diff options
Diffstat (limited to 'intern/cycles/render/graph.cpp')
| -rw-r--r-- | intern/cycles/render/graph.cpp | 1239 |
1 files changed, 0 insertions, 1239 deletions
diff --git a/intern/cycles/render/graph.cpp b/intern/cycles/render/graph.cpp deleted file mode 100644 index ee1a6e68bcf..00000000000 --- a/intern/cycles/render/graph.cpp +++ /dev/null @@ -1,1239 +0,0 @@ -/* - * Copyright 2011-2016 Blender Foundation - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "render/graph.h" -#include "render/attribute.h" -#include "render/constant_fold.h" -#include "render/nodes.h" -#include "render/scene.h" -#include "render/shader.h" - -#include "util/util_algorithm.h" -#include "util/util_foreach.h" -#include "util/util_logging.h" -#include "util/util_md5.h" -#include "util/util_queue.h" - -CCL_NAMESPACE_BEGIN - -namespace { - -bool check_node_inputs_has_links(const ShaderNode *node) -{ - foreach (const ShaderInput *in, node->inputs) { - if (in->link) { - return true; - } - } - return false; -} - -bool check_node_inputs_traversed(const ShaderNode *node, const ShaderNodeSet &done) -{ - foreach (const ShaderInput *in, node->inputs) { - if (in->link) { - if (done.find(in->link->parent) == done.end()) { - return false; - } - } - } - return true; -} - -} /* namespace */ - -/* Sockets */ - -void ShaderInput::disconnect() -{ - if (link) { - link->links.erase(remove(link->links.begin(), link->links.end(), this), link->links.end()); - } - link = NULL; -} - -void ShaderOutput::disconnect() -{ - foreach (ShaderInput *sock, links) { - sock->link = NULL; - } - - links.clear(); -} - -/* Node */ - -ShaderNode::ShaderNode(const NodeType *type) : Node(type) -{ - name = type->name; - id = -1; - bump = SHADER_BUMP_NONE; - special_type = SHADER_SPECIAL_TYPE_NONE; - - create_inputs_outputs(type); -} - -ShaderNode::~ShaderNode() -{ - foreach (ShaderInput *socket, inputs) - delete socket; - - foreach (ShaderOutput *socket, outputs) - delete socket; -} - -void ShaderNode::create_inputs_outputs(const NodeType *type) -{ - foreach (const SocketType &socket, type->inputs) { - if (socket.flags & SocketType::LINKABLE) { - inputs.push_back(new ShaderInput(socket, this)); - } - } - - foreach (const SocketType &socket, type->outputs) { - outputs.push_back(new ShaderOutput(socket, this)); - } -} - -ShaderInput *ShaderNode::input(const char *name) -{ - foreach (ShaderInput *socket, inputs) { - if (socket->name() == name) - return socket; - } - - return NULL; -} - -ShaderOutput *ShaderNode::output(const char *name) -{ - foreach (ShaderOutput *socket, outputs) - if (socket->name() == name) - return socket; - - return NULL; -} - -ShaderInput *ShaderNode::input(ustring name) -{ - foreach (ShaderInput *socket, inputs) { - if (socket->name() == name) - return socket; - } - - return NULL; -} - -ShaderOutput *ShaderNode::output(ustring name) -{ - foreach (ShaderOutput *socket, outputs) - if (socket->name() == name) - return socket; - - return NULL; -} - -void ShaderNode::remove_input(ShaderInput *input) -{ - assert(input->link == NULL); - delete input; - inputs.erase(remove(inputs.begin(), inputs.end(), input), inputs.end()); -} - -void ShaderNode::attributes(Shader *shader, AttributeRequestSet *attributes) -{ - foreach (ShaderInput *input, inputs) { - if (!input->link) { - if (input->flags() & SocketType::LINK_TEXTURE_GENERATED) { - if (shader->has_surface_link()) - attributes->add(ATTR_STD_GENERATED); - if (shader->has_volume) - attributes->add(ATTR_STD_GENERATED_TRANSFORM); - } - else if (input->flags() & SocketType::LINK_TEXTURE_UV) { - if (shader->has_surface_link()) - attributes->add(ATTR_STD_UV); - } - } - } -} - -bool ShaderNode::equals(const ShaderNode &other) -{ - if (type != other.type || bump != other.bump) { - return false; - } - - assert(inputs.size() == other.inputs.size()); - - /* Compare unlinkable sockets */ - foreach (const SocketType &socket, type->inputs) { - if (!