[pixel shader todo(sm<4)]
uniform float4 x;

float4 main() : sv_target
{
    if (x.x == 9.0f)
        discard;
    return x;
}

[test]
uniform 0 float4 1 2 3 4
todo(sm<4 | glsl) draw quad
probe (0, 0) rgba (1, 2, 3, 4)
uniform 0 float4 9 8 7 6
todo(sm<4 | glsl) draw quad
probe (0, 0) rgba (1, 2, 3, 4)

[require]
shader model >= 3.0

% Check that derivatives are still computed after discarding
% other pixels in the same quad
[pixel shader]
float4 main(float4 pos : sv_position) : sv_target
{
    if (frac((floor(pos.x) + floor(pos.y)) / 2) == 0.5)
        discard;
    return float4(ddx(pos.x), ddx(pos.y), ddy(pos.x), ddy(pos.y));
}

[test]
todo(sm<4 | glsl) draw quad
probe (0, 0) rgba (1, 0, 0, 1)
probe (1, 0) rgba (1, 2, 3, 4)
probe (0, 1) rgba (1, 2, 3, 4)
probe (1, 1) rgba (1, 0, 0, 1)
probe (2, 0) rgba (1, 0, 0, 1)
probe (3, 0) rgba (1, 2, 3, 4)
probe (2, 1) rgba (1, 2, 3, 4)
probe (3, 1) rgba (1, 0, 0, 1)

[require]
shader model >= 5.0
format r32-float uav-load

[uav 1]
format r32-float
size (2d, 2, 1)

0.0 0.0

% Check that side effects stop happening after discard
[pixel shader]
uniform float4 x;
RWTexture2D<float> y : register(u1);

float4 main(float4 pos : sv_position) : sv_target
{
    if (pos.x == 0.5 && pos.y == 0.5)
        y[uint2(0, 0)] += 1;
    if (x.x == 9.0f)
        discard;
    if (pos.x == 0.5 && pos.y == 0.5)
        y[uint2(1, 0)] += 1;
    return x;
}

[test]
uniform 0 float4 1 2 3 4
todo(glsl) draw quad
probe (0, 0) rgba (1, 2, 3, 4)
probe uav 1 (0, 0) r (1.0)
probe uav 1 (1, 0) r (1.0)
uniform 0 float4 9 8 7 6
todo(glsl) draw quad
probe (0, 0) rgba (1, 2, 3, 4)
probe uav 1 (0, 0) r (2.0)
probe uav 1 (1, 0) r (1.0)