Hi,
I'm currently working on a Soft Shadows plug-in for MotionBuilder.
I started from the .cg examples provided in the sdk and switch them to use .cgfx files.
My cgfx shader rendering is okay, but I'm unable to restore OpenGl rendering states after.
Render with Simple.cg
Render with Simple.cgfx
How save and restore the rendering state in order to leave my CgfxDraw() cleanly ? i.e without perturbate other rendering
Shader loading(.cg and .cgfx)
if( mContext )
{
FBProgress Progress;
Progress.Caption = "Loading Cg Shader...";
// We need the full path to our Cg file.
FBSystem lSystem;
FBString lCgFile( lSystem.ApplicationPath );
lCgFile += "\\..\\..\\OpenRealitySDK\\Samples\\shadersVersionnes\\cgshaderSpecular\\Specular.cg";
//Load simple.cg program
mProgram = cgCreateProgramFromFile(mContext, CG_SOURCE, (char*)lCgFile, mProfile, NULL, NULL);
if( mProgram ) cgGLLoadProgram(mProgram);
else
{
ShowError();
return false;
}
//Get program parameters
mParamLight = cgGetNamedParameter(mProgram, "LightVec");
mParamMaterialSpecularColor = cgGetNamedParameter(mProgram, "SpecularMaterial");
mParamModelViewProj = cgGetNamedParameter(mProgram, "ModelViewProj");
mParamModelViewIT = cgGetNamedParameter(mProgram, "ModelViewIT");
if( !mParamLight || !mParamModelViewProj || !mParamModelViewIT || !mParamMaterialSpecularColor)
{
ShowError("Unable to retrieve vertex program parameters.");
return false;
}
//Cgfx part
FBString lCgFxFile(lSystem.ApplicationPath);
lCgFxFile += "\\..\\..\\OpenRealitySDK\\Samples\\shadersVersionnes\\ProjectFXComposer\\Simple.cgfx";
mCgEffect = cgCreateEffectFromFile(mContext, (char*)lCgFxFile, NULL);
CheckForCgError("creating Simple.cgfx effect");
//Get the first available technique
mCgTechnique = cgGetFirstTechnique(mCgEffect);
//Get the different parameters
mParamLightCGFX = cgGetNamedEffectParameter(mCgEffect, "LightVec");
mParamMaterialSpecularColorCGFX = cgGetNamedEffectParameter(mCgEffect, "SpecularMaterial");
mParamModelViewProjCGFX = cgGetNamedEffectParameter(mCgEffect, "ModelViewProj");
mParamModelViewITCGFX = cgGetNamedEffectParameter(mCgEffect, "ModelViewIT");
}
CgDraw() (provided as SDK example, ok)
if( pShaderModelInfo != NULL )
{
cgGLBindProgram(mProgram); //Bind program. (You can bind only one vertex and one fragment program at a time)
cgGLEnableProfile(mProfile);
// Read & set from animatable parameter
FBColor lColor1 = mColor1;
cgGLSetParameter3f(mParamMaterialSpecularColor,lColor1[0],lColor1[1],lColor1[2]);
cgGLSetParameter4f(mParamLight, 0.0, 0.0, 1.0, 1.0);
cgGLSetStateMatrixParameter(mParamModelViewProj, CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
cgGLSetStateMatrixParameter(mParamModelViewIT, CG_GL_MODELVIEW_MATRIX, CG_GL_MATRIX_INVERSE_TRANSPOSE);
glEnable(GL_LIGHTING);
DrawGeometry(pShaderModelInfo);
glDisable(GL_LIGHTING);
cgGLDisableProfile(mProfile);
}
CgFxDraw() (Mine, problematic)
if( pShaderModelInfo != NULL )
{
CGpass myCGpass;
// Read & set from animatable parameter
FBColor lColor1 = mColor1;
cgGLSetParameter3f(mParamMaterialSpecularColorCGFX,lColor1[0],lColor1[1],lColor1[2]);
cgGLSetParameter4f(mParamLightCGFX, 0.0, 0.0, 1.0, 1.0);
cgGLSetStateMatrixParameter(mParamModelViewProjCGFX, CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
cgGLSetStateMatrixParameter(mParamModelViewITCGFX, CG_GL_MODELVIEW_MATRIX, CG_GL_MATRIX_INVERSE_TRANSPOSE);
//If several pass are needed
myCGpass = cgGetFirstPass(mCgTechnique);
while (myCGpass) {
cgSetPassState(myCGpass);
DrawGeometry(pShaderModelInfo);
cgResetPassState(myCGpass);
myCGpass =cgGetNextPass(myCGpass);
}
}
Thanks
[Edited by - GuillaumeLe on July 13, 2008 12:05:20 PM]
