third_party/skia/resources/sksl/runtime_errors/IllegalShaderSampling.rts

// Expect 15 errors

uniform shader      s;
uniform colorFilter f;
uniform blender     b;

uniform float2 xy;
uniform half4  color;
int i;

half4 eval_shader_xy_color()   { return s.eval(xy, color); }
half4 eval_shader_color()      { return s.eval(color); }
half4 eval_shader_color_xy()   { return s.eval(color, xy); }
half4 eval_shader_empty()      { return s.eval(); }
half4 eval_shader_matrix()     { return s.eval(float3x3(1)); }
half4 eval_shader_comma_expr() { return (i++, s).eval(xy); }

half4 eval_colorFilter_empty()      { return f.eval(); }
half4 eval_colorFilter_xy()         { return f.eval(xy); }
half4 eval_colorFilter_xy_color()   { return f.eval(xy, color); }
half4 eval_colorFilter_comma_expr() { return (s, f).eval(color); }

half4 eval_blender_empty()      { return b.eval(); }
half4 eval_blender_color()      { return b.eval(color); }
half4 eval_blender_xy()         { return b.eval(xy); }
half4 eval_blender_xy_color()   { return b.eval(xy, color); }
half4 eval_blender_comma_expr() { return (b, b).eval(color, color); }

// Correct usage (EXPECT NO ERRORS)

half4 eval_blender() { return b.eval(color, color); }
half4 eval_colorFilter() { return f.eval(color); }
half4 eval_shader() { return s.eval(xy); }

/*%%*
no match for shader::eval(float2, half4)
no match for shader::eval(half4)
no match for shader::eval(half4, float2)
no match for shader::eval()
no match for shader::eval(float3x3)
type mismatch: ',' cannot operate on 'int', 'shader'
no match for colorFilter::eval()
no match for colorFilter::eval(float2)
no match for colorFilter::eval(float2, half4)
type mismatch: ',' cannot operate on 'shader', 'colorFilter'
no match for blender::eval()
no match for blender::eval(half4)
no match for blender::eval(float2)
no match for blender::eval(float2, half4)
type mismatch: ',' cannot operate on 'blender', 'blender'
*%%*/