j++) {
if (Math.abs(temp.get(j*4+i)) > Math.abs(temp.get(i*4+i))) {
swap = j;
}
}
if (swap != i) {
//
// Swap rows.
//
for (k = 0; k < 4; k++) {
t = temp.get(i*4+k);
temp.put(i*4+k, temp.get(swap*4+k));
temp.put(swap*4+k, t);
t = inverse.get(i*4+k + invPos);
inverse.put(i*4+k + invPos, inverse.get(swap*4+k + invPos));
inverse.put(swap*4+k + invPos, t);
}
}
if (temp.get(i*4+i) == 0) {
//
// No non-zero pivot. The matrix is singular, which shouldn't
// happen. This means the user gave us a bad matrix.
//
return false;
}
t = temp.get(i*4+i);
for (k = 0; k < 4; k++) {
temp.put(i*4+k, temp.get(i*4+k) / t);
inverse.put(i*4+k + invPos, inverse.get(i*4+k + invPos) / t);
}
for (j = 0; j < 4; j++) {
if (j != i) {
t = temp.get(j*4+i);
for (k = 0; k < 4; k++) {
temp.put(j*4+k, temp.get(j*4+k) - temp.get(i*4+k) * t);
inverse.put(j*4+k + invPos, inverse.get(j*4+k + invPos) - inverse.get(i*4+k + invPos) * t);
}
}
}
}
return true;
}
/**
* Method gluOrtho2D.
*
* @param left
* @param right
* @param bottom
* @param top
*/
public void gluOrtho2D(GLMatrixFunc gl, float left, float right, float bottom, float top) {
gl.glOrthof(left, right, bottom, top, -1, 1);
}
/**
* Method gluPerspective.
*
* @param fovy
* @param aspect
* @param zNear
* @param zFar
*/
public void gluPerspective(GLMatrixFunc gl, float fovy, float aspect, float zNear, float zFar) {
float sine, cotangent, deltaZ;
float radians = fovy / 2 * (float) Math.PI / 180;
deltaZ = zFar - zNear;
sine = (float) Math.sin(radians);
if ((deltaZ == 0) || (sine == 0) || (aspect == 0)) {
return;
}
cotangent = (float) Math.cos(radians) / sine;
makeIdentityf(matrixBuf);
matrixBuf.put(0 * 4 + 0, cotangent / aspect);
matrixBuf.put(1 * 4 + 1, cotangent);
matrixBuf.put(2 * 4 + 2, - (zFar + zNear) / deltaZ);
matrixBuf.put(2 * 4 + 3, -1);
matrixBuf.put(3 * 4 + 2, -2 * zNear * zFar / deltaZ);
matrixBuf.put(3 * 4 + 3, 0);
gl.glMultMatrixf(matrixBuf);
}
/**
* Method gluLookAt
*
* @param eyex
* @param eyey
* @param eyez
* @param centerx
* @param centery
* @param centerz
* @param upx
* @param upy
* @param upz
*/
public void gluLookAt(GLMatrixFunc gl,
float eyex, float eyey, float eyez,
float centerx, float centery, float centerz,
float upx, float upy, float upz) {
FloatBuffer forward = this.forwardBuf;
FloatBuffer side = this.sideBuf;
FloatBuffer up = this.upBuf;
forward.put(0, centerx - eyex);
forward.put(1, centery - eyey);
forward.put(2, centerz - eyez);
up.put(0, upx);
up.put(1, upy);
up.put(2, upz);
normalize(forward);
/* Side = forward x up */
cross(forward, up, side);
normalize(side);
/* Recompute up as: up = side x forward */
cross(side, forward, up);
makeIdentityf(matrixBuf);
matrixBuf.put(0 * 4 + 0, side.get(0));
matrixBuf.put(1 * 4 + 0, side.get(1));
matrixBuf.put(2 * 4 + 0, side.get(2));
matrixBuf.put(0 * 4 + 1, up.get(0));
matrixBuf.put(1 * 4 + 1, up.get(1));
matrixBuf.put(2 * 4 + 1, up.get(2));
matrixBuf.put(0 * 4 + 2, -forward.get(0));
matrixBuf.put(1 * 4 + 2, -forward.get(1));
matrixBuf.put(2 * 4 + 2, -forward.get(2));
gl.glMultMatrixf(matrixBuf);
gl.glTranslatef(-eyex, -eyey, -eyez);
}
/**
* Method gluProject
*
* @param objx
* @param objy
* @param objz
* @param modelMatrix
* @param projMatrix
* @param viewport
* @param win_pos
*
* @return
*/
public boolean gluProject(float objx, float objy, float objz,
