public Text(Device device, FontShader shader, int screenWidth, int screenHeight, Font font, Int32 maxLength, Vector4 color)
{
Font = font;
MaxLength = maxLength;
Color = color;
_shader = shader;
_screenHeight = screenHeight;
_screenWidth = screenWidth;
// The index buffer is static and do not change when the text changes
UInt32[] indices = new UInt32[maxLength * 6]; // 6 indices per character
for (UInt32 i = 0; i < maxLength; i++)
{
indices[i * 6] = i * 4;
indices[i * 6 + 1] = i * 4 + 1;
indices[i * 6 + 2] = i * 4 + 2;
indices[i * 6 + 3] = i * 4;
indices[i * 6 + 4] = i * 4 + 3;
indices[i * 6 + 5] = i * 4 + 1;
}
IndexBuffer = Buffer.Create(device, BindFlags.IndexBuffer, indices);
// The vertex buffer is initialized empty
_vertices = new FontShader.Vertex[maxLength * 4]; // 4 vertices per character
var vertexBufferDesc = new BufferDescription
{
Usage = ResourceUsage.Dynamic,
SizeInBytes = Utilities.SizeOf <FontShader.Vertex>() * maxLength * 4,
BindFlags = BindFlags.VertexBuffer,
CpuAccessFlags = CpuAccessFlags.Write,
OptionFlags = ResourceOptionFlags.None,
StructureByteStride = 0
};
// Create the vertex buffer.
VertexBuffer = Buffer.Create(device, _vertices, vertexBufferDesc);
}
public void BuildVertexArray(String text, int positionX, int positionY, ref FontShader.Vertex[] vertices, out int width, out int height)
{
width = 0;
height = Characters.First().Value.height;
for (int i = 0; i < text.Length; i++)
{
Character c = Characters[text[i]];
vertices[i * 4] = new FontShader.Vertex {
position = new Vector3(positionX, positionY, 0.0f), texture = new Vector2(c.uLeft, c.vTop)
}; //Top left
vertices[i * 4 + 1] = new FontShader.Vertex {
position = new Vector3(positionX + c.width, positionY - c.height, 0.0f), texture = new Vector2(c.uRight, c.vBottom)
}; //Right bottom
vertices[i * 4 + 2] = new FontShader.Vertex {
position = new Vector3(positionX, positionY - c.height, 0.0f), texture = new Vector2(c.uLeft, c.vBottom)
}; //Left bottom
vertices[i * 4 + 3] = new FontShader.Vertex {
position = new Vector3(positionX + c.width, positionY, 0.0f), texture = new Vector2(c.uRight, c.vTop)
}; //Top right
positionX += c.width + 1;
width += c.width + 1;
}
}
