1uniform float u; 2 3const float c = 1; 4 float f = 1; 5 6struct S { float f; } s; 7 8// Valid constant-expression initializers. Should not produce errors: 9void from_literal() { const float x = 0; } 10void from_const_global() { const float x = c; } 11void from_const_local() { const float x = 0; const float y = x; } 12void from_const_constructor() { const int i = int(c); } 13void from_expression() { const float x = 2 * c; } 14 15// Invalid constant-expression initializers. Should all produce errors: 16void from_uniform() { const float x = u; } 17void from_parameter(float p) { const float x = p; } 18void from_const_parameter(const float p) { const float x = p; } 19void from_non_const_local() { float x = u; const float y = x; } 20void from_non_const_expression() { const float x = u + u; } 21void from_mixed_expression() { const float x = c + u; } 22void from_non_const_struct_field() { const float x = s.f; } 23 24/*%%* 25'const' variable initializer must be a constant expression 26'const' variable initializer must be a constant expression 27'const' variable initializer must be a constant expression 28'const' variable initializer must be a constant expression 29'const' variable initializer must be a constant expression 30'const' variable initializer must be a constant expression 31'const' variable initializer must be a constant expression 32*%%*/ 33