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/*
* Copyright 2011, Blender Foundation.
*
* 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.
*/
#include "device.h"
#include "mesh.h"
#include "scene.h"
#include "shader.h"
#include "util_foreach.h"
#include "util_progress.h"
CCL_NAMESPACE_BEGIN
bool MeshManager::displace(Device *device, Scene *scene, Mesh *mesh, Progress& progress)
{
/* verify if we have a displacement shader */
bool has_displacement = false;
if(mesh->displacement_method != Mesh::DISPLACE_BUMP) {
foreach(uint sindex, mesh->used_shaders)
if(scene->shaders[sindex]->has_displacement)
has_displacement = true;
}
if(!has_displacement)
return false;
/* setup input for device task */
vector<bool> done(mesh->verts.size(), false);
device_vector<uint4> d_input;
uint4 *d_input_data = d_input.resize(mesh->verts.size());
size_t d_input_offset = 0;
for(size_t i = 0; i < mesh->triangles.size(); i++) {
Mesh::Triangle t = mesh->triangles[i];
Shader *shader = scene->shaders[mesh->shader[i]];
if(!shader->has_displacement)
continue;
for(int j = 0; j < 3; j++) {
if(done[t.v[j]])
continue;
done[t.v[j]] = true;
/* set up object, primitive and barycentric coordinates */
/* when used, non-instanced convention: object = -object-1; */
int object = ~0; /* todo */
int prim = mesh->tri_offset + i;
float u, v;
if(j == 0) {
u = 1.0f;
v = 0.0f;
}
else if(j == 1) {
u = 0.0f;
v = 1.0f;
}
else {
u = 0.0f;
v = 0.0f;
}
/* back */
uint4 in = make_uint4(object, prim, __float_as_int(u), __float_as_int(v));
d_input_data[d_input_offset++] = in;
}
}
if(d_input_offset == 0)
return false;
/* run device task */
device_vector<float3> d_offset;
d_offset.resize(d_input.size());
device->mem_alloc(d_input, MEM_READ_ONLY);
device->mem_copy_to(d_input);
device->mem_alloc(d_offset, MEM_WRITE_ONLY);
DeviceTask task(DeviceTask::DISPLACE);
task.displace_input = d_input.device_pointer;
task.displace_offset = d_offset.device_pointer;
task.displace_x = 0;
task.displace_w = d_input.size();
device->task_add(task);
device->task_wait();
device->mem_copy_from(d_offset, 0, sizeof(float3)*d_offset.size());
device->mem_free(d_input);
device->mem_free(d_offset);
if(progress.get_cancel())
return false;
/* read result */
done.clear();
done.resize(mesh->verts.size(), false);
int k = 0;
float3 *offset = (float3*)d_offset.data_pointer;
for(size_t i = 0; i < mesh->triangles.size(); i++) {
Mesh::Triangle t = mesh->triangles[i];
Shader *shader = scene->shaders[mesh->shader[i]];
if(!shader->has_displacement)
continue;
for(int j = 0; j < 3; j++) {
if(!done[t.v[j]]) {
done[t.v[j]] = true;
mesh->verts[t.v[j]] += offset[k++];
}
}
}
/* for displacement method both, we only need to recompute the face
* normals, as bump mapping in the shader will already alter the
* vertex normal, so we start from the non-displaced vertex normals
* to avoid applying the perturbation twice. */
mesh->attributes.remove(Attribute::STD_FACE_NORMAL);
mesh->add_face_normals();
if(mesh->displacement_method == Mesh::DISPLACE_TRUE) {
mesh->attributes.remove(Attribute::STD_VERTEX_NORMAL);
mesh->add_vertex_normals();
}
return true;
}
CCL_NAMESPACE_END
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