source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/ShaderProgram.cpp @ 3046

#include "ShaderProgram.h"
#include "Matrix4x4.h"
#include "Timer/PerfTimer.h"
#include "Vector3.h"
#include "Camera.h"
#include "Light.h"


using namespace std;

namespace CHCDemoEngine 
{ 

//////////
//-- changing shader parameters

static float sCurrentTimer = 0;
static Matrix4x4 sCurrentViewMatrix = IdentityMatrix();
static Vector3 sCurrentViewDir = Vector3::UNIT_Y();
static Vector3 sCurrentLightDir = Vector3::UNIT_Y();


/*********************************************************/
/*         GPUProgramParameters implementation           */
/*********************************************************/


GPUProgramParameters::GPUProgramParameters(ShaderProgram *p): 
mProgram(p), 
mTimerParam(-1),
mViewDirParam(-1),
mViewMatrixParam(-1),
mLightDirParam(-1)
{
}


GPUProgramParameters::GPUProgramParameters(): 
mProgram(NULL),
mTimerParam(-1),
mViewDirParam(-1),
mViewMatrixParam(-1),
mLightDirParam(-1)
{
}


void GPUProgramParameters::Reset()
{
        mFloats.clear();
        mTextures.clear();
        mMatrices.clear();
        mArrays.clear();

        mTimerParam = -1;
        mViewDirParam = -1;
        mLightDirParam = -1;
        mViewMatrixParam = -1;
}


void GPUProgramParameters::SetValue1f(int idx, float value)
{
        if (mFloats.size() < idx + 1)
                mFloats.resize(idx + 1);

        mFloats[idx] = FloatParam(&value, 1);
}


void GPUProgramParameters::SetValue2f(int idx, float val1, float val2)
{
        if (mFloats.size() < idx + 1)
                mFloats.resize(idx + 1);

        float vals[] = {val1, val2};

        mFloats[idx] = FloatParam(vals, 2);
}


void GPUProgramParameters::SetValue3f(int idx, float val1, float val2, float val3)
{
        if (mFloats.size() < idx + 1)
                mFloats.resize(idx + 1);

        float vals[] = {val1, val2, val3};

        mFloats[idx] = FloatParam(vals, 3);
}


void GPUProgramParameters::SetArray1f(int idx, float *vals, int numElements)
{
        if (mArrays.size() < idx + 1)
                mArrays.resize(idx + 1);

        mArrays[idx] = ArrayParam(vals, 1, numElements);
}


void GPUProgramParameters::SetArray2f(int idx, float *vals, int numElements)
{
        if (mArrays.size() < idx + 1)
                mArrays.resize(idx + 1);

        mArrays[idx] = ArrayParam(vals, 2, numElements);
}


void GPUProgramParameters::SetArray3f(int idx, float *vals, int numElements)
{
        if (mArrays.size() < idx + 1)
                mArrays.resize(idx + 1);

        mArrays[idx] = ArrayParam(vals, 3, numElements);
}


void GPUProgramParameters::SetTexture(int idx, unsigned int tex)
{
        if (mTextures.size() < idx + 1)
                mTextures.resize(idx + 1);

        mTextures[idx] = IntParam(tex);
}


void GPUProgramParameters::SetMatrix(int idx, Matrix4x4 *mat)
{
        if (mMatrices.size() < idx + 1)
                mMatrices.resize(idx + 1);

        mMatrices[idx] = MatrixParam(mat);
}


void GPUProgramParameters::SetTimerParam(int idx)
{
        mTimerParam = idx;
}


void GPUProgramParameters::SetViewMatrixParam(int idx)
{
        mViewMatrixParam = idx;
}


void GPUProgramParameters::SetViewDirParam(int idx)
{
        mViewDirParam = idx;
}


void GPUProgramParameters::SetLightDirParam(int idx)
{
        mLightDirParam = idx;
}


void GPUProgramParameters::SetValue1f(const string &name, float val)
{
        SetValue1f(mProgram->GetParamIdxByName(name), val);
}


void GPUProgramParameters::SetValue2f(const string &name, float val1, float val2)
{
        SetValue2f(mProgram->GetParamIdxByName(name), val1, val2);
}


void GPUProgramParameters::SetValue3f(const string &name, float val1, float val2, float val3)
{
        SetValue3f(mProgram->GetParamIdxByName(name), val1, val2, val3);
}


void GPUProgramParameters::SetArray1f(const string &name, float *vals, int numElements)
{
        SetArray1f(mProgram->GetParamIdxByName(name), vals, numElements);
}


