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Copy pathMesh.cpp
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Copy pathMesh.cpp
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355 lines (310 loc) · 8.81 KB
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// ----------------------------------------------------------------
// From Game Programming in C++ by Sanjay Madhav
// Copyright (C) 2017 Sanjay Madhav. All rights reserved.
//
// Released under the BSD License
// See LICENSE.txt for full details.
// ----------------------------------------------------------------
#include "Mesh.h"
#include "Renderer.h"
#include "Texture.h"
#include "VertexArray.h"
#include <rapidjson/document.h>
#include <SDL/SDL_log.h>
#include "Math.h"
#include "LevelLoader.h"
#include <fstream>
namespace
{
union Vertex
{
float f;
uint8_t b[4];
};
const int BinaryVersion = 1;
struct MeshBinHeader
{
// Signature for file type
char mSignature[4] = { 'G', 'M', 'S', 'H' };
// Version
uint32_t mVersion = BinaryVersion;
// Vertex layout type
VertexArray::Layout mLayout = VertexArray::PosNormTex;
// Info about how many of each we have
uint32_t mNumTextures = 0;
uint32_t mNumVerts = 0;
uint32_t mNumIndices = 0;
// Box/radius of mesh, used for collision
AABB mBox{ Vector3::Zero, Vector3::Zero };
float mRadius = 0.0f;
};
}
Mesh::Mesh()
:mBox(Vector3::Infinity, Vector3::NegInfinity)
,mVertexArray(nullptr)
,mRadius(0.0f)
{
}
Mesh::~Mesh()
{
}
bool Mesh::Load(const std::string& fileName, Renderer* renderer)
{
mFileName = fileName;
// Try loading the binary file first
if (LoadBinary(fileName + ".bin", renderer))
{
return true;
}
rapidjson::Document doc;
if (!LevelLoader::LoadJSON(fileName, doc))
{
SDL_Log("Failed to load mesh %s", fileName.c_str());
return false;
}
int ver = doc["version"].GetInt();
// Check the version
if (ver != 1)
{
SDL_Log("Mesh %s not version 1", fileName.c_str());
return false;
}
mShaderName = doc["shader"].GetString();
// Set the vertex layout/size based on the format in the file
VertexArray::Layout layout = VertexArray::PosNormTex;
size_t vertSize = 8;
std::string vertexFormat = doc["vertexformat"].GetString();
if (vertexFormat == "PosNormSkinTex")
{
layout = VertexArray::PosNormSkinTex;
// This is the number of "Vertex" unions, which is 8 + 2 (for skinning)s
vertSize = 10;
}
// Load textures
const rapidjson::Value& textures = doc["textures"];
if (!textures.IsArray() || textures.Size() < 1)
{
SDL_Log("Mesh %s has no textures, there should be at least one", fileName.c_str());
return false;
}
std::vector<std::string> textureNames;
for (rapidjson::SizeType i = 0; i < textures.Size(); i++)
{
// Is this texture already loaded?
std::string texName = textures[i].GetString();
textureNames.emplace_back(texName);
Texture* t = renderer->GetTexture(texName);
if (t == nullptr)
{
// If it's null, use the default texture
t = renderer->GetTexture("Assets/Default.png");
}
mTextures.emplace_back(t);
}
// Load in the vertices
const rapidjson::Value& vertsJson = doc["vertices"];
if (!vertsJson.IsArray() || vertsJson.Size() < 1)
{
SDL_Log("Mesh %s has no vertices", fileName.c_str());
return false;
}
std::vector<Vertex> vertices;
vertices.reserve(vertsJson.Size() * vertSize);
mRadius = 0.0f;
for (rapidjson::SizeType i = 0; i < vertsJson.Size(); i++)
{
// For now, just assume we have 8 elements
const rapidjson::Value& vert = vertsJson[i];
if (!vert.IsArray())
{
SDL_Log("Unexpected vertex format for %s", fileName.c_str());
return false;
}
Vector3 pos(vert[0].GetDouble(), vert[1].GetDouble(), vert[2].GetDouble());
mRadius = Math::Max(mRadius, pos.LengthSq());
mBox.UpdateMinMax(pos);
if (layout == VertexArray::PosNormTex)
{
Vertex v;
// Add the floats
for (rapidjson::SizeType j = 0; j < vert.Size(); j++)
{
v.f = static_cast<float>(vert[j].GetDouble());
vertices.emplace_back(v);
}
}
else
{
Vertex v;
// Add pos/normal
for (rapidjson::SizeType j = 0; j < 6; j++)
{
v.f = static_cast<float>(vert[j].GetDouble());
vertices.emplace_back(v);
}
// Add skin information
for (rapidjson::SizeType j = 6; j < 14; j += 4)
{
v.b[0] = vert[j].GetUint();
v.b[1] = vert[j + 1].GetUint();
v.b[2] = vert[j + 2].GetUint();
v.b[3] = vert[j + 3].GetUint();
vertices.emplace_back(v);
}
// Add tex coords
for (rapidjson::SizeType j = 14; j < vert.Size(); j++)
{
v.f = vert[j].GetDouble();
vertices.emplace_back(v);
}
}
}
