Issue with progress bar shader in XNA

Question

I'm create a simple shader for drawing progress bar in XNA.

Idea is simple: there are two textures and value and if X texture coord less then value use pixel from foreground texture, else use background texture.

/* Variables */

texture BackgroundTexture;
sampler2D BackgroundSampler = sampler_state
{
    Texture = (BackgroundTexture);
    MagFilter = Point;
    MinFilter = Point;
    AddressU = Clamp;
    AddressV = Clamp;
};

texture ForegroundTexture;
sampler2D ForegroundSampler = sampler_state
{
    Texture = (ForegroundTexture);
    MagFilter = Point;
    MinFilter = Point;
    AddressU = Clamp;
    AddressV = Clamp;
};

float Value;

/* Pixel shaders */

float4 PixelShader1(float4 pTexCoord : texcoord0) : color0
{
    float4 texColor =
        pTexCoord.x <= Value ?
        tex2D(ForegroundSampler, pTexCoord) :
        tex2D(BackgroundSampler, pTexCoord);

    return texColor;
}

/* Techniques */

technique Technique1
{
    pass Pass1
    {
        PixelShader = compile ps_2_0 PixelShader1();
    }
}

But correct only ForegroundTexture. BackgroundSampler is simply white. I found that correct shown only texture that was declared in shader in last.

Please help me understand why so?

Answers to the post shouldn't be included in the post. Please post your solution as an answer down below. :) — Jwosty, Jun 15 '14 at 05:01

score 2 · Accepted Answer · answered Jun 15 '14 at 15:17

I've got it!

There are all correct with shader.

Mistake was heare:

this.progressBarEffect.Parameters["Value"].SetValue(progressBarValue);
            this.progressBarEffect.Parameters["ForegroundTexture"].SetValue(this.progressBarForegroundTexture);
            this.progressBarEffect.Parameters["BackgroundTexture"].SetValue(this.progressBarBackgroundTexture);
            this.spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, SamplerState.PointWrap, null, null, this.progressBarEffect);
            this.spriteBatch.Draw(this.pixelTexture, new Rectangle(5, 200, 180, 30), Color.White);
            this.spriteBatch.End();

And correct variant is:

this.progressBarEffect.Parameters["Value"].SetValue(progressBarValue);
            //this.progressBarEffect.Parameters["ForegroundTexture"].SetValue(this.progressBarForegroundTexture);
            this.progressBarEffect.Parameters["BackgroundTexture"].SetValue(this.progressBarBackgroundTexture);
            this.spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.Opaque, SamplerState.PointWrap, null, null, this.progressBarEffect);
            this.spriteBatch.Draw(this.progressBarForegroundTexture, new Rectangle(5, 200, 180, 30), Color.White);
            this.spriteBatch.End();

I've forgot that first declared texture use same index that texture passed to Draw method.

Maybe it will be usefull for somebody.

Issue with progress bar shader in XNA

1 Answers1

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