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#pragma once
/**
* @file primitive.h
* @brief LL GLTF Implementation
*
* $LicenseInfo:firstyear=2024&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2024, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "llvertexbuffer.h"
#include "llvolumeoctree.h"
#include "boost/json.hpp"
// LL GLTF Implementation
namespace LL
{
namespace GLTF
{
using Value = boost::json::value;
class Asset;
class Primitive
{
public:
enum class Mode : U8
{
POINTS,
LINES,
LINE_LOOP,
LINE_STRIP,
TRIANGLES,
TRIANGLE_STRIP,
TRIANGLE_FAN
};
~Primitive();
// CPU copy of mesh data
std::vector<LLVector2> mTexCoords0;
std::vector<LLVector2> mTexCoords1;
std::vector<LLVector4a> mNormals;
std::vector<LLVector4a> mTangents;
std::vector<LLVector4a> mPositions;
std::vector<U64> mJoints;
std::vector<LLVector4a> mWeights;
std::vector<LLColor4U> mColors;
std::vector<U32> mIndexArray;
// raycast acceleration structure
LLPointer<LLVolumeOctree> mOctree;
std::vector<LLVolumeTriangle> mOctreeTriangles;
S32 mMaterial = -1;
Mode mMode = Mode::TRIANGLES; // default to triangles
LLRender::eGeomModes mGLMode = LLRender::TRIANGLES; // for use with LLRender
S32 mIndices = -1;
// shader variant according to LLGLSLShader::GLTFVariant flags
U8 mShaderVariant = 0;
// vertex attribute mask
U32 mAttributeMask = 0;
// backpointer to vertex buffer (owned by Asset)
LLPointer<LLVertexBuffer> mVertexBuffer;
U32 mVertexOffset = 0;
U32 mIndexOffset = 0;
U32 getVertexCount() const { return (U32) mPositions.size(); }
U32 getIndexCount() const { return (U32) mIndexArray.size(); }
std::unordered_map<std::string, S32> mAttributes;
// create octree based on vertex buffer
// must be called before buffer is unmapped and after buffer is populated with good data
void createOctree();
//get the LLVolumeTriangle that intersects with the given line segment at the point
//closest to start. Moves end to the point of intersection. Returns nullptr if no intersection.
//Line segment must be in the same coordinate frame as this Primitive
const LLVolumeTriangle* lineSegmentIntersect(const LLVector4a& start, const LLVector4a& end,
LLVector4a* intersection = NULL, // return the intersection point
LLVector2* tex_coord = NULL, // return the texture coordinates of the intersection point
LLVector4a* normal = NULL, // return the surface normal at the intersection point
LLVector4a* tangent = NULL // return the surface tangent at the intersection point
);
void serialize(boost::json::object& obj) const;
const Primitive& operator=(const Value& src);
bool prep(Asset& asset);
// upload geometry to given vertex buffer
// asserts that buffer is bound
// asserts that buffer is valid for this primitive
void upload(LLVertexBuffer* buffer);
};
}
}
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