void UpdateVBOs() {
PROFILE_SCOPED()
//create buffer and upload data
Graphics::VertexBufferDesc vbd;
vbd.attrib[0].semantic = Graphics::ATTRIB_POSITION;
vbd.attrib[0].format = Graphics::ATTRIB_FORMAT_FLOAT3;
vbd.attrib[1].semantic = Graphics::ATTRIB_NORMAL;
vbd.attrib[1].format = Graphics::ATTRIB_FORMAT_FLOAT3;
vbd.numVertices = ctx->NUMVERTICES();
vbd.usage = Graphics::BUFFER_USAGE_STATIC;
m_vertexBuffer.reset(Pi::renderer->CreateVertexBuffer(vbd));
GasPatchContext::VBOVertex* vtxPtr = m_vertexBuffer->Map<GasPatchContext::VBOVertex>(Graphics::BUFFER_MAP_WRITE);
assert(m_vertexBuffer->GetDesc().stride == sizeof(GasPatchContext::VBOVertex));
const Sint32 edgeLen = ctx->edgeLen;
const double frac = ctx->frac;
for (Sint32 y=0; y<edgeLen; y++) {
for (Sint32 x=0; x<edgeLen; x++) {
const vector3d p = GetSpherePoint(x*frac, y*frac);
const vector3d pSubCentroid = p - clipCentroid;
clipRadius = std::max(clipRadius, p.Length());
vtxPtr->pos = vector3f(pSubCentroid);
vtxPtr->norm = vector3f(p);
++vtxPtr; // next vertex
}
}
m_vertexBuffer->Unmap();
}
