void AddSolidRoundedRect(float x, float y, float w, float h, float r)
{
if (_nextDrawCallIndex < MaxDrawCalls) {
EnsureRoomForVertices (12);
var b = _buffers[_currentBufferIndex];
var i = b.Length;
// At each corner, we put a little spike so that there
// is no seam between this and the corner arcs. (See FillRoundedRect)
// cr = r - ((r/2) + (r*cos45))/2
// cr = r * (1 - 0.25 - Cos45/2)
var cr = r * (1 - 0.25f - Cos45/2);
var ri = x + w;
var bo = y + h;
b.Positions[i] = new Vector2 (x + cr, y + cr);
b.Positions[i + 1] = new Vector2 (x, y + r);
b.Positions[i + 2] = new Vector2 (x, bo - r);
b.Positions[i + 3] = new Vector2 (x + cr, bo - cr);
b.Positions[i + 4] = new Vector2 (x + r, bo);
b.Positions[i + 5] = new Vector2 (ri - r, bo);
b.Positions[i + 6] = new Vector2 (ri - cr, bo - cr);
b.Positions[i + 7] = new Vector2 (ri, bo - r);
b.Positions[i + 8] = new Vector2 (ri, y + r);
b.Positions[i + 9] = new Vector2 (ri - cr, y + cr);
b.Positions[i + 10] = new Vector2 (ri - r, y);
b.Positions[i + 11] = new Vector2 (x + r, y);
var col = _color;
for (var j = 0; j < 12; j++) {
b.Colors[i + j] = col;
}
b.Length += 12;
var call = new OpenGLDrawArrayCall {
Operation = All.TriangleFan,
BufferIndex = (byte)_currentBufferIndex,
Offset = (ushort)i,
NumVertices = 12,
Texture = null,
};
_calls[_nextDrawCallIndex] = call;
_nextDrawCallIndex++;
}
}
void AddShape(OpenGLShape shape, float x, float y)
{
var tex = shape.TextureReference;
if (tex != null && tex.Texture != null && _nextDrawCallIndex < MaxDrawCalls) {
//
// Remember which shapes we're drawing so that they
// can be rendered into their textures
//
if (!_frameShapes.ContainsKey (shape)) {
_frameShapes.Add (shape, shape);
}
//
// Get a buffer with enough space
//
EnsureRoomForVertices (4);
var b = _buffers[_currentBufferIndex];
var i = b.Length;
//
// The position must be computed such that the point
// ShapeOffset is aligned to x, y
//
var tx = x - tex.ShapeOffset.X;
var ty = y - tex.ShapeOffset.Y;
b.Positions[i] = new Vector2 (tx, ty);
b.Positions[i + 1] = new Vector2 (tx, ty + tex.Height);
b.Positions[i + 2] = new Vector2 (tx + tex.Width, ty + tex.Height);
b.Positions[i + 3] = new Vector2 (tx + tex.Width, ty);
//
// TexCoords and Color are simple, you should be able to understand them ;-)
//
b.TexCoords[i] = new Vector2 (tex.U, tex.V);
b.TexCoords[i + 1] = new Vector2 (tex.U, tex.V + tex.TexHeight);
b.TexCoords[i + 2] = new Vector2 (tex.U + tex.TexWidth, tex.V + tex.TexHeight);
b.TexCoords[i + 3] = new Vector2 (tex.U + tex.TexWidth, tex.V);
b.Colors[i] = _color;
b.Colors[i + 1] = _color;
b.Colors[i + 2] = _color;
b.Colors[i + 3] = _color;
b.Length += 4;
//
// Record the draw call
//
var call = new OpenGLDrawArrayCall {
Operation = All.TriangleFan,
BufferIndex = (byte)_currentBufferIndex,
Offset = (ushort)i,
NumVertices = 4,
Texture = tex.Texture,
};
_calls[_nextDrawCallIndex] = call;
_nextDrawCallIndex++;
}
}
void AddSolidRect(float x, float y, float width, float height, float alpha = 1)
{
if (_nextDrawCallIndex < MaxDrawCalls) {
EnsureRoomForVertices (4);
var b = _buffers[_currentBufferIndex];
var i = b.Length;
b.Positions[i] = new Vector2 (x, y);
b.Positions[i + 1] = new Vector2 (x, y + height);
b.Positions[i + 2] = new Vector2 (x + width, y + height);
b.Positions[i + 3] = new Vector2 (x + width, y);
var col = _color;
if (alpha <= 0.9961f) {
col.A = (byte)(col.A * alpha);
}
b.Colors[i] = col;
b.Colors[i + 1] = col;
b.Colors[i + 2] = col;
b.Colors[i + 3] = col;
b.Length += 4;
var call = new OpenGLDrawArrayCall {
Operation = All.TriangleFan,
BufferIndex = (byte)_currentBufferIndex,
Offset = (ushort)i,
NumVertices = 4,
Texture = null,
};
_calls[_nextDrawCallIndex] = call;
_nextDrawCallIndex++;
}
}
void AddLine(float sx, float sy, float ex, float ey, float w, float alpha = 1)
{
if (_nextDrawCallIndex < MaxDrawCalls) {
EnsureRoomForVertices (3);
var b = _buffers[_currentBufferIndex];
var i = b.Length;
b.Positions[i] = new Vector2 (sx, sy);
b.Positions[i + 1] = new Vector2 (ex, ey);
b.Positions[i + 2] = new Vector2 (w * _zoom, 0); // Used to store info
var col = _color;
if (alpha <= 0.9961f) {
col.A = (byte)(col.A * alpha);
}
b.Colors[i] = col;
b.Colors[i + 1] = col;
b.Length += 3;
var call = new OpenGLDrawArrayCall {
Operation = All.Lines,
BufferIndex = (byte)_currentBufferIndex,
Offset = (ushort)i,
NumVertices = 2,
Texture = null,
};
_calls[_nextDrawCallIndex] = call;
_nextDrawCallIndex++;
}
}