protected void OnLoad(object sender, EventArgs e)
{
spriteBatch = new SpriteBatch();
texture = new Texture(new Bitmap(@"Content/test.png"));
sprite = new Sprite(texture);
arial = new BitmapFont("Content/arial_test");
text = new Text(arial, "The quick brown fox \njumps over the lazy dog.", new Vector2(0, 256), Color.Black);
fpsFont = new BitmapFont(@"Content/fps_font");
fpsCounter = new ClockDisplay(Game.Clock, fpsFont, Vector2.Zero, Color.Black); // White is also default
camera = Camera.CreateOrthographic(Game.ClientSize.Width, Game.ClientSize.Height, -1, 1);
}
/// <summary>
/// Draw all batched sprites.
/// </summary>
/// <param name="camera">Optional camera.</param>
public void Draw(OrthographicCamera camera = null)
{
GL.Disable(EnableCap.DepthTest);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
DrawSprites(camera);
GL.Disable(EnableCap.Blend);
GL.Enable(EnableCap.DepthTest);
}
private void DrawSprites(OrthographicCamera camera = null)
{
Matrix4 MVP, lastMVP = Matrix4.Identity;
camera = camera ?? DefaultCamera;
Vector4 lastTint = Vector4.One;
int lastTexID = -1;
spriteShader.Use();
GL.BindVertexArray(0);
GL.ActiveTexture(TextureUnit.Texture0);
spriteShader.SetUniform("tint", lastTint);
foreach (var spr in spritesToDraw)
{
GL.BindVertexArray(spr.VAO);
MVP = spr.Transform.Matrix * camera.ViewMatrix * camera.ProjectionMatrix;
if (MVP != lastMVP)
{
lastMVP = MVP;
spriteShader.SetUniform("MVP", lastMVP);
}
if (spr.Tint != lastTint)
{
lastTint = spr.Tint;
spriteShader.SetUniform("tint", lastTint);
}
if (spr.Texture.TexID != lastTexID)
{
lastTexID = spr.Texture.TexID;
GL.BindTexture(TextureTarget.Texture2D, lastTexID);
GL.TexParameterI(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, new int[] { (int)TextureMinFilter.Linear });
}
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
}
GL.BindVertexArray(0);
spritesToDraw.Clear();
}
private static void Default_Camera_Resize_Hook(object sender, EventArgs e)
{
DefaultCamera = Camera.CreateOrthographicTopLeftOrigin(Game.ClientSize.Width, Game.ClientSize.Height, -1, 1);
}
