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uniform sampler2D diffuseMap;
void main()
{
vec4 color1 = texture2D(diffuseMap, gl_TexCoord[0].xy);
vec4 color2 = texture2D(diffuseMap, gl_TexCoord[1].xy);
vec4 color3 = texture2D(diffuseMap, gl_TexCoord[2].xy);
vec4 color4 = texture2D(diffuseMap, gl_TexCoord[3].xy);
vec4 color5 = texture2D(diffuseMap, gl_TexCoord[4].xy);
vec4 col = (color1+color2+color3+color4+color5)*0.21;
col = max(col, col*0.25 + color5*0.75);
gl_FragColor = col;
}
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