- {
- float d = sqrt(lpos.x*lpos.x+lpos.y*lpos.y);
- matrix[0] = -lpos.y/d;
- matrix[4] = lpos.x/d;
- matrix[8] = 0;
- matrix[1] = -lpos.x*lpos.z/d;
- matrix[5] = -lpos.y*lpos.z/d;
- matrix[9] = d;
- }
-
- matrix[2] = lpos.x;
- matrix[6] = lpos.y;
- matrix[10] = lpos.z;
-
- matrix[12] = -(target.x*matrix[0]+target.y*matrix[4]+target.z*matrix[8]);
- matrix[13] = -(target.x*matrix[1]+target.y*matrix[5]+target.z*matrix[9]);
- matrix[14] = -(target.x*matrix[2]+target.y*matrix[6]+target.z*matrix[10]);
- matrix[3] = 0;
- matrix[7] = 0;
- matrix[11] = 0;
- matrix[15] = 1;
-
- renderer.escape();
-
- {
- MatrixStack::Push push_mv(MatrixStack::modelview());
- MatrixStack::Push push_proj(MatrixStack::projection());
-
- MatrixStack::projection() = Matrix::ortho(-radius, radius, -radius, radius, -radius, radius);
- MatrixStack::modelview() = matrix;
-
- Bind bind_fbo(fbo, true);
- fbo.clear(DEPTH_BUFFER_BIT);
- renderable.render("shadow");
- }
-
- // Has side effect of changing the current unit
- depth_buf.bind_to(unit);
- float diam = radius*2;
- TexGen tg_s, tg_t, tg_r;
- tg_s.set_plane(Vector4(matrix[0]/diam, matrix[4]/diam, matrix[8]/diam, matrix[12]/diam+0.5f));
- tg_t.set_plane(Vector4(matrix[1]/diam, matrix[5]/diam, matrix[9]/diam, matrix[13]/diam+0.5f));
- tg_r.set_plane(Vector4(-matrix[2]/diam, -matrix[6]/diam, -matrix[10]/diam, 0.5f-matrix[14]/diam-4.0f/size));
- tg_s.bind_to(SCOORD);
- tg_t.bind_to(TCOORD);
- tg_r.bind_to(RCOORD);
- TexUnit::activate(0);
-
- renderable.render(renderer, tag);
-
- Texture::unbind_from(unit);
- TexGen::unbind_from(SCOORD);
- TexGen::unbind_from(TCOORD);
- TexGen::unbind_from(RCOORD);
- TexUnit::activate(0);