1 files changed, 404 insertions, 0 deletions
diff --git a/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/util/GlUtil.java b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/util/GlUtil.java
new file mode 100644
index 0000000000..a34cee48f9
--- /dev/null
+++ b/mobile/android/exoplayer2/src/main/java/org/mozilla/thirdparty/com/google/android/exoplayer2/util/GlUtil.java
@@ -0,0 +1,404 @@
+/*
+ * Copyright (C) 2018 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 org.mozilla.thirdparty.com.google.android.exoplayer2.util;
+
+import static android.opengl.GLU.gluErrorString;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.opengl.EGL14;
+import android.opengl.EGLDisplay;
+import android.opengl.GLES11Ext;
+import android.opengl.GLES20;
+import android.text.TextUtils;
+import androidx.annotation.Nullable;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
+import org.mozilla.thirdparty.com.google.android.exoplayer2.ExoPlayerLibraryInfo;
+import java.nio.Buffer;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+import java.nio.IntBuffer;
+import javax.microedition.khronos.egl.EGL10;
+
+/** GL utilities. */
+public final class GlUtil {
+
+  /**
+   * GL attribute, which can be attached to a buffer with {@link Attribute#setBuffer(float[], int)}.
+   */
+  public static final class Attribute {
+
+    /** The name of the attribute in the GLSL sources. */
+    public final String name;
+
+    private final int index;
+    private final int location;
+
+    @Nullable private Buffer buffer;
+    private int size;
+
+    /**
+     * Creates a new GL attribute.
+     *
+     * @param program The identifier of a compiled and linked GLSL shader program.
+     * @param index The index of the attribute. After this instance has been constructed, the name
+     *     of the attribute is available via the {@link #name} field.
+     */
+    public Attribute(int program, int index) {
+      int[] len = new int[1];
+      GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, len, 0);
+
+      int[] type = new int[1];
+      int[] size = new int[1];
+      byte[] nameBytes = new byte[len[0]];
+      int[] ignore = new int[1];
+
+      GLES20.glGetActiveAttrib(program, index, len[0], ignore, 0, size, 0, type, 0, nameBytes, 0);
+      name = new String(nameBytes, 0, strlen(nameBytes));
+      location = GLES20.glGetAttribLocation(program, name);
+      this.index = index;
+    }
+
+    /**
+     * Configures {@link #bind()} to attach vertices in {@code buffer} (each of size {@code size}
+     * elements) to this {@link Attribute}.
+     *
+     * @param buffer Buffer to bind to this attribute.
+     * @param size Number of elements per vertex.
+     */
+    public void setBuffer(float[] buffer, int size) {
+      this.buffer = createBuffer(buffer);
+      this.size = size;
+    }
+
+    /**
+     * Sets the vertex attribute to whatever was attached via {@link #setBuffer(float[], int)}.
+     *
+     * <p>Should be called before each drawing call.
+     */
+    public void bind() {
+      Buffer buffer = Assertions.checkNotNull(this.buffer, "call setBuffer before bind");
+      GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
+      GLES20.glVertexAttribPointer(
+          location,
+          size, // count
+          GLES20.GL_FLOAT, // type
+          false, // normalize
+          0, // stride
+          buffer);
+      GLES20.glEnableVertexAttribArray(index);
+      checkGlError();
+    }
+  }
+
+  /**
+   * GL uniform, which can be attached to a sampler using {@link Uniform#setSamplerTexId(int, int)}.
+   */
+  public static final class Uniform {
+
+    /** The name of the uniform in the GLSL sources. */
+    public final String name;
+
+    private final int location;
+    private final int type;
+    private final float[] value;
+
+    private int texId;
+    private int unit;
+
+    /**
+     * Creates a new GL uniform.
+     *
+     * @param program The identifier of a compiled and linked GLSL shader program.
+     * @param index The index of the uniform. After this instance has been constructed, the name of
+     *     the uniform is available via the {@link #name} field.
+     */
+    public Uniform(int program, int index) {
+      int[] len = new int[1];
+      GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_UNIFORM_MAX_LENGTH, len, 0);
+
+      int[] type = new int[1];
+      int[] size = new int[1];
+      byte[] name = new byte[len[0]];
+      int[] ignore = new int[1];
+
+      GLES20.glGetActiveUniform(program, index, len[0], ignore, 0, size, 0, type, 0, name, 0);
+      this.name = new String(name, 0, strlen(name));
+      location = GLES20.glGetUniformLocation(program, this.name);
+      this.type = type[0];
+
+      value = new float[1];
+    }
+
+    /**
+     * Configures {@link #bind()} to use the specified {@code texId} for this sampler uniform.
+     *
+     * @param texId The GL texture identifier from which to sample.
+     * @param unit The GL texture unit index.