float[] modelMatrix, int modelMatrix_offset,
float[] projMatrix, int projMatrix_offset,
int[] viewport, int viewport_offset,
float[] win_pos, int win_pos_offset ) {
float[] in = this.in;
float[] out = this.out;
in[0] = objx;
in[1] = objy;
in[2] = objz;
in[3] = 1.0f;
multMatrixVecf(modelMatrix, modelMatrix_offset, in, 0, out);
multMatrixVecf(projMatrix, projMatrix_offset, out, 0, in);
if (in[3] == 0.0f) {
return false;
}
in[3] = (1.0f / in[3]) * 0.5f;
// Map x, y and z to range 0-1
in[0] = in[0] * in[3] + 0.5f;
in[1] = in[1] * in[3] + 0.5f;
in[2] = in[2] * in[3] + 0.5f;
// Map x,y to viewport
win_pos[0+win_pos_offset] = in[0] * viewport[2+viewport_offset] + viewport[0+viewport_offset];
win_pos[1+win_pos_offset] = in[1] * viewport[3+viewport_offset] + viewport[1+viewport_offset];
win_pos[2+win_pos_offset] = in[2];
return true;
}
public boolean gluProject(float objx, float objy, float objz,
FloatBuffer modelMatrix,
FloatBuffer projMatrix,
int[] viewport, int viewport_offset,
float[] win_pos, int win_pos_offset ) {
FloatBuffer in = this.inBuf;
FloatBuffer out = this.outBuf;
in.put(0, objx);
in.put(1, objy);
in.put(2, objz);
in.put(3, 1.0f);
multMatrixVecf(modelMatrix, in, out);
multMatrixVecf(projMatrix, out, in);
if (in.get(3) == 0.0f) {
return false;
}
in.put(3, (1.0f / in.get(3)) * 0.5f);
// Map x, y and z to range 0-1
in.put(0, in.get(0) * in.get(3) + 0.5f);
in.put(1, in.get(1) * in.get(3) + 0.5f);
in.put(2, in.get(2) * in.get(3) + 0.5f);
// Map x,y to viewport
win_pos[0+win_pos_offset] = in.get(0) * viewport[2+viewport_offset] + viewport[0+viewport_offset];
win_pos[1+win_pos_offset] = in.get(1) * viewport[3+viewport_offset] + viewport[1+viewport_offset];
win_pos[2+win_pos_offset] = in.get(2);
return true;
}
/**
* Method gluProject
*
* @param objx
* @param objy
* @param objz
* @param modelMatrix
* @param projMatrix
* @param viewport
* @param win_pos
*
* @return
*/
public boolean gluProject(float objx, float objy, float objz,
FloatBuffer modelMatrix,
FloatBuffer projMatrix,
IntBuffer viewport,
FloatBuffer win_pos) {
FloatBuffer in = this.inBuf;
FloatBuffer out = this.outBuf;
in.put(0, objx);
in.put(1, objy);
in.put(2, objz);
in.put(3, 1.0f);
multMatrixVecf(modelMatrix, in, out);
multMatrixVecf(projMatrix, out, in);
if (in.get(3) == 0.0f) {
return false;
}
in.put(3, (1.0f / in.get(3)) * 0.5f);
// Map x, y and z to range 0-1
in.put(0, in.get(0) * in.get(3) + 0.5f);
in.put(1, in.get(1) * in.get(3) + 0.5f);
in.put(2, in.get(2) * in.get(3) + 0.5f);
// Map x,y to viewport
int vPos = viewport.position();
int wPos = win_pos.position();
win_pos.put(0+wPos, in.get(0) * viewport.get(2+vPos) + viewport.get(0+vPos));
win_pos.put(1+wPos, in.get(1) * viewport.get(3+vPos) + viewport.get(1+vPos));
win_pos.put(2+wPos, in.get(2));
return true;
}
/**
* Method gluUnproject
*
* @param winx
* @param winy
* @param winz
* @param modelMatrix
* @param projMatrix
* @param viewport
* @param obj_pos
*
* @return
*/
public boolean gluUnProject(float winx, float winy, float winz,
float[] modelMatrix, int modelMatrix_offset,
float[] projMatrix, int projMatrix_offset,
int[] viewport, int viewport_offset,
float[] obj_pos, int obj_pos_offset) {
float[] in = this.in;
float[] out = this.out;
multMatrixf(modelMatrix, modelMatrix_offset, projMatrix, projMatrix_offset, matrix, 0);
