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// TP3	if(shader.uniformLocation("shadow_matrix")>=0)	{		xform shadow_matrix;		// Biais pour éviter le self-shadowing		xform bias(0.5f, 0.0f, 0.0f, 0.0f,			0.0f, 0.5f, 0.0f, 0.0f,			0.0f, 0.0f, 0.5f, 0.0f,			0.5f, 0.5f, 0.5f, 1.0f);		shadow_matrix = shadow_matrix * bias;				// Grab modelview and transformation matrices		glGetDoublev(GL_MODELVIEW_MATRIX, _modelView_matrix);		glGetDoublev(GL_PROJECTION_MATRIX, _projection_matrix);						glMatrixMode(GL_TEXTURE);		glActiveTextureARB(GL_TEXTURE7);				glLoadIdentity();			glLoadMatrixd(bias);				// concatating all matrices into one.		glMultMatrixd (_projection_matrix);		glMultMatrixd (_modelView_matrix);		// Go back to normal matrix mode		glMatrixMode(GL_MODELVIEW);		shader.setUniformXform("shadow_matrix", shadow_matrix);	}	setupLighting(shader);	// TP2	setupTextures(shader);