+     */
+    public void setSamplerTexId(int texId, int unit) {
+      this.texId = texId;
+      this.unit = unit;
+    }
+
+    /** Configures {@link #bind()} to use the specified float {@code value} for this uniform. */
+    public void setFloat(float value) {
+      this.value[0] = value;
+    }
+
+    /**
+     * Sets the uniform to whatever value was passed via {@link #setSamplerTexId(int, int)} or
+     * {@link #setFloat(float)}.
+     *
+     * <p>Should be called before each drawing call.
+     */
+    public void bind() {
+      if (type == GLES20.GL_FLOAT) {
+        GLES20.glUniform1fv(location, 1, value, 0);
+        checkGlError();
+        return;
+      }
+
+      if (texId == 0) {
+        throw new IllegalStateException("call setSamplerTexId before bind");
+      }
+      GLES20.glActiveTexture(GLES20.GL_TEXTURE0 + unit);
+      if (type == GLES11Ext.GL_SAMPLER_EXTERNAL_OES) {
+        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, texId);
+      } else if (type == GLES20.GL_SAMPLER_2D) {
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId);
+      } else {
+        throw new IllegalStateException("unexpected uniform type: " + type);
+      }
+      GLES20.glUniform1i(location, unit);
+      GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
+      GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
+      GLES20.glTexParameteri(
+          GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+      GLES20.glTexParameteri(
+          GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+      checkGlError();
+    }
+  }
+
+  private static final String TAG = "GlUtil";
+
+  private static final String EXTENSION_PROTECTED_CONTENT = "EGL_EXT_protected_content";
+  private static final String EXTENSION_SURFACELESS_CONTEXT = "EGL_KHR_surfaceless_context";
+
+  /** Class only contains static methods. */
+  private GlUtil() {}
+
+  /**
+   * Returns whether creating a GL context with {@value EXTENSION_PROTECTED_CONTENT} is possible. If
+   * {@code true}, the device supports a protected output path for DRM content when using GL.
+   */
+  @TargetApi(24)
+  public static boolean isProtectedContentExtensionSupported(Context context) {
+    if (Util.SDK_INT < 24) {
+      return false;
+    }
+    if (Util.SDK_INT < 26 && ("samsung".equals(Util.MANUFACTURER) || "XT1650".equals(Util.MODEL))) {
+      // Samsung devices running Nougat are known to be broken. See
+      // https://github.com/google/ExoPlayer/issues/3373 and [Internal: b/37197802].
+      // Moto Z XT1650 is also affected. See
+      // https://github.com/google/ExoPlayer/issues/3215.
+      return false;
+    }
+    if (Util.SDK_INT < 26
+        && !context
+            .getPackageManager()
+            .hasSystemFeature(PackageManager.FEATURE_VR_MODE_HIGH_PERFORMANCE)) {
+      // Pre API level 26 devices were not well tested unless they supported VR mode.
+      return false;
+    }
+
+    EGLDisplay display = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
+    @Nullable String eglExtensions = EGL14.eglQueryString(display, EGL10.EGL_EXTENSIONS);
+    return eglExtensions != null && eglExtensions.contains(EXTENSION_PROTECTED_CONTENT);
+  }
+
+  /**
+   * Returns whether creating a GL context with {@value EXTENSION_SURFACELESS_CONTEXT} is possible.
+   */
+  @TargetApi(17)
+  public static boolean isSurfacelessContextExtensionSupported() {
+    if (Util.SDK_INT < 17) {
+      return false;
+    }
+    EGLDisplay display = EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
+    @Nullable String eglExtensions = EGL14.eglQueryString(display, EGL10.EGL_EXTENSIONS);
+    return eglExtensions != null && eglExtensions.contains(EXTENSION_SURFACELESS_CONTEXT);
+  }
+
+  /**
+   * If there is an OpenGl error, logs the error and if {@link
+   * ExoPlayerLibraryInfo#GL_ASSERTIONS_ENABLED} is true throws a {@link RuntimeException}.
+   */
+  public static void checkGlError() {
+    int lastError = GLES20.GL_NO_ERROR;
+    int error;
+    while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
+      Log.e(TAG, "glError " + gluErrorString(error));
+      lastError = error;
+    }
+    if (ExoPlayerLibraryInfo.GL_ASSERTIONS_ENABLED && lastError != GLES20.GL_NO_ERROR) {
+      throw new RuntimeException("glError " + gluErrorString(lastError));
+    }
+  }
+
+  /**
+   * Builds a GL shader program from vertex and fragment shader code.
+   *
+   * @param vertexCode GLES20 vertex shader program as arrays of strings. Strings are joined by
+   *     adding a new line character in between each of them.
+   * @param fragmentCode GLES20 fragment shader program as arrays of strings. Strings are joined by
+   *     adding a new line character in between each of them.
