#include "ps1.0_program.h"

#include "nvparse_errors.h"
#include "nvparse_externs.h"

#include <string>
#include <map>
#include <algorithm>
#include <string.h>
#include <set>


using namespace std;
using namespace ps10;
struct ltstr
{
    bool operator()(const char* s1, const char* s2) const
    {
        return strcmp(s1, s2) < 0;
    }
};

#define DBG_MESG(msg, line)     errors.set(msg, line)
//#define DBG_MESG(msg, line)
namespace ps10
{
    std::map<int, std::pair<int,int> > constToStageAndConstMap;
    std::vector<int> constToStageArray;
    std::map<int, int> stageToConstMap; // to keep track of which constants have been used up for this stage.
        // r-value of 0 means none, r-value of 1 means c0 used, and r-value of 2 means both used.
    //std::map<int, int> constToStageMap;
    std::map<int, GLenum> stageToTargetMap;
    std::set<const char*, ltstr> alphaBlueRegisters; // Keeps track of whether the result of a register
        // was a dp3, if a register is in this set, it means that if it is used a source for the alpha 
        // component the blue component should be used, and not the alpha component.
    void SetFinalCombinerStage();
}

void RemoveFromAlphaBlue(std::string s)
{
    std::set<const char*, ltstr>::iterator iter = 
        ps10::alphaBlueRegisters.find(s.c_str());
    if (iter != alphaBlueRegisters.end())
        alphaBlueRegisters.erase(iter);
}

/*
void AddToMap(string s, int stage)
{
    const char* cstr = s.c_str();
    if (cstr[0] == 'c')
    {
        int constNum = atoi(&cstr[1]);
        if (constNum < 0 || constNum > 7)
            return;
        constToStageMap[constNum] = stage;
    }
}
*/

bool AddToMap(string s, int stage, GLenum& constVal)
{
    const char* cstr = s.c_str();
    if (cstr[0] == 'c')
    {
        int constNum = atoi(&cstr[1]);
        std::map<int, int>::iterator iter = stageToConstMap.find(stage);
        if (iter == stageToConstMap.end())
        {
            // no constants used for this stage. 
            std::pair<int, int> temp;
            temp.first = stage;
            temp.second = 0;
            constToStageAndConstMap[constNum] = temp;
            stageToConstMap[stage] = 0;
            constVal = 0;
            constToStageArray.push_back(constNum);
            constToStageArray.push_back(stage);
            constToStageArray.push_back(constVal);
        }
        else
        {
            int constUsed = (*iter).second;
            if (constUsed >= 1)
                return false;
            else // const0 has been used, so use const1 for this stage.
            {
                std::pair<int,int> temp;
                temp.first = stage;
                temp.second = 1;
                constToStageAndConstMap[constNum] = temp;
                stageToConstMap[stage] = 1;
                constVal = 1;
                constToStageArray.push_back(constNum);
                constToStageArray.push_back(stage);
                constToStageArray.push_back(constVal);
            }
            
        }
    }
    constVal += GL_CONSTANT_COLOR0_NV;
    return true;
}

bool IsLegalTarget(int target)
{
    if (target == GL_TEXTURE_CUBE_MAP_ARB)
        return true;
    if (target == GL_TEXTURE_3D)
        return true;
#if defined(GL_EXT_texture_rectangle)
    if (target == GL_TEXTURE_RECTANGLE_EXT)
        return true;
#elif defined(GL_NV_texture_rectangle)
        if (target == GL_TEXTURE_RECTANGLE_NV)
                return true;
#endif
    if (target == GL_TEXTURE_2D)
        return true;
    if (target == GL_TEXTURE_1D)
        return true;
    return false;
}

bool ps10_set_map(const std::vector<int>& argv)
{
    if (argv.size() % 2 != 0)
    {
        errors.set("Odd number of arguments for texture target map.");
        return false;
    }
    for (unsigned int i=0;i<argv.size();i=i+2)
    {
        int stage = argv[i];
        int target = argv[i+1];
        if (!IsLegalTarget(target))
        {
            errors.set("Illegal target in texture target map.");
            return false;
        }
        ps10::stageToTargetMap[stage] = target;
    }
    return true;
}

int const_to_combiner_reg_mapping[32][3]; // each 3 tuple is: (constant#, stage #, reg #)
int const_to_combiner_reg_mapping_count = 0;


namespace
{
    struct set_constants
    {
        void operator() (constdef c)
        {
            if(c.reg[0] != 'c' && c.reg.size() != 2)
                DBG_MESG("def line must use constant registers", 0);
            int reg = c.reg[1] - '0';
            GLenum stage = GL_COMBINER0_NV + (reg / 2);
            GLenum cclr  = GL_CONSTANT_COLOR0_NV + (reg % 2);

