Re: [Scgraph-users] compiling in Linux

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Hi Jaime,

Jaime Villarreal wrote:
> Hi there,
> 
> I'm really excited about trying out scgraph but I'm having trouble 
> getting started. I'm running Ubuntu Hardy 8.04. I've installed all the 
> dependencies from the ubuntu respositories and supercollider packages 
> from the http://ppa.launchpad.net/artfwo/ubuntu respository. 
> Supercollider running fine with jack. I followed the instructions in the 
> scgraph INSTALL file, compiled and installed scgraph, edited sclang.cfg 
> and made the extra directories.
> 
> When I run scgraph in the terminal I get the following output.
> 
> "scgraph
> ScGraph - (C) 2006, 2007, 2008
> [Run scgraph -h for help]
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefinePlugInCmd not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported
> [Warning]: fDefineBufGen not supported"
> 

This looks perfectly fine.. (since noone implemented buffer support yet, 
this warning is perfectly justified)

> Now I'm a little confused here as to whether or not I need to leave 
> scgraph running in a terminal before I open gedit with the sced plugin 
> to evaluate sc3 code. 

Hmm, well yeah. You do need to have scgraph running to use it. You could 
also start it from within gedit using the String.unixCmd method.

> I went ahead and did that but when I try to 
> evaluate the code that came with the help docs:
> 
> "(
> g = Server(\graphics, NetAddr("localhost", 37291));
> g.boot;
> )"
> 
> The scgraph running in a seperate terminal spits out the following:
> 
> "[OscHandler]: Error while calling g_new (): [NodeTree]: Warning: Node 
> ID already exists!"

This is fine. ScGraph creates this node per default. It really only is a 
warning..

> I ignored that and tried to evaluate the next piece of code.
> 
> "(
> SynthDef (\WobblingCube, {
> var source;
> source = GCube.gr(size: SinOsc.kr(freq: 0.5));
> GGLRenderer.gr(source);
> }).play(target: g);
> )"
> 
> but scgraph spits out the following and crashes
> 
> "[GGLRenderer]: Warning: shader objects extension missing
> Segmentation fault"

Well, it seems your 3D hardware [or driver] is missing support for the 
shader objects extension. I suppose the plugins/gl_renderer.h and 
plugins/gl_renderer.cc need to be updated for this (basically just some 
#ifdefs around some functions and lines). See below..

> Is it possible that scgraph was not compiled correctly? I noticed a lot 
> of warnings regarding the QT libraries in the make output. Could that be 
> the problem? Here is my makefile output:
> http://libreyabierto.cc/files/scgraph_make_output.txt

The build looks totally fine.  I guess you are referring to these messages:

--- Creating MOC output: culling.h => culling_moc.cc
/usr/share/qt4/bin/moc  -o culling_moc.cc culling.h
culling.h:0: Warning: No relevant classes found. No output generated.

--- Building plugin: culling.cc => culling.so
g++ -I../glew/ -I../oscpack/ -DGLEW_MX  -shared -fpic 
-L/usr/share/qt4/lib -lQtGui -lQtCore -lQtOpenGL -lQtUiTools 
-export-dynamic -rdynamic -ldl  -o culling.so culling.cc culling_moc.cc 
-I/usr/share/qt4/include -DQT_THREAD_SUPPORT -L/usr/share/qt4/lib 
-lQtGui -lQtCore -lQtOpenGL -lQtUiTools   -pthread

--- Creating MOC output: transformation.h => transformation_moc.cc
/usr/share/qt4/bin/moc  -o transformation_moc.cc transformation.h
transformation.h:0: Warning: No relevant classes found. No output generated.

--- Building plugin: transformation.cc => transformation.so
g++ -I../glew/ -I../oscpack/ -DGLEW_MX  -shared -fpic 
-L/usr/share/qt4/lib -lQtGui -lQtCore -lQtOpenGL -lQtUiTools 
-export-dynamic -rdynamic -ldl  -o transformation.so transformation.cc 
transformation_moc.cc -I/usr/share/qt4/include -DQT_THREAD_SUPPORT 
-L/usr/share/qt4/lib -lQtGui -lQtCore -lQtOpenGL -lQtUiTools   -pthread


The "Warning: No relevant classes found. No output generated." is just a 
warning and perfectly fine..

About the shader problem: Does this diff help (also attached)? Make 
sure, you do not have HAVE_SHADERS set to 1 in Makefile.include:

Index: server/osc_handler.cc
===================================================================
--- server/osc_handler.cc	(revision 35)
+++ server/osc_handler.cc	(working copy)
@@ -915,11 +915,11 @@
  				}

  				// read number of values from stream	
-				(*(arg++)).AsInt32 ();
+				int num_vals = (*(arg++)).AsInt32 ();
  				//std::cout << control_name << std::endl;
  	
  				//std::cout << (*arg).TypeTag () << std::endl;
-				while (arg != message->ArgumentsEnd ())
+				for (int i = 0;arg != message->ArgumentsEnd () &&  i < num_vals; ++i)
  				{
  					float control_value;
  	
Index: server/Makefile
===================================================================
--- server/Makefile	(revision 35)
+++ server/Makefile	(working copy)
@@ -50,7 +50,7 @@

