| uniform float u1[4]; |
| float index_by_literal() { |
| return u1[0]; |
| } |
| |
| uniform float u2[4]; |
| float index_by_loop() { |
| float sum = 0; |
| for (int i = 3; i >= 0; --i) { |
| sum += u2[i]; |
| } |
| return sum; |
| } |
| |
| uniform float u3[4]; |
| float index_by_complex_loop() { |
| float prod = 1; |
| for (int i = 0; i < 4; ++i) { |
| prod *= u3[i < 2 ? 0 : i]; |
| } |
| return prod; |
| } |
| |
| uniform float u4[16]; |
| float index_out_of_bounds_checked() { |
| float sum = 0; |
| for (float f = -2.3; f < 17.0; f += 3.7) { |
| if (f > 0 && f < 16) { |
| sum -= u4[int(f)]; |
| } |
| } |
| return sum; |
| } |
| |
| float4 main(float2 xy) { |
| return float4( |
| index_by_literal(), |
| index_by_loop(), |
| index_by_complex_loop(), |
| index_out_of_bounds_checked()); |
| } |