[require]
shader model >= 5.0

[vertex shader]
struct data
{
    float4 position : SV_Position;
    float r : RED;
    float g : GREEN;
    float b : BLUE;
};

void main(uint id : SV_VertexID, out data output)
{
    float2 coords = float2((id << 1) & 2, id & 2);
    output.position = float4(coords * float2(2, -2) + float2(-1, 1), 0, 1);
    output.r = 0.0;
    output.g = 1.0;
    output.b = 0.0;
}

[hull shader todo]
struct data
{
    float4 position : SV_Position;
    float r : RED;
    float g : GREEN;
    float b : BLUE;
};

struct patch_constant_data
{
    float edges[3] : SV_TessFactor;
    float inside : SV_InsideTessFactor;
};

void patch_constant(InputPatch<data, 3> input, out patch_constant_data output)
{
    output.edges[0] = output.edges[1] = output.edges[2] = 1.0f;
    output.inside = 1.0f;
}

    [domain("tri")]
    [outputcontrolpoints(3)]
    [partitioning("integer")]
    [outputtopology("triangle_cw")]
    [patchconstantfunc("patch_constant")]
data main(InputPatch<data, 3> input, uint i : SV_OutputControlPointID)
{
    return input[i];
}

[domain shader todo]
struct data
{
    float4 position : SV_Position;
    float r : RED;
    float g : GREEN;
    float b : BLUE;
};

struct patch_constant_data
{
    float edges[3] : SV_TessFactor;
    float inside : SV_InsideTessFactor;
};

    [domain("tri")]
void main(patch_constant_data input,
        float3 tess_coord : SV_DomainLocation,
        const OutputPatch<data, 3> patch,
        out data output)
{
    output.position = tess_coord.x * patch[0].position
            + tess_coord.y * patch[1].position
            + tess_coord.z * patch[2].position;
    output.r = tess_coord.x * patch[0].r + tess_coord.y * patch[1].r + tess_coord.z * patch[2].r;
    output.g = tess_coord.x * patch[0].g + tess_coord.y * patch[1].g + tess_coord.z * patch[2].g;
    output.b = tess_coord.x * patch[0].b + tess_coord.y * patch[1].b + tess_coord.z * patch[2].b;
}

[pixel shader]
struct data
{
    float4 position : SV_Position;
    float r : RED;
    float g : GREEN;
    float b : BLUE;
};

float4 main(data input) : sv_target
{
    return float4(input.r, input.g, input.b, 1.0);
}

[test]
todo(sm<6) draw 3 control point patch list 3
todo(mvk) probe (0, 0, 640, 480) rgba(0.0, 1.0, 0.0, 1.0)