TexturePainter.cpp

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// Copyright (C) 2005 Dave Griffiths
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include "State.h"
#include "TexturePainter.h"
#include "PNGLoader.h"
#include "SearchPaths.h"
#include <assert.h>

using namespace Fluxus;

TexturePainter *TexturePainter::m_Singleton=NULL;

TexturePainter::TexturePainter() 
{
}

TexturePainter::~TexturePainter()
{
}

void TexturePainter::Initialise()
{
    for (int c=0; c<MAX_TEXTURES; c++)
    {
        #ifdef ENABLE_MULTITEXTURE
        glActiveTexture(GL_TEXTURE0+c);
        glClientActiveTexture(GL_TEXTURE0+c);
        #endif
        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
                
        glMatrixMode(GL_TEXTURE);
        glLoadIdentity();
    }
    #ifdef ENABLE_MULTITEXTURE
    glClientActiveTexture(GL_TEXTURE0);
    #endif
}

void TexturePainter::ClearCache()
{
    m_TextureMap.clear();
    m_LoadedMap.clear();
    m_LoadedCubeMap.clear();
}

unsigned int TexturePainter::LoadTexture(const string &Filename, CreateParams &params)
{
    string Fullpath = SearchPaths::Get()->GetFullPath(Filename);
    
    if (params.Type==GL_TEXTURE_CUBE_MAP_POSITIVE_X || params.Type==GL_TEXTURE_CUBE_MAP_NEGATIVE_X ||
        params.Type==GL_TEXTURE_CUBE_MAP_POSITIVE_Y || params.Type==GL_TEXTURE_CUBE_MAP_NEGATIVE_Y ||
        params.Type==GL_TEXTURE_CUBE_MAP_POSITIVE_Z || params.Type==GL_TEXTURE_CUBE_MAP_NEGATIVE_Z)
    {
        return LoadCubeMap(Fullpath, params);
    }
    
    // see if we've loaded this one already
    map<string,int>::iterator i=m_LoadedMap.find(Fullpath);
    if (i!=m_LoadedMap.end())
    {
        return i->second;
    }
    
    unsigned char *ImageData;
    TextureDesc desc;
    ImageData=PNGLoader::Load(Fullpath,desc.Width,desc.Height,desc.Format);
    
    if (ImageData!=NULL)
    {
        //\todo support more depths than 8bit
        
        // upload to card...
        glEnable(params.Type);
        
        if (params.ID==-1) // is this a new texture?
        {
            GLuint id;
            glGenTextures(1,&id);
            params.ID=id; // ahem
            //\todo this means mipmap levels won't be cached
            m_TextureMap[params.ID]=desc;
            m_LoadedMap[Fullpath]=params.ID;                    
        }
                
        UploadTexture(desc,params,ImageData);                                       
        delete[] ImageData;
        return params.ID;       
    }   
    m_LoadedMap[Fullpath]=0;
    return 0;
}

unsigned int TexturePainter::LoadCubeMap(const string &Fullpath, CreateParams &params)
{   
    // see if we've loaded this one already
    map<string,int>::iterator i=m_LoadedCubeMap.find(Fullpath);
    if (i!=m_LoadedCubeMap.end())
    {
        return i->second;
    }

    unsigned char *ImageData;
    TextureDesc desc;
    ImageData=PNGLoader::Load(Fullpath,desc.Width,desc.Height,desc.Format);
    
    if (ImageData!=NULL)
    {
        //\todo support more depths than 8bit
        
        // upload to card...
        glEnable(params.Type);
        
        if (params.ID==-1) // is this a new texture?
        {
            GLuint id;
            glGenTextures(1,&id);
            params.ID=id; // ahem
            //\todo this means cubemaps won't be cached
            m_TextureMap[params.ID]=desc;
            m_LoadedCubeMap[Fullpath]=params.ID;
                        
