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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef GRASSDRAWER_H
#define GRASSDRAWER_H
#include <vector>
#include "System/float3.h"
#include "System/EventClient.h"
namespace Shader {
struct IProgramObject;
}
class CVertexArray;
struct VA_TYPE_TN;
class CGrassDrawer : public CEventClient
{
public:
CGrassDrawer();
~CGrassDrawer();
void Draw();
void DrawShadow();
void AddGrass(const float3& pos);
void ResetPos(const float3& pos);
void RemoveGrass(const float3& pos);
void ChangeDetail(int detail);
/// @see ConfigHandler::ConfigNotifyCallback
void ConfigNotify(const std::string& key, const std::string& value);
public:
// EventClient
void UnsyncedHeightMapUpdate(const SRectangle& rect);
void Update();
public:
struct InviewNearGrass {
int x;
int y;
float dist;
};
struct GrassStruct {
GrassStruct()
: posX(0)
, posZ(0)
, va(nullptr)
, lastSeen(0)
, lastDist(0.f)
{}
~GrassStruct();
int posX, posZ;
CVertexArray* va;
int lastSeen;
float lastDist;
};
enum GrassShaderProgram {
GRASS_PROGRAM_NEAR = 0,
GRASS_PROGRAM_DIST = 1,
GRASS_PROGRAM_SHADOW_GEN = 2,
GRASS_PROGRAM_LAST = 3
};
protected:
void LoadGrassShaders();
void CreateGrassBladeTex(unsigned char* buf);
void CreateFarTex();
void CreateGrassDispList(int listNum);
void EnableShader(const GrassShaderProgram type);
void SetupGlStateNear();
void ResetGlStateNear();
void SetupGlStateFar();
void ResetGlStateFar();
void DrawNear(const std::vector<InviewNearGrass>& inviewGrass);
void DrawFarBillboards(const std::vector<GrassStruct*>& inviewGrass);
void DrawNearBillboards(const std::vector<InviewNearGrass>& inviewNearGrass);
void DrawBillboard(const int x, const int y, const float dist, VA_TYPE_TN* va_tn);
void ResetPos(const int grassBlockX, const int grassBlockZ);
protected:
friend class CGrassBlockDrawer;
bool grassOff;
int blocksX;
int blocksY;
unsigned int grassDL;
unsigned int grassBladeTex;
unsigned int farTex;
CVertexArray* farnearVA;
std::vector<Shader::IProgramObject*> grassShaders;
Shader::IProgramObject* grassShader;
float maxGrassDist;
float maxDetailedDist;
int detailedBlocks;
int numTurfs;
int strawPerTurf;
float3 oldCamPos;
float3 oldCamDir;
int lastVisibilityUpdate;
bool updateBillboards;
std::vector<GrassStruct> grass;
unsigned char* grassMap;
};
extern CGrassDrawer* grassDrawer; //FIXME can be nullptr
#endif /* GRASSDRAWER_H */
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