GLuint texture = 0;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);

glGenFramebuffers(1, &targetFBO);
 glBindFramebuffer(GL_FRAMEBUFFER, targetFBO);
 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);

- (void) draw {
    GLfloat textureCoordinates[] = {
        0.0f, 0.0f,
        1.0f, 0.0f,
        0.0f,  1.0f,
        1.0f,  1.0f,
    };

    GLfloat imageVertices[] = {
        -1.0f, -1.0f,
        1.0f, -1.0f,
        -1.0f,  1.0f,
        1.0f,  1.0f,
    };

    glViewport(0, 0, targetWidth, targetHeight);
    glBindFramebuffer(GL_FRAMEBUFFER, targetFBO);
    glUseProgram(program);
    glActiveTexture(GL_TEXTURE2);
    glBindTexture(GL_TEXTURE_2D, textureID);
    glUniform1i(inputTextureLocation, 2);
    glDisable(GL_BLEND);

    glVertexAttribPointer(positionLocation, 2, GL_FLOAT, 0, 0, imageVertices);
    glVertexAttribPointer(inputTextureCoordinateLocation, 2, GL_FLOAT, 0, 0, textureCoordinates);
    // Clear the screen
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT);

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

attribute vec4 position;
 attribute vec4 inputTextureCoordinate;

 varying vec2 textureCoordinate;

 void main()
 {
     gl_Position = position;
     textureCoordinate = inputTextureCoordinate.xy;
 }

varying highp vec2 textureCoordinate;

 uniform sampler2D inputTexture;

 void main()
 {
     gl_FragColor = texture2D(inputTexture, textureCoordinate);
 }