Flash Effect

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UberLou
- Joined 4 Sep, 2008
- 46 topics • 376 posts
1

21 May, 2009
Quote

I'm trying to make a shader to simply fill a sprite with white to duplicate an effect in older games where a sprite flashes when hit with a bullet. Seems like it should be easy, but since I have no idea what I'm doing I'm having a tough time figuring it out. I've modified the Black & White shader to try and get the effect but its not quite there:

// Foreground texture
texture ForegroundTexture;

// Foreground sampler
sampler2D foreground = sampler_state {
    Texture = (ForegroundTexture);

};

float4 EffectProcess( float2 Tex : TEXCOORD0 ) : COLOR0
{
    float4 front = tex2D(foreground, Tex.xy);
    front.rgb = (front.r + front.g + front.b) * 64;
    return front;
}

// ConstructEffect
technique ConstructEffect
{
    pass p0
    {
        VertexShader = null;
        PixelShader = compile ps_2_0 EffectProcess();
    }
}
[/code:i3f5mved]  

Appreciate any help!

linkman2004
- Joined 15 Jan, 2008
- 98 topics • 1,576 posts
1

21 May, 2009
Quote

If you want it to go pure white, here it is:

// Flash
// Linkman2004
// PS 1.1
// Sets every pixel to white

// Foreground texture
texture ForegroundTexture;

// Foreground sampler
sampler2D foreground = sampler_state {
    Texture = (ForegroundTexture);
    MinFilter = Point;
    MagFilter = Point;
    MipFilter = Point;
};

// Effect function
float4 EffectProcess( float2 Tex : TEXCOORD0 ) : COLOR0
{
    float4 front = tex2D(foreground, Tex.xy);
    front.rgb = 1;
    return front;
}

// ConstructEffect
technique ConstructEffect
{
    pass p0
    {
        VertexShader = null;
        PixelShader = compile ps_1_1 EffectProcess();
    }
}
[/code:2yoyurmx]

- Ashley Construct Team Founder
- Moderator
- - Joined 21 May, 2007
  - 669 topics • 30,353 posts
- 1
- 21 May, 2009
- Quote
You can also do this if you set the colour filter to black (so you get a black silhouette), then use the Invert shader.
- UberLou
- - Joined 4 Sep, 2008
  - 46 topics • 376 posts
- 1
- 21 May, 2009
- Quote
Linkman: I tried your code, but it seems to ignore the alpha, so I get a white square instead of a white silhouette

Ashley: Thanks for the workaround. Slightley annoying to have to change the filter color every time, but it works. I'll use this for now but still looking for help on this shader. I'm trying to learn to write simple shaders so seeing the solution would also be benificial.
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- linkman2004
- - Joined 15 Jan, 2008
  - 98 topics • 1,576 posts
- 1
- 21 May, 2009
- Quote
Damn, I thought that would have worked properly.