static GraphicsMemoryRegion <GraphicsResource> CreateVertexBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer vertexBuffer, GraphicsBuffer vertexStagingBuffer, float aspectRatio)
{
var vertexBufferRegion = vertexBuffer.Allocate(SizeOf <Texture3DVertex>() * 4, alignment: 16);
var pVertexBuffer = vertexStagingBuffer.Map <Texture3DVertex>(in vertexBufferRegion);
pVertexBuffer[0] = new Texture3DVertex { //
Position = new Vector3(-0.5f, 0.5f, 0.0f), // y in this setup
UVW = new Vector3(0, 1, 0.5f), // ^ z the origin o
}; // | / is in the middle
// | / of the rendered scene
pVertexBuffer[1] = new Texture3DVertex { // o------>x
Position = new Vector3(0.5f, 0.5f, 0.0f), //
UVW = new Vector3(1, 1, 0.5f), // 0 ----- 1
}; // | \ |
// | \ |
pVertexBuffer[2] = new Texture3DVertex { // | \ |
Position = new Vector3(0.5f, -0.5f, 0.0f), // 3-------2
UVW = new Vector3(1, 0, 0.5f), //
};
pVertexBuffer[3] = new Texture3DVertex {
Position = new Vector3(-0.5f, -0.5f, 0.0f),
UVW = new Vector3(0, 0, 0.5f),
};
vertexStagingBuffer.UnmapAndWrite(in vertexBufferRegion);
return(vertexBufferRegion);
}
static GraphicsMemoryRegion <GraphicsResource> CreateVertexBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer vertexBuffer, GraphicsBuffer vertexStagingBuffer, List <Vector3> vertices, List <Vector3> normals)
{
var vertexBufferRegion = vertexBuffer.Allocate(SizeOf <PosNormTex3DVertex>() * (uint)vertices.Count, alignment: 16);
var pVertexBuffer = vertexStagingBuffer.Map <PosNormTex3DVertex>(in vertexBufferRegion);
// assumes the vertices are in a box from (-1,-1,-1) to (1,1,1)
var offset3D = new Vector3(1, 1, 1); // to move lower left corner to (0,0,0)
var scale3D = new Vector3(0.5f, 0.5f, 0.5f); // to scale to side length 1
for (var i = 0; i < vertices.Count; i++)
{
var xyz = vertices[i]; // position
var normal = normals[i]; // normal
var uvw = (xyz + offset3D) * scale3D; // texture coordinate
pVertexBuffer[i] = new PosNormTex3DVertex {
Position = xyz,
Normal = normal,
UVW = uvw
};
}
vertexStagingBuffer.UnmapAndWrite(in vertexBufferRegion);
return(vertexBufferRegion);
}
static GraphicsMemoryRegion <GraphicsResource> CreateConstantBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer constantBuffer)
{
var constantBufferRegion = constantBuffer.Allocate(SizeOf <Matrix4x4>(), alignment: 256);
var pConstantBuffer = constantBuffer.Map <Matrix4x4>(in constantBufferRegion);
pConstantBuffer[0] = Matrix4x4.Identity;
constantBuffer.UnmapAndWrite(in constantBufferRegion);
return(constantBufferRegion);
}
static GraphicsMemoryRegion <GraphicsResource> CreateIndexBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer indexBuffer, GraphicsBuffer indexStagingBuffer, List <uint> indices)
{
var indexBufferRegion = indexBuffer.Allocate(SizeOf <uint>() * (uint)indices.Count, alignment: 4);
var pIndexBuffer = indexStagingBuffer.Map <uint>(in indexBufferRegion);
for (var i = 0; i < indices.Count; i++)
{
pIndexBuffer[i] = indices[i];
}
indexStagingBuffer.UnmapAndWrite(in indexBufferRegion);
return(indexBufferRegion);
}
static GraphicsMemoryRegion <GraphicsResource> CreateIndexBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer indexBuffer, GraphicsBuffer indexStagingBuffer)
{
var indexBufferRegion = indexBuffer.Allocate(SizeOf <ushort>() * 6, alignment: 2);
var pIndexBuffer = indexStagingBuffer.Map <ushort>(in indexBufferRegion);
// clockwise when looking at the triangle from the outside
pIndexBuffer[0] = 0;
pIndexBuffer[1] = 1;
pIndexBuffer[2] = 2;
pIndexBuffer[3] = 0;
pIndexBuffer[4] = 2;
pIndexBuffer[5] = 3;
indexStagingBuffer.UnmapAndWrite(in indexBufferRegion);
return(indexBufferRegion);
}
static GraphicsMemoryRegion <GraphicsResource> CreateVertexBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer vertexBuffer, GraphicsBuffer vertexStagingBuffer, float aspectRatio)
{
var vertexBufferRegion = vertexBuffer.Allocate(SizeOf <TextureVertex>() * 3, alignment: 16);
var pVertexBuffer = vertexStagingBuffer.Map <TextureVertex>(in vertexBufferRegion);
pVertexBuffer[0] = new TextureVertex {
Position = new Vector3(0.0f, 0.25f * aspectRatio, 0.0f),
UV = new Vector2(1.0f, 0.0f)
};
pVertexBuffer[1] = new TextureVertex {
Position = new Vector3(0.25f, -0.25f * aspectRatio, 0.0f),
UV = new Vector2(0.0f, 1.0f)
};
pVertexBuffer[2] = new TextureVertex {
Position = new Vector3(-0.25f, -0.25f * aspectRatio, 0.0f),
UV = new Vector2(0.0f, 0.0f)
};
vertexStagingBuffer.UnmapAndWrite(in vertexBufferRegion);
return(vertexBufferRegion);
}
