+ if(b<0.0f)
+ throw invalid_argument("ShadowMap::set_depth_bias");
+
+ depth_bias = b;
+}
+
+void ShadowMap::setup_frame() const
+{
+ if(rendered)
+ return;
+
+ rendered = true;
+ renderable.setup_frame();
+
+ Camera camera;
+ const Vector4 &lpos = light.get_position();
+ /* XXX Not really proper way to support positional lights, but good
+ enough when the light source is far away */
+ camera.set_look_direction(lpos.w*target-lpos.slice<3>(0));
+
+ camera.set_up_direction((abs(camera.get_look_direction().z)<0.99) ? Vector3(0, 0, 1) : Vector3(0, 1, 0));
+ camera.set_position(target);
+ camera.set_orthographic(radius*2, radius*2);
+ camera.set_depth_clip(-radius, radius);
+
+ shadow_matrix = camera.get_object_matrix();
+ shadow_matrix.scale(radius*2, radius*2, -radius*2);
+ shadow_matrix.translate(-0.5, -0.5, depth_bias/size-0.5);
+ shadow_matrix.invert();
+
+ BindRestore bind_fbo(fbo);
+ Bind bind_depth(DepthTest::lequal());
+ fbo.clear(DEPTH_BUFFER_BIT);
+
+ Renderer renderer(&camera);
+ renderable.render(renderer, "shadow");
+}
+
+void ShadowMap::finish_frame() const
+{
+ renderable.finish_frame();
+ rendered = false;
+}
+
+void ShadowMap::render(Renderer &renderer, const Tag &tag) const
+{
+ if(!enabled_passes.count(tag))
+ return renderer.render(renderable, tag);
+
+ Renderer::Push _push_rend(renderer);
+
+ unsigned unit = renderer.allocate_effect_texunit();
+ int iunit = unit;
+ shdata.uniform("shadow", iunit);
+
+ Bind _bind_depth(depth_buf, unit);
+
+ if(const Camera *camera = renderer.get_camera())
+ /* Multiply by camera's object matrix to form a matrix that transforms
+ from eye space to shadow space. */
+ shdata.uniform("shd_eye_matrix", shadow_matrix*camera->get_object_matrix());
+ else
+ shdata.uniform("shd_eye_matrix", shadow_matrix);
+
+ renderer.add_shader_data(shdata);
+ renderer.render(renderable, tag);