public Order addRectangle(ref int z, ref Rect rectangle, float?width)
{
Order result = new Order(-1 - rectCommands.length, z);
z++;
var cmd = new sDrawRectCommand()
{
rect = rectangle, strokeWidth = width
};
rectCommands.add(ref cmd);
return(result);
}
void layoutBuffers(Span <sDrawCall> drawCallsSpan)
{
buffersLayout.clear();
for (int i = 0; i < drawCallsSpan.Length; i++)
{
ref var dc = ref drawCallsSpan[i];
int sn = dc.order.sn;
if (sn >= 0)
{
buffersLayout.addMesh(i, drawMeshes.meshes[sn].mesh.meshInfo);
continue;
}
sn = -sn - 1;
if (dc.drawCall.mesh == eMesh.SpriteRectangle)
{
sMeshDataSize mds = new sMeshDataSize(SpriteMesh.countVertices, SpriteMesh.countTriangles);
buffersLayout.addTransparent(i, ref mds);
continue;
}
if (dc.drawCall.isText)
{
// Glyph runs can be either opaque or transparent, depending on text background
sMeshDataSize mds = drawMeshes.textCommands[sn].meshDataSize;
buffersLayout.addTransparent(i, ref mds);
continue;
}
sDrawRectCommand cmd = drawMeshes.rectCommands[sn];
sMeshDataSize size;
if (cmd.strokeWidth.HasValue)
{
size = RectangleMesh.sizeStroked;
}
else
{
size = RectangleMesh.sizeFilled;
}
buffersLayout.addOpaque(i, ref size);
}
void uploadVertices(IDeviceContext ic, Span <sDrawCall> drawCallsSpan)
{
ReadOnlySpan <int> baseVertices = buffersLayout.baseVertices;
using (var mapped = resources.getVertexBuffer().map <sVertexWithId>(ic, buffersLayout.vertexBufferSize))
{
Span <sVertexWithId> span = mapped.span;
for (int i = 0; i < drawCallsSpan.Length; i++)
{
int bv = baseVertices[i];
if (bv < 0)
{
continue; // Empty draw call, i.e. completely clipped out
}
Span <sVertexWithId> dest = span.Slice(bv);
ref var dc = ref drawCallsSpan[i];
uint id = VertexID.vertex(i);
int sn = dc.order.sn;
if (sn >= 0)
{
drawMeshes.meshes[sn].mesh.mesh.copyVertices(dest, id);
continue;
}
sn = -sn - 1;
if (dc.drawCall.mesh == eMesh.SpriteRectangle)
{
Rect rc = drawMeshes.spriteCommands[sn].rect;
SpriteMesh.writeVertices(dest, ref rc, id);
continue;
}
if (dc.drawCall.isText)
{
var text = drawMeshes.textCommands[sn];
sMeshDataSize mds;
if (text.consoleWidth.HasValue)
{
mds = text.font.renderConsole(dest, id, text.text, text.rectangle.topLeft, text.textRendering, text.consoleWidth.Value);
}
else
{
mds = text.font.renderBlock(dest, id, text.text, ref text.rectangle, text.textRendering);
}
Debug.Assert(mds.vertices <= text.meshDataSize.vertices && mds.triangles <= text.meshDataSize.triangles);
// Store the actual count of triangles written.
// uploadIndices function needs it later, to fill unused portion of the index buffer with UINT_MAX (32 bit IB) or 0xFFFF (16 bit IB) discarding the data.
// Technically that's wasted GPU bandwidth, however:
// (a) Not much of it, as normal text only contains a few of these soft hyphens and ligatures.
// (b) Saves substantial amount of resources allowing to generate the complete mesh with a single pass over the glyphs.
// With exact-sized buffers, we would have to build the complete text mesh in managed memory, then copy to GPU.
// Current implementation only buffers 1 word for left aligned blocks, or 1 line for middle or right aligned blocks, or nothing at all for single-line text. The vertices go straight to mapped GPU verftex buffer.
text.actualTriangles = mds.triangles;
drawMeshes.textCommands[sn] = text;
// dbgPrintGlyphVertices( dest );
continue;
}
sDrawRectCommand cmd = drawMeshes.rectCommands[sn];
if (cmd.strokeWidth.HasValue)
{
RectangleMesh.strokedVertices(dest, id, ref cmd.rect, cmd.strokeWidth.Value);
}
else
{
RectangleMesh.filledVertices(dest, id, ref cmd.rect);
}
}
}