IqmTypeMap getShader(XMLElement*elShade, ShaderPtr& sPtr, uint32_t nMat, uint32_t nLights){
// this will store all vertex attributes
IqmTypeMap ret;
// Check to see if all variables described in XML are present
string v(check("Vertex", elShade)->Attribute("src"));
string f(check("Fragment", elShade)->Attribute("src"));
ifstream vIn("../Resources/Shaders/" + v), fIn("../Resources/Shaders/" + f);
string vSrc((istreambuf_iterator<char>(vIn)), istreambuf_iterator<char>());
string fSrc((istreambuf_iterator<char>(fIn)), istreambuf_iterator<char>());
// Set the light and geom (material) count in the shaders
auto setNum = [nMat, nLights](string& shdrSrc){
auto pos = shdrSrc.find("\n");
shdrSrc.insert(pos + 1, "#define NUM_MATS " + std::to_string(nMat) + "\n");
shdrSrc.insert(pos + 1, "#define NUM_LIGHTS " + std::to_string(nLights) + "\n");
};
setNum(vSrc);
setNum(fSrc);
sPtr = Shader::FromSource(vSrc, fSrc);
auto sBind = sPtr->Bind();
// Declared vertex attributes
XMLElement * attrs = check("Attributes", elShade);
// Make sure those variables exist in the shader
for (auto el = attrs->FirstChildElement(); el; el = el->NextSiblingElement()){
string type(el->Value());
string var(el->GetText());
GLint handle = sPtr->getHandle(var); // Should I have the shader ensure it's an attribute?
// A negative handle means the query was unsuccessful
if (handle < 0){
cout << "Invalid variable queried in shader " << var << endl;
continue; //exit(6);
}
// Populate returned map
if (type.compare("Position") == 0)
ret[IqmFile::IQM_T::POSITION] = handle;
else if (type.compare("TexCoord") == 0)
ret[IqmFile::IQM_T::TEXCOORD] = handle;
else if (type.compare("Normal") == 0)
ret[IqmFile::IQM_T::NORMAL] = handle;
else if (type.compare("Tangent") == 0)
ret[IqmFile::IQM_T::TANGENT] = handle;
}
return ret;
}
void setupMiscUniforms(const ShaderPtr& sPtr){
// Uniform Handles (really shouldn't be hard coded like this)
Camera::SetProjHandle(sPtr->getHandle("PV")); // Projection Matrix
Camera::SetPosHandle(sPtr->getHandle("u_wCameraPos")); // World Space cam pos
//Camera::SetCHandle(shader["C"]); // Camera Matrix
Geometry::setMHandle(sPtr->getHandle("M")); // World transform Matrix
Geometry::setNHandle(sPtr->getHandle("N")); // Normal Matrix
Geometry::setMatIdxHandle(sPtr->getHandle("mIdx"));
// If these end up negative, so be it
Material::SetTexMapHandle(sPtr->getHandle("u_TextureMap")); // Texture Map Sampler
Material::SetNrmMapHandle(sPtr->getHandle("u_NormalMap")); // Normal Map Sample;
// This causes GL_TEXTUREi to be associated with an int
// Make a manager for this inside Textures namespace
glUniform1i(sPtr->getHandle("u_TextureMap"), COLOR_TEX_UNIT);
glUniform1i(sPtr->getHandle("u_NormalMap"), NORMAL_TEX_UNIT);
glUniform1i(sPtr->getHandle("u_EnvMap"), CUBE_TEX_UNIT);
}
Scene::Scene(string XmlSrc, ShaderPtr& sPtr, Camera& cam){
XMLDocument doc;
doc.LoadFile(XmlSrc.c_str());
// Get the root (Scene) element
XMLElement * elScene = doc.FirstChildElement("Scene");
if (!elScene){
cout << "XML Root not found. " << endl;
exit(5);
}
// Get and verify that important things are there
XMLElement * elCam = check("Camera", elScene);
XMLElement * elShade = check("Shader", elScene);
XMLElement * elGeom = check("Geom", elScene);
XMLElement * elLight = check("Light", elScene);
// First create host assets
// Init Camera
Camera::Type camType = getCamera(*elCam, cam);
if (camType == Camera::Type::NIL){
cout << "Error creating Camera" << endl;