void GPUProgramParameters::SetArray2f(const string &name, float *vals, int numElements)
{
        SetArray2f(mProgram->GetParamIdxByName(name), vals, numElements);
}


void GPUProgramParameters::SetArray3f(const string &name, float *vals, int numElements)
{
        SetArray3f(mProgram->GetParamIdxByName(name), vals, numElements);
}


void GPUProgramParameters::SetMatrix(const string &name, Matrix4x4 *mat)
{
        SetMatrix(mProgram->GetParamIdxByName(name), mat);
}


void GPUProgramParameters::SetTexture(const string &name, unsigned int tex)
{
        SetTexture(mProgram->GetParamIdxByName(name), tex);
}


void GPUProgramParameters::UpdateParameters()
{
        if (!mProgram) return;

        for (int i = 0; i < (int)mFloats.size(); ++ i)
        {
                const FloatParam &p = mFloats[i];

                if (!p.mValid) continue;

                switch (p.mNumComponents)
                {
                case 1:
                        mProgram->SetValue1f(i, p.mValues[0]);
                        break;
                case 2:
                        mProgram->SetValue2f(i, p.mValues[0], p.mValues[1]);
                        break;
                case 3:
                        mProgram->SetValue3f(i, p.mValues[0], p.mValues[1], p.mValues[2]);
                        break;
                default:
                        mProgram->SetValue1f(i, p.mValues[0]);
                }
        }

        for (int i = 0; i < (int)mTextures.size(); ++ i)
        {
                const IntParam &p = mTextures[i];

                if (p.mValid)
                        mProgram->SetTexture(i, p.mValue);
        }

        for (int i = 0; i < (int)mMatrices.size(); ++ i)
        {
                const MatrixParam &p = mMatrices[i];

                if (p.mValid)
                        mProgram->SetMatrix(i, *p.mValue);
        }
        
        for (int i = 0; i < (int)mArrays.size(); ++ i)
        {
                const ArrayParam &p = mArrays[i];

                if (!p.mValid) continue;

                switch (p.mNumComponents)
                {
                case 1:
                        mProgram->SetArray1f(i, p.mValues, p.mNumEntries);
                        break;
                case 2:
                        mProgram->SetArray2f(i, p.mValues, p.mNumEntries);
                        break;
                case 3:
                        mProgram->SetArray3f(i, p.mValues, p.mNumEntries);
                        break;
                default:
                        mProgram->SetArray1f(i, p.mValues, p.mNumEntries);
                }
        }

        if (mTimerParam >= 0)
                mProgram->SetValue1f(mTimerParam, sCurrentTimer);

        if (mViewDirParam >= 0)
                mProgram->SetValue3f(mViewDirParam, sCurrentViewDir.x, sCurrentViewDir.y, sCurrentViewDir.z);
        if (mLightDirParam >= 0)
                mProgram->SetValue3f(mLightDirParam, sCurrentLightDir.x, sCurrentLightDir.y, sCurrentLightDir.z);
        if (mViewMatrixParam >= 0)
                mProgram->SetMatrix(mViewMatrixParam, sCurrentViewMatrix);
}


void GPUProgramParameters::InitFrame(Camera *cam, DirectionalLight *light)
{
        static PerfTimer mytimer;
        sCurrentTimer = mytimer.Elapsedms(false) * M_PI / 180.0f;

        cam->GetModelViewMatrix(sCurrentViewMatrix);
        sCurrentViewDir = cam->GetDirection();

        Matrix4x4 vo;
        // transform to view space
        cam->GetViewOrientationMatrix(vo);
        //sCurrentLightDir = /*vo **/ -light->GetDirection();
        sCurrentLightDir = vo * -light->GetDirection();
}



/********************************************************/
/*             ShaderProgram implementation             */
/********************************************************/


ShaderProgram::ShaderProgram(CGcontext context, 
                                                         const std::string &filename, 
                                                         CGprofile profile,
                                                         const std::string &functionName)
{
        mProgram = cgCreateProgramFromFile(context, 
                                               CG_SOURCE,
                                                                           filename.c_str(), 
                                                                           profile,
                                                                           functionName.c_str(),
                                                                           NULL);

        if (mProgram) cgGLLoadProgram(mProgram);

        const int maxParams = 64;
        mParameters.resize(maxParams);

        for (int i = 0; i < maxParams; ++ i)
        {
                mParameters[i] = NULL;
        }
}


void ShaderProgram::Bind()
{
        cgGLBindProgram(mProgram);

