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Renderable.h
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Renderable.h
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#ifndef _ECHORENDERABLE_H_
#define _ECHORENDERABLE_H_
#include <echo/Graphics/Colour.h>
#include <echo/Graphics/RenderContext.h>
namespace Echo
{
class Matrix4;
class RenderTarget;
/**
* Defines the interface to a Renderable object.
* A Renderable requires that the RenderTarget be set up with the appropriate perspective matrix.
*/
class Renderable
{
public:
Renderable();
virtual ~Renderable();
/**
* Render the object.
* The implementation should, at some point, call renderTarget.SetModelViewMatrix() to set the
* matrix in the render system that will be applied to any vertices rendered.
*
* Rendering usually consists of setting the model-view matrix, setting the render system
* parameters to modify how things will be rendered, then a call to DrawTriangles() or other
* Draw method.
*
* There are higher level classes that take care of rendering for you so you can focus on what
* and where to render things. For example you can use a SceneEntity and give it a Mesh to
* render.
*
* @param renderContext a reference to an object that holds references to rendering relevant
* objects such as the RenderTarget, Camera, and matrices.
* render target via renderTarget.SetModelViewMatrix(). Usually the matrix passed in is a view
* matrix from a camera which can be combined with the object's local transform (if it has one)
* before being used.
* @param renderTarget The render target that will be responsible for performing render operations.
* @param compoundDiffuse The caller can provide a colour that they want the object to use for
* rendering. The actual behaviour is up to the implementation. If you're not sure what to use
* pass Colour::WHITE.
*/
virtual void Render(RenderContext& renderContext, Colour compoundDiffuse) = 0;
};
}
#endif

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