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In iOS 5, with EAGLView, you can do:
glPushMatrix();
glTranslatef(x, y, 0.0f);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glPopMatrix();
With GLKView, is this replaced by the following?
GLKMatrix4 t = self.effect.transform.modelviewMatrix;
self.effect.transform.modelviewMatrix = GLKMatrix4Translate(t, x, y, 0);
[self.effect prepareToDraw];
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
self.effect.transform.modelviewMatrix = t;
Kind of ugly…
Check out GLKMatrixStack. I use this for building hierarchical models in GLKit.