136 	ESMatrix    frust;  in esFrustum()  local
142 	frust.m[0][0] = 2.0f * nearZ / deltaX;  in esFrustum()
143 	frust.m[0][1] = frust.m[0][2] = frust.m[0][3] = 0.0f;  in esFrustum()
145 	frust.m[1][1] = 2.0f * nearZ / deltaY;  in esFrustum()
146 	frust.m[1][0] = frust.m[1][2] = frust.m[1][3] = 0.0f;  in esFrustum()
148 	frust.m[2][0] = (right + left) / deltaX;  in esFrustum()
149 	frust.m[2][1] = (top + bottom) / deltaY;  in esFrustum()
150 	frust.m[2][2] = -(nearZ + farZ) / deltaZ;  in esFrustum()
151 	frust.m[2][3] = -1.0f;  in esFrustum()
153 	frust.m[3][2] = -2.0f * nearZ * farZ / deltaZ;  in esFrustum()
154 	frust.m[3][0] = frust.m[3][1] = frust.m[3][3] = 0.0f;  in esFrustum()
156 	esMatrixMultiply(result, &frust, result);  in esFrustum()