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 GraphicsTexture CreateTexture2D(GraphicsContext graphicsContext, GraphicsHeap graphicsHeap, GraphicsBuffer textureStagingBuffer)
{
const uint TextureWidth = 256;
const uint TextureHeight = 256;
const uint TextureSize = TextureWidth * TextureHeight;
const uint CellWidth = TextureWidth / 8;
const uint CellHeight = TextureHeight / 8;
var texture2D = graphicsHeap.CreateGraphicsTexture(GraphicsTextureKind.TwoDimensional, TextureWidth, TextureHeight);
var pTextureData = textureStagingBuffer.Map <uint>();
for (uint n = 0; n < TextureSize; n++)
{
var x = n % TextureWidth;
var y = n / TextureWidth;
if ((x / CellWidth % 2) == (y / CellHeight % 2))
{
pTextureData[n] = 0xFF000000;
}
else
{
pTextureData[n] = 0xFFFFFFFF;
}
}
textureStagingBuffer.Unmap(0..(int)TextureSize);
graphicsContext.Copy(texture2D, textureStagingBuffer);
return(texture2D);
}
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 GraphicsBuffer CreateIndexBuffer(GraphicsContext graphicsContext, GraphicsBuffer indexStagingBuffer)
{
var indexBuffer = graphicsContext.Device.MemoryAllocator.CreateBuffer(GraphicsBufferKind.Index, GraphicsResourceCpuAccess.None, sizeof(ushort) * 6);
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);
}
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);
}