            GLfloat cval[4];
            cval[0] = c.r;
            cval[1] = c.g;
            cval[2] = c.b;
            cval[3] = c.a;
            glCombinerStageParameterfvNV(stage, cclr, cval);
        }
    };

    GLenum get_tex_target(int stage)
    {
        std::map<int, GLenum>::iterator iter = stageToTargetMap.find(stage);
        if (iter != stageToTargetMap.end())
            return (*iter).second;
        // If no mapping set, use the current state. This will not work correctly, in general,
        // if nvparse was invoked within a display list.
        if(glIsEnabled(GL_TEXTURE_CUBE_MAP_ARB))
            return GL_TEXTURE_CUBE_MAP_ARB;
        if(glIsEnabled(GL_TEXTURE_3D))
            return GL_TEXTURE_3D;
#if defined(GL_EXT_texture_rectangle)
        if(glIsEnabled(GL_TEXTURE_RECTANGLE_EXT))
            return GL_TEXTURE_RECTANGLE_EXT;
#elif defined(GL_NV_texture_rectangle)
                if(glIsEnabled(GL_TEXTURE_RECTANGLE_NV))
                        return GL_TEXTURE_RECTANGLE_NV;
#endif
        if(glIsEnabled(GL_TEXTURE_2D))
            return GL_TEXTURE_2D;
        if(glIsEnabled(GL_TEXTURE_1D))
            return GL_TEXTURE_1D;

        //otherwise make the op none...
        return GL_NONE;
    }

    

    struct set_texture_shaders
    {
        set_texture_shaders(vector<constdef> * cdef)
        {
            GLint activeTex = 0;
            glGetIntegerv(GL_ACTIVE_TEXTURE, &activeTex);
            for(stage = 0; stage < 4; stage++)
            {
                glActiveTextureARB(GL_TEXTURE0_ARB + stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_NONE);
            }
            stage = 0;
            c = cdef;

            glActiveTextureARB(activeTex);
        }

        void operator() (vector<string> & instr)
        {
            if(stage > 3)
                return;
            GLint activeTex = 0;
            glGetIntegerv(GL_ACTIVE_TEXTURE, &activeTex);

            glActiveTextureARB(GL_TEXTURE0_ARB + stage);

            string op = instr[0];
            if(op == "tex")
            {
                if(instr.size() != 2)
                    fprintf(stderr,"incorrect \"tex\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, get_tex_target(stage));
            }
            else if(op == "texbem")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texbem\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_OFFSET_TEXTURE_2D_NV);
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texbem\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texbeml")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texbeml\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_OFFSET_TEXTURE_SCALE_NV);
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texbeml\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texcoord")
            {
                if(instr.size() != 2)
                    fprintf(stderr,"incorrect \"texcoord\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_PASS_THROUGH_NV);
            }
            else if(op == "texkill")
            {
                if(instr.size() != 2)
                    fprintf(stderr,"incorrect \"texkill\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_CULL_FRAGMENT_NV);
            }
            else if(op == "texm3x2pad")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texm3x2pad\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DOT_PRODUCT_NV);
                if(instr[2].find("_bx2") != string::npos)
                {
                   instr[2].erase(instr[2].begin() + instr[2].find("_bx2"), instr[2].end());
                   glTexEnvi(GL_TEXTURE_SHADER_NV, GL_RGBA_UNSIGNED_DOT_PRODUCT_MAPPING_NV, GL_EXPAND_NORMAL_NV);
                }
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texm3x2pad\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texm3x2tex")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texm3x2tex\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DOT_PRODUCT_TEXTURE_2D_NV);
                if(instr[2].find("_bx2") != string::npos)
                {
                   instr[2].erase(instr[2].begin() + instr[2].find("_bx2"), instr[2].end());
                   glTexEnvi(GL_TEXTURE_SHADER_NV, GL_RGBA_UNSIGNED_DOT_PRODUCT_MAPPING_NV, GL_EXPAND_NORMAL_NV);
                }
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texm3x2tex\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texm3x3pad")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texm3x3pad\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DOT_PRODUCT_NV);
                if(instr[2].find("_bx2") != string::npos)
                {
                   instr[2].erase(instr[2].begin() + instr[2].find("_bx2"), instr[2].end());
                   glTexEnvi(GL_TEXTURE_SHADER_NV, GL_RGBA_UNSIGNED_DOT_PRODUCT_MAPPING_NV, GL_EXPAND_NORMAL_NV);
                }
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texm3x3pad\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texm3x3tex")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texm3x3tex\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;

