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glt/zplane.cpp

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#include "zplane.h"

#include <glt/viewport.h>
#include <math/real.h>

void 
drawZat(const GLdouble z)
{
    glPushAttrib(GL_ENABLE_BIT);

        glDisable(GL_LIGHTING);

        GltViewport viewport(true);

        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glOrtho(0,viewport.width(),0,viewport.height(),0,1);

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();

        glTranslated(0,0,-CLAMP(z,0.0,1.0));
        viewport.drawQuad();

        glPopMatrix();
        glMatrixMode(GL_PROJECTION);
        glPopMatrix();
        glMatrixMode(GL_MODELVIEW);

    glPopAttrib();
}

void 
drawZnear()
{
    drawZat(0.0);
}

void 
drawZfar()
{
    drawZat(1.0);
}

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