node_shader_geom.c

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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"

#include "DNA_customdata_types.h"

/* **************** GEOMETRY  ******************** */

/* output socket type definition */
static bNodeSocketTemplate sh_node_geom_out[]= {
    {   SOCK_VECTOR, 0, "Global"},
    {   SOCK_VECTOR, 0, "Local"},
    {   SOCK_VECTOR, 0, "View"},
    {   SOCK_VECTOR, 0, "Orco"},
    {   SOCK_VECTOR, 0, "UV"},
    {   SOCK_VECTOR, 0, "Normal"},
    {   SOCK_RGBA,   0, "Vertex Color"},
    {   SOCK_FLOAT,   0, "Vertex Alpha"},
    {   SOCK_FLOAT,   0, "Front/Back"},
    {   -1, 0, ""   }
};

/* node execute callback */
static void node_shader_exec_geom(void *data, bNode *node, bNodeStack **UNUSED(in), bNodeStack **out)
{
    if(data) {
        ShadeInput *shi= ((ShaderCallData *)data)->shi;
        NodeGeometry *ngeo= (NodeGeometry*)node->storage;
        ShadeInputUV *suv= &shi->uv[shi->actuv];
        static float defaultvcol[4] = {1.0f, 1.0f, 1.0f, 1.0f};
        int i;

        if(ngeo->uvname[0]) {
            /* find uv map by name */
            for(i = 0; i < shi->totuv; i++) {
                if(strcmp(shi->uv[i].name, ngeo->uvname)==0) {
                    suv= &shi->uv[i];
                    break;
                }
            }
        }

        /* out: global, local, view, orco, uv, normal, vertex color */
        copy_v3_v3(out[GEOM_OUT_GLOB]->vec, shi->gl);
        copy_v3_v3(out[GEOM_OUT_LOCAL]->vec, shi->co);
        copy_v3_v3(out[GEOM_OUT_VIEW]->vec, shi->view);
        copy_v3_v3(out[GEOM_OUT_ORCO]->vec, shi->lo);
        copy_v3_v3(out[GEOM_OUT_UV]->vec, suv->uv);
        copy_v3_v3(out[GEOM_OUT_NORMAL]->vec, shi->vno);

        if (shi->totcol) {
            /* find vertex color layer by name */
            ShadeInputCol *scol= &shi->col[0];

            if(ngeo->colname[0]) {
                for(i = 0; i < shi->totcol; i++) {
                    if(strcmp(shi->col[i].name, ngeo->colname)==0) {
                        scol= &shi->col[i];
                        break;
                    }
                }
            }

            copy_v3_v3(out[GEOM_OUT_VCOL]->vec, scol->col);
            out[GEOM_OUT_VCOL]->vec[3]= scol->col[3];
            out[GEOM_OUT_VCOL_ALPHA]->vec[0]= scol->col[3];
        }
        else  {
            memcpy(out[GEOM_OUT_VCOL]->vec, defaultvcol, sizeof(defaultvcol));
            out[GEOM_OUT_VCOL_ALPHA]->vec[0]= 1.0f;
        }
        
        if(shi->osatex) {
            out[GEOM_OUT_GLOB]->data= shi->dxgl;
            out[GEOM_OUT_GLOB]->datatype= NS_OSA_VECTORS;
            out[GEOM_OUT_LOCAL]->data= shi->dxco;
            out[GEOM_OUT_LOCAL]->datatype= NS_OSA_VECTORS;
            out[GEOM_OUT_VIEW]->data= &shi->dxview;
            out[GEOM_OUT_VIEW]->datatype= NS_OSA_VALUES;
            out[GEOM_OUT_ORCO]->data= shi->dxlo;
            out[GEOM_OUT_ORCO]->datatype= NS_OSA_VECTORS;
            out[GEOM_OUT_UV]->data= suv->dxuv;
            out[GEOM_OUT_UV]->datatype= NS_OSA_VECTORS;
            out[GEOM_OUT_NORMAL]->data= shi->dxno;
            out[GEOM_OUT_NORMAL]->datatype= NS_OSA_VECTORS;
        }
        
        /* front/back, normal flipping was stored */
        out[GEOM_OUT_FRONTBACK]->vec[0]= (shi->flippednor)? 0.0f: 1.0f;
    }
}

static void node_shader_init_geometry(bNodeTree *UNUSED(ntree), bNode* node, bNodeTemplate *UNUSED(ntemp))
{
    node->storage= MEM_callocN(sizeof(NodeGeometry), "NodeGeometry");
}

static int gpu_shader_geom(GPUMaterial *mat, bNode *node, GPUNodeStack *in, GPUNodeStack *out)
{
    NodeGeometry *ngeo= (NodeGeometry*)node->storage;
    GPUNodeLink *orco = GPU_attribute(CD_ORCO, "");
    GPUNodeLink *mtface = GPU_attribute(CD_MTFACE, ngeo->uvname);
    GPUNodeLink *mcol = GPU_attribute(CD_MCOL, ngeo->colname);

    return GPU_stack_link(mat, "geom", in, out,
        GPU_builtin(GPU_VIEW_POSITION), GPU_builtin(GPU_VIEW_NORMAL),
        GPU_builtin(GPU_INVERSE_VIEW_MATRIX), orco, mtface, mcol);
}

/* node type definition */
void register_node_type_sh_geom(bNodeTreeType *ttype)
{
    static bNodeType ntype;

    node_type_base(ttype, &ntype, SH_NODE_GEOMETRY, "Geometry", NODE_CLASS_INPUT, NODE_OPTIONS);
    node_type_compatibility(&ntype, NODE_OLD_SHADING);
    node_type_socket_templates(&ntype, NULL, sh_node_geom_out);
    node_type_size(&ntype, 120, 80, 160);
    node_type_init(&ntype, node_shader_init_geometry);
    node_type_storage(&ntype, "NodeGeometry", node_free_standard_storage, node_copy_standard_storage);
    node_type_exec(&ntype, node_shader_exec_geom);
    node_type_gpu(&ntype, gpu_shader_geom);

    nodeRegisterType(ttype, &ntype);
}