public void SetText(CharacterString cs, float lineSpacing = 1.1f, int maxLineLength = int.MaxValue)
{
float[] dat = cs.GetVertexData(new Vector2i(0, 0), 0, lineSpacing, maxLineLength);
SetData(dat);
}
public static void Main(string[] args)
{
//Init the Freetype library
FreeType.Init(out FT_Library lib, out _);
//Create a new FT_Face from a .ttf font file.
FT_Face face = FT_Face.Create(lib, $@"{Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)}\Fonts\Roboto-Regular.ttf", 0);
string s = "";
//Make an array of the chars we want to use.
for (int i = 0; i < 256; i++)
{
s += (char)i;
}
//Create a new Textfont that we can use to render text with. Desired size is (auto, 48px)
TextFont tf = new TextFont_Bitmap(face, new Vector2i(0, 48), s.ToCharArray());
//Initialize Glue, Glfw, Create a window/context set it as current and load the available OpenGL functions.
Glue.Init(1280, 720, "Hello Text", out window);
//Create a new TextMesh.
TextMesh m = new TextMesh();
//Use the TextFont to create a texture atlas of the chars in the TextFont.
tex = tf.CreateTexture2D();
Shader vertShader = new Shader(Shader.ShaderStage.Vertex,
"#version 330 core",
"layout (location = 0) in vec2 vertPos;",
"layout (location = 1) in vec2 uv;",
"uniform mat4 projMatr;",
"uniform mat4 transMatr;",
"out vec2 texCoord;",
"void main()",
"{",
"gl_Position = projMatr * (vec4(vertPos,0,1.0) * transMatr);",
"texCoord = uv;",
"}");
Shader fragmentShader = new Shader(Shader.ShaderStage.Fragment,
"#version 330 core",
"in vec2 texCoord;",
"out vec4 fragColor;",
"uniform sampler2D fontBmp;",
"void main()",
"{",
"fragColor = vec4(1,1,1,texture(fontBmp,texCoord).r);",
"}");
vertShader.Compile();
fragmentShader.Compile();
ShaderProgram sp = new ShaderProgram(vertShader, fragmentShader);
sp.Link();
sp.UseProgram();
GL.glEnable(GL.GL_CULL_FACE);
GL.glEnable(GL.GL_BLEND);
GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
GL.glFrontFace(GL.GL_CW);
GL.glCullFace(GL.GL_BACK);
Glfw.SwapInterval(1);
int fontBmpLoc = sp.GetUniformLocation("fontBmp");
int projLoc = sp.GetUniformLocation("projMatr");
int transLoc = sp.GetUniformLocation("transMatr");
tex.Bind(0);
GL.glUniform1i(fontBmpLoc, 0);
Matrix4x4 ortho = Matrix4x4.CreateOrthographicProjection(0.0f, 1280f, 0.0f, 720f, -100f, 100f);
Matrix4x4 transText = Matrix4x4.CreateTranslationMatrix(new Vector3(0f, 720f, 0f));
Matrix4x4 transBitmap = Matrix4x4.CreateTranslationMatrix(new Vector3(640f, 720f, 0f));
GL.glUniformMatrix4fv(projLoc, true, ortho);
GL.glUniformMatrix4fv(transLoc, true, transText);
CharacterString cs = new CharacterString(tf, "");
Mesh quad = Mesh.CreateScreenQuad(new Vector2i(640, 720));
while (!window.ShouldClose())
{
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
GL.glUniformMatrix4fv(transLoc, true, transText);
m.Draw();
GL.glUniformMatrix4fv(transLoc, true, transBitmap);
quad.Draw();
Thread.Sleep(16);
cs.ReplaceCharacters(window.Input);
m.SetText(cs, maxLineLength: 640);
window.SwapBuffers();
Glfw.PollEvents();
}
Glue.Terminate();
}