Rotate Object OpenGL ES 2.0
<p>we are using the following code to plot a BMP image in OpenGL ES 2.0: 
(x1,y1 is lower left coordinates, and x2,y2 are top right coordinates of the objects on the screen, tempimage data is the pointer to bmp image information stored)</p>

<pre><code>struct
{
  GLuint uiId;
  GLuint uiLowerLeftLoc;
  GLuint uiScaleMatrixLoc;
  GLuint auiLoc[eNumUniforms];
}
m_ShaderProgram;

glUniform2f(m_ShaderProgram.uiLowerLeftLoc, x1, y1);
float afMatrix[4] = { x2 - x1, 0, 0, y2 - y1 };
glUniformMatrix2fv(m_ShaderProgram.uiScaleMatrixLoc, 1, GL_FALSE, afMatrix);
glBindTexture(GL_TEXTURE_2D, m_uiTexForeground);
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, tempimagedata);
glBindBuffer(GL_ARRAY_BUFFER, m_uiVbo);
glEnableVertexAttribArray(VERTEX_ARRAY);
glVertexAttribPointer(VERTEX_ARRAY, 2, GL_FLOAT, GL_FALSE, 0, 0);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableVertexAttribArray(VERTEX_ARRAY);
</code></pre>

<p>I want to rotate the object in terms of angles. How this can be achieved ?</p>