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#include "graphics/vertex_decl.hpp"
#include "graphics/defines.hpp"
#include "base/assert.hpp"
#include "base/logging.hpp"
namespace graphics
{
VertexAttrib::VertexAttrib(ESemantic semantic,
size_t offset,
EDataType elemType,
size_t elemCount,
size_t stride)
: m_semantic(semantic),
m_offset(offset),
m_elemType(elemType),
m_elemCount(elemCount),
m_stride(stride)
{}
template <typename T>
struct FillPosition
{
static void fill(VertexAttrib const * va, PosField<T> * p, unsigned char * v, unsigned stride)
{
if (va->m_elemCount > 3)
{
p->m_w = reinterpret_cast<T*>(v + sizeof(T) * 3);
p->m_wStride = stride;
}
if (va->m_elemCount > 2)
{
p->m_z = reinterpret_cast<T*>(v + sizeof(T) * 2);
p->m_zStride = stride;
}
if (va->m_elemCount > 1)
{
p->m_y = reinterpret_cast<T*>(v + sizeof(T) * 1);
p->m_yStride = stride;
}
if (va->m_elemCount > 0)
{
p->m_x = reinterpret_cast<T*>(v);
p->m_xStride = stride;
}
}
};
template <ESemantic sem>
struct FillSemantic
{
static void fill(VertexAttrib const * va, VertexStream * vs, unsigned char * v);
};
template <>
struct FillSemantic<ESemPosition>
{
static void fill(VertexAttrib const * va, VertexStream * vs, unsigned char * v, unsigned stride)
{
switch (va->m_elemType)
{
case EFloat:
FillPosition<float>::fill(va, &vs->m_fPos, v, stride);
break;
default:
break;
}
}
};
template <>
struct FillSemantic<ESemNormal>
{
static void fill(VertexAttrib const * va, VertexStream * vs, unsigned char * v, unsigned stride)
{
switch (va->m_elemType)
{
case EFloat:
FillPosition<float>::fill(va, &vs->m_fNormal, v, stride);
break;
default:
ASSERT(false, ("Not supported"));
}
}
};
template <typename T>
struct FillTexCoord
{
static void fill(VertexAttrib const * va, TexField<T> * p, unsigned char * v, unsigned stride)
{
if (va->m_elemCount > 1)
{
p->m_v = reinterpret_cast<T*>(v + sizeof(T));
p->m_vStride = stride;
}
if (va->m_elemCount > 0)
{
p->m_u = reinterpret_cast<T*>(v);
p->m_uStride = stride;
}
}
};
template <>
struct FillSemantic<ESemTexCoord0>
{
static void fill(VertexAttrib const * va, VertexStream * vs, unsigned char * v, unsigned stride)
{
switch (va->m_elemType)
{
case EFloat:
FillTexCoord<float>::fill(va, &vs->m_fTex, v, stride);
break;
default:
ASSERT(false, ("Not supported"));
};
}
};
void VertexAttrib::initStream(VertexStream * vs, unsigned char * v, unsigned stride) const
{
switch (m_semantic)
{
case ESemPosition:
FillSemantic<ESemPosition>::fill(this, vs, v, stride);
break;
case ESemNormal:
FillSemantic<ESemNormal>::fill(this, vs, v, stride);
break;
case ESemTexCoord0:
FillSemantic<ESemTexCoord0>::fill(this, vs, v, stride);
break;
default:
LOG(LERROR, ("Unknown semantic specified"));
break;
};
}
VertexDecl::VertexDecl(VertexAttrib const * attrs, size_t cnt)
{
copy(attrs, attrs + cnt, back_inserter(m_attrs));
m_elemSize = 0;
for (unsigned i = 0; i < m_attrs.size(); ++i)
{
VertexAttrib & va = m_attrs[i];
m_elemSize += graphics::elemSize(va.m_elemType) * va.m_elemCount;
}
}
VertexAttrib const * VertexDecl::getAttr(size_t i) const
{
return &m_attrs[i];
}
size_t VertexDecl::attrCount() const
{
return m_attrs.size();
}
size_t VertexDecl::elemSize() const
{
return m_elemSize;
}
void VertexDecl::initStream(VertexStream *vs, unsigned char * v) const
{
*vs = VertexStream();
unsigned char * fieldOffs = v;
for (size_t i = 0; i < m_attrs.size(); ++i)
{
VertexAttrib const * va = &m_attrs[i];
va->initStream(vs, fieldOffs + va->m_offset, m_elemSize);
}
}
}
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