/*
* RB_DrawElementsInstanced
*
* Draws <numInstances> instances of elements
*/
void RB_DrawElementsInstanced( int firstVert, int numVerts, int firstElem, int numElems,
int firstShadowVert, int numShadowVerts, int firstShadowElem, int numShadowElems,
int numInstances, instancePoint_t *instances )
{
if( !numInstances ) {
return;
}
// currently not supporting dynamic instances
// they will need a separate stream so they can be used with both static and dynamic geometry
// (dynamic geometry will need changes to rbDynamicDraw_t)
assert( rb.currentVBOId > RB_VBO_NONE );
if( rb.currentVBOId <= RB_VBO_NONE ) {
return;
}
rb.drawElements.numVerts = numVerts;
rb.drawElements.numElems = numElems;
rb.drawElements.firstVert = firstVert;
rb.drawElements.firstElem = firstElem;
rb.drawElements.numInstances = 0;
rb.drawShadowElements.numVerts = numShadowVerts;
rb.drawShadowElements.numElems = numShadowElems;
rb.drawShadowElements.firstVert = firstShadowVert;
rb.drawShadowElements.firstElem = firstShadowElem;
rb.drawShadowElements.numInstances = 0;
// check for vertex-attrib-divisor style instancing
if( glConfig.ext.instanced_arrays ) {
if( rb.currentVBO->instancesOffset ) {
// static VBO's must come with their own set of instance data
rb.currentVAttribs |= VATTRIB_INSTANCES_BITS;
}
}
if( !( rb.currentVAttribs & VATTRIB_INSTANCES_BITS ) ) {
// can't use instanced arrays so we'll have to manually update
// the uniform state in between draw calls
if( rb.maxDrawInstances < numInstances ) {
if( rb.drawInstances ) {
RB_Free( rb.drawInstances );
}
rb.drawInstances = RB_Alloc( numInstances * sizeof( *rb.drawInstances ) );
rb.maxDrawInstances = numInstances;
}
memcpy( rb.drawInstances, instances, numInstances * sizeof( *instances ) );
}
rb.drawElements.numInstances = numInstances;
rb.drawShadowElements.numInstances = numInstances;
RB_DrawElements_();
}
/*
* RB_DrawElementsInstanced
*
* Draws <numInstances> instances of elements
*/
void RB_DrawElementsInstanced( int firstVert, int numVerts, int firstElem, int numElems,
int numInstances, instancePoint_t *instances )
{
if( !numInstances ) {
return;
}
// check for vertex-attrib-divisor style instancing
if( glConfig.ext.instanced_arrays ) {
// upload instances
if( rb.currentVBOId < RB_VBO_NONE ) {
rb.currentVAttribs |= VATTRIB_INSTANCES_BIT;
// FIXME: this is nasty!
while( numInstances > MAX_STREAM_VBO_INSTANCES ) {
R_UploadVBOInstancesData( rb.currentVBO, 0, MAX_STREAM_VBO_INSTANCES, instances );
rb.drawElements.numInstances = MAX_STREAM_VBO_INSTANCES;
RB_DrawElements_( firstVert, numVerts, firstElem, numElems );
instances += MAX_STREAM_VBO_INSTANCES;
numInstances -= MAX_STREAM_VBO_INSTANCES;
}
if( !numInstances ) {
return;
}
R_UploadVBOInstancesData( rb.currentVBO, 0, numInstances, instances );
} else if( rb.currentVBO->instancesOffset ) {
// static VBO's must come with their own set of instance data
rb.currentVAttribs |= VATTRIB_INSTANCES_BIT;
}
}
if( !( rb.currentVAttribs & VATTRIB_INSTANCES_BIT ) ) {
// can't use instanced arrays so we'll have to manually update
// the uniform state in between draw calls
if( rb.maxDrawInstances < numInstances ) {
if( rb.drawInstances ) {
RB_Free( rb.drawInstances );
}
rb.drawInstances = RB_Alloc( numInstances * sizeof( *rb.drawInstances ) );
rb.maxDrawInstances = numInstances;
}
memcpy( rb.drawInstances, instances, numInstances * sizeof( *instances ) );
}
rb.drawElements.numInstances = numInstances;
RB_DrawElements_( firstVert, numVerts, firstElem, numElems );
}