                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DOT_PRODUCT_TEXTURE_CUBE_MAP_NV);

                if(instr[2].find("_bx2") != string::npos)
                {
                   instr[2].erase(instr[2].begin() + instr[2].find("_bx2"), instr[2].end());
                   glTexEnvi(GL_TEXTURE_SHADER_NV, GL_RGBA_UNSIGNED_DOT_PRODUCT_MAPPING_NV, GL_EXPAND_NORMAL_NV);
                }
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texm3x3tex\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texm3x3spec")
            {
                if(instr.size() != 4 || stage == 0)
                    fprintf(stderr,"incorrect \"texm3x3spec\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;

                if(! c)
                    return;
                constdef cd;
                for(int i = c->size()-1; i >= 0; i--)
                {
                    cd = (*c)[i];
                    if(cd.reg == "c0")
                        break;
                }

                if(cd.reg != "c0" || instr[3] != "c0")
                    return;
                GLfloat eye[4];
                eye[0] = cd.r;
                eye[1] = cd.g;
                eye[2] = cd.b;
                eye[3] = cd.a;

                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DOT_PRODUCT_CONST_EYE_REFLECT_CUBE_MAP_NV);
                glTexEnvfv(GL_TEXTURE_SHADER_NV, GL_CONST_EYE_NV, eye);

                if(instr[2].find("_bx2") != string::npos)
                {
                   instr[2].erase(instr[2].begin() + instr[2].find("_bx2"), instr[2].end());
                   glTexEnvi(GL_TEXTURE_SHADER_NV, GL_RGBA_UNSIGNED_DOT_PRODUCT_MAPPING_NV, GL_EXPAND_NORMAL_NV);
                }
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texm3x3tex\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texm3x3vspec")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texm3x3vspec\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;

                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DOT_PRODUCT_REFLECT_CUBE_MAP_NV);

                if(instr[2].find("_bx2") != string::npos)
                {
                   instr[2].erase(instr[2].begin() + instr[2].find("_bx2"), instr[2].end());
                   glTexEnvi(GL_TEXTURE_SHADER_NV, GL_RGBA_UNSIGNED_DOT_PRODUCT_MAPPING_NV, GL_EXPAND_NORMAL_NV);
                }
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texm3x3tex\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texreg2ar")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texreg2ar\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DEPENDENT_AR_TEXTURE_2D_NV);
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texreg2ar\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            else if(op == "texreg2gb")
            {
                if(instr.size() != 3 || stage == 0)
                    fprintf(stderr,"incorrect \"texreg2gb\" instruction, stage %d...\n", stage);
                reg2stage[instr[1]] = stage;
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_SHADER_OPERATION_NV, GL_DEPENDENT_GB_TEXTURE_2D_NV);
                if(reg2stage.count(instr[2]) == 0)
                    fprintf(stderr,"incorrect \"texreg2gb\" instruction, stage %d...\n", stage);
                glTexEnvi(GL_TEXTURE_SHADER_NV, GL_PREVIOUS_TEXTURE_INPUT_NV, GL_TEXTURE0_ARB + reg2stage[instr[2]]);
            }
            stage++;
            glActiveTextureARB(activeTex);
        }

        map<string, int> reg2stage;
        int stage;
        vector<constdef> * c;
    };
    