        // enable all texture parameters
        CGParameterArray::const_iterator it, it_end = mTextureParams.end();

        for (it = mTextureParams.begin(); it != it_end; ++ it) 
                cgGLEnableTextureParameter(*it);
}


void ShaderProgram::Release()
{
        CGParameterArray::const_iterator it, it_end = mTextureParams.end();

        // disable all texture parameters
        for (it = mTextureParams.begin(); it != it_end; ++ it)
                cgGLDisableTextureParameter(*it);
}


CGparameter ShaderProgram::AddParameter(const string &name, int idx)
{
        CGparameter p = GetOrCreateParameter(name);

        mParamHash[name] = idx;
        mParameters[idx] = p;

        return p;
}


CGparameter ShaderProgram::GetOrCreateParameter(const string &name)
{
        CGparameter p;
        CGParameterMap::const_iterator it = mParamHash.find(name);

        if (it == mParamHash.end())
        {
                p = cgGetNamedParameter(mProgram, name.c_str());
        }
        else
        {
                p = mParameters[(*it).second];
        }

        //cout << "name: " << name << " " << p << " " << mProgram << endl;
        return p;
}


CGparameter ShaderProgram::GetParameter(int idx) const
{
        return mParameters[idx];
}


void ShaderProgram::SetValue1f(int idx, float val)
{
        cgGLSetParameter1f(GetParameter(idx), val);
}


void ShaderProgram::SetValue2f(int idx, float val1, float val2)
{
        cgGLSetParameter2f(GetParameter(idx), val1, val2);
}


void ShaderProgram::SetValue3f(int idx, float val1, float val2, float val3)
{
        cgGLSetParameter3f(GetParameter(idx), val1, val2, val3);
}


void ShaderProgram::SetArray1f(int idx, float *vals, int numElements)
{
        cgGLSetParameterArray1f(GetParameter(idx), 0, numElements, (const float *)vals);
}


void ShaderProgram::SetArray2f(int idx, float *vals, int numElements)
{
        cgGLSetParameterArray2f(GetParameter(idx), 0, numElements, (const float *)vals);
}


void ShaderProgram::SetArray3f(int idx, float *vals, int numElements)
{
        cgGLSetParameterArray3f(GetParameter(idx), 0, numElements, (const float *)vals);
}


void ShaderProgram::SetMatrix(int idx, const Matrix4x4 &mat)
{
        cgGLSetMatrixParameterfc(GetParameter(idx), (const float *)mat.x);
}


void ShaderProgram::SetTexture(int idx, unsigned int tex)
{
        CGparameter p = GetParameter(idx);

        cgGLSetTextureParameter(p, tex);
        cgGLEnableTextureParameter(p);
}


void ShaderProgram::SetValue1f(const string &name, float val)
{
        cgGLSetParameter1f(GetOrCreateParameter(name), val);
}


void ShaderProgram::SetValue2f(const string &name, float val1, float val2)
{
        cgGLSetParameter2f(GetOrCreateParameter(name), val1, val2);
}


void ShaderProgram::SetValue3f(const string &name, float val1, float val2, float val3)
{
        cgGLSetParameter3f(GetOrCreateParameter(name), val1, val2, val3);
}


void ShaderProgram::SetArray1f(const string &name, float *vals, int numElements)
{
        cgGLSetParameterArray1f(GetOrCreateParameter(name), 0, numElements, (const float *)vals);
}


void ShaderProgram::SetArray2f(const string &name, float *vals, int numElements)
{
        cgGLSetParameterArray2f(GetOrCreateParameter(name), 0, numElements, (const float *)vals);
}


void ShaderProgram::SetArray3f(const string &name, float *vals, int numElements)
{
        cgGLSetParameterArray3f(GetOrCreateParameter(name), 0, numElements, (const float *)vals);
}


void ShaderProgram::SetMatrix(const string &name, const Matrix4x4 &mat)
{
        cgGLSetMatrixParameterfc(GetOrCreateParameter(name), (const float *)mat.x);
}


void ShaderProgram::SetTexture(const string &name, unsigned int tex)
{
        CGparameter p = GetOrCreateParameter(name);

        cgGLSetTextureParameter(p, tex);
        cgGLEnableTextureParameter(p);

        mTextureParams.push_back(p);
}


int ShaderProgram::GetParamIdxByName(const std::string &name) const
{
        CGParameterMap::const_iterator it = mParamHash.find(name);
        return (*it).second;
}


} // namespace