if (!gluInvertMatrixf(matrix, 0, matrix, 0)) {
return false;
}
in[0] = winx;
in[1] = winy;
in[2] = winz;
in[3] = 1.0f;
// Map x and y from window coordinates
in[0] = (in[0] - viewport[0+viewport_offset]) / viewport[2+viewport_offset];
in[1] = (in[1] - viewport[1+viewport_offset]) / viewport[3+viewport_offset];
// Map to range -1 to 1
in[0] = in[0] * 2 - 1;
in[1] = in[1] * 2 - 1;
in[2] = in[2] * 2 - 1;
multMatrixVecf(matrix, in, out);
if (out[3] == 0.0) {
return false;
}
out[3] = 1.0f / out[3];
obj_pos[0+obj_pos_offset] = out[0] * out[3];
obj_pos[1+obj_pos_offset] = out[1] * out[3];
obj_pos[2+obj_pos_offset] = out[2] * out[3];
return true;
}
public boolean gluUnProject(float winx, float winy, float winz,
FloatBuffer modelMatrix,
FloatBuffer projMatrix,
int[] viewport, int viewport_offset,
float[] obj_pos, int obj_pos_offset) {
FloatBuffer in = this.inBuf;
FloatBuffer out = this.outBuf;
multMatrixf(modelMatrix, projMatrix, matrixBuf);
if (!gluInvertMatrixf(matrixBuf, matrixBuf)) {
return false;
}
in.put(0, winx);
in.put(1, winy);
in.put(2, winz);
in.put(3, 1.0f);
// Map x and y from window coordinates
in.put(0, (in.get(0) - viewport[0+viewport_offset]) / viewport[2+viewport_offset]);
in.put(1, (in.get(1) - viewport[1+viewport_offset]) / viewport[3+viewport_offset]);
// Map to range -1 to 1
in.put(0, in.get(0) * 2 - 1);
in.put(1, in.get(1) * 2 - 1);
in.put(2, in.get(2) * 2 - 1);
multMatrixVecf(matrixBuf, in, out);
if (out.get(3) == 0.0f) {
return false;
}
out.put(3, 1.0f / out.get(3));
obj_pos[0+obj_pos_offset] = out.get(0) * out.get(3);
obj_pos[1+obj_pos_offset] = out.get(1) * out.get(3);
obj_pos[2+obj_pos_offset] = out.get(2) * out.get(3);
return true;
}
/**
* Method gluUnproject
*
* @param winx
* @param winy
* @param winz
* @param modelMatrix
* @param projMatrix
* @param viewport
* @param obj_pos
*
* @return
*/
public boolean gluUnProject(float winx, float winy, float winz,
FloatBuffer modelMatrix,
FloatBuffer projMatrix,
IntBuffer viewport,
FloatBuffer obj_pos) {
FloatBuffer in = this.inBuf;
FloatBuffer out = this.outBuf;
multMatrixf(modelMatrix, projMatrix, matrixBuf);
if (!gluInvertMatrixf(matrixBuf, matrixBuf)) {
return false;
}
in.put(0, winx);
in.put(1, winy);
in.put(2, winz);
in.put(3, 1.0f);
// Map x and y from window coordinates
int vPos = viewport.position();
int oPos = obj_pos.position();
in.put(0, (in.get(0) - viewport.get(0+vPos)) / viewport.get(2+vPos));
in.put(1, (in.get(1) - viewport.get(1+vPos)) / viewport.get(3+vPos));
// Map to range -1 to 1
in.put(0, in.get(0) * 2 - 1);
in.put(1, in.get(1) * 2 - 1);
in.put(2, in.get(2) * 2 - 1);
multMatrixVecf(matrixBuf, in, out);
if (out.get(3) == 0.0f) {
return false;
}
out.put(3, 1.0f / out.get(3));
obj_pos.put(0+oPos, out.get(0) * out.get(3));
obj_pos.put(1+oPos, out.get(1) * out.get(3));
obj_pos.put(2+oPos, out.get(2) * out.get(3));
return true;
}
/**
* Method gluUnproject4
*
* @param winx
* @param winy
* @param winz
* @param clipw
* @param modelMatrix
* @param projMatrix
* @param viewport
* @param near
* @param far
* @param obj_pos
*
* @return
*/
public boolean gluUnProject4(float winx,
float winy,
float winz,
float clipw,
float[] modelMatrix,
int modelMatrix_offset,
float[] projMatrix,
int projMatrix_offset,
int[] viewport,
int viewport_offset,
float near,
float far,
float[] obj_pos,