    GLenum reg_enum(string s, int stage)
    {
        /*if(s == "c0")
            return GL_CONSTANT_COLOR0_NV;
        else if(s == "c1")
            return GL_CONSTANT_COLOR1_NV;
        else if(s == "c2")
            return GL_CONSTANT_COLOR0_NV;
        else if(s == "c3")
            return GL_CONSTANT_COLOR1_NV;
        else if(s == "c4")
            return GL_CONSTANT_COLOR0_NV;
        else if(s == "c5")
            return GL_CONSTANT_COLOR1_NV;
        else if(s == "c6")
            return GL_CONSTANT_COLOR0_NV;
        else if(s == "c7")
            return GL_CONSTANT_COLOR1_NV;
            */
        if (s == "c0" || s == "c1" || s == "c2" || s == "c3" || 
            s == "c4" || s == "c5" || s == "c6" || s == "c7")
        {
            GLenum result;
            if (!AddToMap(s,stage,result))
                errors.set("Illegal constant usage.",line_number);
              // This is a pain, since the caller is a void and no check is made for errors. Sigh.
            return result;
        }
        else if(s == "t0")
            return GL_TEXTURE0_ARB;
        else if(s == "t1")
            return GL_TEXTURE1_ARB;
        else if(s == "t2")
            return GL_TEXTURE2_ARB;
        else if(s == "t3")
            return GL_TEXTURE3_ARB;
        else if(s == "v0")
            return GL_PRIMARY_COLOR_NV;
        else if(s == "v1")
            return GL_SECONDARY_COLOR_NV;
        else if(s == "r0")
            return GL_SPARE0_NV;
        else if(s == "r1")
            return GL_SPARE1_NV;
        else // ??
            return GL_DISCARD_NV;
    }

    struct src
    {
        src(string s, int stage, string *regname=NULL)
        {
            init(s, stage, regname);
        }


        void init(string s, int stage, string *regname=NULL)
        {
            arg = s;
            comp = GL_RGB;
            alphaComp = GL_ALPHA;
            map = GL_SIGNED_IDENTITY_NV;

            string::size_type offset;
            if(
                (offset = s.find(".a")) != string::npos ||
                (offset = s.find(".w")) != string::npos
              )
            {
                comp = GL_ALPHA;
                s.erase(offset, offset+2);
            }
            else if ((offset = s.find(".b")) != string::npos ||
                     (offset = s.find(".z")) != string::npos)
            {
                alphaComp = GL_BLUE;
                s.erase(offset,offset+2);
            }

            bool negate = false;

            if(s[0] == '1')
            {
                s.erase(0, 1);
                while(s[0] == ' ')
                    s.erase(0,1);
                if(s[0] == '-')
                    s.erase(0,1);
                while(s[0] == ' ')
                    s.erase(0,1);
                map = GL_UNSIGNED_INVERT_NV;
            }
            else if(s[0] == '-')
            {
                s.erase(0, 1);
                while(s[0] == ' ')
                    s.erase(0,1);
                negate = true;
                map = GL_UNSIGNED_INVERT_NV;
            }

            bool half_bias = false;
            bool expand = false;
            if(s.find("_bias") != string::npos)
            {
                s.erase(s.find("_bias"), 5);
                half_bias = true;
            }
            else if(s.find("_bx2") != string::npos)
            {
                s.erase(s.find("_bx2"), 4);
                expand = true;
            }
            
            if(expand)
            {
                if(negate)
                    map = GL_EXPAND_NEGATE_NV;
                else
                    map = GL_EXPAND_NORMAL_NV;
            }
            else if(half_bias)
            {
                if(negate)
                    map = GL_HALF_BIAS_NEGATE_NV;
                else
                    map = GL_HALF_BIAS_NORMAL_NV;
            }
            reg = reg_enum(s,stage);

            if (regname != NULL) 
                *regname = s; // return the bare register name

            
            //alphaComp = GL_ALPHA;
            std::set<const char*, ltstr>::iterator iter = 
                ps10::alphaBlueRegisters.find(s.c_str());
            if (iter != ps10::alphaBlueRegisters.end())
                alphaComp = GL_BLUE;

