I've got this constant buffer.
// Buffer Definitions:
//
// cbuffer cMultiFrame
// {
//
// row_major float4x4 WorldMatrix; // Offset: 0 Size: 64 [unused]
// bool Lamp; // Offset: 64 Size: 4 [unused]
// float SampleWeights[7]; // Offset: 80 Size: 100
// float2 SampleOffsets[7]; // Offset: 192 Size: 104
//
// }
//
As you can see, while real sizeof(cMultiFrame) in Visual Studio = 160, when i call Draw function, it say me a warning:
Quote:
D3D10: WARNING: ID3D10Device::Draw: The size of the Constant Buffer at slot 0 of the Pixel Shader unit is too small (160 bytes provided, 304 bytes, at least, expected).
At first i can't understand why 7 floats = 100 bytes while it should be only 28!
All this due to packing rules and floating problems.
The way is to use packoffset to force packing rules, i tried in this way following the documentation
At first i increased SAMPLE_COUNT to 8 to have float * 8 = 2 float4 and 8 * float2 = 4 float4.
And wrote this code.
cbuffer cMultiFrame
{
row_major float4x4 WorldMatrix : packoffset(c0);
float SampleWeights[SAMPLE_COUNT] : packoffset(c4);
float2 SampleOffsets[SAMPLE_COUNT] : packoffset(c6);
bool Lamp : packoffset(c10.x);
};
But it say me i'm overriding other values.
Can you suggest me right way to organize this constant buffer?
