public void Setup(RenderState state, Matrix modelViewMatrix, float alpha, uint blendMode)
{
Alpha = alpha * state.Alpha;
BlendMode = blendMode == Sparrow.Display.BlendMode.AUTO ? state.BlendMode : blendMode;
ModelViewMatrix.CopyFromMatrix(state.ModelViewMatrix);
ModelViewMatrix.PrependMatrix(modelViewMatrix);
}
/// <summary>
/// Restores the previous render state.
/// </summary>
public void PopState()
{
if (_stateStack.Count == 0)
{
throw new InvalidOperationException("The state stack must not be empty");
}
_stateStackTop = _stateStack[--_stateStackIndex];
}
/// <summary>
/// Adds a new render state to the stack. The passed matrix is prepended to the modelview matrix;
/// the alpha value is multiplied with the current alpha; the blend mode replaces the existing
/// mode (except 'BlendMode.Auto', which will cause the current mode to prevail).
/// </summary>
public void PushState(Matrix matrix, float alpha, uint blendMode)
{
RenderState previousState = _stateStackTop;
if (_stateStackSize == _stateStackIndex + 1)
{
_stateStack.Add(new RenderState());
_stateStackSize++;
}
_stateStackTop = _stateStack[++_stateStackIndex];
_stateStackTop.Setup(previousState, matrix, alpha, blendMode);
}
/// <summary>
/// Resets the render state stack to the default.
/// </summary>
public void NextFrame()
{
_clipRectStackSize = 0;
_stateStackIndex = 0;
_quadBatchIndex = 0;
_numDrawCalls = 0;
_quadBatchTop = _quadBatches[0];
_stateStackTop = _stateStack[0];
}
public RenderSupport()
{
_projectionMatrix = Matrix.Create();
_mvpMatrix = Matrix.Create();
_stateStack = new List<RenderState> { new RenderState() };
_stateStackIndex = 0;
_stateStackSize = 1;
_stateStackTop = _stateStack[0];
_quadBatches = new List<QuadBatch> { new QuadBatch() };
_quadBatchIndex = 0;
_quadBatchSize = 1;
_quadBatchTop = _quadBatches[0];
_clipRectStack = new List<Rectangle>();
_clipRectStackSize = 0;
SetupOrthographicProjection(0, 320, 0, 480);
}
