Circle Mask

[DuduzinCp]

Hello, how are you guys? I need help making a circle mask using shaders, until I managed to do so, but I wanted to apply a texture to it too and I'm not able to apply it.]/

//
// Example shader - circle.fx
//

//
// Based on code from:
// http://www.geeks3d.com/20130705/shader-library-circle-disc-fake-sphere-in-glsl-opengl-glslhacker/
//

float sCircleHeightInPixel = 100;
float sCircleWidthInPixel = 100;
float sBorderWidthInPixel = 10;
float sAngleStart = -3.14;
float sAngleEnd = 3.14;

//------------------------------------------------------------------------------------------
// PixelShaderFunction
//  1. Read from PS structure
//  2. Process
//  3. Return pixel color
//------------------------------------------------------------------------------------------
float4 PixelShaderFunction(float4 Diffuse : COLOR0, float2 TexCoord : TEXCOORD0) : COLOR0
{
    float2 uv = float2( TexCoord.x, TexCoord.y ) - float2( 0.5, 0.5 );

    // Clip unwanted pixels from partial pie
    float angle = atan2( -uv.x, uv.y );  // -PI to +PI
    if ( sAngleStart > sAngleEnd )
    {
        if ( angle < sAngleStart && angle > sAngleEnd )
            return 0;
    }
    else
    {
        if ( angle < sAngleStart || angle > sAngleEnd )
            return 0;
    }

    // Calc border width to use
    float2 vec = normalize( uv );
    float CircleRadiusInPixel = lerp( sCircleWidthInPixel, sCircleHeightInPixel, vec.y * vec.y );
    float borderWidth = sBorderWidthInPixel / CircleRadiusInPixel;

    // Check if pixel is inside circle
    float dist =  sqrt( dot( uv, uv ) );
    if ( ( dist > 0.5 ) || ( dist < 0.5 - borderWidth ) )
        return 0;
    else 
        return Diffuse;
}

//------------------------------------------------------------------------------------------
// Techniques
//------------------------------------------------------------------------------------------
technique tec0
{
    pass P0
    {
        PixelShader = compile ps_2_0 PixelShaderFunction();
    }
}

Up here is the shaders file I used and here below is what I did in lua

profile = dxCreateTexture( "assets/images/profile.png" )
function Duduzin_circle( x, y, width, height, color, angleStart, angleSweep, borderWidth )
    height = height or width
    color = color or tocolor(255,255,255)
    borderWidth = borderWidth or 1e9
    angleStart = angleStart or 0
    angleSweep = angleSweep or 360 - angleStart
    if ( angleSweep < 360 ) then
        angleEnd = math.fmod( angleStart + angleSweep, 360 ) + 0
    else
        angleStart = 0
        angleEnd = 360
    end
    x = x - width / 2
    y = y - height / 2
    if not circleShader then
        circleShader = dxCreateShader ( "assets/archives/shader.fx" )
    end
    dxSetShaderValue ( circleShader, "sCircleWidthInPixel", width );
    dxSetShaderValue ( circleShader, "sCircleHeightInPixel", height );
    dxSetShaderValue ( circleShader, "sBorderWidthInPixel", borderWidth );
    dxSetShaderValue ( circleShader, "sAngleStart", math.rad( angleStart ) - math.pi );
    dxSetShaderValue ( circleShader, "sAngleEnd", math.rad( angleEnd ) - math.pi );
    dxSetShaderValue ( circleShader, "Profile", profile)
    dxDrawImage( x, y, width, height, circleShader, 0, 0, 0, color )
end

Well as you can see I put an image and tried to set it in shaders but I couldn't. My idea is to take an image and transform it into a texture then round it with a circle mask!

[AngelAlpha]

you can use mask shader. 
 

profile = dxCreateTexture( "assets/images/profile.png" )
shader = dxCreateShader ( "assets/archives/shader.fx" )

dxSetShaderValue ( shader, "sPicTexture", profile)
dxSetShaderValue ( shader, "sMaskTexture", profile)

function render()
    dxDrawImage( x, y, width, height, shader, 0, 0, 0, color )
end