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-rw-r--r--src/jogl/classes/com/jogamp/opengl/FloatUtil.java75
1 files changed, 40 insertions, 35 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/FloatUtil.java b/src/jogl/classes/com/jogamp/opengl/FloatUtil.java
index 54fac46e6..93543eaf6 100644
--- a/src/jogl/classes/com/jogamp/opengl/FloatUtil.java
+++ b/src/jogl/classes/com/jogamp/opengl/FloatUtil.java
@@ -32,6 +32,10 @@ import java.nio.FloatBuffer;
/**
* Basic Float math utility functions.
* <p>
+ * Implementation assumes linear matrix layout in column-major order
+ * matching OpenGL's implementation.
+ * </p>
+ * <p>
* Derived from ProjectFloat.java - Created 11-jan-2004
* </p>
*
@@ -91,29 +95,31 @@ public class FloatUtil {
}
/**
- * @param a
- * @param b
- * @param d result a*b
+ * @param a 4x4 matrix in column-major order
+ * @param b 4x4 matrix in column-major order
+ * @param d result a*b in column-major order
*/
public static final void multMatrixf(final float[] a, int a_off, final float[] b, int b_off, float[] d, int d_off) {
for (int i = 0; i < 4; i++) {
- final float ai0=a[a_off+i+0*4], ai1=a[a_off+i+1*4], ai2=a[a_off+i+2*4], ai3=a[a_off+i+3*4];
+ // one row in column-major order
+ final float ai0=a[a_off+i+0*4], ai1=a[a_off+i+1*4], ai2=a[a_off+i+2*4], ai3=a[a_off+i+3*4]; // row-i of a
d[d_off+i+0*4] = ai0 * b[b_off+0+0*4] + ai1 * b[b_off+1+0*4] + ai2 * b[b_off+2+0*4] + ai3 * b[b_off+3+0*4] ;
d[d_off+i+1*4] = ai0 * b[b_off+0+1*4] + ai1 * b[b_off+1+1*4] + ai2 * b[b_off+2+1*4] + ai3 * b[b_off+3+1*4] ;
d[d_off+i+2*4] = ai0 * b[b_off+0+2*4] + ai1 * b[b_off+1+2*4] + ai2 * b[b_off+2+2*4] + ai3 * b[b_off+3+2*4] ;
d[d_off+i+3*4] = ai0 * b[b_off+0+3*4] + ai1 * b[b_off+1+3*4] + ai2 * b[b_off+2+3*4] + ai3 * b[b_off+3+3*4] ;
}
}
-
+
/**
- * @param a
- * @param b
- * @param d result a*b
+ * @param a 4x4 matrix in column-major order
+ * @param b 4x4 matrix in column-major order
+ * @param d result a*b in column-major order
*/
public static final void multMatrixf(final float[] a, int a_off, final float[] b, int b_off, FloatBuffer d) {
final int dP = d.position();
for (int i = 0; i < 4; i++) {
- final float ai0=a[a_off+i+0*4], ai1=a[a_off+i+1*4], ai2=a[a_off+i+2*4], ai3=a[a_off+i+3*4];
+ // one row in column-major order
+ final float ai0=a[a_off+i+0*4], ai1=a[a_off+i+1*4], ai2=a[a_off+i+2*4], ai3=a[a_off+i+3*4]; // row-i of a
d.put(dP+i+0*4 , ai0 * b[b_off+0+0*4] + ai1 * b[b_off+1+0*4] + ai2 * b[b_off+2+0*4] + ai3 * b[b_off+3+0*4] );
d.put(dP+i+1*4 , ai0 * b[b_off+0+1*4] + ai1 * b[b_off+1+1*4] + ai2 * b[b_off+2+1*4] + ai3 * b[b_off+3+1*4] );
d.put(dP+i+2*4 , ai0 * b[b_off+0+2*4] + ai1 * b[b_off+1+2*4] + ai2 * b[b_off+2+2*4] + ai3 * b[b_off+3+2*4] );
@@ -122,15 +128,16 @@ public class FloatUtil {
}
/**
- * @param a
- * @param b
- * @param d result a*b
+ * @param a 4x4 matrix in column-major order
+ * @param b 4x4 matrix in column-major order
+ * @param d result a*b in column-major order
*/
public static final void multMatrixf(final FloatBuffer a, final float[] b, int b_off, FloatBuffer d) {
final int aP = a.position();
final int dP = d.position();
for (int i = 0; i < 4; i++) {
- final float ai0=a.get(aP+i+0*4), ai1=a.get(aP+i+1*4), ai2=a.get(aP+i+2*4), ai3=a.get(aP+i+3*4);
+ // one row in column-major order
+ final float ai0=a.get(aP+i+0*4), ai1=a.get(aP+i+1*4), ai2=a.get(aP+i+2*4), ai3=a.get(aP+i+3*4); // row-i of a
d.put(dP+i+0*4 , ai0 * b[b_off+0+0*4] + ai1 * b[b_off+1+0*4] + ai2 * b[b_off+2+0*4] + ai3 * b[b_off+3+0*4] );
d.put(dP+i+1*4 , ai0 * b[b_off+0+1*4] + ai1 * b[b_off+1+1*4] + ai2 * b[b_off+2+1*4] + ai3 * b[b_off+3+1*4] );
