genesis-3d_engine/Engine/graphicsystem/Renderable/QuadRenderable.cc

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU

http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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THE SOFTWARE.
****************************************************************************/
#include "stdneb.h"
#include "QuadRenderable.h"
#include "foundation/meshbuilder/parallelogrambuilder.h"
#include "GraphicSystem.h"

namespace Graphic
{

	using namespace Math;
	using namespace RenderBase;
	struct _vertex
	{
	public:
		Math::float3 position;
		Math::float2 uv;
	};

	__ImplementClass(QuadRenderable,'QRGS',Core::RefCounted)

		QuadRenderable::QuadRenderable()
		: m_Width(1),
		m_Height(1)
	{
		m_handle = RenderBase::PrimitiveHandle();
		GraphicSystem::Instance()->AddQuadRenderable(this);
	}
	QuadRenderable::~QuadRenderable()
	{
		Discard();
	}

	void QuadRenderable::Discard()
	{		
		if (m_handle.IsValid())
		{
			GraphicSystem::Instance()->RemovePrimitive(m_handle);
			m_handle = RenderBase::PrimitiveHandle();
		}
	}

	void QuadRenderable::Setup(int width, int height)
	{
		GraphicSystem* gs = GraphicSystem::Instance();

		Discard();
		m_Width  = width;
		m_Height = height;

		float widthPixel = gs->GetHorizontalTexelOffset() * 2.0f / width;
		float heightPixel = gs->GetVerticalTexelOffset() * 2.0f / height;
		n_assert(!m_handle.IsValid());

		VertexBufferData2 vbd2;
		IndexBufferData2 ibd2;

		RenderBase::VertexComponents& vertexComponents = vbd2.GetVertexComponents();
		vertexComponents.Append(VertexComponent(VertexComponent::Position,0, VertexComponent::Float3));
		vertexComponents.Append(VertexComponent(VertexComponent::TexCoord,0, VertexComponent::Float2));
		n_assert(!m_handle.IsValid());

		vbd2.Setup(RECT_VERTEX_COUNT, sizeof(_vertex), 
			RenderBase::BufferData::Static, RenderBase::PrimitiveTopology::TriangleList, true);
		ibd2.Setup(RECT_INDICES_COUNT, RenderBase::BufferData::Static, RenderBase::IndexBufferData::Int16, true);

		_vertex* vs = vbd2.GetBufferPtr<_vertex>();
#if RENDERDEVICE_OPENGLES
		vs[0].uv = Math::float2(0,1);
		vs[1].uv = Math::float2(1,1);
		vs[2].uv = Math::float2(0,0);
		vs[3].uv = Math::float2(1,0);
#else
		vs[0].uv = Math::float2(0,0);
		vs[1].uv = Math::float2(1,0);
		vs[2].uv = Math::float2(0,1);
		vs[3].uv = Math::float2(1,1);
#endif
		// offset vertices
		float3 top(0.0f, 1.0f, 0.0f);
		float3 right(1.0f, 0.0f, 0.0f);
		float3 center(0.0f, 0.0f, 0.0f);
		MeshBuilder::ParallelogramBuilder::Set(vs, top, right, center, 0);

		for (int i = 0; i < RECT_VERTEX_COUNT; i++)
		{
			vs[i].position.x() += widthPixel;
			vs[i].position.y() -= heightPixel;
		}

		ushort* indices = ibd2.GetBufferPtr<ushort>();
		MeshBuilder::ParallelogramBuilder::SetIndices(indices);

		m_handle = gs->CreatePrimitiveHandle(&vbd2, &ibd2);

	}
}