exit(7);
}
// Init Geometry
for (XMLElement * el = elGeom->FirstChildElement(); el; el = el->NextSiblingElement())
m_vGeometry.push_back(getGeom(el));
// Set up the lights, arbitrarily assigning pre-existing geometry as its representation
for (auto el = elLight->FirstChildElement(); el; el = el->NextSiblingElement())
m_vLights.push_back(getLight(el));
// Init shader
// The material count == #geom + # of point lights
int nMaterials = m_vGeometry.size() + std::count_if(
m_vLights.begin(), m_vLights.end(), [](const Light& l){
return l.getType() == Light::Type::POINT;
});
IqmTypeMap iqmTypes = getShader(elShade, sPtr, nMaterials, m_vLights.size());
// Sort so overlapping geometry is adjacent
std::sort(m_vGeometry.begin(), m_vGeometry.end());
// Create all GPU assets, starting by binding the shader
auto sBind = sPtr->ScopeBind();
// Create Geometry
for (auto it = m_vGeometry.begin(); it != m_vGeometry.end();){
// For the first instance, create the assets
createGPUAssets(iqmTypes, *it);
// For all remaining instances, just copy VAO and nIdx
int count = std::count(m_vGeometry.begin(), m_vGeometry.end(), *it);
auto cloneIt = it;
for (int i = 1; i < count; i++){
(it + i)->setNumIndices(it->getNumIdx());
(it + i)->setVAO(it->getVAO());
}
it += count;
}
// Set up material shader access
Shader * s = sPtr.get();
auto fixMaterial = [s](Geometry& G, int i){
string m = "MatArr[i].";
m[m.length() - 3] = '0' + i;
Material M = G.getMaterial();
// Material handles aren't static
M.SetReflectHandle(s->getHandle(m + "Reflectivity"));
M.setShinyHandle(s->getHandle(m + "Shininess"));
M.setDiffHandle(s->getHandle(m + "Diffuse"));
M.setSpecHandle(s->getHandle(m + "Specular"));
createGPUAssets(M);
G.setMaterial(M);
};
// Upload all geometry materials
for (int i = 0; i < m_vGeometry.size(); i++)
fixMaterial(m_vGeometry[i], i);
// Create lights
for (int i = 0; i < m_vLights.size(); i++){
// Upload to shader (Must be accessed like "TheLights[i].Type, GL3)
string s = "LightArr[i].";
s[s.length() - 3] = '0' + i;
// Store handles per light, since they could move
m_vLights[i].SetTypeHandle(sPtr->getHandle(s + "Type"));
m_vLights[i].SetPosOrHalfHandle(sPtr->getHandle(s + "PosOrHalf"));
m_vLights[i].SetDirOrAttenHandle(sPtr->getHandle(s + "DirOrAtten"));
m_vLights[i].SetIntensityHandle(sPtr->getHandle(s + "Intensity"));
// Put light data on GPU
createGPUAssets(m_vLights[i]);
// Give point lights some geometry
if (m_vLights[i].getType() == Light::Type::POINT){
Geometry lightGeom = m_vGeometry[0];
lightGeom.identity(); // Maybe scale it somehow?
mat4 light_T = glm::translate(m_vLights[i].getPos());
lightGeom.leftMultM(light_T);
Material lightMat(10.f, 0.f, vec4(glm::linearRand(vec3(0), vec3(1)), 0.5f), vec4(1));
lightGeom.setMaterial(lightMat);
fixMaterial(lightGeom, i + m_vGeometry.size() );
m_vLights[i].SetGeometry(lightGeom);
}
//// Set up point light materials
//if (m_vLights[i].getType() == Light::Type::POINT){
// Geometry g = m_vLights[i].GetGeometry(); // I wish we didn't have to go back and forth like this
// fixMaterial(g, i + m_vGeometry.size() - 1); // but returning a reference seems like overkill
// m_vLights[i].SetGeometry(g);
//}
}
setupMiscUniforms(sPtr);
Scene::s_EnvMapHandle = sPtr->getHandle("u_EnvMap");
//// Find a better place for this, do XML
std::string cubeFaces[6] = { "posX.png", "negX.png", "posY.png", "negY.png", "posZ.png", "negZ.png" };
m_EnvMap = Textures::CubeMap(cubeFaces);
}