// We were computing length squared earlier
mRadius = Math::Sqrt(mRadius);
// Load in the indices
const rapidjson::Value& indJson = doc["indices"];
if (!indJson.IsArray() || indJson.Size() < 1)
{
SDL_Log("Mesh %s has no indices", fileName.c_str());
return false;
}
std::vector<unsigned int> indices;
indices.reserve(indJson.Size() * 3);
for (rapidjson::SizeType i = 0; i < indJson.Size(); i++)
{
const rapidjson::Value& ind = indJson[i];
if (!ind.IsArray() || ind.Size() != 3)
{
SDL_Log("Invalid indices for %s", fileName.c_str());
return false;
}
indices.emplace_back(ind[0].GetUint());
indices.emplace_back(ind[1].GetUint());
indices.emplace_back(ind[2].GetUint());
}
// Now create a vertex array
unsigned int numVerts = static_cast<unsigned>(vertices.size()) / vertSize;
mVertexArray = new VertexArray(vertices.data(), numVerts,
layout, indices.data(), static_cast<unsigned>(indices.size()));
// Save the binary mesh
SaveBinary(fileName + ".bin", vertices.data(),
numVerts, layout, indices.data(),
static_cast<unsigned>(indices.size()),
textureNames, mBox, mRadius);
return true;
}
void Mesh::Unload()
{
delete mVertexArray;
mVertexArray = nullptr;
}
Texture* Mesh::GetTexture(size_t index)
{
if (index < mTextures.size())
{
return mTextures[index];
}
else
{
return nullptr;
}
}
void Mesh::SaveBinary(const std::string& fileName, const void* verts,
uint32_t numVerts, VertexArray::Layout layout,
const uint32_t* indices, uint32_t numIndices,
const std::vector<std::string>& textureNames,
const AABB& box, float radius)
{
// Create header struct
MeshBinHeader header;
header.mLayout = layout;
header.mNumTextures =
static_cast<unsigned>(textureNames.size());
header.mNumVerts = numVerts;
header.mNumIndices = numIndices;
header.mBox = box;
header.mRadius = radius;
// Open binary file for writing
std::ofstream outFile(fileName, std::ios::out
| std::ios::binary);
if (outFile.is_open())
{
// Write the header
outFile.write(reinterpret_cast<char*>(&header), sizeof(header));
// For each texture, we need to write the size of the name
// followed by the string (null-terminated)
for (const auto& tex : textureNames)
{
// (Assume file names won't have more than 32k characters)
uint16_t nameSize = static_cast<uint16_t>(tex.length()) + 1;
outFile.write(reinterpret_cast<char*>(&nameSize), sizeof(nameSize));
outFile.write(tex.c_str(), nameSize - 1);
outFile.write("\0", 1);
}
// Figure out number of bytes for each vertex, based on layout
unsigned vertexSize = VertexArray::GetVertexSize(layout);
// Write vertices
outFile.write(reinterpret_cast<const char*>(verts),
numVerts * vertexSize);
// Write indices
outFile.write(reinterpret_cast<const char*>(indices),
numIndices * sizeof(uint32_t));
}
}
bool Mesh::LoadBinary(const std::string& fileName, Renderer* renderer)
{
std::ifstream inFile(fileName, std::ios::in |
std::ios::binary);
if (inFile.is_open())
{
// Read in header
MeshBinHeader header;
inFile.read(reinterpret_cast<char*>(&header), sizeof(header));
// Validate the header signature and version
char* sig = header.mSignature;
if (sig[0] != 'G' || sig[1] != 'M' || sig[2] != 'S' ||
sig[3] != 'H' || header.mVersion != BinaryVersion)
{
return false;
}
// Read in the texture file names
for (uint32_t i = 0; i < header.mNumTextures; i++)
{
// Get the file name size
uint16_t nameSize = 0;
inFile.read(reinterpret_cast<char*>(&nameSize), sizeof(nameSize));
// Make a buffer of this size
char* texName = new char[nameSize];
// Read in the texture name
inFile.read(texName, nameSize);
// Get this texture
Texture* t = renderer->GetTexture(texName);
if (t == nullptr)
{
// If it's null, use the default texture
t = renderer->GetTexture("Assets/Default.png");
}
mTextures.emplace_back(t);
delete[] texName;
}
// Now read in the vertices
unsigned vertexSize = VertexArray::GetVertexSize(header.mLayout);
char* verts = new char[header.mNumVerts * vertexSize];
inFile.read(verts, header.mNumVerts * vertexSize);
// Now read in the indices
uint32_t* indices = new uint32_t[header.mNumIndices];
inFile.read(reinterpret_cast<char*>(indices),
header.mNumIndices * sizeof(uint32_t));
// Now create the vertex array
mVertexArray = new VertexArray(verts, header.mNumVerts,
header.mLayout, indices, header.mNumIndices);
// Cleanup memory
delete[] verts;
delete[] indices;
// Set mBox/mRadius from header
mBox = header.mBox;
mRadius = header.mRadius;
return true;
}
return false;
}