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/* Copyright (C) 2012 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_PATCHRDATA
#define INCLUDED_PATCHRDATA
#include <vector>
#include "graphics/SColor.h"
#include "maths/Vector3D.h"
#include "graphics/RenderableObject.h"
#include "graphics/ShaderProgram.h"
#include "VertexBufferManager.h"
class CPatch;
class CTerrainTextureEntry;
class CTextRenderer;
//////////////////////////////////////////////////////////////////////////////////////////////////
// CPatchRData: class encapsulating logic for rendering terrain patches; holds per
// patch data, plus some supporting static functions for batching, etc
class CPatchRData : public CRenderData
{
public:
CPatchRData(CPatch* patch);
~CPatchRData();
void Update();
void RenderOutline();
void RenderSides(CShaderProgramPtr& shader);
void RenderPriorities(CTextRenderer& textRenderer);
void RenderWater(CShaderProgramPtr& shader);
static void RenderBases(const std::vector<CPatchRData*>& patches, const CShaderProgramPtr& shader, bool isDummyShader);
static void RenderBlends(const std::vector<CPatchRData*>& patches, const CShaderProgramPtr& shader, bool isDummyShader);
static void RenderStreams(const std::vector<CPatchRData*>& patches, const CShaderProgramPtr& shader, int streamflags);
CPatch* GetPatch() { return m_Patch; }
const CBoundingBoxAligned& GetWaterBounds() const { return m_WaterBounds; }
private:
friend struct SBlendStackItem;
struct SSplat {
SSplat() : m_Texture(0), m_IndexCount(0) {}
// texture to apply during splat
CTerrainTextureEntry* m_Texture;
// offset into the index array for this patch where splat starts
size_t m_IndexStart;
// number of indices used by splat
size_t m_IndexCount;
};
struct SBaseVertex {
// vertex position
CVector3D m_Position;
// diffuse color from sunlight
SColor4ub m_DiffuseColor;
};
cassert(sizeof(SBaseVertex) == 16);
struct SSideVertex {
// vertex position
CVector3D m_Position;
// add some padding
u32 m_Padding[1];
};
cassert(sizeof(SSideVertex) == 16);
struct SBlendVertex {
// vertex position
CVector3D m_Position;
// diffuse color from sunlight
SColor4ub m_DiffuseColor;
// vertex uvs for alpha texture
float m_AlphaUVs[2];
// add some padding since VBOs prefer power-of-two sizes
u32 m_Padding[2];
};
cassert(sizeof(SBlendVertex) == 32);
// Mixed Fancy/Simple water vertex description data structure
struct SWaterVertex {
// vertex position
CVector3D m_Position;
// (p,q,r, a) where
// p*255 + q*-255 + r = depth of water
// a = depth-dependent alpha
SColor4ub m_DepthData;
};
cassert(sizeof(SWaterVertex) == 16);
// build this renderdata object
void Build();
void AddBlend(std::vector<SBlendVertex>& blendVertices, std::vector<u16>& blendIndices, u16 i, u16 j, u8 shape);
void BuildBlends();
void BuildIndices();
void BuildVertices();
void BuildSides();
void BuildSide(std::vector<SSideVertex>& vertices, CPatchSideFlags side);
// owner patch
CPatch* m_Patch;
// vertex buffer handle for side vertices
CVertexBuffer::VBChunk* m_VBSides;
// vertex buffer handle for base vertices
CVertexBuffer::VBChunk* m_VBBase;
// vertex buffer handle for base vertex indices
CVertexBuffer::VBChunk* m_VBBaseIndices;
// vertex buffer handle for blend vertices
CVertexBuffer::VBChunk* m_VBBlends;
// vertex buffer handle for blend vertex indices
CVertexBuffer::VBChunk* m_VBBlendIndices;
// list of base splats to apply to this patch
std::vector<SSplat> m_Splats;
// splats used in blend pass
std::vector<SSplat> m_BlendSplats;
// boundary of water in this patch
CBoundingBoxAligned m_WaterBounds;
// Water vertex buffer
CVertexBuffer::VBChunk* m_VBWater;
// Water indices buffer
CVertexBuffer::VBChunk* m_VBWaterIndices;
// Build water vertices and indices (vertex buffer and data vector)
void BuildWater();
// parameter allowing a varying number of triangles per patch for LOD
// MUST be an exact divisor of PATCH_SIZE
// compiled const for the moment until/if dynamic water LOD is offered
// savings would be mostly beneficial for GPU or simple water
static const ssize_t water_cell_size = 1;
};
#endif
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