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HLSL-Quelltext

/* --- HLSL Example: --- */
uniform sampler2D tex;
uniform float circleRadius; // 0.5 to get the maximal circle size
float4 PS(float2 texCoord : TEXCOORD0)
{
    float distanceToCenter = distance(texCoord, float2(0.5, 0.5));
    clip(distanceToCenter - circleRadius);
    return tex2D(tex, texCoord);
}

HLSL-Quelltext

/* --- GLSL Example: --- */
uniform sampler2D tex;
uniform float circleRadius; // same here
in vec2 texCoord;
out vec4 fragColor;
void main()
{
    float distanceToCenter = distance(texCoord, float2(0.5, 0.5));
    if (distanceToCenter < circleRadius)
        discard;
    fragColor = texture(tex, texCoord);
}