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();
}
public static void Main(string[] args)
{
//Initialize the Glfw library
Glue.InitGlfw();
//Set the number of samples per pixel to 4
Glfw.WindowHint(Glfw.SAMPLES, 4);
//Create a new window
GLFW_Window window = new GLFW_Window(1280, 720, "Hello Mesh", null, null);
//Set the window as the current context
window.MakeContextCurrent();
//Load the available OpenGL functions for the window context.
Glue.InitGL(window);
//Disables resizing of the window.
window.SetAttrib(Glfw.RESIZABLE, Glfw.FALSE);
//Create a (1,1,1) cube mesh.
Mesh m = Mesh.CreateCube(new Vector3(1));
//Create a simple vertex shader
Shader vertShader = new Shader(Shader.ShaderStage.Vertex,
"#version 330 core",
"layout (location = 0) in vec3 vertPos;",
"uniform mat4 transform;",
"uniform mat4 projection;",
"",
"void main()",
"{",
"gl_Position = projection * (vec4(vertPos,1.0) * transform);",
"}");
//Then create a simple fragment shader.
Shader fragmentShader = new Shader(Shader.ShaderStage.Fragment,
"#version 330 core",
"out vec4 fragColor;",
"",
"void main()",
"{",
"fragColor = vec4(1);",
"}");
//Compile the shaders.
vertShader.Compile();
fragmentShader.Compile();
//Create a shaderprogram that uses the shaders.
ShaderProgram sp = new ShaderProgram(vertShader, fragmentShader);
//Link the program.
sp.Link();
//"Bind" the shaderprogram
sp.UseProgram();
//Get the uniform locations for the transformation and projection matricies.
int transLoc = sp.GetUniformLocation("transform");
int projLoc = sp.GetUniformLocation("projection");
//Enable face culling
GL.glEnable(GL.GL_CULL_FACE);
//Specify the winding order for the front face.
GL.glFrontFace(GL.GL_CW);
//Set the back face to be culled.
GL.glCullFace(GL.GL_BACK);
//Enable Depth test
GL.glEnable(GL.GL_DEPTH_TEST);
//Set the depth func to GL_LESS
GL.glDepthFunc(GL.GL_LESS);
//Enable V-Sync.
Glfw.SwapInterval(1);
float t = 0;
//Set the projection matrix uniform to the provided Perspective projection.
GL.glUniformMatrix4fv(projLoc, true, Matrix4x4.CreatePerspectiveProjection((float)(95d * Maths.DegreesToRadians), (float)(1280d / 720d), 0.001f, 1000f));
while (!window.ShouldClose())
{
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); //Clear the color and depth buffers.
GL.glUniformMatrix4fv(transLoc, true,
Matrix4x4.CreateScaleMatrix(new Vector3(1, 1, 1)) *
Matrix4x4.CreateRotationMatrix(
Quaternion.CreateFromAxisAngle(Vector3.Forward, (float)(Maths.WrapToRange(-180f, 180f, 360f * t) * Maths.DegreesToRadians)) //The rotation of our cube.
) *
Matrix4x4.CreateTranslationMatrix(new Vector3(0, 0, 5))
); //Set the Transform uniform matrix.
m.Draw();
Thread.Sleep(13); // ~75fps. But due to how Thread.Sleep works we will more likely see 50-60fps.
t += 0.013f;
t %= 1f;
window.SwapBuffers();
Glfw.PollEvents();
}
Glue.Terminate(); //Terminate Glue, which in turn terminates GLFW.
}
