ViewRenderer_draw().java

public void draw(float[] cameraView, float[] cameraPerspective) {
        if (done || !prepared) {
            return;
        }
        synchronized (this) {
            if (frameAvailable) {
                videoTexture.updateTexImage();
                frameAvailable = false;

                if (videoTexture != null) {
                    videoTexture.getTransformMatrix(mTexCoordTransformationMatrix[0]);
                    setVideoDimensions(mTexCoordTransformationMatrix[0]);
                    createQuadTextCoord();
                }
            }
        }
        Matrix.multiplyMM(modelView, 0, cameraView, 0, mModelMatrix, 0);
        Matrix.multiplyMM(modelViewProjection, 0, cameraPerspective, 0, modelView, 0);

        // ShaderUtil.checkGLError(TAG, "Before draw");

        GLES20.glEnable(GL10.GL_BLEND);
        GLES20.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, mTextureId);
        GLES20.glUseProgram(mQuadProgram);


        // Set the vertex positions.
        GLES20.glVertexAttribPointer(mQuadPositionParam, COORDS_PER_VERTEX,
                GLES20.GL_FLOAT, false, 0, mQuadVertices);

        // Set the texture coordinates.
        GLES20.glVertexAttribPointer(mQuadTexCoordParam, TEXCOORDS_PER_VERTEX,
                GLES20.GL_FLOAT, false, 0, fillBuffer(VIDEO_QUAD_TEXTCOORDS_TRANSFORMED));

        // Enable vertex arrays
        GLES20.glEnableVertexAttribArray(mQuadPositionParam);
        GLES20.glEnableVertexAttribArray(mQuadTexCoordParam);
        GLES20.glUniformMatrix4fv(mModelViewProjectionUniform, 1, false,
                modelViewProjection, 0);

        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);

        // Disable vertex arrays
        GLES20.glDisableVertexAttribArray(mQuadPositionParam);
        GLES20.glDisableVertexAttribArray(mQuadTexCoordParam);

        ShaderUtil.checkGLError(TAG, "Draw");
    }