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 GraphicsBuffer CreateConstantBuffer(GraphicsHeap graphicsHeap)
{
var constantBuffer = graphicsHeap.CreateGraphicsBuffer(GraphicsBufferKind.Constant, 256, 64);
var pConstantBuffer = constantBuffer.Map <Matrix4x4>();
pConstantBuffer[0] = Matrix4x4.Identity;
constantBuffer.Unmap(0..sizeof(Matrix4x4));
return(constantBuffer);
}
static GraphicsBuffer CreateIndexBuffer(GraphicsContext graphicsContext, GraphicsHeap graphicsHeap, GraphicsBuffer indexStagingBuffer)
{
var indexBuffer = graphicsHeap.CreateGraphicsBuffer(GraphicsBufferKind.Index, sizeof(ushort) * 6, sizeof(ushort));
var pIndexBuffer = indexStagingBuffer.Map <ushort>();
pIndexBuffer[0] = 0;
pIndexBuffer[1] = 1;
pIndexBuffer[2] = 2;
pIndexBuffer[3] = 0;
pIndexBuffer[4] = 2;
pIndexBuffer[5] = 3;
indexStagingBuffer.Unmap(0..(sizeof(ushort) * 6));
graphicsContext.Copy(indexBuffer, indexStagingBuffer);
return(indexBuffer);
}