public void DrawQuad(Texture2D texture,
VertexPosition2TextureColor bl,
VertexPosition2TextureColor br,
VertexPosition2TextureColor tr,
VertexPosition2TextureColor tl)
{
if (!_active)
{
throw new InvalidOperationException("Begin() must be called before SpriteBatch may be used for drawing.");
}
if (texture == null)
{
throw new ArgumentNullException(nameof(texture));
}
FlushIfNeeded(texture);
_count++;
EnsureBufferLargeEnough();
int vertexOffset = (_count - 1) * 4;
int indexOffset = (_count - 1) * 6;
_vertexData[vertexOffset + 0] = bl;
_vertexData[vertexOffset + 1] = br;
_vertexData[vertexOffset + 2] = tr;
_vertexData[vertexOffset + 3] = tl;
_indexData[indexOffset + 0] = (ushort)(vertexOffset + 0);
_indexData[indexOffset + 1] = (ushort)(vertexOffset + 1);
_indexData[indexOffset + 2] = (ushort)(vertexOffset + 2);
_indexData[indexOffset + 3] = (ushort)(vertexOffset + 0);
_indexData[indexOffset + 4] = (ushort)(vertexOffset + 2);
_indexData[indexOffset + 5] = (ushort)(vertexOffset + 3);
}
private unsafe void EnsureBufferLargeEnough()
{
if (_count * 4 > _vertexBufferSize)
{
//_log.Debug("SpriteBatch capacity increased from " + _vertexBufferSize + " to " + (int)(_vertexBufferSize * 1.5f));
_vertexBufferSize = (int)(_vertexBufferSize * 1.5f); // To increase capacity
_indexBufferSize = (int)(_vertexBufferSize * 1.5f); // To have 2:3 ratio from vertex to index
if (_vertexBufferSize > MAX_BATCH_SIZE * 4)
{
_vertexBufferSize = MAX_BATCH_SIZE * 4;
}
if (_indexBufferSize > MAX_BATCH_SIZE * 6)
{
_indexBufferSize = MAX_BATCH_SIZE * 6;
}
// Increase capacity of _vertexData
var tempVertexData = new VertexPosition2TextureColor[_vertexData.Length];
fixed(void *vertexSourcePtr = &_vertexData[0])
fixed(void *vertexDestPtr = &tempVertexData[0])
{
System.Buffer.MemoryCopy(vertexSourcePtr,
vertexDestPtr,
tempVertexData.Length * sizeof(VertexPosition2TextureColor),
_vertexData.Length * sizeof(VertexPosition2TextureColor));
}
// Increase vertexData capacity
_vertexData = new VertexPosition2TextureColor[_vertexBufferSize];
fixed(void *vertexSourcePtr = &tempVertexData[0])
fixed(void *vertexDestPtr = &_vertexData[0])
{
// Store vertex data from temp array back into _vertexData
System.Buffer.MemoryCopy(vertexSourcePtr,
vertexDestPtr,
tempVertexData.Length * sizeof(VertexPosition2TextureColor),
tempVertexData.Length * sizeof(VertexPosition2TextureColor));
}
// Increase capacity of _indexData
var tempIndexData = new ushort[_indexData.Length];
fixed(void *indexSourcePtr = &_indexData[0])
fixed(void *indexDestPtr = &tempIndexData[0])
{
// Store vertex data in temp array
System.Buffer.MemoryCopy(indexSourcePtr,
indexDestPtr,
_indexData.Length * sizeof(ushort),
_indexData.Length * sizeof(ushort));
}
// Increase indexData capacity
_indexData = new ushort[_indexBufferSize];
fixed(void *indexSourcePtr = &tempIndexData[0])
fixed(void *indexDestPtr = &_indexData[0])
{
// Store vertex data from temp array back into _vertexData
System.Buffer.MemoryCopy(indexSourcePtr,
indexDestPtr,
tempIndexData.Length * sizeof(ushort),
tempIndexData.Length * sizeof(ushort));
}
CreateVertexBuffer();
CreateIndexBuffer();
}
}