d.put(dP+i+2*4 , ai0 * b[b_off+0+2*4] + ai1 * b[b_off+1+2*4] + ai2 * b[b_off+2+2*4] + ai3 * b[b_off+3+2*4] );
@@ -139,16 +146,17 @@ public class FloatUtil {
}
/**
- * @param a
- * @param b
- * @param d result a*b
+ * @param a 4x4 matrix in column-major order
+ * @param b 4x4 matrix in column-major order
+ * @param d result a*b in column-major order
*/
public static final void multMatrixf(final FloatBuffer a, final FloatBuffer b, FloatBuffer d) {
final int aP = a.position();
final int bP = b.position();
final int dP = d.position();
for (int i = 0; i < 4; i++) {
- final float ai0=a.get(aP+i+0*4), ai1=a.get(aP+i+1*4), ai2=a.get(aP+i+2*4), ai3=a.get(aP+i+3*4);
+ // one row in column-major order
+ final float ai0=a.get(aP+i+0*4), ai1=a.get(aP+i+1*4), ai2=a.get(aP+i+2*4), ai3=a.get(aP+i+3*4); // row-i of a
d.put(dP+i+0*4 , ai0 * b.get(bP+0+0*4) + ai1 * b.get(bP+1+0*4) + ai2 * b.get(bP+2+0*4) + ai3 * b.get(bP+3+0*4) );
d.put(dP+i+1*4 , ai0 * b.get(bP+0+1*4) + ai1 * b.get(bP+1+1*4) + ai2 * b.get(bP+2+1*4) + ai3 * b.get(bP+3+1*4) );
d.put(dP+i+2*4 , ai0 * b.get(bP+0+2*4) + ai1 * b.get(bP+1+2*4) + ai2 * b.get(bP+2+2*4) + ai3 * b.get(bP+3+2*4) );
@@ -201,10 +209,10 @@ public class FloatUtil {
/**
- * Calculate cross-product
+ * Calculate cross-product of 2 vector
*
- * @param v1
- * @param v2
+ * @param v1 3-component vector
+ * @param v2 3-component vector
* @param result v1 X v2
*/
public static final void cross(float[] v1, float[] v2, float[] result) {
@@ -214,10 +222,10 @@ public class FloatUtil {
}
/**
- * Calculate cross-product
+ * Calculate cross-product of 2 vector
*
- * @param v1
- * @param v2
+ * @param v1 3-component vector
+ * @param v2 3-component vector
* @param result v1 X v2
*/
public static final void cross(FloatBuffer v1, FloatBuffer v2, FloatBuffer result) {
@@ -231,15 +239,14 @@ public class FloatUtil {
}
/**
- * Method __gluMultMatrixVecf
- *
- * @param m_in
+ * @param m_in 4x4 matrix in column-major order
* @param m_in_off
- * @param v_in
+ * @param v_in 4-component column-vector
* @param v_out m_in * v_in
*/
public static final void multMatrixVecf(float[] m_in, int m_in_off, float[] v_in, int v_in_off, float[] v_out) {
for (int i = 0; i < 4; i++) {
+ // (one matrix row in column-major order) X (column vector)
v_out[i] =
v_in[0+v_in_off] * m_in[0*4+i+m_in_off] +
v_in[1+v_in_off] * m_in[1*4+i+m_in_off] +
@@ -249,15 +256,14 @@ public class FloatUtil {
}
/**
- * Method __gluMultMatrixVecf
- *
- * @param m_in
+ * @param m_in 4x4 matrix in column-major order
* @param m_in_off
- * @param v_in
+ * @param v_in 4-component column-vector
* @param v_out m_in * v_in
*/
public static final void multMatrixVecf(float[] m_in, float[] v_in, float[] v_out) {
for (int i = 0; i < 4; i++) {
+ // (one matrix row in column-major order) X (column vector)
v_out[i] =
v_in[0] * m_in[0*4+i] +
v_in[1] * m_in[1*4+i] +
@@ -267,10 +273,8 @@ public class FloatUtil {
}
/**
- * Method __gluMultMatrixVecf
- *
- * @param m_in
- * @param v_in
+ * @param m_in 4x4 matrix in column-major order
+ * @param v_in 4-component column-vector
* @param v_out m_in * v_in
*/
public static final void multMatrixVecf(FloatBuffer m_in, FloatBuffer v_in, FloatBuffer v_out) {
@@ -278,6 +282,7 @@ public class FloatUtil {
int outPos = v_out.position();
int matrixPos = m_in.position();
for (int i = 0; i < 4; i++) {
+ // (one matrix row in column-major order) X (column vector)
v_out.put(i + outPos,
v_in.get(0+inPos) * m_in.get(0*4+i+matrixPos) +
v_in.get(1+inPos) * m_in.get(1*4+i+matrixPos) +
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 17:06:04 +0000