  -include ../Makefile.include

-export PREFIX INSTALL CP MV RM QT_COMPILE_FLAGS QT_LINK_FLAGS MOC 
SC3_HEADERS ADDITIONAL_COMPILE_FLAGS ADDITIONAL_LINK_FLAGS HAVE_JACK TARGET
+export PREFIX INSTALL CP MV RM QT_COMPILE_FLAGS QT_LINK_FLAGS MOC 
SC3_HEADERS ADDITIONAL_COMPILE_FLAGS ADDITIONAL_LINK_FLAGS HAVE_JACK 
TARGET HAVE_SHADERS


  .PHONY: all
Index: server/plugins/Makefile
===================================================================
--- server/plugins/Makefile	(revision 35)
+++ server/plugins/Makefile	(working copy)
@@ -34,6 +34,11 @@
    PLUGINS += freq_amp
  endif

+ifeq ($(HAVE_SHADERS),1)
+  ADDITIONAL_COMPILE_FLAGS += -DHAVE_SHADERS
+endif
+
+
  PLUGIN_DIRS =

  TARGET_DIR = $(PREFIX)/lib/scgraph/plugins
Index: server/plugins/gl_renderer.cc
===================================================================
--- server/plugins/gl_renderer.cc	(revision 35)
+++ server/plugins/gl_renderer.cc	(working copy)
@@ -72,6 +72,7 @@
  		/* Problem: glewInit failed, something is seriously wrong. */
  		fprintf(stderr, "Error: %s\n", glewGetErrorString(err));
  	}
+#ifdef HAVE_SHADERS
  	if (!GLEW_ARB_vertex_program)
  	{
  		std::cout << "[GGLRenderer]: Warning: vertex program extension 
missing" << std::endl;
@@ -86,10 +87,12 @@
  	{
  		std::cout << "[GGLRenderer]: Warning: shader objects extension 
missing" << std::endl;
  	}
-
+#endif
  	_renderer->change_textures();

+#ifdef HAVE_SHADERS
  	_renderer->change_shader_programs();
+#endif
  	//_shader_program = glCreateProgramObjectARB();
  }

@@ -231,6 +234,7 @@


  void GLRenderer::compile_and_link_shader_program(unsigned int index, 
ShaderPool::ShaderProgram *s) {
+#ifdef HAVE_SHADERS
  	std::cout << "[GGLRenderer]: Compiling and linking shader program: " 
<< index << std::endl;
  	_gl_widget->makeCurrent();

@@ -300,26 +304,31 @@
  	std::cout << "[GGLRenderer]: Shader log:" << std::endl << log << 
std::endl << "[GGLRenderer]: Shader log end." << std::endl;

  	glUseProgramObjectARB(0);
+#endif
  }

  void GLRenderer::clear_shader_program(unsigned int index) {
+#ifdef HAVE_SHADERS
  	for (size_t j = 0; j < _shader_programs[index].second.size(); ++j)
  		glDeleteObjectARB(_shader_programs[index].second[j]);

  	glDeleteObjectARB(_shader_programs[index].first);
-
+#endif
  }

  void GLRenderer::setup_shader_programs() {
+#ifdef HAVE_SHADERS
  	ShaderPool *p = ShaderPool::get_instance();

  	for (ShaderPool::shader_programs_map_t::iterator it = 
p->_shader_programs.begin(); it != p->_shader_programs.end(); ++it)
  	{
  		compile_and_link_shader_program(it->first, it->second.get());
  	}
+#endif
  }

  void GLRenderer::clear_shader_programs() {
+#ifdef HAVE_SHADERS
  	_gl_widget->makeCurrent();

  	for (shader_programs_map_t::iterator it = _shader_programs.begin(); 
it != _shader_programs.end(); ++it)
@@ -328,11 +337,14 @@
  	}

  	_shader_programs.clear();
+#endif
  }

  void GLRenderer::change_shader_programs () {
+#ifdef HAVE_SHADERS
  	clear_shader_programs();
  	setup_shader_programs();
+#endif
  }

  void GLRenderer::add_shader_program (unsigned int index) {
@@ -662,6 +674,7 @@

  void GLRenderer::visitShaderProgramConst (const ShaderProgram *s)
  {
+#ifdef HAVE_SHADERS
  	if (s->_on)
  	{
  		glUseProgramObjectARB(_shader_programs[s->_index].first);
@@ -672,10 +685,12 @@
  		glUseProgramObjectARB(0);
  		_current_shader_program = 0;
  	}
+#endif
  }

  void GLRenderer::visitShaderUniformConst (const ShaderUniform *s)
  {
+#ifdef HAVE_SHADERS
  	_gl_widget->makeCurrent();

  	//std::cout << "current shader program index: " << 
_current_shader_program << " uniform index: " << s->_uniform_index << 
std::endl;
@@ -722,6 +737,7 @@
  	}
  	// lookup attribute
  	//GLint attribute = 
glGetAttribLocation(_shader_program[s->_index]first, 
_shader_programs[s->_index].second->_attributes
+#endif
  }

  void GLRenderer::visitGeometryConst (const Geometry *g)


Regards,
Flo