(socket.flags & SocketType::LINKABLE)) { - if (!Node::equals_value(other, socket)) { - return false; - } - } - } - - /* Compare linkable input sockets */ - for (int i = 0; i < inputs.size(); ++i) { - ShaderInput *input_a = inputs[i], *input_b = other.inputs[i]; - if (input_a->link == NULL && input_b->link == NULL) { - /* Unconnected inputs are expected to have the same value. */ - if (!Node::equals_value(other, input_a->socket_type)) { - return false; - } - } - else if (input_a->link != NULL && input_b->link != NULL) { - /* Expect links are to come from the same exact socket. */ - if (input_a->link != input_b->link) { - return false; - } - } - else { - /* One socket has a link and another has not, inputs can't be - * considered equal. - */ - return false; - } - } - - return true; -} - -/* Graph */ - -ShaderGraph::ShaderGraph() -{ - finalized = false; - simplified = false; - num_node_ids = 0; - add(create_node<OutputNode>()); -} - -ShaderGraph::~ShaderGraph() -{ - clear_nodes(); -} - -ShaderNode *ShaderGraph::add(ShaderNode *node) -{ - assert(!finalized); - simplified = false; - - node->id = num_node_ids++; - nodes.push_back(node); - return node; -} - -OutputNode *ShaderGraph::output() -{ - return (OutputNode *)nodes.front(); -} - -void ShaderGraph::connect(ShaderOutput *from, ShaderInput *to) -{ - assert(!finalized); - assert(from && to); - - if (to->link) { - fprintf(stderr, "Cycles shader graph connect: input already connected.\n"); - return; - } - - if (from->type() != to->type()) { - /* can't do automatic conversion from closure */ - if (from->type() == SocketType::CLOSURE) { - fprintf(stderr, - "Cycles shader graph connect: can only connect closure to closure " - "(%s.%s to %s.%s).\n", - from->parent->name.c_str(), - from->name().c_str(), - to->parent->name.c_str(), - to->name().c_str()); - return; - } - - /* add automatic conversion node in case of type mismatch */ - ShaderNode *convert; - ShaderInput *convert_in; - - if (to->type() == SocketType::CLOSURE) { - EmissionNode *emission = create_node<EmissionNode>(); - emission->set_color(one_float3()); - emission->set_strength(1.0f); - convert = add(emission); - /* Connect float inputs to Strength to save an additional Value->Color conversion. */ - if (from->type() == SocketType::FLOAT) { - convert_in = convert->input("Strength"); - } - else { - convert_in = convert->input("Color"); - } - } - else { - convert = add(create_node<ConvertNode>(from->type(), to->type(), true)); - convert_in = convert->inputs[0]; - } - - connect(from, convert_in); - connect(convert->outputs[0], to); - } - else { - /* types match, just connect */ - to->link = from; - from->links.push_back(to); - } -} - -void ShaderGraph::disconnect(ShaderOutput *from) -{ - assert(!finalized); - simplified = false; - - from->disconnect(); -} - -void ShaderGraph::disconnect(ShaderInput *to) -{ - assert(!finalized); - assert(to->link); - simplified = false; - - to->disconnect(); -} - -void ShaderGraph::relink(ShaderInput *from, ShaderInput *to) -{ - ShaderOutput *out = from->link; - if (out) { - disconnect(from); - connect(out, to); - } - to->parent->copy_value(to->socket_type, *(from->parent), from->socket_type); -} - -void ShaderGraph::relink(ShaderOutput *from, ShaderOutput *to) -{ - /* Copy because disconnect modifies this list. */ - vector<ShaderInput *> outputs = from->links; - - foreach (ShaderInput *sock, outputs) { - disconnect(sock); - if (to) - connect(to, sock); - } -} - -void ShaderGraph::relink(ShaderNode *node, ShaderOutput *from, ShaderOutput *to) -{ - simplified = false; - - /* Copy because disconnect modifies this list */ - vector<ShaderInput *> outputs = from->links; - - /* Bypass node by moving all links from "from" to "to" */ - foreach (ShaderInput *sock, node->inputs) { - if (sock->link) - disconnect(sock); - } - - foreach (ShaderInput *sock, outputs) { - disconnect(sock); - if (to) - connect(to, sock); - } -} - -void ShaderGraph::simplify(Scene *scene) -{ - if (!simplified) { - expand(); - default_inputs(scene->shader_manager->use_osl()); - clean(scene); - refine_bump_nodes(); - - simplified = true; - } -} - -void ShaderGraph::finalize(Scene *scene, bool do_bump, bool do_simplify, bool bump_in_object_space) -{ - /* before compiling, the shader graph may undergo a number of modifications. - * currently we set default geometry shader inputs, and create automatic bump - * from displacement. a graph can be finalized only once, and should not be - * modified