            CubeMapDesc newcubemap;
            m_CubeMapMap[params.ID] = newcubemap;
                
            switch (params.Type) // record the cubemap face
            {
                case GL_TEXTURE_CUBE_MAP_POSITIVE_X: m_CubeMapMap[params.ID].Positive[0]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_NEGATIVE_X: m_CubeMapMap[params.ID].Negative[0]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_POSITIVE_Y: m_CubeMapMap[params.ID].Positive[1]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y: m_CubeMapMap[params.ID].Negative[1]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_POSITIVE_Z: m_CubeMapMap[params.ID].Positive[2]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z: m_CubeMapMap[params.ID].Negative[2]=params.ID; break;
                default: assert(0); break;
            }
        }
        else // we have an existing texture id specified
        {
            // make a new texture id for this face
            // record the primary cubemap id
            unsigned int primary = params.ID;
            GLuint id;
            glGenTextures(1,&id);
            params.ID=id; // ahem
            m_TextureMap[params.ID]=desc;
            m_LoadedCubeMap[Fullpath]=params.ID;

            switch (params.Type) // record the cubemap face
            {
                case GL_TEXTURE_CUBE_MAP_POSITIVE_X: m_CubeMapMap[primary].Positive[0]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_NEGATIVE_X: m_CubeMapMap[primary].Negative[0]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_POSITIVE_Y: m_CubeMapMap[primary].Positive[1]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y: m_CubeMapMap[primary].Negative[1]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_POSITIVE_Z: m_CubeMapMap[primary].Positive[2]=params.ID; break;
                case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z: m_CubeMapMap[primary].Negative[2]=params.ID; break;
                default: assert(0); break;
            }
        }
            
        UploadTexture(desc,params,ImageData);                   
        delete[] ImageData;
        return params.ID;       
    }   
    m_LoadedMap[Fullpath]=0;
    return 0;
}

void TexturePainter::UploadTexture(TextureDesc desc, CreateParams params, const unsigned char *ImageData)
{
    glBindTexture(params.Type,params.ID);
        
    if (params.GenerateMipmaps)
    {
        if (desc.Format==RGB)
        {
            gluBuild2DMipmaps(params.Type,3,desc.Width,desc.Height,GL_RGB,GL_UNSIGNED_BYTE,ImageData);
        }
        else
        {
            gluBuild2DMipmaps(params.Type,4,desc.Width,desc.Height,GL_RGBA,GL_UNSIGNED_BYTE,ImageData);
        }
    }
    else
    {       
        //\todo check power of two
        //\todo and scale?

        if (desc.Format==RGB)
        {               
            glTexImage2D(params.Type,params.MipLevel,3,desc.Width,desc.Height,params.Border,
                GL_RGB,GL_UNSIGNED_BYTE,ImageData);         
        }
        else
        {
            glTexImage2D(params.Type,params.MipLevel,4,desc.Width,desc.Height,params.Border,
                GL_RGBA,GL_UNSIGNED_BYTE,ImageData);
        }
    }       
}

bool TexturePainter::LoadPData(const string &Filename, unsigned int &w, unsigned int &h, TypedPData<dColour> &pixels)
{
    string Fullpath = SearchPaths::Get()->GetFullPath(Filename);

    unsigned char *ImageData;
    TextureDesc desc;
    ImageData=PNGLoader::Load(Fullpath,desc.Width,desc.Height,desc.Format);
    
    if (ImageData!=NULL)
    {
        pixels.Resize(desc.Width*desc.Height);
        w=desc.Width;
        h=desc.Height;

        if (desc.Format==RGB)
        {
            for (int n=0; n<desc.Width*desc.Height; n++)
            {
                pixels.m_Data[n]=dColour(ImageData[n*3]/255.0f, 
                                         ImageData[n*3+1]/255.0f,
                                         ImageData[n*3+2]/255.0f,1.0f);
                
            }   
        }   
        else if (desc.Format==RGBA)
        {
            for (int n=0; n<desc.Width*desc.Height; n++)
            {
                pixels.m_Data[n]=dColour(ImageData[n*4]/255.0f, 
                                         ImageData[n*4+1]/255.0f,
                                         ImageData[n*4+2]/255.0f,
                                         ImageData[n*4+3]/255.0f);
                
