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Updated the shader sample (fixed "blur", added "edge")

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git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1273 4e206d99-4929-0410-ac5d-dfc041789085
This commit is contained in:
LaurentGom 2009-11-11 11:53:20 +00:00
parent 7aabc3c3c1
commit 677e0343e2
2 changed files with 40 additions and 6 deletions
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30
samples/bin/datas/shader/edge.sfx Normal file
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uniform sampler2D texture;
uniform float threshold;
void main()
{
const float offset = 1.0 / 512.0;
vec2 offx = vec2(offset, 0.0);
vec2 offy = vec2(0.0, offset);
vec4 hEdge = texture2D(texture, gl_TexCoord[0].xy - offy) * -2.0 +
texture2D(texture, gl_TexCoord[0].xy + offy) * 2.0 +
texture2D(texture, gl_TexCoord[0].xy - offx - offy) * -1.0 +
texture2D(texture, gl_TexCoord[0].xy - offx + offy) * 1.0 +
texture2D(texture, gl_TexCoord[0].xy + offx - offy) * -1.0 +
texture2D(texture, gl_TexCoord[0].xy + offx + offy) * 1.0;
vec4 vEdge = texture2D(texture, gl_TexCoord[0].xy - offx) * 2.0 +
texture2D(texture, gl_TexCoord[0].xy + offx) * -2.0 +
texture2D(texture, gl_TexCoord[0].xy - offx - offy) * 1.0 +
texture2D(texture, gl_TexCoord[0].xy - offx + offy) * -1.0 +
texture2D(texture, gl_TexCoord[0].xy + offx - offy) * 1.0 +
texture2D(texture, gl_TexCoord[0].xy + offx + offy) * -1.0;
float edge = sqrt(hEdge.rgb * hEdge.rgb + vEdge.rgb * vEdge.rgb);
if (edge > threshold)
gl_FragColor.rgb = vec3(0, 0, 0);
else
gl_FragColor.rgb = vec3(1, 1, 1);
gl_FragColor.a = gl_Color.a * texture2D(texture, gl_TexCoord[0].xy).a;
}