        }

        string arg;
        GLenum reg;
        GLenum map;
        GLenum comp;
        GLenum alphaComp;
    };


    struct set_register_combiners
    {
        set_register_combiners()
        {
          // combiner = 0;
          combiner = -1;
        }

        void operator() (vector<string> & instr)
        {
            string op;
            GLenum scale = GL_NONE;
            bool paired_instr = false;
            int instr_base = 0;
            if (instr[0]=="+") {
              paired_instr = true;
              instr_base = 1;
            }
            op = instr[instr_base];
            string::size_type offset;
            if((offset = op.find("_x2")) != string::npos)
            {
                scale = GL_SCALE_BY_TWO_NV;
                op.erase(op.begin()+offset, op.begin()+offset+3);
            }
            else if((offset = op.find("_x4")) != string::npos)
            {
                scale = GL_SCALE_BY_FOUR_NV;
                op.erase(op.begin()+offset, op.begin()+offset+3);
            }
            else if((offset = op.find("_d2")) != string::npos)
            {
                scale = GL_SCALE_BY_ONE_HALF_NV;
                op.erase(op.begin()+offset, op.begin()+offset+3);
            }

            if((offset = op.find("_sat")) != string::npos)
            {
                op.erase(op.begin()+offset, op.begin()+offset+4);
            }
            
            string dst = instr[1+instr_base];
            int mask = GL_RGBA;
            if(
                (offset = dst.find(".rgba")) != string::npos  ||
                (offset = dst.find(".xyzw")) != string::npos 
                )
            {
                dst.erase(offset, offset + 5);
            }
            else if(
                (offset = dst.find(".rgb")) != string::npos  ||
                (offset = dst.find(".xyz")) != string::npos 
                )
            {
                dst.erase(offset, offset + 4);
                mask = GL_RGB;
            }
            else if(
                (offset = dst.find(".a")) != string::npos  ||
                (offset = dst.find(".w")) != string::npos 
                )
            {
                dst.erase(offset, offset + 2);
                mask = GL_ALPHA;
            }

            if (!paired_instr) 
              combiner++;

            GLenum dreg = reg_enum(dst,combiner);
            GLenum C = GL_COMBINER0_NV + combiner;

            bool isAlphaBlue = false; // To keep track of whether the dst register's alpha was its blue value.

            if(op == "add" || op == "sub")
            {
                src a(instr[2+instr_base],combiner);
                src b(instr[3+instr_base],combiner);

                if(mask == GL_RGBA || mask == GL_RGB)
                {
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_A_NV, a.reg, a.map, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_C_NV, b.reg, b.map, b.comp);
                    if(op == "add")
                        glCombinerInputNV(C, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
                    else
                        glCombinerInputNV(C, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO, GL_EXPAND_NORMAL_NV, GL_RGB);
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }

                if(mask == GL_RGBA || mask == GL_ALPHA)
                {
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_A_NV, a.reg, a.map, a.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_C_NV, b.reg, b.map, b.alphaComp);
                    if(op == "add")
                        glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
                    else
                        glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_D_NV, GL_ZERO, GL_EXPAND_NORMAL_NV, GL_ALPHA);
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
            }
            else if(op == "cnd")
            {
                src a(instr[3+instr_base],combiner);
                src b(instr[4+instr_base],combiner);

                if(instr[2+instr_base] != "r0.a" && instr[2+instr_base] != "r0.w")
                {} // bad
                if(mask == GL_RGBA || mask == GL_RGB)
                {
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_A_NV, a.reg, a.map, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_C_NV, b.reg, b.map, b.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_TRUE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }

                if(mask == GL_RGBA || mask == GL_ALPHA)
                {
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_A_NV, a.reg, a.map, a.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_C_NV, b.reg, b.map, b.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_TRUE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
            }
            else if(op == "dp3")
            {
                src a(instr[2+instr_base],combiner);
                src b(instr[3+instr_base],combiner);

                if(mask == GL_RGBA || mask == GL_RGB)
                {
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_A_NV, a.reg, a.map, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_B_NV, b.reg, b.map, b.comp);
                    glCombinerOutputNV(C, GL_RGB, dreg, GL_DISCARD_NV, GL_DISCARD_NV, scale, GL_NONE,
                        GL_TRUE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    // ooh.. what to do here?
                }

