1 files changed, 213 insertions, 0 deletions
diff --git a/src/main/java/de/pixart/messenger/utils/video/TextureRenderer.java b/src/main/java/de/pixart/messenger/utils/video/TextureRenderer.java
new file mode 100644
index 000000000..aa4542fa3
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/utils/video/TextureRenderer.java
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2013 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 de.pixart.messenger.utils.video;
+
+import android.annotation.TargetApi;
+import android.graphics.SurfaceTexture;
+import android.opengl.GLES11Ext;
+import android.opengl.GLES20;
+import android.opengl.Matrix;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+
+@TargetApi(16)
+public class TextureRenderer {
+
+    private static final int FLOAT_SIZE_BYTES = 4;
+    private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
+    private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
+    private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
+    private static final float[] mTriangleVerticesData = {
+            -1.0f, -1.0f, 0, 0.f, 0.f,
+            1.0f, -1.0f, 0, 1.f, 0.f,
+            -1.0f, 1.0f, 0, 0.f, 1.f,
+            1.0f, 1.0f, 0, 1.f, 1.f,
+    };
+    private FloatBuffer mTriangleVertices;
+
+    private static final String VERTEX_SHADER =
+            "uniform mat4 uMVPMatrix;\n" +
+            "uniform mat4 uSTMatrix;\n" +
+            "attribute vec4 aPosition;\n" +
+            "attribute vec4 aTextureCoord;\n" +
+            "varying vec2 vTextureCoord;\n" +
+            "void main() {\n" +
+            "  gl_Position = uMVPMatrix * aPosition;\n" +
+            "  vTextureCoord = (uSTMatrix * aTextureCoord).xy;\n" +
+            "}\n";
+
+    private static final String FRAGMENT_SHADER =
+            "#extension GL_OES_EGL_image_external : require\n" +
+            "precision mediump float;\n" +
+            "varying vec2 vTextureCoord;\n" +
+            "uniform samplerExternalOES sTexture;\n" +
+            "void main() {\n" +
+            "  gl_FragColor = texture2D(sTexture, vTextureCoord);\n" +
+            "}\n";
+
+    private float[] mMVPMatrix = new float[16];
+    private float[] mSTMatrix = new float[16];
+    private int mProgram;
+    private int mTextureID = -12345;
+    private int muMVPMatrixHandle;
+    private int muSTMatrixHandle;
+    private int maPositionHandle;
+    private int maTextureHandle;
+    private int rotationAngle = 0;
+
+    public TextureRenderer(int rotation) {
+        rotationAngle = rotation;
+        mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length * FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer();
+        mTriangleVertices.put(mTriangleVerticesData).position(0);
+        Matrix.setIdentityM(mSTMatrix, 0);
+    }
+
+    public int getTextureId() {
+        return mTextureID;
+    }
+
+    public void drawFrame(SurfaceTexture st, boolean invert) {
+        checkGlError("onDrawFrame start");
+        st.getTransformMatrix(mSTMatrix);
+
+        if (invert) {
+            mSTMatrix[5] = -mSTMatrix[5];
+            mSTMatrix[13] = 1.0f - mSTMatrix[13];
+        }
+
+        GLES20.glUseProgram(mProgram);
+        checkGlError("glUseProgram");
+        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
+        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);
+        mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
+        GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
+        checkGlError("glVertexAttribPointer maPosition");
+        GLES20.glEnableVertexAttribArray(maPositionHandle);
+        checkGlError("glEnableVertexAttribArray maPositionHandle");
+        mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
+        GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false, TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
+        checkGlError("glVertexAttribPointer maTextureHandle");
+        GLES20.glEnableVertexAttribArray(maTextureHandle);
+        checkGlError("glEnableVertexAttribArray maTextureHandle");
+        GLES20.glUniformMatrix4fv(muSTMatrixHandle, 1, false, mSTMatrix, 0);
+        GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
+        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+        checkGlError("glDrawArrays");
+        GLES20.glFinish();
+    }
+
+    public void surfaceCreated() {
+        mProgram = createProgram(VERTEX_SHADER, FRAGMENT_SHADER);
+        if (mProgram == 0) {
+            throw new RuntimeException("failed creating program");
+        }
+        maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
+        checkGlError("glGetAttribLocation aPosition");
+        if (maPositionHandle == -1) {
+            throw new RuntimeException("Could not get attrib location for aPosition");
+        }
+        maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
+        checkGlError("glGetAttribLocation aTextureCoord");
+        if (maTextureHandle == -1) {
+            throw new RuntimeException("Could not get attrib location for aTextureCoord");
+        }
+        muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
+        checkGlError("glGetUniformLocation uMVPMatrix");
+        if (muMVPMatrixHandle == -1) {
+            throw new RuntimeException("Could not get attrib location for uMVPMatrix");
+        }
+        muSTMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uSTMatrix");
+        checkGlError("glGetUniformLocation uSTMatrix");
+        if (muSTMatrixHandle == -1) {
+            throw new RuntimeException("Could not get attrib location for uSTMatrix");
+        }
+        int[] textures = new int[1];
+        GLES20.glGenTextures(1, textures, 0);
+        mTextureID = textures[0];
+        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureID);
+        checkGlError("glBindTexture mTextureID");
+        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
+        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
+        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+        GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+        checkGlError("glTexParameter");
+
+        Matrix.setIdentityM(mMVPMatrix, 0);
+        if (rotationAngle != 0) {
+            Matrix.rotateM(mMVPMatrix, 0, rotationAngle, 0, 0, 1);
+        }
+    }
+
+    public void changeFragmentShader(String fragmentShader) {
+        GLES20.glDeleteProgram(mProgram);
+        mProgram = createProgram(VERTEX_SHADER, fragmentShader);
+        if (mProgram == 0) {
+            throw new RuntimeException("failed creating program");
+        }
+    }
+
+    private int loadShader(int shaderType, String source) {
+        int shader = GLES20.glCreateShader(shaderType);
+        checkGlError("glCreateShader type=" + shaderType);
+        GLES20.glShaderSource(shader, source);
+        GLES20.glCompileShader(shader);
+        int[] compiled = new int[1];
+        GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
+        if (compiled[0] == 0) {
+            GLES20.glDeleteShader(shader);
+            shader = 0;
+        }
+        return shader;
+    }
+
+    private int createProgram(String vertexSource, String fragmentSource) {
+        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
+        if (vertexShader == 0) {
+            return 0;
+        }
+        int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
+        if (pixelShader == 0) {
+            return 0;
+        }
+        int program = GLES20.glCreateProgram();
+        checkGlError("glCreateProgram");
+        if (program == 0) {
+            return 0;
+        }
+        GLES20.glAttachShader(program, vertexShader);
+        checkGlError("glAttachShader");
+        GLES20.glAttachShader(program, pixelShader);
+        checkGlError("glAttachShader");
+        GLES20.glLinkProgram(program);
+        int[] linkStatus = new int[1];
+        GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
+        if (linkStatus[0] != GLES20.GL_TRUE) {
+            GLES20.glDeleteProgram(program);
+            program = 0;
+        }
+        return program;
+    }
+
+    public void checkGlError(String op) {
+        int error;
+        if ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
+            throw new RuntimeException(op + ": glError " + error);
+        }
+    }
+}