HLSL shader doesn't work

Question

I've made two shaders that share almost all the code except for a line that shouldn't change the result. That's the shared part of code:

struct VOut
{
    float4 position : SV_POSITION;
    float4 color : COLOR;
    float4 ld1 : LD;
};

 cbuffer LIGHT : register (cb0)
{
    float4 light_direction;
    float4 light_color;

};

cbuffer TRANSFORMATION_MATRIX : register (cb1)
{
    float4x4 transformationMatrix;
};

cbuffer CAM_PROJ_MATRIX : register (cb2)
{
    float4x4 cameraProjectionMatrix;
};

float4 PShader(float4 position : SV_POSITION, float4 color : COLOR) : SV_TARGET
{
return color;
}

The part that changes is the vertex shader:

 VOut VShader(float3 position : POSITION, float4 color : COLOR)
 {
    VOut output;

    float4 rpos = mul(transformationMatrix,float4(position, 1.0));

    output.position = mul(cameraProjectionMatrix, rpos);

    *output.ld1 = light_direction;*

    output.color = color;

    return output;
}

This one works fine, but if I change the line between asterisks (obviously the asterisks are not in the real code) to:

output.ld1 = float4(1.0,1.0,1.0,1.0);

then I don't see anything on the screen. How's this thing possible?

LD is not a standard semantic, so it doesn't have any meaning. Try using TEXCOORD0 to get a valid inter-stage interpolator. — Chuck Walbourn

DanielFawcett DanielFawcett · Accepted Answer · 2018-01-02T15:10:05

  struct VOut
    {
        float4 position : SV_POSITION;
        float4 color : COLOR;
        float4 ld1 : TEXCOORD0;
    };

HLSL shader doesn't work

1 Answers