I use DX11 + SM 4.0.
I want to render some amount of spheres (from 1 to 1000).
Each sphere has pre-computed on a CPU transform matrix: XMMATRIX xm = world*view*projection.
The problem I found is how to transfer this matrix to VS over instance buffer.
I have to split the matrix to 4 float4 values, so my layout seems like this:
{"POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0},
...
{"WORLDVIEW", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_INSTANCE_DATA, 1},
{"WORLDVIEW", 1, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_INSTANCE_DATA, 1},
{"WORLDVIEW", 2, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_INSTANCE_DATA, 1},
{"WORLDVIEW", 3, DXGI_FORMAT_R32G32B32A32_FLOAT, 1, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_INSTANCE_DATA, 1},
Vertex shader has this code:
struct VS_In
{
float3 pos: POSITION;
float4 transformMatrix0: WORLDVIEW0; //Per-instance value
float4 transformMatrix1: WORLDVIEW1; //Per-instance value
float4 transformMatrix2: WORLDVIEW2; //Per-instance value
float4 transformMatrix3: WORLDVIEW3; //Per-instance value
};
float4 VS(VS_In v) : SV_POSITION
{
float4 vp = float4(v.pos, 1.0);
float4x4 mt = float4x4(v.transformMatrix0, v.transformMatrix1, v.transformMatrix2, v.transformMatrix3);
float4 ret = mul(vp,mt);
return ret;
}
The question is: is there more elegant way of transferring float4*4 to VS over 1 value?
Thanks in advance
