private void PopulateMesh(
LocalRectTransform rectTransform,
float4x4 localToWorld,
TextRenderer textRenderer,
float4 color,
TextData textData,
DynamicBuffer <Vertex> vertices,
DynamicBuffer <VertexIndex> triangles,
DynamicBuffer <TextLine> lines)
{
var verticalAlignment = (_VerticalAlignmentOptions)textRenderer.Alignment;
var horizontalAlignment = (_HorizontalAlignmentOptions)textRenderer.Alignment;
var font = FontAssetFromEntity[textRenderer.Font];
var glyphData = FontGlyphFromEntity[textRenderer.Font];
float2 canvasScale = textRenderer.Size / font.PointSize * 0.1f;
float stylePadding = 1.25f + (textRenderer.Bold ? font.BoldStyle / 4.0f : font.NormalStyle / 4.0f);
float styleSpaceMultiplier = 1.0f + (textRenderer.Bold ? font.BoldSpace * 0.01f : font.NormalSpace * 0.01f);
TextUtility.CalculateLines(rectTransform, canvasScale, styleSpaceMultiplier, glyphData, textData, lines);
float textBlockHeight = lines.Length * font.LineHeight * canvasScale.y;
float2 alignedStartPosition = TextUtility.GetAlignedStartPosition(rectTransform, textRenderer, font, textBlockHeight, canvasScale);
float2 currentCharacter = alignedStartPosition;
int lineIdx = 0;
for (int i = 0; i < textData.Value.LengthInBytes; i++)
{
if (lineIdx < lines.Length && i == lines[lineIdx].CharacterOffset)
{
currentCharacter = new float2(
TextUtility.GetAlignedLinePosition(rectTransform, lines[lineIdx].LineWidth, horizontalAlignment),
alignedStartPosition.y - font.LineHeight * canvasScale.y * lineIdx);
lineIdx++;
}
var character = textData.Value.GetChar(i);
if (TextUtility.GetGlyph(character, glyphData, out FontGlyph ch))
{
int startVertexIndex = i * 4;
int startTriangleIndex = i * 6;
float2 uv2 = new float2(ch.Scale, ch.Scale) * math.select(canvasScale, -canvasScale, textRenderer.Bold);
float3 min = new float3(currentCharacter, 0) +
new float3(ch.Metrics.horizontalBearingX - stylePadding, ch.Metrics.horizontalBearingY - ch.Metrics.height - stylePadding, 0) *
new float3(canvasScale, 1f);
float3 max = min +
new float3(ch.Metrics.width + stylePadding * 2.0f, ch.Metrics.height + stylePadding * 2.0f, 0) *
new float3(canvasScale, 1f);
var v0 = math.mul(localToWorld, float4x4.Translate(min)).Position();
var v1 = math.mul(localToWorld, float4x4.Translate(new float3(max.x, min.y, min.z))).Position();
var v2 = math.mul(localToWorld, float4x4.Translate(max)).Position();
var v3 = math.mul(localToWorld, float4x4.Translate(new float3(min.x, max.y, min.z))).Position();
var normal = math.mul(
new float4x4(localToWorld.Rotation(), new float3()),
float4x4.Translate(new float3(0, 0, -1))).c3;
float4 uv = new float4(
ch.Rect.x - stylePadding, ch.Rect.y - stylePadding,
ch.Rect.x + ch.Rect.width + stylePadding,
ch.Rect.y + ch.Rect.height + stylePadding) /
new float4(font.AtlasSize, font.AtlasSize);
triangles[startTriangleIndex] = startVertexIndex + 2;
triangles[startTriangleIndex + 1] = startVertexIndex + 1;
triangles[startTriangleIndex + 2] = startVertexIndex;
triangles[startTriangleIndex + 3] = startVertexIndex + 3;
triangles[startTriangleIndex + 4] = startVertexIndex + 2;
triangles[startTriangleIndex + 5] = startVertexIndex;
vertices[startVertexIndex] = new Vertex()
{
Position = v0,
Normal = (half4)normal,
TexCoord0 = (half2)uv.xy,
TexCoord1 = (half2)uv2,
Color = (half4)color
};
vertices[startVertexIndex + 1] = new Vertex()
{
Position = v1,
Normal = (half4)normal,
TexCoord0 = (half2)uv.zy,
TexCoord1 = (half2)uv2,
Color = (half4)color
};
vertices[startVertexIndex + 2] = new Vertex()
{
Position = v2,
Normal = (half4)normal,
TexCoord0 = (half2)uv.zw,
TexCoord1 = (half2)uv2,
Color = (half4)color
};
vertices[startVertexIndex + 3] = new Vertex()
{
Position = v3,
Normal = (half4)normal,
TexCoord0 = (half2)uv.xw,
TexCoord1 = (half2)uv2,
Color = (half4)color
};
currentCharacter +=
new float2(ch.Metrics.horizontalAdvance * styleSpaceMultiplier, 0.0f) * canvasScale;
}
}
}
