inline bool
load_texture(TEXTUREglptr& tex)
{
// Load the texture (should be already allocated TEXTUREgl
// with filename set as member variable).
//
// Note: Does not activate the texture.
//
// This is a no-op of the texture was previously loaded.
if (!tex) {
return false;
} else if (tex->is_valid()) {
return true;
} else if (tex->load_attempt_failed()) {
// we previously tried to load this texture and failed.
// no sense trying again with the same filename.
return false;
}
return tex->load_texture();
}
void
SKY_BOX::test_perlin(CVIEWptr &v)
{
//test
if (!perlin_tex) {
perlin_tex = make_shared<TEXTUREgl>(
Config::JOT_ROOT() +
"nprdata/other_textures/" +
"perlin_tex_RGB.png"
);
perlin_tex->load_texture();
}
assert(perlin_tex);
if (perlin_tex->load_attempt_failed()) {
cerr << "SKY_BOX::test_perlin: could not load file: "
<< perlin_tex->file()
<< endl;
return;
}
// load identity for model matrix
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
// set up to draw in XY coords:
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadMatrixd(VIEW::peek()->xypt_proj().transpose().matrix());
// set opengl state:
glPushAttrib(GL_ENABLE_BIT);
glDisable(GL_LIGHTING);
glEnable(GL_TEXTURE_2D);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST); // prevents depth testing AND writing to depth buffer
glDisable(GL_ALPHA_TEST);
//glDisable(GL_BLEND);
perlin_tex->apply_texture(); // GL_ENABLE_BIT
GLfloat a = 0.5f;
glColor4f(0.5, 0.5, 0.5, 1);
glBegin(GL_QUADS);
// draw vertices in CCW order starting at bottom left:
glTexCoord2f( 0, 0);
glVertex2f (-a, -a);
glTexCoord2f( 1, 0);
glVertex2f ( a, -a);
glTexCoord2f( 1, 1);
glVertex2f ( a, a);
glTexCoord2f( 0, 1);
glVertex2f (-a, a);
glEnd();
// restore state:
glPopAttrib();
// restore projection matrix
glMatrixMode(GL_PROJECTION);
glPopMatrix();
// restore modelview matrix
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
}