            }   
        }
        else
        {
            return false;
        }
            
        return true;
    }
    
    return false;
}

unsigned int TexturePainter::MakeTexture(unsigned int w, unsigned int h, PData *data)
{
    GLuint ID=0;
    TypedPData<dColour> *pixels = dynamic_cast<TypedPData<dColour>*>(data);
    if (pixels)
    {
        // upload to card...
        glGenTextures(1,&ID);
        glBindTexture(GL_TEXTURE_2D,ID);
        gluBuild2DMipmaps(GL_TEXTURE_2D,4,w,h,GL_RGBA,GL_FLOAT,&pixels->m_Data[0]);
        return ID;
    }
    return 0;
}

bool TexturePainter::SetCurrent(unsigned int *ids, TextureState *states)
{
    bool ret=false;
    
    for (int c=0; c<MAX_TEXTURES; c++)
    {
        #ifdef ENABLE_MULTITEXTURE
        glActiveTexture(GL_TEXTURE0+c);
        #endif
                
        if (ids[c]!=0)
        {
            map<unsigned int,CubeMapDesc>::iterator i=m_CubeMapMap.find(ids[c]);

            if (i!=m_CubeMapMap.end()) // cubemap texture path
            {
                glBindTexture(GL_TEXTURE_CUBE_MAP_POSITIVE_X,i->second.Positive[0]);
                glBindTexture(GL_TEXTURE_CUBE_MAP_NEGATIVE_X,i->second.Negative[0]);
                glBindTexture(GL_TEXTURE_CUBE_MAP_POSITIVE_Y,i->second.Positive[1]);
                glBindTexture(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,i->second.Negative[1]);
                glBindTexture(GL_TEXTURE_CUBE_MAP_POSITIVE_Z,i->second.Positive[2]);
                glBindTexture(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,i->second.Negative[2]);
                
                glEnable(GL_TEXTURE_CUBE_MAP);
                ApplyState(GL_TEXTURE_CUBE_MAP,states[c],true);                                                     
            }
            else // normal 2D texture path
            {
                glEnable(GL_TEXTURE_2D);
                glBindTexture(GL_TEXTURE_2D,ids[c]);                    
                ApplyState(GL_TEXTURE_2D,states[c],false);              
            }
            
            ret=true;                       
        }
        else
        {
            glDisable(GL_TEXTURE_2D);
            glDisable(GL_TEXTURE_CUBE_MAP);
        }
    }
    
    #ifdef ENABLE_MULTITEXTURE
    glActiveTexture(GL_TEXTURE0);
    #endif
    
    return ret;
}

void TexturePainter::ApplyState(int type, TextureState &state, bool cubemap)
{
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, state.TexEnv);
    glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, state.EnvColour.arr());
    glTexParameteri(type, GL_TEXTURE_MIN_FILTER, state.Min);
    glTexParameteri(type, GL_TEXTURE_MAG_FILTER, state.Mag);    
    glTexParameteri(type, GL_TEXTURE_WRAP_S, state.WrapS);
    glTexParameteri(type, GL_TEXTURE_WRAP_T, state.WrapT);
    if (cubemap) glTexParameteri(type, GL_TEXTURE_WRAP_R, state.WrapT);
    glTexParameterfv(type, GL_TEXTURE_BORDER_COLOR, state.BorderColour.arr());
    glTexParameterf(type, GL_TEXTURE_PRIORITY, state.Priority);
    glTexParameterf(type, GL_TEXTURE_MIN_LOD, state.MinLOD);
    glTexParameterf(type, GL_TEXTURE_MAX_LOD, state.MaxLOD);
}

void TexturePainter::DisableAll()
{
    #ifdef ENABLE_MULTITEXTURE
    for (int c=0; c<MAX_TEXTURES; c++)
    {
        glActiveTexture(GL_TEXTURE0+c);
        glDisable(GL_TEXTURE_2D);
    }
    glClientActiveTexture(GL_TEXTURE0);
    #else
    glDisable(GL_TEXTURE_2D);
    #endif
}

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