Initial Contribution

1 files changed, 135 insertions, 0 deletions

diff --git a/opengl/java/android/opengl/Texture.java b/opengl/java/android/opengl/Texture.java
new file mode 100644
index 000000000000..dcd894d19cfc
--- /dev/null
+++ b/opengl/java/android/opengl/Texture.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2006 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 android.opengl;
+
+import java.io.InputStream;
+import java.io.IOException;
+import java.nio.Buffer;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import javax.microedition.khronos.opengles.GL10;
+
+import android.content.res.AssetManager;
+
+/**
+ * {@hide}
+ */
+public class Texture {
+
+    private int width, height, bpp;
+    private ByteBuffer data;
+    private int name = -1;
+
+    // Texture maps have the following format.  All integers
+    // are 16 bits, high byte first.  Pixels are in 5/6/5
+    // RGB format, low byte first.
+    //
+    // width
+    // height
+    // pixel (0, 0)
+    // pixel (1, 0)
+    // ...
+    // pixel (width - 1, height - 1)
+
+    private int readInt16(InputStream is) throws IOException {
+        return is.read() | (is.read() << 8);
+    }
+
+    public Texture(InputStream is) throws IOException {
+        this.width  = readInt16(is);
+        this.height  = readInt16(is);
+        this.bpp = 2;
+
+        int npixels = width*height;
+        int nbytes = npixels*bpp;
+        byte[] arr = new byte[nbytes];
+
+        int idx = 0;
+        while (idx < nbytes) {
+            int nread = is.read(arr, idx, nbytes - idx);
+            idx += nread;
+        }
+
+        if (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN) {
+            // Swap pairs of bytes on big-endian platforms
+            for (int i = 0; i < npixels; i++) {
+                int j = i*2;
+                int k = j + 1;
+
+                byte tmp = arr[j];
+                arr[j] = arr[k];
+                arr[k] = tmp;
+            }
+        }
+
+        this.data = ByteBuffer.allocateDirect(arr.length);
+        this.data.order(ByteOrder.nativeOrder());
+        data.put(arr);
+        data.position(0);
+    }
+
+    private int loadTexture(GL10 gl,
+            int textureUnit,
+            int minFilter, int magFilter,
+            int wrapS, int wrapT,
+            int mode,
+            int width, int height,
+            int dataType,
+            Buffer data) {
+        int[] texture = new int[1];
+        gl.glGenTextures(1, texture, 0);
+
+        gl.glEnable(gl.GL_TEXTURE_2D);
+        gl.glClientActiveTexture(textureUnit);
+        gl.glBindTexture(gl.GL_TEXTURE_2D, texture[0]);
+        gl.glTexParameterf(gl.GL_TEXTURE_2D,
+                gl.GL_TEXTURE_MIN_FILTER,
+                minFilter);
+        gl.glTexParameterf(gl.GL_TEXTURE_2D,
+                gl.GL_TEXTURE_MAG_FILTER,
+                magFilter);
+        gl.glTexParameterf(gl.GL_TEXTURE_2D,
+                gl.GL_TEXTURE_WRAP_S,
+                wrapS);
+        gl.glTexParameterf(gl.GL_TEXTURE_2D,
+                gl.GL_TEXTURE_WRAP_T,
+                wrapT);
+        gl.glTexEnvf(gl.GL_TEXTURE_ENV, gl.GL_TEXTURE_ENV_MODE, mode);
+
+        gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_RGB,
+                width, height,
+                0, gl.GL_RGB, dataType,
+                data);
+
+        return texture[0];
+    }
+
+    public void setTextureParameters(GL10 gl) {
+        if (name < 0) {
+            name = loadTexture(gl,
+                    gl.GL_TEXTURE0,
+                    gl.GL_NEAREST, gl.GL_NEAREST,
+                    gl.GL_REPEAT, gl.GL_REPEAT,
+                    gl.GL_MODULATE,
+                    width, height,
+                    gl.GL_UNSIGNED_SHORT_5_6_5,
+                    data);
+        }
+
+        gl.glBindTexture(gl.GL_TEXTURE_2D, name);
+    }
+}