1uniform float u1[4]; 2float index_by_literal() { 3 return u1[0]; 4} 5 6uniform float u2[4]; 7float index_by_loop() { 8 float sum = 0; 9 for (int i = 3; i >= 0; --i) { 10 sum += u2[i]; 11 } 12 return sum; 13} 14 15uniform float u3[4]; 16float index_by_complex_loop() { 17 float prod = 1; 18 for (int i = 0; i < 4; ++i) { 19 prod *= u3[i < 2 ? 0 : i]; 20 } 21 return prod; 22} 23 24uniform float u4[16]; 25float index_out_of_bounds_checked() { 26 float sum = 0; 27 for (float f = -2.3; f < 17.0; f += 3.7) { 28 if (f > 0 && f < 16) { 29 sum -= u4[int(f)]; 30 } 31 } 32 return sum; 33} 34 35float4 main(float2 xy) { 36 return float4( 37 index_by_literal(), 38 index_by_loop(), 39 index_by_complex_loop(), 40 index_out_of_bounds_checked()); 41} 42