Adding bounding box computation.
Change-Id: I682609312519d9474176556ade7a208c7d0a1323
diff --git a/rsMesh.cpp b/rsMesh.cpp
index 9026578..810e4ff 100644
--- a/rsMesh.cpp
+++ b/rsMesh.cpp
@@ -224,6 +224,49 @@
return mesh;
}
+void Mesh::computeBBox() {
+ float *posPtr = NULL;
+ uint32_t vectorSize = 0;
+ uint32_t stride = 0;
+ uint32_t numVerts = 0;
+ // First we need to find the position ptr and stride
+ for (uint32_t ct=0; ct < mVertexBufferCount; ct++) {
+ const Type *bufferType = mVertexBuffers[ct]->getType();
+ const Element *bufferElem = bufferType->getElement();
+
+ for (uint32_t ct=0; ct < bufferElem->getFieldCount(); ct++) {
+ if(strcmp(bufferElem->getFieldName(ct), "position") == 0) {
+ vectorSize = bufferElem->getField(ct)->getComponent().getVectorSize();
+ stride = bufferElem->getSizeBytes() / sizeof(float);
+ uint32_t offset = bufferElem->getFieldOffsetBytes(ct);
+ posPtr = (float*)((uint8_t*)mVertexBuffers[ct]->getPtr() + offset);
+ numVerts = bufferType->getDimX();
+ break;
+ }
+ }
+ if(posPtr) {
+ break;
+ }
+ }
+
+ mBBoxMin[0] = mBBoxMin[1] = mBBoxMin[2] = 1e6;
+ mBBoxMax[0] = mBBoxMax[1] = mBBoxMax[2] = -1e6;
+ if(!posPtr) {
+ LOGE("Unable to compute bounding box");
+ mBBoxMin[0] = mBBoxMin[1] = mBBoxMin[2] = 0.0f;
+ mBBoxMax[0] = mBBoxMax[1] = mBBoxMax[2] = 0.0f;
+ return;
+ }
+
+ for(uint32_t i = 0; i < numVerts; i ++) {
+ for(uint32_t v = 0; v < vectorSize; v ++) {
+ mBBoxMin[v] = rsMin(mBBoxMin[v], posPtr[v]);
+ mBBoxMax[v] = rsMax(mBBoxMax[v], posPtr[v]);
+ }
+ posPtr += stride;
+ }
+}
+
MeshContext::MeshContext()
{