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Added special allocator for shadow volumes data.

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This commit is contained in:
Dario Manesku 2013-10-24 01:02:10 +01:00
parent 96743e3a5b
commit b48850a989
1 changed files with 46 additions and 18 deletions
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64
examples/14-shadowvolumes/shadowvolumes.cpp
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@ -1244,6 +1244,41 @@ struct Instance
Model* m_model;
};
struct ShadowVolumeAllocator
{
ShadowVolumeAllocator()
{
m_mem = (uint8_t*)malloc(PAGE_SIZE*2);
m_ptr = m_mem;
m_firstPage = true;
}
~ShadowVolumeAllocator()
{
free(m_mem);
}
void* alloc(uint32_t _size)
{
void* ret = (void*)m_ptr;
m_ptr += _size;
BX_CHECK(m_ptr - m_mem < (m_firstPage ? PAGE_SIZE : 2 * PAGE_SIZE), "Buffer overflow!");
return ret;
}
void swap()
{
m_ptr = m_firstPage ? m_mem + PAGE_SIZE : m_mem;
m_firstPage = !m_firstPage;
}
uint8_t* m_mem;
uint8_t* m_ptr;
bool m_firstPage;
static const uint32_t PAGE_SIZE = 1 << 28; //256 MB
};
static ShadowVolumeAllocator s_svAllocator;
struct ShadowVolumeImpl
{
enum Enum
@ -1383,10 +1418,10 @@ void shadowVolumeCreate(ShadowVolume& _shadowVolume
float m_k;
};
VertexData* verticesSide = (VertexData*) malloc (100000 * sizeof(VertexData) );
uint16_t* indicesSide = (uint16_t*) malloc (100000 * 3*sizeof(uint16_t) );
uint16_t* indicesFrontCap = (uint16_t*) malloc (100000 * 3*sizeof(uint16_t) );
uint16_t* indicesBackCap = (uint16_t*) malloc (100000 * 3*sizeof(uint16_t) );
VertexData* verticesSide = (VertexData*) s_svAllocator.alloc (100000 * sizeof(VertexData) );
uint16_t* indicesSide = (uint16_t*) s_svAllocator.alloc (100000 * 3*sizeof(uint16_t) );
uint16_t* indicesFrontCap = (uint16_t*) s_svAllocator.alloc (100000 * 3*sizeof(uint16_t) );
uint16_t* indicesBackCap = (uint16_t*) s_svAllocator.alloc (100000 * 3*sizeof(uint16_t) );
uint32_t vsideI = 0;
uint32_t sideI = 0;
@ -1587,12 +1622,10 @@ void shadowVolumeCreate(ShadowVolume& _shadowVolume
uint32_t vsize = vsideI * 5*sizeof(float);
uint32_t isize = sideI * sizeof(uint16_t);
mem = bgfx::alloc(vsize);
memcpy(mem->data, verticesSide, vsize);
mem = bgfx::makeRef(verticesSide, vsize);
_shadowVolume.m_vbSides = bgfx::createVertexBuffer(mem, decl);
mem = bgfx::alloc(isize);
memcpy(mem->data, indicesSide, isize);
mem = bgfx::makeRef(indicesSide, isize);
_shadowVolume.m_ibSides = bgfx::createIndexBuffer(mem);
// bgfx::destroy*Buffer doesn't actually destroy buffers now.
@ -1604,8 +1637,7 @@ void shadowVolumeCreate(ShadowVolume& _shadowVolume
{
//front cap
isize = frontCapI * sizeof(uint16_t);
mem = bgfx::alloc(isize);
memcpy(mem->data, indicesFrontCap, isize);
mem = bgfx::makeRef(indicesFrontCap, isize);
_shadowVolume.m_ibFrontCap = bgfx::createIndexBuffer(mem);
//gets destroyed after the end of the next frame
@ -1613,19 +1645,12 @@ void shadowVolumeCreate(ShadowVolume& _shadowVolume
//back cap
isize = backCapI * sizeof(uint16_t);
mem = bgfx::alloc(isize);
memcpy(mem->data, indicesBackCap, isize);
mem = bgfx::makeRef(indicesBackCap, isize);
_shadowVolume.m_ibBackCap = bgfx::createIndexBuffer(mem);
//gets destroyed after the end of the next frame
bgfx::destroyIndexBuffer(_shadowVolume.m_ibBackCap);
}
//release resources
free(verticesSide);
free(indicesSide);
free(indicesFrontCap);
free(indicesBackCap);
}
void createNearClipVolume(float* __restrict _outPlanes24f
@ -2725,6 +2750,9 @@ int _main_(int /*_argc*/, char** /*_argv*/)
// process submitted rendering primitives.
bgfx::frame();
// Swap memory pages.
s_svAllocator.swap();
// Reset clear values.
bgfx::setViewClearMask(UINT32_MAX
, BGFX_CLEAR_NONE