int obj_pos_offset ) {
float[] in = this.in;
float[] out = this.out;
multMatrixf(modelMatrix, modelMatrix_offset, projMatrix, projMatrix_offset, matrix, 0);
if (!gluInvertMatrixf(matrix, 0, matrix, 0))
return false;
in[0] = winx;
in[1] = winy;
in[2] = winz;
in[3] = clipw;
// Map x and y from window coordinates
in[0] = (in[0] - viewport[0+viewport_offset]) / viewport[2+viewport_offset];
in[1] = (in[1] - viewport[1+viewport_offset]) / viewport[3+viewport_offset];
in[2] = (in[2] - near) / (far - near);
// Map to range -1 to 1
in[0] = in[0] * 2 - 1;
in[1] = in[1] * 2 - 1;
in[2] = in[2] * 2 - 1;
multMatrixVecf(matrix, in, out);
if (out[3] == 0.0f)
return false;
obj_pos[0+obj_pos_offset] = out[0];
obj_pos[1+obj_pos_offset] = out[1];
obj_pos[2+obj_pos_offset] = out[2];
obj_pos[3+obj_pos_offset] = out[3];
return true;
}
/**
* Method gluUnproject4
*
* @param winx
* @param winy
* @param winz
* @param clipw
* @param modelMatrix
* @param projMatrix
* @param viewport
* @param near
* @param far
* @param obj_pos
*
* @return
*/
public boolean gluUnProject4(float winx,
float winy,
float winz,
float clipw,
FloatBuffer modelMatrix,
FloatBuffer projMatrix,
IntBuffer viewport,
float near,
float far,
FloatBuffer obj_pos) {
FloatBuffer in = this.inBuf;
FloatBuffer out = this.outBuf;
multMatrixf(modelMatrix, projMatrix, matrixBuf);
if (!gluInvertMatrixf(matrixBuf, matrixBuf))
return false;
in.put(0, winx);
in.put(1, winy);
in.put(2, winz);
in.put(3, clipw);
// Map x and y from window coordinates
int vPos = viewport.position();
in.put(0, (in.get(0) - viewport.get(0+vPos)) / viewport.get(2+vPos));
in.put(1, (in.get(1) - viewport.get(1+vPos)) / viewport.get(3+vPos));
in.put(2, (in.get(2) - near) / (far - near));
// Map to range -1 to 1
in.put(0, in.get(0) * 2 - 1);
in.put(1, in.get(1) * 2 - 1);
in.put(2, in.get(2) * 2 - 1);
multMatrixVecf(matrixBuf, in, out);
if (out.get(3) == 0.0f)
return false;
int oPos = obj_pos.position();
obj_pos.put(0+oPos, out.get(0));
obj_pos.put(1+oPos, out.get(1));
obj_pos.put(2+oPos, out.get(2));
obj_pos.put(3+oPos, out.get(3));
return true;
}
/**
* Method gluPickMatrix
*
* @param x
* @param y
* @param deltaX
* @param deltaY
* @param viewport
*/
public void gluPickMatrix(GLMatrixFunc gl,
float x,
float y,
float deltaX,
float deltaY,
IntBuffer viewport) {
if (deltaX <= 0 || deltaY <= 0) {
return;
}
/* Translate and scale the picked region to the entire window */
int vPos = viewport.position();
gl.glTranslatef((viewport.get(2+vPos) - 2 * (x - viewport.get(0+vPos))) / deltaX,
(viewport.get(3+vPos) - 2 * (y - viewport.get(1+vPos))) / deltaY,
0);
gl.glScalef(viewport.get(2) / deltaX, viewport.get(3) / deltaY, 1.0f);
}
/**
* Method gluPickMatrix
*
* @param x
* @param y
* @param deltaX
* @param deltaY
* @param viewport
* @param viewport_offset
*/
public void gluPickMatrix(GLMatrixFunc gl,
float x,
float y,
float deltaX,
float deltaY,
int[] viewport,
int viewport_offset) {
if (deltaX <= 0 || deltaY <= 0) {
return;
}
/* Translate and scale the picked region to the entire window */
gl.glTranslatef((viewport[2+viewport_offset] - 2 * (x - viewport[0+viewport_offset])) / deltaX,
(viewport[3+viewport_offset] - 2 * (y - viewport[1+viewport_offset])) / deltaY,
0);
gl.glScalef(viewport[2+viewport_offset] / deltaX, viewport[3+viewport_offset] / deltaY, 1.0f);
}
}