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/*
* Copyright 2011-2013 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.
*/
#ifndef __SUBD_DICE_H__
#define __SUBD_DICE_H__
/* DX11 like EdgeDice implementation, with different tessellation factors for
* each edge for watertight tessellation, with subpatch remapping to work with
* DiagSplit. For more algorithm details, see the DiagSplit paper or the
* ARB_tessellation_shader OpenGL extension, Section 2.X.2. */
#include "util/types.h"
#include "util/vector.h"
#include "subd/subpatch.h"
CCL_NAMESPACE_BEGIN
class Camera;
class Mesh;
class Patch;
struct SubdParams {
Mesh *mesh;
bool ptex;
int test_steps;
int split_threshold;
float dicing_rate;
int max_level;
Camera *camera;
Transform objecttoworld;
SubdParams(Mesh *mesh_, bool ptex_ = false)
{
mesh = mesh_;
ptex = ptex_;
test_steps = 3;
split_threshold = 1;
dicing_rate = 1.0f;
max_level = 12;
camera = NULL;
}
};
/* EdgeDice Base */
class EdgeDice {
public:
SubdParams params;
float3 *mesh_P;
float3 *mesh_N;
size_t vert_offset;
size_t tri_offset;
explicit EdgeDice(const SubdParams ¶ms);
void reserve(int num_verts, int num_triangles);
void set_vert(Patch *patch, int index, float2 uv);
void add_triangle(Patch *patch, int v0, int v1, int v2);
void stitch_triangles(Subpatch &sub, int edge);
};
/* Quad EdgeDice */
class QuadDice : public EdgeDice {
public:
explicit QuadDice(const SubdParams ¶ms);
float3 eval_projected(Subpatch &sub, float u, float v);
float2 map_uv(Subpatch &sub, float u, float v);
void set_vert(Subpatch &sub, int index, float u, float v);
void add_grid(Subpatch &sub, int Mu, int Mv, int offset);
void set_side(Subpatch &sub, int edge);
float quad_area(const float3 &a, const float3 &b, const float3 &c, const float3 &d);
float scale_factor(Subpatch &sub, int Mu, int Mv);
void dice(Subpatch &sub);
};
CCL_NAMESPACE_END
#endif /* __SUBD_DICE_H__ */
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