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CDynamicMeshBuffer::append can now handle appending meshbuffers with different vertex/index types

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Doesn't change it's own type - so can still drop data. Or overflow 16-bit buffers (which creates broken models, but no crashes).
But it no longer has a problem adding 16-bit index-buffers to a 32-bit index-buffer for example.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6494 dfc29bdd-3216-0410-991c-e03cc46cb475
This commit is contained in:
cutealien 2023-05-16 16:05:24 +00:00
parent 01588b58eb
commit 428fcca7fb
1 changed files with 24 additions and 15 deletions
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39
include/CDynamicMeshBuffer.h
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@ -109,6 +109,19 @@ namespace scene
\param indices Pointer to index array. \param indices Pointer to index array.
\param numIndices Number of indices in array. */ \param numIndices Number of indices in array. */
virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices) IRR_OVERRIDE virtual void append(const void* const vertices, u32 numVertices, const u16* const indices, u32 numIndices) IRR_OVERRIDE
{
// We simply assume it has the same vertex and index type as this object. If other types are passed this will crash
append(getVertexType(), vertices, numVertices, getIndexType(), indices, numIndices);
}
//! Append the meshbuffer to the current buffer
/** \param other Buffer to append to this one. */
virtual void append(const IMeshBuffer* const other) IRR_OVERRIDE
{
append(other->getVertexType(), other->getVertices(), other->getVertexCount(), other->getIndexType(), other->getIndices(), other->getIndexCount());
}
void append(video::E_VERTEX_TYPE vertexType, const void* const vertices, u32 numVertices, video::E_INDEX_TYPE indexType, const void* const indices, u32 numIndices)
{ {
if (vertices == getVertices() || indices == getIndices()) // can't do that because we're doing reallocations on those blocks if (vertices == getVertices() || indices == getIndices()) // can't do that because we're doing reallocations on those blocks
return; return;
@ -116,7 +129,7 @@ namespace scene
const u32 vertexCount = getVertexCount(); const u32 vertexCount = getVertexCount();
VertexBuffer->reallocate(vertexCount+numVertices); VertexBuffer->reallocate(vertexCount+numVertices);
switch ( VertexBuffer->getType() ) switch ( vertexType )
{ {
case video::EVT_STANDARD: case video::EVT_STANDARD:
for (u32 i=0; i<numVertices; ++i) for (u32 i=0; i<numVertices; ++i)
@ -142,36 +155,32 @@ namespace scene
} }
IndexBuffer->reallocate(getIndexCount()+numIndices); IndexBuffer->reallocate(getIndexCount()+numIndices);
switch ( IndexBuffer->getType() ) switch ( indexType )
{ {
case video::EIT_16BIT: case video::EIT_16BIT:
{
const irr::u16* indices16 = reinterpret_cast<const irr::u16*>(indices);
for (u32 i=0; i<numIndices; ++i) for (u32 i=0; i<numIndices; ++i)
{ {
IndexBuffer->push_back(indices[i]+vertexCount); // Note: This can overflow, not checked. Will result in broken models, but no crashes.
IndexBuffer->push_back(indices16[i]+vertexCount);
} }
break; break;
}
case video::EIT_32BIT: case video::EIT_32BIT:
{
const irr::u32* indices32 = reinterpret_cast<const irr::u32*>(indices);
for (u32 i=0; i<numIndices; ++i) for (u32 i=0; i<numIndices; ++i)
{ {
IndexBuffer->push_back(reinterpret_cast<const irr::u32*>(indices)[i]+vertexCount); IndexBuffer->push_back(indices32[i]+vertexCount);
} }
break; break;
} }
}
setDirty(); setDirty();
} }
//! Append the meshbuffer to the current buffer
/** Only works for compatible vertex and index types
\param other Buffer to append to this one. */
virtual void append(const IMeshBuffer* const other) IRR_OVERRIDE
{
if ( getVertexType() != other->getVertexType() )
return;
append(other->getVertices(), other->getVertexCount(), other->getIndices(), other->getIndexCount());
}
//! Describe what kind of primitive geometry is used by the meshbuffer //! Describe what kind of primitive geometry is used by the meshbuffer
virtual void setPrimitiveType(E_PRIMITIVE_TYPE type) IRR_OVERRIDE virtual void setPrimitiveType(E_PRIMITIVE_TYPE type) IRR_OVERRIDE