protected override void OnLoad(EventArgs e)
{
// Initialize GL State
GPUCapabilities.Initialize();
GL.ClearColor(0.25f, 0.25f, 0.25f, 1.0f);
// Set up PackageManager
PackageManager.BasePath = "../../Assets/";
// Initialize camera. Rest is in OnResize()
orthoCamera = new Camera(this);
orthoCamera.SetAsCurrent();
// Load shaders
ShaderManager.LoadCollection("Shaders/collection.xml");
// Initialize batch and atlas manager
spriteBatch = new SpriteBatch();
sam = new SpriteAtlasManager();
// Temporary example until editor gets sprite support
// Uncomment to regenerate sprite file
//GenerateSpriteFile();
// Get the sprite atlas
spaceShips = sam.Get("Sprites/SpaceShips.spr", true);
// Get sprite by ID (slow operation, cache result on load)
spaceShip = spaceShips["PlayerBlue1"];
}
// This is a temporary solution until editor has support for sprite editing.
private void GenerateSpriteFile()
{
// Calculate sprite UV coordinates in the atlas
float left = 211f;
float top = 941f;
float right = 211f + 99f;
float bottom = 941f + 75f;
left /= 1024f;
top /= 1024f;
right /= 1024f;
bottom /= 1024f;
// All sprites are children of the atlas they belong to
spaceShips = new SpriteAtlas()
{
Sprites = new List<Sprite>()
{
new Sprite() {
Name = "PlayerBlue1", // Sprite ID in this atlas
Vertices = new Vector3[] { // A sprite can have more vertices,
new Vector3(-0.5f, -0.5f, 0), // useful for fill-rate optimization.
new Vector3(0.5f, -0.5f, 0), // vertex position count and uv count
new Vector3(-0.5f, 0.5f, 0), // must be equal. 4 vert -> 4 uv
new Vector3(0.5f, 0.5f, 0),
},
TextureCoordinates = new Vector2[] {
new Vector2(left, bottom),
new Vector2(right, bottom),
new Vector2(left, top),
new Vector2(right, top),
},
Indices = new uint[] {
0,1,2,2,1,3
},
Size = new Vector2(99f, 75f)
}
},
// A texture path that will get loaded automatically when the atlas gets loaded
TextureName = "Textures/spaceships.tex",
// Our texels does not have premultiplied alpha
PremultipliedAlpha = false,
};
// Insert in temporary location and save to filesystem
sam.Insert("tmp", spaceShips);
sam.Save("tmp", PackageManager.BasePath + "Sprites/SpaceShips.spr");
sam.Remove("tmp");
}
public void BeginBatch(SpriteAtlas atlas)
{
current = atlas;
if (vao == 0)
{
program = ShaderManager.Get("sprite.shader");
vao = GL.GenVertexArray();
GL.GenBuffers(2, vbo);
GL.BindVertexArray(vao);
GL.BindBuffer(BufferTarget.ArrayBuffer, vbo[0]);
int vertex = program.GetAttribLocation("vertex");
int uv = program.GetAttribLocation("uv");
int position = program.GetAttribLocation("position");
int size = program.GetAttribLocation("size");
int rotation = program.GetAttribLocation("rotation");
int color = program.GetAttribLocation("color");
int stride = BlittableValueType.StrideOf(new SpriteRenderData());
int offset = 0;
GL.EnableVertexAttribArray(vertex);
GL.VertexAttribPointer(vertex, 3, VertexAttribPointerType.Float, false, stride, offset);
offset += Vector3.SizeInBytes;
if(uv != -1)
{
GL.EnableVertexAttribArray(uv);
GL.VertexAttribPointer(uv, 2, VertexAttribPointerType.Float, false, stride, offset);
}
offset += Vector2.SizeInBytes;
if(position != -1)
{
GL.EnableVertexAttribArray(position);
GL.VertexAttribPointer(position, 3, VertexAttribPointerType.Float, false, stride, offset);
}
offset += Vector3.SizeInBytes;
if(size != -1)
{
GL.EnableVertexAttribArray(size);
GL.VertexAttribPointer(size, 2, VertexAttribPointerType.Float, false, stride, offset);
}
offset += Vector2.SizeInBytes;
if(rotation != -1)
{
GL.EnableVertexAttribArray(rotation);
GL.VertexAttribPointer(rotation, 1, VertexAttribPointerType.Float, false, stride, offset);
}
offset += sizeof(float);
if (color != -1)
{
GL.EnableVertexAttribArray(color);
GL.VertexAttribPointer(color, 4, VertexAttribPointerType.Float, false, stride, offset);
}
offset += Vector4.SizeInBytes;
GL.BindBuffer(BufferTarget.ElementArrayBuffer, vbo[1]);
GL.BindVertexArray(0);
}
}
// This is a temporary solution until editor has support for sprite editing.
private void GenerateSpriteFile()
{
// One texel unit
float unit = 1f / 1024f;
// Texture coordinates on the atlas
float punkLeft = 0;
float punkTop = 0;
float punkRight = 128 * unit;
float punkBottom = 128 * unit;
float punkLeft2 = punkRight;
float punkRight2 = punkRight + 128 * unit;
var vertices = new Vector3[] { // A sprite can have more vertices,
new Vector3(-0.5f, -0.5f, 0), // useful for fill-rate optimization.
new Vector3(0.5f, -0.5f, 0), // vertex position count and uv count
new Vector3(-0.5f, 0.5f, 0), // must be equal. 4 vert -> 4 uv
new Vector3(0.5f, 0.5f, 0),
};
// All sprites are children of the atlas they belong to
spriteAtlas = new SpriteAtlas()
{
Sprites = new List<Sprite>()
{
new Sprite() {
Name = "PunkBird.0", // Sprite ID in this atlas
Vertices = vertices,
TextureCoordinates = new Vector2[] {
new Vector2(punkLeft, punkTop),
new Vector2(punkRight, punkTop),
new Vector2(punkLeft, punkBottom),
new Vector2(punkRight, punkBottom),
},
Indices = new uint[] {
0,1,2,2,1,3
},
Size = new Vector2(99f, 75f)
},
new Sprite() {
Name = "PunkBird.1", // Sprite ID in this atlas
Vertices = vertices,
TextureCoordinates = new Vector2[] {
new Vector2(punkLeft2, punkTop),
new Vector2(punkRight2, punkTop),
new Vector2(punkLeft2, punkBottom),
new Vector2(punkRight2, punkBottom),
},
Indices = new uint[] {
0,1,2,2,1,3
},
Size = new Vector2(99f, 75f)
}
},
// A texture path that will get loaded automatically when the atlas gets loaded
TextureName = "Textures/SplattyAtlas.tex",
// Our texels does not have premultiplied alpha
PremultipliedAlpha = false,
};
// Insert in temporary location and save to filesystem
sam.Insert("tmp", spriteAtlas);
sam.Save("tmp", PackageManager.BasePath + "Sprites/SplattySprites.spr");
sam.Remove("tmp");
}
public void EndBatch()
{
Render();
current = null;
}