163 lines
6.7 KiB
C++
163 lines
6.7 KiB
C++
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/**************************************************************************************/
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/* */
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/* Visualization Library */
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/* http://visualizationlibrary.org */
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/* */
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/* Copyright (c) 2005-2020, Michele Bosi */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without modification, */
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/* are permitted provided that the following conditions are met: */
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/* */
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/* - Redistributions of source code must retain the above copyright notice, this */
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/* list of conditions and the following disclaimer. */
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/* */
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/* - Redistributions in binary form must reproduce the above copyright notice, this */
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/* list of conditions and the following disclaimer in the documentation and/or */
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/* other materials provided with the distribution. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND */
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/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR */
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/* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES */
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/* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/**************************************************************************************/
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#ifndef DrawArrays_INCLUDE_DEFINE
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#define DrawArrays_INCLUDE_DEFINE
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#include <vlGraphics/DrawCall.hpp>
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#include <vlGraphics/TriangleIterator.hpp>
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namespace vl
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{
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//------------------------------------------------------------------------------
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// DrawArrays
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//------------------------------------------------------------------------------
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/**
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* Wraps the OpenGL function glDrawArrays(). See vl::DrawCall for an overview of the different draw call methods.
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*
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* This class wraps the following OpenGL functions:
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* - glDrawArrays (http://www.opengl.org/sdk/docs/man4/xhtml/glDrawArrays.xml)
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* - glDrawArraysInstanced (http://www.opengl.org/sdk/docs/man4/xhtml/glDrawArraysInstanced.xml)
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*
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* Supports:
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* - <b>Multi instancing</b>: YES
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* - <b>Base vertex</b>: N/A
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* - <b>Primitive restart</b>: N/A
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*
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* DrawArrays, DrawElements, MultiDrawElements and DrawRangeElements are used by Geometry to define a set of primitives to be rendered.
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* @sa Geometry::drawCalls(), DrawCall, DrawElements, MultiDrawElements, DrawRangeElements, Geometry, Actor */
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class DrawArrays: public DrawCall
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{
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VL_INSTRUMENT_CLASS(vl::DrawArrays, DrawCall)
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public:
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DrawArrays(): mStart(0), mCount(0)
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{
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VL_DEBUG_SET_OBJECT_NAME()
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mType = PT_TRIANGLES;
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mInstances = 1;
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}
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DrawArrays(EPrimitiveType primitive, int start, int count, int instances=1)
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: mStart(start), mCount(count)
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{
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VL_DEBUG_SET_OBJECT_NAME()
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mInstances = instances;
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mType = primitive;
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}
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DrawArrays& operator=(const DrawArrays& other)
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{
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super::operator=(other);
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mStart = other.mStart;
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mCount = other.mCount;
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mInstances = other.mInstances;
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return *this;
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}
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virtual ref<DrawCall> clone() const
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{
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return new DrawArrays( primitiveType(), (int)start(), (int)count(), (int)instances() );
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}
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virtual void deleteBufferObject() {}
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virtual void updateDirtyBufferObject(EBufferObjectUpdateMode) {}
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virtual void render(bool) const
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{
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VL_CHECK_OGL()
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// apply patch parameters if any and if using PT_PATCHES
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applyPatchParameters();
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if ( instances() > 1 && (Has_GL_ARB_draw_instanced||Has_GL_EXT_draw_instanced) )
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VL_glDrawArraysInstanced( primitiveType(), (int)start(), (int)count(), (int)instances() );
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else
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glDrawArrays( primitiveType(), (int)start(), (int)count() );
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#ifndef NDEBUG
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unsigned int glerr = glGetError();
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if (glerr != GL_NO_ERROR)
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{
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String msg( getGLErrorString(glerr) );
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Log::error( Say("glGetError() [%s:%n]: %s\n") << __FILE__ << __LINE__ << msg );
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Log::warning( "- If you are using geometry instancing in conjunction with display lists you will have to disable one of them.\n" );
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Log::warning( "- If you are using OpenGL ES you must NOT use GL_QUADS, GL_QUAD_STRIP and GL_POLYGON primitive types.\n" );
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VL_TRAP()
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}
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#endif
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}
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//! sets the starting vertex for the rendering.
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void setStart(int start) { mStart = start; }
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//! returns the starting vertex for the rendering.
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int start() const { return mStart; }
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//! sets the number of vertices to be rendered.
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void setCount(int count) { mCount = count; }
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//! returns the number of vertices to be rendered.
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int count() const { return mCount; }
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//! Sets the number of instances for this set of primitives.
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void setInstances(int instances) { mInstances = instances; }
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//! Returns the number of instances for this set of primitives.
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int instances() const { return mInstances; }
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TriangleIterator triangleIterator() const
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{
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ref<TriangleIteratorDirect> tid = new TriangleIteratorDirect( primitiveType() );
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tid->initialize(mStart, mStart+mCount);
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return TriangleIterator(tid.get());
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}
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IndexIterator indexIterator() const
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{
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ref<IndexIteratorDrawArrays> iida = new IndexIteratorDrawArrays;
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iida->initialize( mStart, mCount );
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IndexIterator iit;
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iit.initialize( iida.get() );
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return iit;
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}
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protected:
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int mStart;
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int mCount;
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int mInstances;
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};
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}
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#endif
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