void render_highpassfilter_noext (float threshold_R, float threshold_G, float threshold_B) {
// invert color buffer
glBlendFunc (GL_ONE_MINUS_DST_COLOR, GL_ZERO);
glColor4f (1,1,1,1);
screenquad ();
// add the threshold
glBlendFunc (GL_ONE, GL_ONE);
glColor4f (threshold_R, threshold_G, threshold_B, 1);
screenquad ();
// invert color buffer
glBlendFunc (GL_ONE_MINUS_DST_COLOR, GL_ZERO);
glColor4f (1,1,1,1);
screenquad ();
}
void render_highpassfilter_ext (float threshold_R, float threshold_G, float threshold_B) {
// substract the threshold
glBlendFunc (GL_ONE, GL_ONE);
glBlendEquationEXT (GL_FUNC_REVERSE_SUBTRACT_EXT);
glColor4f (threshold_R, threshold_G, threshold_B, 0);
screenquad ();
glBlendEquationEXT (GL_FUNC_ADD_EXT);
}
void addglare()
{
if(!glare) return;
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
SETSHADER(screenrect);
glBindTexture(GL_TEXTURE_2D, glaretex.rendertex);
gle::colorf(glarescale, glarescale, glarescale);
screenquad(1, 1);
glDisable(GL_BLEND);
}
