88 lines
2.0 KiB
C++
88 lines
2.0 KiB
C++
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0 */
|
|
|
|
#pragma once
|
|
|
|
/* 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/transform.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 = nullptr;
|
|
}
|
|
};
|
|
|
|
/* 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(const int num_verts, const int num_triangles);
|
|
|
|
void set_vert(Patch *patch, const int index, const float2 uv);
|
|
void add_triangle(Patch *patch, const int v0, const int v1, const int v2);
|
|
|
|
void stitch_triangles(Subpatch &sub, const int edge);
|
|
};
|
|
|
|
/* Quad EdgeDice */
|
|
|
|
class QuadDice : public EdgeDice {
|
|
public:
|
|
explicit QuadDice(const SubdParams ¶ms);
|
|
|
|
float3 eval_projected(Subpatch &sub, const float u, float v);
|
|
|
|
float2 map_uv(Subpatch &sub, const float u, float v);
|
|
void set_vert(Subpatch &sub, const int index, const float u, float v);
|
|
|
|
void add_grid(Subpatch &sub, const int Mu, const int Mv, const int offset);
|
|
|
|
void set_side(Subpatch &sub, const int edge);
|
|
|
|
float quad_area(const float3 &a, const float3 &b, const float3 &c, const float3 &d);
|
|
float scale_factor(Subpatch &sub, const int Mu, const int Mv);
|
|
|
|
void dice(Subpatch &sub);
|
|
};
|
|
|
|
CCL_NAMESPACE_END
|