public void Render()
{
if (this.Active)
{
Matrix4Uniform textProjection = Engine.UniformManager.GetUniform <Matrix4Uniform>("textProjection");
textProjection.Matrix = this.Camera.GetProjectionMatrix();
textProjection.Set(this.GetShader());
Vector3Uniform textColor = Engine.UniformManager.GetUniform <Vector3Uniform>("textColor");
textColor.Value = new Vector3(this.Color.R, this.Color.G, this.Color.B);
textColor.Set(this.GetShader());
GL.ActiveTexture(TextureUnit.Texture0);
this.vertexArray.Bind();
this.vertexBuffer.Bind();
GL.BufferData(BufferTarget.ArrayBuffer, sizeof(float) * 6 * 4, (IntPtr)null, BufferUsageHint.DynamicDraw);
for (int i = 0; i < this.Text.Length; i++)
{
Font.Character character = this.Font.Characters[this.Text[i]];
GL.BindTexture(TextureTarget.Texture2D, character.TextureId);
TextVertex[] subVertices = textVertices.SubArray(i * 6, 6);
this.vertexBuffer.Bind();
this.vertexBuffer.BufferSubData((IntPtr)0, TextVertex.Size * subVertices.Length, subVertices);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.DrawArrays(PrimitiveType.Triangles, 0, 6);
}
}
}
public double GetPixelWidth()
{
List <double> linesSize = new List <double>();
double currentSize = 0;
for (int i = 0; i < this.Text.Length; i++)
{
Font.Character character = this.Font.Characters[this.Text[i]];
if (this.Text[i] == '\n')
{
linesSize.Add(currentSize);
currentSize = 0;
continue;
}
currentSize += (double)(character.Advance) * this.Scale;
if (i + 1 == this.Text.Length)
{
linesSize.Add(currentSize);
}
}
linesSize.Sort((double a, double b) => {
if (a > b)
{
return(1);
}
return(-1);
});
return(linesSize.First());
}
public void UpdateVertexBuffer()
{
this.textVertices = new TextVertex[this.Text.Length * 6];
int vIndex = 0;
float x = this.Position.X;
for (int i = 0; i < this.Text.Length; i++)
{
Font.Character character = this.Font.Characters[this.Text[i]];
float xPos = x + character.Bearing.X * (float)this.Scale;
float yPos = this.Position.Y - (character.Size.Height - character.Bearing.Y) * (float)this.Scale;
float w = character.Size.Width * (float)this.Scale;
float h = character.Size.Height * (float)this.Scale;
this.textVertices[vIndex++] = new TextVertex(new Vector2(xPos, yPos + h), new Vector2(0, 0));
this.textVertices[vIndex++] = new TextVertex(new Vector2(xPos, yPos), new Vector2(0, 1));
this.textVertices[vIndex++] = new TextVertex(new Vector2(xPos + w, yPos), new Vector2(1, 1));
this.textVertices[vIndex++] = new TextVertex(new Vector2(xPos, yPos + h), new Vector2(0, 0));
this.textVertices[vIndex++] = new TextVertex(new Vector2(xPos + w, yPos), new Vector2(1, 1));
this.textVertices[vIndex++] = new TextVertex(new Vector2(xPos + w, yPos + h), new Vector2(1, 0));
x += character.Advance * (float)this.Scale;
}
}
public int GetPixelHeight()
{
Font.Character character = this.Font.Characters[this.Text[0]];
return(character.Size.Height);
}
