irrlicht/media/pp_opengl.frag

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// Texture sampler
uniform sampler2D TextureSampler;
// TexCoords from vertex shader
varying vec2 TexCoords;
void main (void)
{
// Texture is sampled at Texcoords using texture2D
vec4 Color = texture2D(TextureSampler, TexCoords);
// Inverse the color to produce negative image effect
Color.rgb = 1.0 - Color.rgb;
gl_FragColor = Color;
}