void InstancingApp::initModelCopies( int32_t sceneIndex, float* pV, int32_t* pI, NvModelGL* pMdl )
{
NvModel *pBaseMdl = pMdl->getModel();
NvModelPrimType::Enum prim;
int32_t vtxSize = pBaseMdl->getCompiledVertexSize();
int32_t vtxCount = pBaseMdl->getCompiledVertexCount();
int32_t idxCount = pBaseMdl->getCompiledIndexCount(prim);
int32_t tcOff = pBaseMdl->getCompiledTexCoordOffset();
const float* pModel = pBaseMdl->getCompiledVertices();
// write MAX_INSTANCES copies of the scene object to be instanced to
// a big vertex buffer and index buffer - this data is used in the
// shader instancing rendering path
for( int32_t i = 0; i < MAX_INSTANCES; ++i )
{
int32_t voff = vtxCount * vtxSize * i;
int32_t ioff = idxCount * i;
for( int32_t v = 0; v < vtxCount; ++v )
{
// copy original vertex
memcpy( (void*) &pV[ voff + v * vtxSize ],
(void*) &pModel[ v * vtxSize ],
vtxSize * sizeof( float) );
// patch instance id into .z component of the 3d texture coordinates
pV[ voff + v * vtxSize + tcOff + 2 ] = float( i );
}
// copy indices and modify them accordingly
for( int32_t idx = 0; idx < idxCount; ++idx )
{
pI[ioff + idx] = *(pBaseMdl->getCompiledIndices(prim) + idx);
pI[ ioff + idx ] += vtxCount * i;
}
}
}
void MultiDrawIndirect::SetupMultiDrawIndirectData( GLint PositionHandle,
GLint NormalHandle,
GLint TexcoordHandle,
GLint InstanceHandle)
{
GLuint BufferID;
NvModel* pData;
int32_t PositionSize;
int32_t NormalSize;
int32_t TexCoordSize;
pData = m_Model->getModel();
PositionSize = pData->getPositionSize();
NormalSize = pData->getNormalSize();
TexCoordSize = pData->getTexCoordSize();
SetConstants();
glBindVertexArray(m_VertexArrayObject);
glGenBuffers(1, &BufferID);
glBindBuffer(GL_ARRAY_BUFFER, BufferID);
glBufferData( GL_ARRAY_BUFFER,
m_SizeofVertexBuffer,
NULL,
GL_STATIC_DRAW);
glGenBuffers(1, &BufferID);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, BufferID);
glBufferData( GL_ELEMENT_ARRAY_BUFFER,
m_SizeofIndexBuffer,
NULL,
GL_STATIC_DRAW);
SetupMultipleModelData();
glVertexAttribPointer( PositionHandle,
PositionSize,
GL_FLOAT,
GL_FALSE,
m_VertexSize,
0);
glEnableVertexAttribArray(PositionHandle);
glVertexAttribPointer( NormalHandle,
NormalSize,
GL_FLOAT,
GL_FALSE,
m_VertexSize,
OFFSET(pData->getCompiledNormalOffset() * sizeof(float)));
glEnableVertexAttribArray(NormalHandle);
glVertexAttribPointer( TexcoordHandle,
TexCoordSize,
GL_FLOAT,
GL_FALSE,
m_VertexSize,
OFFSET(pData->getCompiledTexCoordOffset() * sizeof(float)));
glEnableVertexAttribArray(TexcoordHandle);
if (InstanceHandle >= 0) {
glVertexAttribPointer( InstanceHandle,
2,
GL_FLOAT,
GL_FALSE,
0,
OFFSET(m_OffsetofInstanceBuffer));
glEnableVertexAttribArray(InstanceHandle);
glVertexAttribDivisor(InstanceHandle,1);
}
glBindVertexArray(0);
CHECK_GL_ERROR();
}
bool InstancedTessellation::initPerModelTessellationInstancingData( NvGLModel* mdl, int32_t modelIndex )
{
NvModel* pModel = mdl->getModel();
int numFaces = pModel->getCompiledIndexCount( NvModelPrimType::TRIANGLES ) / 3;
const GLuint* pIndices = pModel->getCompiledIndices( NvModelPrimType::TRIANGLES );
const float* pVertices = pModel->getCompiledVertices();
int floatsPerV = pModel->getCompiledVertexSize();
int vtxOffset = pModel->getCompiledPositionOffset();
int normalOffset = pModel->getCompiledNormalOffset();
int textureOffset = pModel->getCompiledTexCoordOffset();
PerInstanceData* pId = new PerInstanceData[ numFaces ];
m_pTriangleData[ modelIndex ] = pId;
// build per instance/triangle data in memory
for( int i = 0; i < numFaces; ++i )
{
GLuint idx[ 3 ];
const float* pVertex[ 3 ];
nv::vec3f v[ 3 ];
nv::vec3f n[ 3 ];
nv::vec2f txt[ 3 ];
// get indices
idx[0] = pIndices[ i * 3 + 0 ];
idx[1] = pIndices[ i * 3 + 1 ];
idx[2] = pIndices[ i * 3 + 2 ];
// get vertices and normals
pVertex[0] = pVertices + floatsPerV * idx[ 0 ];
pVertex[1] = pVertices + floatsPerV * idx[ 1 ];
pVertex[2] = pVertices + floatsPerV * idx[ 2 ];
// copy vertex data
v[0] = *((nv::vec3f*)(pVertex[0]+vtxOffset));
v[1] = *((nv::vec3f*)(pVertex[1]+vtxOffset));
v[2] = *((nv::vec3f*)(pVertex[2]+vtxOffset));
n[0] = nv::normalize( *((nv::vec3f*)(pVertex[0]+normalOffset)) );
n[1] = nv::normalize( *((nv::vec3f*)(pVertex[1]+normalOffset)) );
n[2] = nv::normalize( *((nv::vec3f*)(pVertex[2]+normalOffset)) );
txt[0] = *( (nv::vec2f*) (pVertex[0]+textureOffset) );
txt[1] = *( (nv::vec2f*) (pVertex[1]+textureOffset) );
txt[2] = *( (nv::vec2f*) (pVertex[2]+textureOffset) );
// initialize interpolated vertices
pId[ i ].m_p0 = v[0];
pId[ i ].m_p1 = v[1];
pId[ i ].m_p2 = v[2];
pId[ i ].m_n0 = n[0];
pId[ i ].m_n1 = n[1];
pId[ i ].m_n2 = n[2];
//pId[ i ].m_t0t1 = nv::vec4f(txt[0].x, txt[0].y, txt[1].x, txt[1].y );
//pId[ i ].m_t2 = nv::vec2f(txt[2].x, txt[2].y );
}
glGenBuffers(1, &m_perTriangleDataVboID[modelIndex]);
glBindBuffer(GL_ARRAY_BUFFER, m_perTriangleDataVboID[modelIndex]);
glBufferData(GL_ARRAY_BUFFER, numFaces * sizeof(PerInstanceData), pId, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
return true;
}