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82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
// Copyright (C) 2008-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#pragma once
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#include "IReferenceCounted.h"
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#include "EHardwareBufferFlags.h"
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#include "EPrimitiveTypes.h"
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#include "SVertexIndex.h"
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namespace irr
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{
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namespace scene
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{
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class IIndexBuffer : public virtual IReferenceCounted
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{
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public:
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//! Get type of index data which is stored in this meshbuffer.
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/** \return Index type of this buffer. */
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virtual video::E_INDEX_TYPE getType() const = 0;
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//! Get access to indices.
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/** \return Pointer to indices array. */
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virtual const void *getData() const = 0;
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//! Get access to indices.
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/** \return Pointer to indices array. */
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virtual void *getData() = 0;
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//! Get amount of indices in this meshbuffer.
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/** \return Number of indices in this buffer. */
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virtual u32 getCount() const = 0;
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//! get the current hardware mapping hint
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virtual E_HARDWARE_MAPPING getHardwareMappingHint() const = 0;
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//! set the hardware mapping hint, for driver
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virtual void setHardwareMappingHint(E_HARDWARE_MAPPING newMappingHint) = 0;
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//! flags the meshbuffer as changed, reloads hardware buffers
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virtual void setDirty() = 0;
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//! Get the currently used ID for identification of changes.
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/** This shouldn't be used for anything outside the VideoDriver. */
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virtual u32 getChangedID() const = 0;
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//! Used by the VideoDriver to remember the buffer link.
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virtual void setHWBuffer(void *ptr) const = 0;
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virtual void *getHWBuffer() const = 0;
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//! Calculate how many geometric primitives would be drawn
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u32 getPrimitiveCount(E_PRIMITIVE_TYPE primitiveType) const
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{
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const u32 indexCount = getCount();
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switch (primitiveType) {
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case scene::EPT_POINTS:
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return indexCount;
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case scene::EPT_LINE_STRIP:
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return indexCount - 1;
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case scene::EPT_LINE_LOOP:
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return indexCount;
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case scene::EPT_LINES:
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return indexCount / 2;
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case scene::EPT_TRIANGLE_STRIP:
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return (indexCount - 2);
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case scene::EPT_TRIANGLE_FAN:
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return (indexCount - 2);
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case scene::EPT_TRIANGLES:
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return indexCount / 3;
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case scene::EPT_POINT_SPRITES:
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return indexCount;
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}
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return 0;
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}
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};
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} // end namespace scene
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} // end namespace irr
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