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#pragma once
#include "SceneNode.h"
#include "../Primitives/Rect.h"
#include "RenderCommand.h"
namespace nCine
{
class RenderCommand;
class RenderQueue;
/// Object that can be drawn through the render queue
class DrawableNode : public SceneNode
{
friend class ShaderState;
friend class Viewport;
public:
/** @{ @name Constants */
// Notable anchor points for a drawable node
static const Vector2f AnchorCenter;
static const Vector2f AnchorBottomLeft;
static const Vector2f AnchorTopLeft;
static const Vector2f AnchorBottomRight;
static const Vector2f AnchorTopRight;
/** @} */
/// Presets for blending factors
enum class BlendingPreset
{
DISABLED, ///< uses `GL_ONE` and `GL_ZERO`
ALPHA, ///< uses `GL_SRC_ALPHA` and `GL_ONE_MINUS_SRC_ALPHA`
PREMULTIPLIED_ALPHA, ///< uses `GL_ONE` and `GL_ONE_MINUS_SRC_ALPHA`
ADDITIVE, ///< uses `GL_SRC_ALPHA` and `GL_ONE`
MULTIPLY ///< uses `GL_DST_COLOR` and `GL_ZERO`
};
/// OpenGL blending factors
enum class BlendingFactor
{
ZERO,
ONE,
SRC_COLOR,
ONE_MINUS_SRC_COLOR,
DST_COLOR,
ONE_MINUS_DST_COLOR,
SRC_ALPHA,
ONE_MINUS_SRC_ALPHA,
DST_ALPHA,
ONE_MINUS_DST_ALPHA,
CONSTANT_COLOR,
ONE_MINUS_CONSTANT_COLOR,
CONSTANT_ALPHA,
ONE_MINUS_CONSTANT_ALPHA,
SRC_ALPHA_SATURATE,
};
/// Constructor for a drawable node with a parent and a specified relative position
DrawableNode(SceneNode* parent, float xx, float yy);
/// Constructor for a drawable node with a parent and a specified relative position as a vector
DrawableNode(SceneNode* parent, Vector2f position);
/// Constructor for a drawable node with a parent and positioned in the relative origin
explicit DrawableNode(SceneNode* parent);
/// Constructor for a drawable node with no parent and positioned in the origin
DrawableNode();
~DrawableNode() override;
DrawableNode& operator=(const DrawableNode&) = delete;
DrawableNode(DrawableNode&&);
DrawableNode& operator=(DrawableNode&&);
/// Updates the draw command and adds it to the queue
bool OnDraw(RenderQueue& renderQueue) override;
/// Returns the width of the node area
inline virtual float width() const {
return width_ * scaleFactor_.X;
}
/// Returns the height of the node area
inline virtual float height() const {
return height_ * scaleFactor_.Y;
}
/// Returns the size of the node area
inline Vector2f size() const {
return Vector2f(width(), height());
}
/// Returns the absolute width of the node area
inline virtual float absWidth() const {
return width_ * absScaleFactor_.X;
}
/// Returns the absolute height of the node area
inline virtual float absHeight() const {
return height_ * absScaleFactor_.Y;
}
/// Returns the absolute size of the node area
inline Vector2f absSize() const {
return Vector2f(absWidth(), absHeight());
}
/// Gets the transformation anchor point
inline Vector2f anchorPoint() const {
return (anchorPoint_ / size()) + 0.5f;
}
/// Sets the transformation anchor point
void setAnchorPoint(float xx, float yy);
/// Sets the transformation anchor point with a `Vector2f`
inline void setAnchorPoint(Vector2f point) {
setAnchorPoint(point.X, point.Y);
}
/// Returns true if the node renders with blending enabled
bool isBlendingEnabled() const;
/// Sets the blending state for node rendering
void setBlendingEnabled(bool blendingEnabled);
/// Returns the source blending factor
BlendingFactor srcBlendingFactor() const;
/// Returns the destination blending factor
BlendingFactor destBlendingFactor() const;
/// Sets a blending preset for source and destination blending factors
void setBlendingPreset(BlendingPreset blendingPreset);
/// Sets a specific source and destination blending factors
void setBlendingFactors(BlendingFactor srcBlendingFactor, BlendingFactor destBlendingFactor);
/// Returns the last frame in which any of the viewports have rendered this node (node was not culled)
inline std::uint32_t lastFrameRendered() const {
return lastFrameRendered_;
}
/// Returns the axis-aligned bounding box of the node area in the last frame
inline Rectf aabb() const {
return aabb_;
}
protected:
/// Node width in pixel
float width_;
/// Node height in pixel
float height_;
/// The render command class associated with this node
RenderCommand renderCommand_;
/// The last frame any viewports rendered this node
std::uint32_t lastFrameRendered_;
/// Axis-aligned bounding box of the node area
Rectf aabb_;
/// Calculates updated values for the AABB
virtual void updateAabb();
/// Called by each viewport update method to update a node culling state
void updateCulling();
/// Protected copy constructor used to clone objects
DrawableNode(const DrawableNode& other);
/// Performs the required tasks upon a change to the shader
virtual void shaderHasChanged() = 0;
/// Updates the render command
virtual void updateRenderCommand() = 0;
};
}
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