i got 2 dynamic texture ,and want add second texture color to first texture color But just where first texture color alpha is not 0
something like inverse transparncey
i add two pic link to show what is my mean:
TO
just collisions part must add two texture pixel color
ty for your help
Maybe using BlendState.Additive wil be enough for you.
or maybe it can be achieved with a custom BlendState.. but I have not experience with this...
or you can make a shader, you should note that you have to quads:
Quad with a rag doll. (Qrd)
Quad with a circle. (Qc)
you draw Qc over Qrd...
so you have to traduce the texture coordinates that you get in the pixel shader that owns to Qc to texture cordinates at Qrd space...
then you sample the color from Qrd texture,
and if alpha is near zero you clip the pixel...
else you return the sample from Qrc texture
just did it , works great
sampler circleSampler : register(s1);
sampler playerSampler : register(s0);
float4 main(float4 color : COLOR0 ,float2 texCoord : TEXCOORD0):COLOR0
{
float4 output = float4(1,1,1,1);
float4 CircColor = tex2D(circleSampler,texCoord);
float4 playerColor = tex2D(playerSampler,texCoord);
if (CircColor.a ==0)
{
output = playerColor;
}
else
{
output = CircColor* playerColor;
}
output.a = playerColor.a;
return output;
}
technique Technique1
{
pass Pass1
{
PixelShader = compile ps_2_0 main();
}
}
anyway ty for ur time
Related
The sample
If you watch the code, I'm interested in refraction.fx, and in void DrawRefractGlacier(GameTime gameTime) function. Here you can notice that the function uses a texture to render water distortion on an image (waterfall.jpg as "distorter image", and glacier.jpg as distorted image).
If you read inside refraction.fx, at the beginning it says:
// Effect uses a scrolling displacement texture to offset the position of the main
// texture. Depending on the contents of the displacement texture, this can give a
// wide range of refraction, rippling, warping, and swirling type effects.
It seems that would be easy to achieve another effect by changing the image. I tried that with an image like this:
I want to achieve the effect of distorting everything around as a rotating whirl, or a spiral. How can I do that?
Some simple sequential screen of how it looks with my texture:
Refraction shader:
// Effect uses a scrolling displacement texture to offset the position of the main
// texture. Depending on the contents of the displacement texture, this can give a
// wide range of refraction, rippling, warping, and swirling type effects.
float2 DisplacementScroll;
float2 angle;
sampler TextureSampler : register(s0);
sampler DisplacementSampler : register(s1);
float2x2 RotationMatrix(float rotation)
{
float c = cos(rotation);
float s = sin(rotation);
return float2x2(c, -s, s ,c);
}
float4 main(float4 color : COLOR0, float2 texCoord : TEXCOORD0) : COLOR0
{
float2 rotated_texcoord = texCoord;
rotated_texcoord -= float2(0.25, 0.25);
rotated_texcoord = mul(rotated_texcoord, RotationMatrix(angle));
rotated_texcoord += float2(0.25, 0.25);
float2 DispScroll = DisplacementScroll;
// Look up the displacement amount.
float2 displacement = tex2D(DisplacementSampler, DispScroll+ texCoord / 3);
// Offset the main texture coordinates.
texCoord += displacement * 0.2 - 0.15;
// Look up into the main texture.
return tex2D(TextureSampler, texCoord) * color;
}
technique Refraction
{
pass Pass1
{
PixelShader = compile ps_2_0 main();
}
}
Its draw call:
void DrawRefractGlacier(GameTime gameTime)
{
// Set an effect parameter to make the
// displacement texture scroll in a giant circle.
refractionEffect.Parameters["DisplacementScroll"].SetValue(
MoveInCircle(gameTime, 0.2f));
// Set the displacement texture.
graphics.GraphicsDevice.Textures[1] = waterfallTexture;
// Begin the sprite batch.
spriteBatch.Begin(0, null, null, null, null, refractionEffect);
// Because the effect will displace the texture coordinates before
// sampling the main texture, the coordinates could sometimes go right
// off the edges of the texture, which looks ugly. To prevent this, we
// adjust our sprite source region to leave a little border around the
// edge of the texture. The displacement effect will then just move the
// texture coordinates into this border region, without ever hitting
// the edge of the texture.
