// Compile with:
// fxc.exe /Tps_2_0 /Fhd3d_shader_yuv.h d3d_shader_yuv.hlsl /Vnd3d_shader_yuv

// Be careful with this shader. You can't use constant slots, since we don't
// load the shader with D3DX. All uniform variables are mapped to hardcoded
// constant slots.

sampler2D tex0 : register(s0);
sampler2D tex1 : register(s1);
sampler2D tex2 : register(s2);

uniform float4x4 colormatrix : register(c0);

float1 sample(sampler2D tex, float2 t)
{
    return tex2D(tex, t).x;
}

float4 main(float2 t0 : TEXCOORD0,
            float2 t1 : TEXCOORD1,
            float2 t2 : TEXCOORD2)
            : COLOR
{
    float4 c = float4(sample(tex0, t0),
                      sample(tex1, t1),
                      sample(tex2, t2),
                      1);
    return mul(c, colormatrix);
}