static GraphicsBuffer CreateVertexBuffer(GraphicsContext graphicsContext, GraphicsHeap graphicsHeap, GraphicsBuffer vertexStagingBuffer, float aspectRatio)
{
var vertexBuffer = graphicsHeap.CreateGraphicsBuffer(GraphicsBufferKind.Vertex, (ulong)(sizeof(TextureVertex) * 3), (ulong)sizeof(TextureVertex));
var pVertexBuffer = vertexStagingBuffer.Map <TextureVertex>();
pVertexBuffer[0] = new TextureVertex {
Position = new Vector3(0.0f, 0.25f * aspectRatio, 0.0f),
UV = new Vector2(0.5f, 1.0f),
};
pVertexBuffer[1] = new TextureVertex {
Position = new Vector3(0.25f, -0.25f * aspectRatio, 0.0f),
UV = new Vector2(1.0f, 0.0f),
};
pVertexBuffer[2] = new TextureVertex {
Position = new Vector3(-0.25f, -0.25f * aspectRatio, 0.0f),
UV = new Vector2(0.0f, 0.0f),
};
vertexStagingBuffer.Unmap(0..(sizeof(TextureVertex) * 3));
graphicsContext.Copy(vertexBuffer, vertexStagingBuffer);
return(vertexBuffer);
}
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);
}