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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2005 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
#include "../node_shader_util.h"
/* **************** Layer Weight ******************** */
static bNodeSocketTemplate sh_node_layer_weight_in[] = {
{ SOCK_FLOAT, 1, N_("Blend"), 0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
{ SOCK_VECTOR, 1, N_("Normal"), 0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f, PROP_NONE, SOCK_HIDE_VALUE},
{ -1, 0, "" }
};
static bNodeSocketTemplate sh_node_layer_weight_out[] = {
{ SOCK_FLOAT, 0, N_("Fresnel"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
{ SOCK_FLOAT, 0, N_("Facing"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
{ -1, 0, "" }
};
static int node_shader_gpu_layer_weight(GPUMaterial *mat, bNode *UNUSED(node), bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
{
if (!in[1].link)
in[1].link = GPU_builtin(GPU_VIEW_NORMAL);
else if (GPU_material_use_world_space_shading(mat)) {
GPU_link(mat, "direction_transform_m4v3", in[1].link, GPU_builtin(GPU_VIEW_MATRIX), &in[1].link);
}
return GPU_stack_link(mat, "node_layer_weight", in, out, GPU_builtin(GPU_VIEW_POSITION));
}
static void node_shader_exec_layer_weight(void *data, int UNUSED(thread), bNode *node, bNodeExecData *UNUSED(execdata), bNodeStack **in, bNodeStack **out)
{
ShadeInput *shi = ((ShaderCallData *)data)->shi;
/* Compute IOR. */
float blend;
nodestack_get_vec(&blend, SOCK_FLOAT, in[0]);
float eta = max_ff(1 - blend, 0.00001);
eta = shi->flippednor ? eta : 1 / eta;
/* Get normal from socket, but only if linked. */
bNodeSocket *sock_normal = node->inputs.first;
sock_normal = sock_normal->next;
float n[3];
if (sock_normal->link) {
nodestack_get_vec(n, SOCK_VECTOR, in[1]);
}
else {
copy_v3_v3(n, shi->vn);
}
if (shi->use_world_space_shading)
mul_mat3_m4_v3((float (*)[4])RE_render_current_get_matrix(RE_VIEW_MATRIX), n);
out[0]->vec[0] = RE_fresnel_dielectric(shi->view, n, eta);
float facing = fabs(dot_v3v3(shi->view, n));
if (blend != 0.5) {
CLAMP(blend, 0.0, 0.99999);
blend = (blend < 0.5) ? 2.0 * blend : 0.5 / (1.0 - blend);
facing = pow(facing, blend);
}
out[1]->vec[0] = 1.0 - facing;
}
/* node type definition */
void register_node_type_sh_layer_weight(void)
{
static bNodeType ntype;
sh_node_type_base(&ntype, SH_NODE_LAYER_WEIGHT, "Layer Weight", NODE_CLASS_INPUT, 0);
node_type_compatibility(&ntype, NODE_NEW_SHADING | NODE_OLD_SHADING);
node_type_socket_templates(&ntype, sh_node_layer_weight_in, sh_node_layer_weight_out);
node_type_init(&ntype, NULL);
node_type_storage(&ntype, "", NULL, NULL);
node_type_gpu(&ntype, node_shader_gpu_layer_weight);
node_type_exec(&ntype, NULL, NULL, node_shader_exec_layer_weight);
nodeRegisterType(&ntype);
}
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