Modifying camera output using SurfaceTexture and OpenGL

Question

I am trying to filter the stream coming from the camera hardware by running it through an openGL filter, then displaying it in a GLSurfaceView. When openGL goes to render t

Answer 1

mDirectVideo = new DirectVideo(texture);
texture = createTexture();

should be

texture = createTexture();
mDirectVideo = new DirectVideo(texture);

Shader

private final String vertexShaderCode =
        "attribute vec4 position;" +
        "attribute vec2 inputTextureCoordinate;" +
        "varying vec2 textureCoordinate;" +
        "void main()" +
        "{"+
            "gl_Position = position;"+
            "textureCoordinate = inputTextureCoordinate;" +
        "}";

    private final String fragmentShaderCode =
        "#extension GL_OES_EGL_image_external : require\n"+
        "precision mediump float;" +
        "varying vec2 textureCoordinate;                            \n" +
        "uniform samplerExternalOES s_texture;               \n" +
        "void main() {" +
        "  gl_FragColor = texture2D( s_texture, textureCoordinate );\n" +
        "}";

mColorHandle = GLES20.glGetUniformLocation(mProgram, "vColor");

should be

mColorHandle = GLES20.glGetAttribLocation(mProgram, "s_texture");

remove initialization stuff from DirectVideo draw.glVertexAttribPointer etc. Put it in some init function.

public void draw()
{
    GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, texture);
    GLES20.glDrawElements(GLES20.GL_TRIANGLES, drawOrder.length,
            GLES20.GL_UNSIGNED_SHORT, drawListBuffer);
}