Rectangle croppedGlacier = new Rectangle(32, 32,
glacierTexture.Width - 64,
glacierTexture.Height - 64);
spriteBatch.Draw(glacierTexture,
GraphicsDevice.Viewport.Bounds,
croppedGlacier,
Color.White);
// End the sprite batch.
spriteBatch.End();
}
I am very new to HLSL to please bear with me...
This is the effect file:
sampler s0;
texture tex;
sampler tex_sampler = sampler_state{Texture = tex;};
float4 PixelShaderFunction(float2 coords: TEXCOORD0) : COLOR0
{
float4 color = tex2D(s0, coords);
float4 tex_color = tex2D(tex_sampler, coords);
if (tex_color.a)
{
// SOMETHING GOES RIGHT HERE BUT I DON'T KNOW WHAT
return color;
}
return tex_color;
}
technique Technique1
{
pass Pass1
{
PixelShader = compile ps_2_0 PixelShaderFunction();
}
}
The "tex" field is the mask.
The "tex_sampler" is the sampler for the mask.
The result contains either pixels with 1 or 0 alpha, but the mask is actually blurred and contains different alpha values. What should I add or change to make this do what I want? This works completely well otherwise.
I belive you need to set renderstates in your technique.
AlphaBlendEnable = true;
SrcBlend = SrcAlpha;
DestBlend = InvSrcAlpha;
How to create a simple pixel color shader that say takes a texture, applyes something like masking:
half4 color = tex2D(_Texture0, i.uv.xy);
if(distance(color, mask) > _CutOff)
{
return color;
}
else
{
return static_color;
}
in and returns a texture that can be passed to next shader from c# code in a way like mats[1].SetTexture("_MainTex", mats[0].GetTexture("_MainTex"));?
But... you might not want to do a shader to only modify a texture.
Why not? It is a common practice.
Check out Graphics.Blit. It basically draws a quad with material (including a shader) applied. So you could use your shader to modify a texture. But the texture has to be RenderTexture.
It would be like this:
var mat = new Material(Shader.Find("My Shader"));
var output = new RenderTexture(...);
Graphics.Blit(sourceTexture, output, mat);
sourceTexture in this case will be bound to _MainTex of My Shader.
I need to pass texture in shader file, but it is giving me error "Invalid call". Please help to tell where i am doing wrong ?
Follow is code which is i have written. I am able to set all the parameter except Texture.
float progress;
float4 colBack;
float reverse;
sampler input : register(s0);
sampler Texture2 : register(s1);
//Code to get the parameterhandle
progressHandle = transitionEffect.GetParameter(null, "progress"));
reverseHandle= transitionEffect.GetParameter(null, "Reverse"));
Texture2Handle= transitionEffect.GetParameter(null, "Texture2"));
//Code to set the value
transitionEffect.SetValue(progressHandle, progress);
transitionEffect.SetValue(reverseHandle, Reverse);
transitionEffect.SetValue(Texture2Handle, smapleTexture);
I found the solution, this may be use for someone else for the same problem.
I need to make Texture structure to pass the texture in shader file. code as follow.
texture Texture;
sampler Texture2 = sampler_state
{
texture = <Texture>;
magfilter = LINEAR;
minfilter = LINEAR;
mipfilter = LINEAR;
AddressU = mirror;
AddressV = mirror;
};
I have a custom template, and I want to somehow take the output of ContentPresenter (imagine it as a bitmap), now strip RGB from that bitmap (so only alpha channel remains), and then set RGB on every pixel to white (preserve alpha channel). So how would you do that?
I'd use a PixelShader + Effect on the ContentPresenter if it needs to be a 'live' effect.
See the Shazzam tool to easily create the sources for the effect and the PixelShader.
sampler2D Texture1Sampler : register(S0);
//-----------------
// Pixel Shader
//-----------------
float4 main(float2 uv : TEXCOORD) : COLOR
{
float4 color = tex2D( Texture1Sampler, uv );
float4 alphaMaskColor = float4(color.a,color.a,color.a,color.a); //Pre-multiplied Alpha in WPF
return alphaMaskColor;
}