shown black pixels as red

[juanl3l]

I've drawn a BMP image with glTexImage2D() and I need black pixels to be shown as red. How can I do it? Any ideas?

[lobbel]

You can do that by a simple shader.



void main()
{
vec4 color = texture2D(myTexture, texCoord.xy);
if(color.rgb == vec3(0,0,0))
{
color.rgb = vec3(1,0,0);
}

gl_FragColor = color;
}


Or you can use oldstyle opengl colortable.

regards,
lobbel