[SOLVED] Pixel shader returns black

@tylrbd wrote:

Hello! I'm using a pixel shader to draw lights in my game, ported from XNA to Xbox/Windows 10 as a UWP. The .fx file builds through the MonoGame Content Pipeline, but returns all black when used. I apologize, my shader knowledge is minimal.

Shader code:

sampler s0;  
texture lightMask;  
sampler lightSampler = sampler_state
{
    Texture = <lightMask>;
	
    MinFilter = Linear;
    MagFilter = Linear;
    MipFilter = Linear;

    AddressU = Clamp;
    AddressV = Clamp;
}; 
  
float4 PixelShaderFunction(float2 coords: TEXCOORD0) : COLOR0  
{  
    float4 color = tex2D(s0, coords);  
    float4 lightColor = tex2D(lightSampler, coords);

    color *= 1 + lightColor * 3;

    return color;
}  

technique Technique1
{
    pass Pass1
    {
	PixelShader = compile ps_4_0_level_9_1 PixelShaderFunction();
    }
}

And this is how I use it in game:

spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);
 
Game1.lightingEffect.Parameters["lightMask"].SetValue(Game1.lightsTarget);
Game1.lightingEffect.CurrentTechnique.Passes[0].Apply();
 
spriteBatch.Draw(Game1.mainTarget, Vector2.Zero, Color.White);

spriteBatch.End();

Thanks for any help!

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