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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 <array>
#include <vector>
#include "Rendering/GL/RenderDataBuffer.hpp"
#include "System/float3.h"
#include "System/type2.h"
#include "System/EventClient.h"
namespace Shader {
struct IProgramObject;
}
class CCamera;
class CGrassDrawer : public CEventClient
{
public:
CGrassDrawer();
~CGrassDrawer();
void Draw();
void DrawShadow();
void AddGrass(const float3& pos);
void RemoveGrass(const float3& pos);
uint8_t GetGrass(const float3& pos);
float IncrDrawDistance();
float DecrDrawDistance();
void ChangeDetail(int detail);
/// @see ConfigHandler::ConfigNotifyCallback
void ConfigNotify(const std::string& key, const std::string& value);
void HandleAction(int arg) {
switch (arg) {
case -1: { defDrawGrass = !defDrawGrass; luaDrawGrass = !luaDrawGrass; } break;
case 0: { defDrawGrass = false; luaDrawGrass = false; } break;
case 1: { defDrawGrass = true; luaDrawGrass = false; } break;
case 2: { defDrawGrass = false; luaDrawGrass = true; } break;
default: { } break;
}
}
bool DefDrawGrass() const { return defDrawGrass; }
bool LuaDrawGrass() const { return luaDrawGrass; }
public:
// EventClient
void UnsyncedHeightMapUpdate(const SRectangle& rect) override {}
void Update() override;
protected:
enum GrassShaderProgram {
GRASS_PROGRAM_OPAQUE = 0,
GRASS_PROGRAM_SHADOW = 1,
GRASS_PROGRAM_CURR = 2,
GRASS_PROGRAM_LAST = 3,
};
bool LoadGrassShaders();
void CreateGrassBladeTex(uint8_t* buf);
void CreateGrassBuffer();
void EnableShader(const GrassShaderProgram type);
void SetupStateOpaque();
void ResetStateOpaque();
void SetupStateShadow();
void ResetStateShadow();
unsigned int DrawBlock(const float3& camPos, const int2& blockPos, unsigned int turfMatIndex);
void DrawBlocks(const CCamera* cam);
protected:
int2 blockCount;
int2 turfDetail;
unsigned int grassBladeTex = 0;
std::vector<int2> grassBlocks;
std::vector<uint8_t> grassMap;
std::array<Shader::IProgramObject*, GRASS_PROGRAM_LAST> grassShaders;
GL::RenderDataBuffer grassBuffer;
float grassDrawDist;
float maxDetailedDist;
float3 prvUpdateCamPos;
float3 prvUpdateCamDir;
bool luaDrawGrass = false;
bool defDrawGrass = false;
bool updateVisibility = false;
};
extern CGrassDrawer* grassDrawer;
#endif /* GRASSDRAWER_H */
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