void volume_render_brick(GLuint const geometry, Matrix const * inverse_modelview, Brick const * const brick)
{
Vector size = box_size(brick->box);
Vector tex_size = box_size(brick->tex);
GLfloat const texture_matrix[4][4] =
{
{tex_size.x / size.x, 0, 0, 0},
{0, tex_size.y / size.y, 0, 0},
{0, 0, tex_size.z / size.z, 0},
{brick->tex.min.x, brick->tex.min.y, brick->tex.min.z, 1}
};
GLdouble const clip_planes[6][4] =
{
{ 1, 0, 0, -brick->box.min.x},
{-1, 0, 0, brick->box.max.x},
{ 0, 1, 0, -brick->box.min.y},
{ 0,-1, 0, brick->box.max.y},
{ 0, 0, 1, -brick->box.min.z},
{ 0, 0,-1, brick->box.max.z}
};
glBindTexture(GL_TEXTURE_3D, brick->texture);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_BASE_LEVEL, brick->level);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAX_LEVEL, brick->level);
glMatrixMode(GL_TEXTURE);
glLoadMatrixf(&texture_matrix[0][0]);
glTranslatef(-brick->box.min.x, -brick->box.min.y, -brick->box.min.z); // move into texture_matrix
glMultMatrixf((GLfloat const *) inverse_modelview);
glMatrixMode(GL_MODELVIEW);
glClipPlane(GL_CLIP_PLANE0, clip_planes[0]);
glClipPlane(GL_CLIP_PLANE1, clip_planes[1]);
glClipPlane(GL_CLIP_PLANE2, clip_planes[2]);
glClipPlane(GL_CLIP_PLANE3, clip_planes[3]);
glClipPlane(GL_CLIP_PLANE4, clip_planes[4]);
glClipPlane(GL_CLIP_PLANE5, clip_planes[5]);
glCallList(geometry);
}
void gspline_update(t_gspline *x)
{
short oh,ow,nh,nw;
ow = x->x_boxwidth;
oh = x->x_boxheight;
nw = x->x_box.z_box.b_rect.right-x->x_box.z_box.b_rect.left;
nh = x->x_box.z_box.b_rect.bottom-x->x_box.z_box.b_rect.top;
if(nh != oh || nw != ow) {
nw = MIN(MAX(nw, MINWIDTH), MAXWIDTH); // constrain to min and max size
nh = MIN(MAX(nh, MINHEIGHT), MAXHEIGHT);
box_size(&x->x_box.z_box, nw, nh);
x->x_boxwidth = nw;
x->x_boxheight = nh;
}
gspline_redraw(x);
}