afterwards. */ - - if (!finalized) { - simplify(scene); - - if (do_bump) - bump_from_displacement(bump_in_object_space); - - ShaderInput *surface_in = output()->input("Surface"); - ShaderInput *volume_in = output()->input("Volume"); - - /* todo: make this work when surface and volume closures are tangled up */ - - if (surface_in->link) - transform_multi_closure(surface_in->link->parent, NULL, false); - if (volume_in->link) - transform_multi_closure(volume_in->link->parent, NULL, true); - - finalized = true; - } - else if (do_simplify) { - simplify_settings(scene); - } -} - -void ShaderGraph::find_dependencies(ShaderNodeSet &dependencies, ShaderInput *input) -{ - /* find all nodes that this input depends on directly and indirectly */ - ShaderNode *node = (input->link) ? input->link->parent : NULL; - - if (node != NULL && dependencies.find(node) == dependencies.end()) { - foreach (ShaderInput *in, node->inputs) - find_dependencies(dependencies, in); - - dependencies.insert(node); - } -} - -void ShaderGraph::clear_nodes() -{ - foreach (ShaderNode *node, nodes) { - delete_node(node); - } - nodes.clear(); -} - -void ShaderGraph::copy_nodes(ShaderNodeSet &nodes, ShaderNodeMap &nnodemap) -{ - /* copy a set of nodes, and the links between them. the assumption is - * made that all nodes that inputs are linked to are in the set too. */ - - /* copy nodes */ - foreach (ShaderNode *node, nodes) { - ShaderNode *nnode = node->clone(this); - nnodemap[node] = nnode; - - /* create new inputs and outputs to recreate links and ensure - * that we still point to valid SocketType if the NodeType - * changed in cloning, as it does for OSL nodes */ - nnode->inputs.clear(); - nnode->outputs.clear(); - nnode->create_inputs_outputs(nnode->type); - } - - /* recreate links */ - foreach (ShaderNode *node, nodes) { - foreach (ShaderInput *input, node->inputs) { - if (input->link) { - /* find new input and output */ - ShaderNode *nfrom = nnodemap[input->link->parent]; - ShaderNode *nto = nnodemap[input->parent]; - ShaderOutput *noutput = nfrom->output(input->link->name()); - ShaderInput *ninput = nto->input(input->name()); - - /* connect */ - connect(noutput, ninput); - } - } - } -} - -/* Graph simplification */ -/* ******************** */ - -/* Remove proxy nodes. - * - * These only exists temporarily when exporting groups, and we must remove them - * early so that node->attributes() and default links do not see them. - */ -void ShaderGraph::remove_proxy_nodes() -{ - vector<bool> removed(num_node_ids, false); - bool any_node_removed = false; - - foreach (ShaderNode *node, nodes) { - if (node->special_type == SHADER_SPECIAL_TYPE_PROXY) { - ConvertNode *proxy = static_cast<ConvertNode *>(node); - ShaderInput *input = proxy->inputs[0]; - ShaderOutput *output = proxy->outputs[0]; - - /* bypass the proxy node */ - if (input->link) { - relink(proxy, output, input->link); - } - else { - /* Copy because disconnect modifies this list */ - vector<ShaderInput *> links(output->links); - - foreach (ShaderInput *to, links) { - /* Remove any auto-convert nodes too if they lead to - * sockets with an automatically set default value. */ - ShaderNode *tonode = to->parent; - - if (tonode->special_type == SHADER_SPECIAL_TYPE_AUTOCONVERT) { - bool all_links_removed = true; - vector<ShaderInput *> links = tonode->outputs[0]->links; - - foreach (ShaderInput *autoin, links) { - if (autoin->flags() & SocketType::DEFAULT_LINK_MASK) - disconnect(autoin); - else - all_links_removed = false; - } - - if (all_links_removed) - removed[tonode->id] = true; - } - - disconnect(to); - - /* transfer the default input value to the target socket */ - tonode->copy_value(to->socket_type, *proxy, input->socket_type); - } - } - - removed[proxy->id] = true; - any_node_removed = true; - } - } - - /* remove nodes */ - if (any_node_removed) { - list<ShaderNode *> newnodes; - - foreach (ShaderNode *node, nodes) { - if (!removed[node->id]) - newnodes.push_back(node); - else - delete_node(node); - } - - nodes = newnodes; - } -} - -/* Constant folding. - * - * Try to constant fold some nodes, and pipe result directly to - * the input socket of connected nodes. - */ -void ShaderGraph::constant_fold(Scene *scene) -{ - ShaderNodeSet done, scheduled; - queue<ShaderNode *> traverse_queue; - - bool has_displacement = (output()->input("Displacement")->link != NULL); - - /* Schedule nodes which doesn't have any dependencies. */ - foreach (ShaderNode *node, nodes) { - if (!check_node_inputs_has_links(node)) { - traverse_queue.push(node); - scheduled.insert(node); - } - } - - while (!traverse_queue.empty()) { - ShaderNode *node = traverse_queue.front(); - traverse_queue.pop(); - done.insert(node); - foreach (ShaderOutput *output, node->outputs) { - if (output->links.size() == 0) { - continue; - } - /* Schedule node which was depending on the value, - * when possible. Do it before disconnect. - */ - foreach (ShaderInput *input, output->links) { - if (scheduled.find(input->parent) != scheduled.end()) { - /* Node might not be optimized yet but scheduled already - * by other dependencies. No need to re-schedule it. - */ - continue; - } - /* Schedule node if its inputs are fully done. */ - if (check_node_inputs_traversed(input->parent, done)) { - traverse_queue.push(input->parent); - scheduled.insert(input->parent); - } - } - /* Optimize current node. */ - ConstantFolder folder(this, node, output, scene); - node->constant_fold(folder); - } - } - - /* Folding might have removed all nodes connected to the displacement output - * even tho there is displacement to be applied, so add in a value node if - * that happens to ensure there is still a valid graph for displacement. - */ - if (has_displacement && !output()->input("Displacement")->link) { - ColorNode *value = (ColorNode *)add(create_node<ColorNode>()); - value->set_value(output()->get_displacement()); - - connect(value->output("Color"), output()->input("Displacement")); - } -} - -/* Simplification. */ -void ShaderGraph::simplify_settings(Scene *scene) -{ - foreach (ShaderNode *node, nodes) { - node->simplify_settings(scene); - } -} - -/* Deduplicate nodes with same settings. */ -void ShaderGraph::deduplicate_nodes() -{ - /* NOTES: - * - Deduplication happens for nodes which has same exact settings and same - * exact input links configuration (either connected to same output or has - * the same exact default value). - * - Deduplication happens in the bottom-top manner, so we know for fact that - * all traversed nodes are either can not be deduplicated at all or were - * already deduplicated. - */ - - ShaderNodeSet scheduled, done; - map<ustring, ShaderNodeSet> candidates; - queue<ShaderNode *> traverse_queue; - int num_deduplicated = 0; - - /* Schedule nodes which doesn't have any dependencies. */ - foreach (ShaderNode *node, nodes) { - if (!check_node_inputs_has_links(node)) { - traverse_queue.push(node); - scheduled.insert(node); - } - } - - while (!traverse_queue.empty()) { - ShaderNode *node = traverse_queue.front(); - traverse_queue.pop(); - done.insert(node); - /* Schedule the nodes which were depending on the current node. */ - bool has_output_links = false; - foreach (ShaderOutput *output, node->outputs) { - foreach (ShaderInput *input, output->links) { - has_output_links = true; - if (scheduled.find(input->parent) != scheduled.end()) { - /* Node might not be optimized yet but scheduled already - * by other dependencies. No need to re-schedule it. - */ - continue; - } - /* Schedule node if its inputs are fully done. */ - if (check_node_inputs_traversed(input->parent, done)) { - traverse_queue.push(input->parent); - scheduled.insert(input->parent); - } - } - } - /* Only need to care about nodes that are actually used */ - if (!has_output_links) { - continue; - } - /* Try to merge this node with another one. */ - ShaderNode *merge_with = NULL; - foreach (ShaderNode *other_node, candidates[node->type->name]) { - if (node != other_node && node->equals(*other_node)) { - merge_with = other_node; - break; - } - } - /* If found an equivalent, merge; otherwise keep node for later merges */ - if (merge_with != NULL) { - for (int i = 0; i < node->outputs.size(); ++i) { - relink(node, node->outputs[i], merge_with->outputs[i]); - } - num_deduplicated++; - } - else { - candidates[node->type->name].insert(node); - } - } - - if (num_deduplicated > 0) { - VLOG(1) << "Deduplicated " << num_deduplicated << " nodes."; - } -} - -/* Check whether volume output has meaningful nodes, otherwise - * disconnect the output. - */ -void ShaderGraph::verify_volume_output() -{ - /* Check whether we can optimize the whole volume graph out. */ - ShaderInput *volume_in = output()->input("Volume"); - if (volume_in->link == NULL) { - return; - } - bool has_valid_volume = false; - ShaderNodeSet scheduled; - queue<ShaderNode *> traverse_queue; - /* Schedule volume output. */ - traverse_queue.push(volume_in->link->parent); - scheduled.insert(volume_in->link->parent); - /* Traverse down the tree. */ - while (!traverse_queue.empty()) { - ShaderNode *node = traverse_queue.front(); - traverse_queue.pop(); - /* Node is fully valid for volume, can't optimize anything out. */ - if (node->has_volume_support()) { - has_valid_volume = true; - break; - } - foreach (ShaderInput *input, node->inputs) { - if (input->link == NULL) { - continue; - } - if (scheduled.find(input->link->parent) != scheduled.end()) { - continue; - } - traverse_queue.push(input->link->parent); - scheduled.insert(input->link->parent); - } - } - if (!has_valid_volume) { - VLOG(1) << "Disconnect meaningless volume output."; - disconnect(volume_in->link); - } -} - -void ShaderGraph::break_cycles(ShaderNode *node, vector<bool> &visited, vector<bool> &on_stack) -{ - visited[node->id] = true; - on_stack[node->id] = true; - - foreach (ShaderInput *input, node->inputs) { - if (input->link) { - ShaderNode *depnode = input->link->parent; - - if (on_stack[depnode->id]) { - /* break cycle */ - disconnect(input); - fprintf(stderr, "Cycles shader graph: detected cycle in graph, connection removed.\n"); - } - else if (!visited[depnode->id]) { - /* visit dependencies */ - break_cycles(depnode, visited, on_stack); - } - } - } - - on_stack[node->id] = false; -} - -void ShaderGraph::compute_displacement_hash() -{ - /* Compute hash of all nodes linked to displacement, to detect if we need - * to recompute displacement when shader nodes change. */ - ShaderInput *displacement_in = output()->input("Displacement"); - - if (!displacement_in->link) { - displacement_hash = ""; - return; - } - - ShaderNodeSet nodes_displace; - find_dependencies(nodes_displace, displacement_in); - - MD5Hash md5; - foreach (ShaderNode *node, nodes_displace) { - node->hash(md5); - foreach (ShaderInput *input, node->inputs) { - int link_id = (input->link) ? input->link->parent->id : 0; - md5.append((uint8_t *)&link_id, sizeof(link_id)); - md5.append((input->link) ? input->link->name().c_str() : ""); - } - - if (node->special_type == SHADER_SPECIAL_TYPE_OSL) { - /* Hash takes into account socket values, to detect changes - * in the code of the node we need an exception. */ - OSLNode *oslnode = static_cast<OSLNode *>(node); - md5.append(oslnode->bytecode_hash); - } - } - - displacement_hash = md5.get_hex(); -} - -void ShaderGraph::clean(Scene *scene) -{ - /* Graph simplification */ - - /* NOTE: Remove proxy nodes was already done. */ - constant_fold(scene); - simplify_settings(scene); - deduplicate_nodes(); - verify_volume_output(); - - /* we do two things here: find cycles and break them, and remove unused - * nodes that don't feed into the output. how cycles are broken is - * undefined, they are invalid input, the important thing is to not crash */ - - vector<bool> visited(num_node_ids, false); - vector<bool> on_stack(num_node_ids, false); - - /* break cycles */ - break_cycles(output(), visited, on_stack); - foreach (ShaderNode *node, nodes) { - if (node->special_type == SHADER_SPECIAL_TYPE_OUTPUT_AOV) { - break_cycles(node, visited, on_stack); - } - } - - /* disconnect unused nodes */ - foreach (ShaderNode *node, nodes) { - if (!visited[node->id]) { - foreach (ShaderInput *to, node->inputs) { - ShaderOutput *from = to->link; - - if (from) { - to->link = NULL; - from->links.erase(remove(from->links.begin(), from->links.end(), to), from->links.end()); - } - } - } - } - - /* remove unused nodes */ - list<ShaderNode *> newnodes; - - foreach (ShaderNode *node, nodes) { - if (visited[node->id]) - newnodes.push_back(node); - else - delete_node(node); - } - - nodes = newnodes; -} - -void ShaderGraph::expand() -{ - /* Call expand on all nodes, to generate additional nodes. */ - foreach (ShaderNode *node, nodes) { - node->expand(this); - } -} - -void ShaderGraph::default_inputs(bool do_osl) -{ - /* nodes can specify default texture coordinates, for now we give - * everything the position by default, except for the sky texture */ - - ShaderNode *geom = NULL; - ShaderNode *texco = NULL; - - foreach (ShaderNode *node, nodes) { - foreach (ShaderInput *input, node->inputs) { - if (!input->link && (!