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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.apis.graphics.spritetext;
import android.opengl.Matrix;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
/**
* A matrix stack, similar to OpenGL ES's internal matrix stack.
*/
public class MatrixStack {
public MatrixStack() {
commonInit(DEFAULT_MAX_DEPTH);
}
public MatrixStack(int maxDepth) {
commonInit(maxDepth);
}
private void commonInit(int maxDepth) {
mMatrix = new float[maxDepth * MATRIX_SIZE];
mTemp = new float[MATRIX_SIZE * 2];
glLoadIdentity();
}
public void glFrustumf(float left, float right, float bottom, float top,
float near, float far) {
Matrix.frustumM(mMatrix, mTop, left, right, bottom, top, near, far);
}
public void glFrustumx(int left, int right, int bottom, int top, int near,
int far) {
glFrustumf(fixedToFloat(left),fixedToFloat(right),
fixedToFloat(bottom), fixedToFloat(top),
fixedToFloat(near), fixedToFloat(far));
}
public void glLoadIdentity() {
Matrix.setIdentityM(mMatrix, mTop);
}
public void glLoadMatrixf(float[] m, int offset) {
System.arraycopy(m, offset, mMatrix, mTop, MATRIX_SIZE);
}
public void glLoadMatrixf(FloatBuffer m) {
m.get(mMatrix, mTop, MATRIX_SIZE);
}
public void glLoadMatrixx(int[] m, int offset) {
for(int i = 0; i < MATRIX_SIZE; i++) {
mMatrix[mTop + i] = fixedToFloat(m[offset + i]);
}
}
public void glLoadMatrixx(IntBuffer m) {
for(int i = 0; i < MATRIX_SIZE; i++) {
mMatrix[mTop + i] = fixedToFloat(m.get());
}
}
public void glMultMatrixf(float[] m, int offset) {
System.arraycopy(mMatrix, mTop, mTemp, 0, MATRIX_SIZE);
Matrix.multiplyMM(mMatrix, mTop, mTemp, 0, m, offset);
}
public void glMultMatrixf(FloatBuffer m) {
m.get(mTemp, MATRIX_SIZE, MATRIX_SIZE);
glMultMatrixf(mTemp, MATRIX_SIZE);
}
public void glMultMatrixx(int[] m, int offset) {
for(int i = 0; i < MATRIX_SIZE; i++) {
mTemp[MATRIX_SIZE + i] = fixedToFloat(m[offset + i]);
}
glMultMatrixf(mTemp, MATRIX_SIZE);
}
public void glMultMatrixx(IntBuffer m) {
for(int i = 0; i < MATRIX_SIZE; i++) {
mTemp[MATRIX_SIZE + i] = fixedToFloat(m.get());
}
glMultMatrixf(mTemp, MATRIX_SIZE);
}
public void glOrthof(float left, float right, float bottom, float top,
float near, float far) {
Matrix.orthoM(mMatrix, mTop, left, right, bottom, top, near, far);
}
public void glOrthox(int left, int right, int bottom, int top, int near,
int far) {
glOrthof(fixedToFloat(left), fixedToFloat(right),
fixedToFloat(bottom), fixedToFloat(top),
fixedToFloat(near), fixedToFloat(far));
}
public void glPopMatrix() {
preflight_adjust(-1);
adjust(-1);
}
public void glPushMatrix() {
preflight_adjust(1);
System.arraycopy(mMatrix, mTop, mMatrix, mTop + MATRIX_SIZE,
MATRIX_SIZE);
adjust(1);
}
public void glRotatef(float angle, float x, float y, float z) {
Matrix.setRotateM(mTemp, 0, angle, x, y, z);
System.arraycopy(mMatrix, mTop, mTemp, MATRIX_SIZE, MATRIX_SIZE);
Matrix.multiplyMM(mMatrix, mTop, mTemp, MATRIX_SIZE, mTemp, 0);
}
public void glRotatex(int angle, int x, int y, int z) {
glRotatef(angle, fixedToFloat(x), fixedToFloat(y), fixedToFloat(z));
}
public void glScalef(float x, float y, float z) {
Matrix.scaleM(mMatrix, mTop, x, y, z);
}
public void glScalex(int x, int y, int z) {
glScalef(fixedToFloat(x), fixedToFloat(y), fixedToFloat(z));
}
public void glTranslatef(float x, float y, float z) {
Matrix.translateM(mMatrix, mTop, x, y, z);
}
public void glTranslatex(int x, int y, int z) {
glTranslatef(fixedToFloat(x), fixedToFloat(y), fixedToFloat(z));
}
public void getMatrix(float[] dest, int offset) {
System.arraycopy(mMatrix, mTop, dest, offset, MATRIX_SIZE);
}
private float fixedToFloat(int x) {
return x * (1.0f / 65536.0f);
}
private void preflight_adjust(int dir) {
int newTop = mTop + dir * MATRIX_SIZE;
if (newTop < 0) {
throw new IllegalArgumentException("stack underflow");
}
if (newTop + MATRIX_SIZE > mMatrix.length) {
throw new IllegalArgumentException("stack overflow");
}
}
private void adjust(int dir) {
mTop += dir * MATRIX_SIZE;
}
private final static int DEFAULT_MAX_DEPTH = 32;
private final static int MATRIX_SIZE = 16;
private float[] mMatrix;
private int mTop;
private float[] mTemp;
}
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