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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef TERRAIN_TEXTURES_H
#define TERRAIN_TEXTURES_H
#include <string>
#include "Rendering/GL/myGL.h"
class TdfParser;
class CBitmap;
namespace terrain {
struct ILoadCallback;
struct Heightmap;
class TQuad;
struct float2
{
float2() : x(0.0f), y(0.0f) {}
float2(float x, float y) : x(x), y(y) {}
float x;
float y;
};
//-----------------------------------------------------------------------
// AlphaImage - a single channel image class, used for storing blendmaps
//-----------------------------------------------------------------------
struct AlphaImage {
AlphaImage();
~AlphaImage();
enum AreaTestResult {
AREA_ONE, AREA_ZERO, AREA_MIXED
};
void Alloc(int w, int h);
float& at(int x, int y) { return data[y*w + x]; }
bool CopyFromBitmap(CBitmap& bm);
AlphaImage* CreateMipmap();
void Blit(AlphaImage* dst, int x, int y, int dstx, int dsty, int w, int h);
bool Save(const char* fn);
AreaTestResult TestArea(int xstart, int ystart, int xend, int yend, float epsilon);
int w;
int h;
float* data;
// geo-mip-map chain links
AlphaImage* lowDetail;
AlphaImage* highDetail;
};
//-----------------------------------------------------------------------
// BaseTexture
//-----------------------------------------------------------------------
struct BaseTexture
{
BaseTexture();
virtual ~BaseTexture();
virtual bool ShareTexCoordUnit() { return true; }
// the "texgen vector" is defined as:
// { Xfactor, Zfactor, Xoffset, Zoffset }
virtual void CalcTexGenVector(float* v4);
virtual void SetupTexGen();
virtual bool IsRect() { return false; }
std::string name;
GLuint id;
float2 tilesize;
};
struct TiledTexture : public BaseTexture
{
TiledTexture();
~TiledTexture();
void Load(const std::string& name, const std::string& section, ILoadCallback* cb, const TdfParser* tdf, bool isBumpmap);
static TiledTexture* CreateFlatBumpmap();
};
struct Blendmap : public BaseTexture
{
Blendmap();
~Blendmap();
void Generate(Heightmap* rootHm, int lodLevel, float hmscale, float hmoffset);
void Load(const std::string& name, const std::string& section, Heightmap* heightmap, ILoadCallback* cb, const TdfParser* tdf);
struct GeneratorInfo {
float coverage, noise;
float minSlope, maxSlope;
float minSlopeFuzzy, maxSlopeFuzzy;
float minHeight, maxHeight;
float minHeightFuzzy, maxHeightFuzzy;
};
GeneratorInfo* generatorInfo;
AlphaImage* image; // WIP image pointer
AlphaImage::AreaTestResult curAreaResult;
};
/**
* A bumpmap generated from a heightmap, used to increase detail on distant
* nodes.
*/
struct DetailBumpmap : public BaseTexture
{
~DetailBumpmap();
void CalcTexGenVector(float* v4);
bool ShareTexCoordUnit() { return false; }
TQuad* node;
};
GLuint LoadTexture(const std::string& fn, bool isBumpmap = false);
void SaveImage(const char* fn, int components, GLenum type, int w, int h, void* data);
void SetTexCoordGen(float* tgv);
};
#endif
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