1 files changed, 131 insertions, 0 deletions
diff --git a/third_party/libwebrtc/sdk/android/api/org/webrtc/GlShader.java b/third_party/libwebrtc/sdk/android/api/org/webrtc/GlShader.java
new file mode 100644
index 0000000000..7efd8d3a95
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+++ b/third_party/libwebrtc/sdk/android/api/org/webrtc/GlShader.java
@@ -0,0 +1,131 @@
+/*
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc;
+
+import android.opengl.GLES20;
+
+import java.nio.FloatBuffer;
+
+// Helper class for handling OpenGL shaders and shader programs.
+public class GlShader {
+  private static final String TAG = "GlShader";
+
+  private static int compileShader(int shaderType, String source) {
+    final int shader = GLES20.glCreateShader(shaderType);
+    if (shader == 0) {
+      throw new RuntimeException("glCreateShader() failed. GLES20 error: " + GLES20.glGetError());
+    }
+    GLES20.glShaderSource(shader, source);
+    GLES20.glCompileShader(shader);
+    int[] compileStatus = new int[] {GLES20.GL_FALSE};
+    GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compileStatus, 0);
+    if (compileStatus[0] != GLES20.GL_TRUE) {
+      Logging.e(
+          TAG, "Compile error " + GLES20.glGetShaderInfoLog(shader) + " in shader:\n" + source);
+      throw new RuntimeException(GLES20.glGetShaderInfoLog(shader));
+    }
+    GlUtil.checkNoGLES2Error("compileShader");
+    return shader;
+  }
+
+  private int program;
+
+  public GlShader(String vertexSource, String fragmentSource) {
+    final int vertexShader = compileShader(GLES20.GL_VERTEX_SHADER, vertexSource);
+    final int fragmentShader = compileShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
+    program = GLES20.glCreateProgram();
+    if (program == 0) {
+      throw new RuntimeException("glCreateProgram() failed. GLES20 error: " + GLES20.glGetError());
+    }
+    GLES20.glAttachShader(program, vertexShader);
+    GLES20.glAttachShader(program, fragmentShader);
+    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) {
+      Logging.e(TAG, "Could not link program: " + GLES20.glGetProgramInfoLog(program));
+      throw new RuntimeException(GLES20.glGetProgramInfoLog(program));
+    }
+    // According to the documentation of glLinkProgram():
+    // "After the link operation, applications are free to modify attached shader objects, compile
+    // attached shader objects, detach shader objects, delete shader objects, and attach additional
+    // shader objects. None of these operations affects the information log or the program that is
+    // part of the program object."
+    // But in practice, detaching shaders from the program seems to break some devices. Deleting the
+    // shaders are fine however - it will delete them when they are no longer attached to a program.
+    GLES20.glDeleteShader(vertexShader);
+    GLES20.glDeleteShader(fragmentShader);
+    GlUtil.checkNoGLES2Error("Creating GlShader");
+  }
+
+  public int getAttribLocation(String label) {
+    if (program == -1) {
+      throw new RuntimeException("The program has been released");
+    }
+    int location = GLES20.glGetAttribLocation(program, label);
+    if (location < 0) {
+      throw new RuntimeException("Could not locate '" + label + "' in program");
+    }
+    return location;
+  }
+
+  /**
+   * Enable and upload a vertex array for attribute `label`. The vertex data is specified in
+   * `buffer` with `dimension` number of components per vertex.
+   */
+  public void setVertexAttribArray(String label, int dimension, FloatBuffer buffer) {
+    setVertexAttribArray(label, dimension, 0 /* stride */, buffer);
+  }
+
+  /**
+   * Enable and upload a vertex array for attribute `label`. The vertex data is specified in
+   * `buffer` with `dimension` number of components per vertex and specified `stride`.
+   */
+  public void setVertexAttribArray(String label, int dimension, int stride, FloatBuffer buffer) {
+    if (program == -1) {
+      throw new RuntimeException("The program has been released");
+    }
+    int location = getAttribLocation(label);
+    GLES20.glEnableVertexAttribArray(location);
+    GLES20.glVertexAttribPointer(location, dimension, GLES20.GL_FLOAT, false, stride, buffer);
+    GlUtil.checkNoGLES2Error("setVertexAttribArray");
+  }
+
+  public int getUniformLocation(String label) {
+    if (program == -1) {
+      throw new RuntimeException("The program has been released");
+    }
+    int location = GLES20.glGetUniformLocation(program, label);
+    if (location < 0) {
+      throw new RuntimeException("Could not locate uniform '" + label + "' in program");
+    }
+    return location;
+  }
+
+  public void useProgram() {
+    if (program == -1) {
+      throw new RuntimeException("The program has been released");
+    }
+    synchronized (EglBase.lock) {
+      GLES20.glUseProgram(program);
+    }
+    GlUtil.checkNoGLES2Error("glUseProgram");
+  }
+
+  public void release() {
+    Logging.d(TAG, "Deleting shader.");
+    // Delete program, automatically detaching any shaders from it.
+    if (program != -1) {
+      GLES20.glDeleteProgram(program);
+      program = -1;
+    }
+  }
+}