                if(mask == GL_RGBA || mask == GL_ALPHA)
                {
                    // todo -- make next ref to dst.a actually ref dst.b since combiners can't write dp3 to the alpha channel
                    // Done by Ashu: Put this register in the alphaBlueRegister set. 
                    isAlphaBlue = true;
                    ps10::alphaBlueRegisters.insert(dst.c_str());
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
            }
            else if(op == "lrp")
            {
                src a(instr[2+instr_base],combiner);
                src b(instr[3+instr_base],combiner);
                src c(instr[4+instr_base],combiner);

                if(mask == GL_RGBA || mask == GL_RGB)
                {
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_A_NV, a.reg, GL_UNSIGNED_IDENTITY_NV, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_B_NV, b.reg, b.map, b.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_C_NV, a.reg, GL_UNSIGNED_INVERT_NV, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_D_NV, c.reg, c.map, c.comp);
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }

                if(mask == GL_RGBA || mask == GL_ALPHA)
                {
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_A_NV, a.reg, GL_UNSIGNED_IDENTITY_NV, a.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_B_NV, b.reg, b.map, b.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_C_NV, a.reg, GL_UNSIGNED_INVERT_NV, a.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_D_NV, c.reg, c.map, c.alphaComp);
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
            }
            else if(op == "mad")
            {
                src a(instr[2+instr_base],combiner);
                src b(instr[3+instr_base],combiner);
                src c(instr[4+instr_base],combiner);

                if(mask == GL_RGBA || mask == GL_RGB)
                {
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_A_NV, a.reg, a.map, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_B_NV, b.reg, b.map, b.comp);                   
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_D_NV, c.reg, c.map, c.comp);
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }

                if(mask == GL_RGBA || mask == GL_ALPHA)
                {
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_A_NV, a.reg, a.map, a.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_B_NV, b.reg, b.map, b.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_C_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_D_NV, c.reg, c.map, c.alphaComp);
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, dreg, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
            }
            else if(op == "mov")
            {
                src a(instr[2+instr_base],combiner);

                if(mask == GL_RGBA || mask == GL_RGB)
                {
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_A_NV, a.reg, a.map, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB);
                    glCombinerOutputNV(C, GL_RGB, dreg, GL_DISCARD_NV, GL_DISCARD_NV, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }

                if(mask == GL_RGBA || mask == GL_ALPHA)
                {
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_A_NV, a.reg, a.map, a.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA);
                    glCombinerOutputNV(C, GL_ALPHA, dreg, GL_DISCARD_NV, GL_DISCARD_NV, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
            }
            else if(op == "mul")
            {
                src a(instr[2+instr_base],combiner);
                src b(instr[3+instr_base],combiner);

                if(mask == GL_RGBA || mask == GL_RGB)
                {
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_A_NV, a.reg, a.map, a.comp);
                    glCombinerInputNV(C, GL_RGB, GL_VARIABLE_B_NV, b.reg, b.map, b.comp);
                    glCombinerOutputNV(C, GL_RGB, dreg, GL_DISCARD_NV, GL_DISCARD_NV, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }

                if(mask == GL_RGBA || mask == GL_ALPHA)
                {
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_A_NV, a.reg, a.map, a.alphaComp);
                    glCombinerInputNV(C, GL_ALPHA, GL_VARIABLE_B_NV, b.reg, b.map, b.alphaComp);
                    glCombinerOutputNV(C, GL_ALPHA, dreg, GL_DISCARD_NV, GL_DISCARD_NV, scale, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
                else if (!paired_instr)
                {
                    glCombinerOutputNV(C, GL_ALPHA, GL_DISCARD_NV, GL_DISCARD_NV, GL_DISCARD_NV, GL_NONE, GL_NONE,
                                       GL_FALSE, GL_FALSE, GL_FALSE);
                }
            }
            // combiner++;
            if (!isAlphaBlue)
                RemoveFromAlphaBlue(dst);
        }

        int combiner;
    };