(input->flags() & SocketType::OSL_INTERNAL) || do_osl)) { - if (input->flags() & SocketType::LINK_TEXTURE_GENERATED) { - if (!texco) - texco = create_node<TextureCoordinateNode>(); - - connect(texco->output("Generated"), input); - } - if (input->flags() & SocketType::LINK_TEXTURE_NORMAL) { - if (!texco) - texco = create_node<TextureCoordinateNode>(); - - connect(texco->output("Normal"), input); - } - else if (input->flags() & SocketType::LINK_TEXTURE_UV) { - if (!texco) - texco = create_node<TextureCoordinateNode>(); - - connect(texco->output("UV"), input); - } - else if (input->flags() & SocketType::LINK_INCOMING) { - if (!geom) - geom = create_node<GeometryNode>(); - - connect(geom->output("Incoming"), input); - } - else if (input->flags() & SocketType::LINK_NORMAL) { - if (!geom) - geom = create_node<GeometryNode>(); - - connect(geom->output("Normal"), input); - } - else if (input->flags() & SocketType::LINK_POSITION) { - if (!geom) - geom = create_node<GeometryNode>(); - - connect(geom->output("Position"), input); - } - else if (input->flags() & SocketType::LINK_TANGENT) { - if (!geom) - geom = create_node<GeometryNode>(); - - connect(geom->output("Tangent"), input); - } - } - } - } - - if (geom) - add(geom); - if (texco) - add(texco); -} - -void ShaderGraph::refine_bump_nodes() -{ - /* we transverse the node graph looking for bump nodes, when we find them, - * like in bump_from_displacement(), we copy the sub-graph defined from "bump" - * input to the inputs "center","dx" and "dy" What is in "bump" input is moved - * to "center" input. */ - - foreach (ShaderNode *node, nodes) { - if (node->special_type == SHADER_SPECIAL_TYPE_BUMP && node->input("Height")->link) { - ShaderInput *bump_input = node->input("Height"); - ShaderNodeSet nodes_bump; - - /* make 2 extra copies of the subgraph defined in Bump input */ - ShaderNodeMap nodes_dx; - ShaderNodeMap nodes_dy; - - /* find dependencies for the given input */ - find_dependencies(nodes_bump, bump_input); - - copy_nodes(nodes_bump, nodes_dx); - copy_nodes(nodes_bump, nodes_dy); - - /* mark nodes to indicate they are use for bump computation, so - that any texture coordinates are shifted by dx/dy when sampling */ - foreach (ShaderNode *node, nodes_bump) - node->bump = SHADER_BUMP_CENTER; - foreach (NodePair &pair, nodes_dx) - pair.second->bump = SHADER_BUMP_DX; - foreach (NodePair &pair, nodes_dy) - pair.second->bump = SHADER_BUMP_DY; - - ShaderOutput *out = bump_input->link; - ShaderOutput *out_dx = nodes_dx[out->parent]->output(out->name()); - ShaderOutput *out_dy = nodes_dy[out->parent]->output(out->name()); - - connect(out_dx, node->input("SampleX")); - connect(out_dy, node->input("SampleY")); - - /* add generated nodes */ - foreach (NodePair &pair, nodes_dx) - add(pair.second); - foreach (NodePair &pair, nodes_dy) - add(pair.second); - - /* Connect what is connected is bump to sample-center input. */ - connect(out, node->input("SampleCenter")); - - /* Bump input is just for connectivity purpose for the graph input, - * we re-connected this input to sample-center, so lets disconnect it - * from bump input. */ - disconnect(bump_input); - } - } -} - -void ShaderGraph::bump_from_displacement(bool use_object_space) -{ - /* generate bump mapping automatically from displacement. bump mapping is - * done using a 3-tap filter, computing the displacement at the center, - * and two other positions shifted by ray differentials. - * - * since the input to displacement is a node graph, we need to ensure that - * all texture coordinates use are shift by the ray differentials. for this - * reason we make 3 copies of the node subgraph defining the displacement, - * with each different geometry and