+   * @return GLES20 program id.
+   */
+  public static int compileProgram(String[] vertexCode, String[] fragmentCode) {
+    return compileProgram(TextUtils.join("\n", vertexCode), TextUtils.join("\n", fragmentCode));
+  }
+
+  /**
+   * Builds a GL shader program from vertex and fragment shader code.
+   *
+   * @param vertexCode GLES20 vertex shader program.
+   * @param fragmentCode GLES20 fragment shader program.
+   * @return GLES20 program id.
+   */
+  public static int compileProgram(String vertexCode, String fragmentCode) {
+    int program = GLES20.glCreateProgram();
+    checkGlError();
+
+    // Add the vertex and fragment shaders.
+    addShader(GLES20.GL_VERTEX_SHADER, vertexCode, program);
+    addShader(GLES20.GL_FRAGMENT_SHADER, fragmentCode, program);
+
+    // Link and check for errors.
+    GLES20.glLinkProgram(program);
+    int[] linkStatus = new int[] {GLES20.GL_FALSE};
+    GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
+    if (linkStatus[0] != GLES20.GL_TRUE) {
+      throwGlError("Unable to link shader program: \n" + GLES20.glGetProgramInfoLog(program));
+    }
+    checkGlError();
+
+    return program;
+  }
+
+  /** Returns the {@link Attribute}s in the specified {@code program}. */
+  public static Attribute[] getAttributes(int program) {
+    int[] attributeCount = new int[1];
+    GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_ATTRIBUTES, attributeCount, 0);
+    if (attributeCount[0] != 2) {
+      throw new IllegalStateException("expected two attributes");
+    }
+
+    Attribute[] attributes = new Attribute[attributeCount[0]];
+    for (int i = 0; i < attributeCount[0]; i++) {
+      attributes[i] = new Attribute(program, i);
+    }
+    return attributes;
+  }
+
+  /** Returns the {@link Uniform}s in the specified {@code program}. */
+  public static Uniform[] getUniforms(int program) {
+    int[] uniformCount = new int[1];
+    GLES20.glGetProgramiv(program, GLES20.GL_ACTIVE_UNIFORMS, uniformCount, 0);
+
+    Uniform[] uniforms = new Uniform[uniformCount[0]];
+    for (int i = 0; i < uniformCount[0]; i++) {
+      uniforms[i] = new Uniform(program, i);
+    }
+
+    return uniforms;
+  }
+
+  /**
+   * Allocates a FloatBuffer with the given data.
+   *
+   * @param data Used to initialize the new buffer.
+   */
+  public static FloatBuffer createBuffer(float[] data) {
+    return (FloatBuffer) createBuffer(data.length).put(data).flip();
+  }
+
+  /**
+   * Allocates a FloatBuffer.
+   *
+   * @param capacity The new buffer's capacity, in floats.
+   */
+  public static FloatBuffer createBuffer(int capacity) {
+    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(capacity * C.BYTES_PER_FLOAT);
+    return byteBuffer.order(ByteOrder.nativeOrder()).asFloatBuffer();
+  }
+
+  /**
+   * Creates a GL_TEXTURE_EXTERNAL_OES with default configuration of GL_LINEAR filtering and
+   * GL_CLAMP_TO_EDGE wrapping.
+   */
+  public static int createExternalTexture() {
+    int[] texId = new int[1];
+    GLES20.glGenTextures(1, IntBuffer.wrap(texId));
+    GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, texId[0]);
+    GLES20.glTexParameteri(
+        GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
+    GLES20.glTexParameteri(
+        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();
+    return texId[0];
+  }
+
+  private static void addShader(int type, String source, int program) {
+    int shader = GLES20.glCreateShader(type);
+    GLES20.glShaderSource(shader, source);
+    GLES20.glCompileShader(shader);
+
+    int[] result = new int[] {GLES20.GL_FALSE};
+    GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, result, 0);
+    if (result[0] != GLES20.GL_TRUE) {
+      throwGlError(GLES20.glGetShaderInfoLog(shader) + ", source: " + source);
+    }
+
+    GLES20.glAttachShader(program, shader);
+    GLES20.glDeleteShader(shader);
+    checkGlError();
+  }
+
+  private static void throwGlError(String errorMsg) {
+    Log.e(TAG, errorMsg);
+    if (ExoPlayerLibraryInfo.GL_ASSERTIONS_ENABLED) {
+      throw new RuntimeException(errorMsg);
+    }
+  }
+
+  /** Returns the length of the null-terminated string in {@code strVal}. */
+  private static int strlen(byte[] strVal) {
+    for (int i = 0; i < strVal.length; ++i) {
+      if (strVal[i] == '\0') {
+        return i;
+      }
+    }
+    return strVal.length;
+  }
+}