static GraphicsBuffer CreateVertexBuffer(GraphicsContext graphicsContext, GraphicsHeap graphicsHeap, GraphicsBuffer vertexStagingBuffer, float aspectRatio)
{
var vertexBuffer = graphicsHeap.CreateGraphicsBuffer(GraphicsBufferKind.Vertex, (ulong)(sizeof(IdentityVertex) * 3), (ulong)sizeof(IdentityVertex));
var pVertexBuffer = vertexStagingBuffer.Map <IdentityVertex>();
pVertexBuffer[0] = new IdentityVertex {
Position = new Vector3(0.0f, 0.25f * aspectRatio, 0.0f),
Color = new Vector4(1.0f, 0.0f, 0.0f, 1.0f)
};
pVertexBuffer[1] = new IdentityVertex {
Position = new Vector3(0.25f, -0.25f * aspectRatio, 0.0f),
Color = new Vector4(0.0f, 1.0f, 0.0f, 1.0f)
};
pVertexBuffer[2] = new IdentityVertex {
Position = new Vector3(-0.25f, -0.25f * aspectRatio, 0.0f),
Color = new Vector4(0.0f, 0.0f, 1.0f, 1.0f)
};
vertexStagingBuffer.Unmap(0..(sizeof(IdentityVertex) * 3));
graphicsContext.Copy(vertexBuffer, vertexStagingBuffer);
return(vertexBuffer);
}
static GraphicsBuffer CreateVertexBuffer(GraphicsContext graphicsContext, GraphicsBuffer vertexStagingBuffer, float aspectRatio)
{
var vertexBuffer = graphicsContext.Device.MemoryAllocator.CreateBuffer(GraphicsBufferKind.Vertex, GraphicsResourceCpuAccess.None, (ulong)(sizeof(IdentityVertex) * 3));
var pVertexBuffer = vertexStagingBuffer.Map <IdentityVertex>();
pVertexBuffer[0] = new IdentityVertex {
Position = new Vector3(0.0f, 0.25f * aspectRatio, 0.0f),
Color = new Vector4(1.0f, 0.0f, 0.0f, 1.0f)
};
pVertexBuffer[1] = new IdentityVertex {
Position = new Vector3(0.25f, -0.25f * aspectRatio, 0.0f),
Color = new Vector4(0.0f, 1.0f, 0.0f, 1.0f)
};
pVertexBuffer[2] = new IdentityVertex {
Position = new Vector3(-0.25f, -0.25f * aspectRatio, 0.0f),
Color = new Vector4(0.0f, 0.0f, 1.0f, 1.0f)
};
vertexStagingBuffer.Unmap(0..(sizeof(IdentityVertex) * 3));
graphicsContext.Copy(vertexBuffer, vertexStagingBuffer);
return(vertexBuffer);
}
static GraphicsMemoryRegion <GraphicsResource> CreateVertexBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer vertexBuffer, GraphicsBuffer vertexStagingBuffer, float aspectRatio)
{
var vertexBufferRegion = vertexBuffer.Allocate(SizeOf <IdentityVertex>() * 4, alignment: 16);
var pVertexBuffer = vertexStagingBuffer.Map <IdentityVertex>(in vertexBufferRegion);
pVertexBuffer[0] = new IdentityVertex { //
Position = new Vector3(-0.25f, 0.25f * aspectRatio, 0.0f), // y in this setup
Color = new Vector4(1.0f, 0.0f, 0.0f, 1.0f), // ^ z the origin o
}; // | / is in the middle
// | / of the rendered scene
pVertexBuffer[1] = new IdentityVertex { // o------>x
Position = new Vector3(0.25f, 0.25f * aspectRatio, 0.0f), //
Color = new Vector4(0.0f, 1.0f, 0.0f, 1.0f), // 0 ----- 1
}; // | \ |
// | \ |
pVertexBuffer[2] = new IdentityVertex { // | \ |
Position = new Vector3(0.25f, -0.25f * aspectRatio, 0.0f), // 3-------2
Color = new Vector4(0.0f, 0.0f, 1.0f, 1.0f), //
};
pVertexBuffer[3] = new IdentityVertex {
Position = new Vector3(-0.25f, -0.25f * aspectRatio, 0.0f),
Color = new Vector4(0.0f, 1.0f, 0.0f, 1.0f),
};
vertexStagingBuffer.UnmapAndWrite(in vertexBufferRegion);
return(vertexBufferRegion);
}
static GraphicsMemoryRegion <GraphicsResource> CreateVertexBufferRegion(GraphicsContext graphicsContext, GraphicsBuffer vertexBuffer, GraphicsBuffer vertexStagingBuffer, float aspectRatio)
{
var vertexBufferRegion = vertexBuffer.Allocate(SizeOf <IdentityVertex>() * 3, alignment: 16);
var pVertexBuffer = vertexStagingBuffer.Map <IdentityVertex>(in vertexBufferRegion);
pVertexBuffer[0] = new IdentityVertex {
Position = new Vector3(0.0f, 0.25f * aspectRatio, 0.0f),
Color = new Vector4(1.0f, 0.0f, 0.0f, 1.0f)
};
pVertexBuffer[1] = new IdentityVertex {
Position = new Vector3(0.25f, -0.25f * aspectRatio, 0.0f),
Color = new Vector4(0.0f, 1.0f, 0.0f, 1.0f)
};
pVertexBuffer[2] = new IdentityVertex {
Position = new Vector3(-0.25f, -0.25f * aspectRatio, 0.0f),
Color = new Vector4(0.0f, 0.0f, 1.0f, 1.0f)
};
vertexStagingBuffer.UnmapAndWrite(in vertexBufferRegion);
return(vertexBufferRegion);
}