XNA中的进度条着色器出现问题 [英] Issue with progress bar shader in XNA

问题描述

我正在为XNA中的绘制进度条创建一个简单的着色器.

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

想法很简单:有两个纹理和值，如果X纹理坐标小于或等于值，则使用前景纹理中的像素，否则使用背景纹理.

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();
    }
}

但仅更正ForegroundTexture. BackgroundSampler只是白色. 我发现正确的仅显示了最后在着色器中声明的纹理.

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

请帮助我理解为什么?

推荐答案

我知道了！

着色器都正确.

Mistake受伤了:

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();

正确的变体是:

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();

我忘记了首先声明的纹理使用与传递给Draw方法的纹理相同的索引.

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

也许对某人有用.

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