}

void ps10::SetFinalCombinerStage()
{
    glFinalCombinerInputNV(GL_VARIABLE_A_NV,GL_FOG,GL_UNSIGNED_IDENTITY_NV,GL_ALPHA);
    glFinalCombinerInputNV(GL_VARIABLE_B_NV,GL_SPARE0_NV,
            GL_UNSIGNED_IDENTITY_NV,GL_RGB);
    glFinalCombinerInputNV(GL_VARIABLE_C_NV,GL_FOG,GL_UNSIGNED_IDENTITY_NV,GL_RGB);
    glFinalCombinerInputNV(GL_VARIABLE_D_NV,GL_ZERO,GL_UNSIGNED_IDENTITY_NV,GL_RGB);
    glFinalCombinerInputNV(GL_VARIABLE_E_NV,GL_ZERO,GL_UNSIGNED_IDENTITY_NV,GL_RGB);
    glFinalCombinerInputNV(GL_VARIABLE_F_NV,GL_ZERO,GL_UNSIGNED_IDENTITY_NV,GL_RGB);
    std::set<const char*, ltstr>::iterator iter = ps10::alphaBlueRegisters.find("r0");
    GLenum alphaComp = GL_ALPHA;
    if (iter != ps10::alphaBlueRegisters.end())
        alphaComp = GL_BLUE;
    glFinalCombinerInputNV(GL_VARIABLE_G_NV,GL_SPARE0_NV,GL_UNSIGNED_IDENTITY_NV,alphaComp);
    // We can now clear alphaBlueRegisters for the next go around
    alphaBlueRegisters.clear();
}

void ps10::invoke(vector<constdef> * c,
                  list<vector<string> > * a,
                  list<vector<string> > * b)
{
    const_to_combiner_reg_mapping_count = 0; // Hansong

    GLint activeTex = 0;
    glGetIntegerv(GL_ACTIVE_TEXTURE, &activeTex);

    glEnable(GL_PER_STAGE_CONSTANTS_NV); // should we require apps to do this?
    if(c)
        for_each(c->begin(), c->end(), set_constants());
    if(a)
        for_each(a->begin(), a->end(), set_texture_shaders(c));
    glActiveTextureARB( GL_TEXTURE0_ARB );
    int numCombiners = 0;
    list<vector<string> >::iterator it = b->begin();
    for(; it!=b->end(); ++it) {
      if ( (*it)[0] != "+" )
        numCombiners++;
    }
    glCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV, numCombiners);
    if(b)
        for_each(b->begin(), b->end(), set_register_combiners());
    SetFinalCombinerStage();
    // We can clear the stageToTarget map now.
    stageToTargetMap.clear();
    glActiveTextureARB(activeTex);
}

// simple identification - just look for magic substring
//  -- easy to break...
bool is_ps10(const char * s)
{
    if(strstr(s, "ps.1.0"))
        return true;
    if(strstr(s, "Ps.1.0"))
        return true;
    if(strstr(s, "ps.1.1"))
        return true;
    if(strstr(s, "Ps.1.1"))
        return true;
    return false;
}

bool ps10::init_extensions()
{
    // register combiners   
    static bool rcinit = false;
    if(rcinit == false)
    {
      /*
        if(! glh_init_extensions("GL_NV_register_combiners"))
        {
            errors.set("unable to initialize GL_NV_register_combiners\n");
            return false;
        }
        else
        {
        */
            rcinit = true;
            /*
        }
        */
    }

    // register combiners 2
    static bool rc2init = false;
    if(rc2init == false)
    {
      /*
        if( ! glh_init_extensions("GL_NV_register_combiners2"))
        {
            errors.set("unable to initialize GL_NV_register_combiners2\n");
            return false;
        }
        else
        {
        */
            rc2init = true;
            /*
        }
        */
    }
    
    static bool tsinit = 0; 
    if (tsinit == false )
    {
      /*
        if(! glh_init_extensions( "GL_NV_texture_shader " "GL_ARB_multitexture " ))
        {
            errors.set("unable to initialize GL_NV_texture_shader\n");
            return false;
        }
        else
        {
        */
            tsinit = true;
            /*
        }
        */
    }
    constToStageAndConstMap.clear();
    constToStageArray.clear();
    stageToConstMap.clear();
    line_number = 1;
    return true;
}

const int* ps10_get_info(int* pcount)
{
    if (pcount)
        *pcount = constToStageArray.size();
    return &(constToStageArray[0]);
}