texture coordinate nodes that generate - * different shifted coordinates. - * - * these 3 displacement values are then fed into the bump node, which will - * output the perturbed normal. */ - - ShaderInput *displacement_in = output()->input("Displacement"); - - if (!displacement_in->link) - return; - - /* find dependencies for the given input */ - ShaderNodeSet nodes_displace; - find_dependencies(nodes_displace, displacement_in); - - /* copy nodes for 3 bump samples */ - ShaderNodeMap nodes_center; - ShaderNodeMap nodes_dx; - ShaderNodeMap nodes_dy; - - copy_nodes(nodes_displace, nodes_center); - copy_nodes(nodes_displace, nodes_dx); - copy_nodes(nodes_displace, nodes_dy); - - /* mark nodes to indicate they are use for bump computation, so - * that any texture coordinates are shifted by dx/dy when sampling */ - foreach (NodePair &pair, nodes_center) - pair.second->bump = SHADER_BUMP_CENTER; - foreach (NodePair &pair, nodes_dx) - pair.second->bump = SHADER_BUMP_DX; - foreach (NodePair &pair, nodes_dy) - pair.second->bump = SHADER_BUMP_DY; - - /* add set normal node and connect the bump normal output to the set normal - * output, so it can finally set the shader normal, note we are only doing - * this for bump from displacement, this will be the only bump allowed to - * overwrite the shader normal */ - ShaderNode *set_normal = add(create_node<SetNormalNode>()); - - /* add bump node and connect copied graphs to it */ - BumpNode *bump = (BumpNode *)add(create_node<BumpNode>()); - bump->set_use_object_space(use_object_space); - bump->set_distance(1.0f); - - ShaderOutput *out = displacement_in->link; - ShaderOutput *out_center = nodes_center[out->parent]->output(out->name()); - ShaderOutput *out_dx = nodes_dx[out->parent]->output(out->name()); - ShaderOutput *out_dy = nodes_dy[out->parent]->output(out->name()); - - /* convert displacement vector to height */ - VectorMathNode *dot_center = (VectorMathNode *)add(create_node<VectorMathNode>()); - VectorMathNode *dot_dx = (VectorMathNode *)add(create_node<VectorMathNode>()); - VectorMathNode *dot_dy = (VectorMathNode *)add(create_node<VectorMathNode>()); - - dot_center->set_math_type(NODE_VECTOR_MATH_DOT_PRODUCT); - dot_dx->set_math_type(NODE_VECTOR_MATH_DOT_PRODUCT); - dot_dy->set_math_type(NODE_VECTOR_MATH_DOT_PRODUCT); - - GeometryNode *geom = (GeometryNode *)add(create_node<GeometryNode>()); - connect(geom->output("Normal"), dot_center->input("Vector2")); - connect(geom->output("Normal"), dot_dx->input("Vector2")); - connect(geom->output("Normal"), dot_dy->input("Vector2")); - - connect(out_center, dot_center->input("Vector1")); - connect(out_dx, dot_dx->input("Vector1")); - connect(out_dy, dot_dy->input("Vector1")); - - connect(dot_center->output("Value"), bump->input("SampleCenter")); - connect(dot_dx->output("Value"), bump->input("SampleX")); - connect(dot_dy->output("Value"), bump->input("SampleY")); - - /* connect the bump out to the set normal in: */ - connect(bump->output("Normal"), set_normal->input("Direction")); - - /* connect to output node */ - connect(set_normal->output("Normal"), output()->input("Normal")); - - /* finally, add the copied nodes to the graph. we can't do this earlier - * because we would create dependency cycles in the above loop */ - foreach (NodePair &pair, nodes_center) - add(pair.second); - foreach (NodePair &pair, nodes_dx) - add(pair.second); - foreach (NodePair &pair, nodes_dy) - add(pair.second); -} - -void ShaderGraph::transform_multi_closure(ShaderNode *node, ShaderOutput *weight_out, bool volume) -{ - /* for SVM in multi closure mode, this transforms the shader mix/add part of - * the graph into nodes that feed weights into closure nodes. this is too - * avoid building a closure tree and then flattening it, and instead write it - * directly to an array */ - - if (node->special_type == SHADER_SPECIAL_TYPE_COMBINE_CLOSURE) { - ShaderInput *fin = node->input("Fac"); - ShaderInput *cl1in = node->input("Closure1"); - ShaderInput *cl2in = node->input("Closure2"); - ShaderOutput *weight1_out, *weight2_out; - - if (fin) { - /* mix closure: add node to mix closure weights */ - MixClosureWeightNode *mix_node = create_node<MixClosureWeightNode>(); - add(mix_node); - ShaderInput *fac_in = mix_node->input("Fac"); - ShaderInput *weight_in = mix_node->input("Weight"); - - if (fin->link) - connect(fin->link, fac_in); - else - mix_node->set_fac(node->get_float(fin->socket_type)); - - if (weight_out) - connect(weight_out, weight_in); - - weight1_out = mix_node->output("Weight1"); - weight2_out = mix_node->output("Weight2"); - } - else { - /* add closure: just pass on any weights */ - weight1_out = weight_out; - weight2_out = weight_out; - } - - if (cl1in->link) - transform_multi_closure(cl1in->link->parent, weight1_out, volume); - if (cl2in->link) - transform_multi_closure(cl2in->link->parent, weight2_out, volume); - } - else { - ShaderInput *weight_in = node->input((volume) ? "VolumeMixWeight" : "SurfaceMixWeight"); - - /* not a closure node? */ - if (!weight_in) - return; - - /* already has a weight connected to it? add weights */ - float weight_value = node->get_float(weight_in->socket_type); - if (weight_in->link || weight_value != 0.0f) { - MathNode *math_node = create_node<MathNode>(); - add(math_node); - - if (weight_in->link) - connect(weight_in->link, math_node->input("Value1")); - else - math_node->set_value1(weight_value); - - if (weight_out) - connect(weight_out, math_node->input("Value2")); - else - math_node->set_value2(1.0f); - - weight_out = math_node->output("Value"); - if (weight_in->link) - disconnect(weight_in); - } - - /* connected to closure mix weight */ - if (weight_out) - connect(weight_out, weight_in); - else - node->set(weight_in->socket_type, weight_value + 1.0f); - } -} - -int ShaderGraph::get_num_closures() -{ - int num_closures = 0; - foreach (ShaderNode *node, nodes) { - ClosureType closure_type = node->get_closure_type(); - if (closure_type == CLOSURE_NONE_ID) { - continue; - } - else if (CLOSURE_IS_BSSRDF(closure_type)) { - num_closures += 3; - } - else if (CLOSURE_IS_GLASS(closure_type)) { - num_closures += 2; - } - else if (CLOSURE_IS_BSDF_MULTISCATTER(closure_type)) { - num_closures += 2; - } - else if (CLOSURE_IS_PRINCIPLED(closure_type)) { - num_closures += 8; - } - else if (CLOSURE_IS_VOLUME(closure_type)) { - /* TODO(sergey): Verify this is still needed, since we have special minimized volume storage - * for the volume steps. */ - num_closures += MAX_VOLUME_STACK_SIZE; - } - else if (closure_type == CLOSURE_BSDF_HAIR_PRINCIPLED_ID) { - num_closures += 4; - } - else { - ++num_closures; - } - } - return num_closures; -} - -void ShaderGraph::dump_graph(const char *filename) -{ - FILE *fd = fopen(filename, "w"); - - if (fd == NULL) { - printf("Error opening file for dumping the graph: %s\n", filename); - return; - } - - fprintf(fd, "digraph shader_graph {\n"); - fprintf(fd, "ranksep=1.5\n"); - fprintf(fd, "rankdir=LR\n"); - fprintf(fd, "splines=false\n"); - - foreach (ShaderNode *node, nodes) { - fprintf(fd, "// NODE: %p\n", node); - fprintf(fd, "\"%p\" [shape=record,label=\"{", node); - if (node->inputs.size()) { - fprintf(fd, "{"); - foreach (ShaderInput *socket, node->inputs) { - if (socket != node->inputs[0]) { - fprintf(fd, "|"); - } - fprintf(fd, "<IN_%p>%s", socket, socket->name().c_str()); - } - fprintf(fd, "}|"); - } - fprintf(fd, "%s", node->name.c_str()); - if (node->bump == SHADER_BUMP_CENTER) { - fprintf(fd, " (bump:center)"); - } - else if (node->bump == SHADER_BUMP_DX) { - fprintf(fd, " (bump:dx)"); - } - else if (node->bump == SHADER_BUMP_DY) { - fprintf(fd, " (bump:dy)"); - } - if (node->outputs.size()) { - fprintf(fd, "|{"); - foreach (ShaderOutput *socket, node->outputs) { - if (socket != node->outputs[0]) { - fprintf(fd, "|"); - } - fprintf(fd, "<OUT_%p>%s", socket, socket->name().c_str()); - } - fprintf(fd, "}"); - } - fprintf(fd, "}\"]"); - } - - foreach (ShaderNode *node, nodes) { - foreach (ShaderOutput *output, node->outputs) { - foreach (ShaderInput *input, output->links) { - fprintf(fd, - "// CONNECTION: OUT_%p->IN_%p (%s:%s)\n", - output, - input, - output->name().c_str(), - input->name().c_str()); - fprintf(fd, - "\"%p\":\"OUT_%p\":e -> \"%p\":\"IN_%p\":w [label=\"\"]\n", - output->parent, - output, - input->parent, - input); - } - } - } - - fprintf(fd, "}\n"); - fclose(fd); -} - -CCL_NAMESPACE_END |