src/guiFormSpecMenu.h

/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2013 Kahrl <kahrl@gmx.net>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <fstream>
#include <iterator>
#include "shader.h"
#include "irrlichttypes_extrabloated.h"
#include "debug.h"
#include "filesys.h"
#include "util/container.h"
#include "util/thread.h"
#include "settings.h"
#include <ICameraSceneNode.h>
#include <IGPUProgrammingServices.h>
#include <IMaterialRenderer.h>
#include <IMaterialRendererServices.h>
#include <IShaderConstantSetCallBack.h>
#include "EShaderTypes.h"
#include "log.h"
#include "gamedef.h"
#include "client/tile.h"

/*
	A cache from shader name to shader path
*/
MutexedMap<std::string, std::string> g_shadername_to_path_cache;

/*
	Gets the path to a shader by first checking if the file
	  name_of_shader/filename
	exists in shader_path and if not, using the data path.

	If not found, returns "".

	Utilizes a thread-safe cache.
*/
std::string getShaderPath(const std::string &name_of_shader,
		const std::string &filename)
{
	std::string combined = name_of_shader + DIR_DELIM + filename;
	std::string fullpath = "";
	/*
		Check from cache
	*/
	bool incache = g_shadername_to_path_cache.get(combined, &fullpath);
	if(incache)
		return fullpath;

	/*
		Check from shader_path
	*/
	std::string shader_path = g_settings->get("shader_path");
	if(shader_path != "")
	{
		std::string testpath = shader_path + DIR_DELIM + combined;
		if(fs::PathExists(testpath))
			fullpath = testpath;
	}

	/*
		Check from default data directory
	*/
	if(fullpath == "")
	{
		std::string rel_path = std::string("client") + DIR_DELIM
				+ "shaders" + DIR_DELIM
				+ name_of_shader + DIR_DELIM
				+ filename;
		std::string testpath = porting::path_share + DIR_DELIM + rel_path;
		if(fs::PathExists(testpath))
			fullpath = testpath;
	}

	// Add to cache (also an empty result is cached)
	g_shadername_to_path_cache.set(combined, fullpath);

	// Finally return it
	return fullpath;
}

/*
	SourceShaderCache: A cache used for storing source shaders.
*/

class SourceShaderCache
{
public:
	void insert(const std::string &name_of_shader, const std::string &filename,
		const std::string &program, bool prefer_local)
	{
		std::string combined = name_of_shader + DIR_DELIM + filename;
		// Try to use local shader instead if asked to
		if(prefer_local){
			std::string path = getShaderPath(name_of_shader, filename);
			if(path != ""){
				std::string p = readFile(path);
				if(p != ""){
					m_programs[combined] = p;
					return;
				}
			}
		}
		m_programs[combined] = program;
	}

	std::string get(const std::string &name_of_shader,
		const std::string &filename)
	{
		std::string combined = name_of_shader + DIR_DELIM + filename;
		StringMap::iterator n = m_programs.find(combined);
		if (n != m_programs.end())
			return n->second;
		return "";
	}

	// Primarily fetches from cache, secondarily tries to read from filesystem
	std::string getOrLoad(const std::string &name_of_shader,
		const std::string &filename)
	{
		std::string combined = name_of_shader + DIR_DELIM + filename;
		StringMap::iterator n = m_programs.find(combined);
		if (n != m_programs.end())
			return n->second;
		std::string path = getShaderPath(name_of_shader, filename);
		if (path == "") {
			infostream << "SourceShaderCache::getOrLoad(): No path found for \""
				<< combined << "\"" << std::endl;
			return "";
		}
		infostream << "SourceShaderCache::getOrLoad(): Loading path \""
			<< path << "\"" << std::endl;
		std::string p = readFile(path);
		if (p != "") {
			m_programs[combined] = p;
			return p;
		}
		return "";
	}
private:
	StringMap m_programs;

	std::string readFile(const std::string &path)
	{
		std::ifstream is(path.c_str(), std::ios::binary);
		if(!is.is_open())
			return "";
		std::ostringstream tmp_os;
		tmp_os << is.rdbuf();
		return tmp_os.str();
	}
};


/*
	ShaderCallback: Sets constants that can be used in shaders
*/

class ShaderCallback : public video::IShaderConstantSetCallBack
{
	std::vector<IShaderConstantSetter*> m_setters;

public:
	ShaderCallback(const std::vector<IShaderConstantSetterFactory*> &factories)
	{
		for (u32 i = 0; i < factories.size(); ++i)
			m_setters.push_back(factories[i]->create());
	}

	~ShaderCallback()
	{
		for (u32 i = 0; i < m_setters.size(); ++i)
			delete m_setters[i];
	}

	virtual void OnSetConstants(video::IMaterialRendererServices *services, s32 userData)
	{
		video::IVideoDriver *driver = services->getVideoDriver();
		sanity_check(driver != NULL);

		bool is_highlevel = userData;

		for (u32 i = 0; i < m_setters.size(); ++i)
			m_setters[i]->onSetConstants(services, is_highlevel);
	}
};


/*
	MainShaderConstantSetter: Set basic constants required for almost everything
*/

class MainShaderConstantSetter : public IShaderConstantSetter
{
	CachedVertexShaderSetting<float, 16> m_world_view_proj;
	CachedVertexShaderSetting<float, 16> m_world;

public:
	MainShaderConstantSetter() :
		m_world_view_proj("mWorldViewProj"),
		m_world("mWorld")
	{}
	~MainShaderConstantSetter() {}

	virtual void onSetConstants(video::IMaterialRendererServices *services,
			bool is_highlevel)
	{
		video::IVideoDriver *driver = services->getVideoDriver();
		sanity_check(driver);

		// Set clip matrix
		core::matrix4 worldViewProj;
		worldViewProj = driver->getTransform(video::ETS_PROJECTION);
		worldViewProj *= driver->getTransform(video::ETS_VIEW);
		worldViewProj *= driver->getTransform(video::ETS_WORLD);
		if (is_highlevel)
			m_world_view_proj.set(*reinterpret_cast<float(*)[16]>(worldViewProj.pointer()), services);
		else
			services->setVertexShaderConstant(worldViewProj.pointer(), 0, 4);

		// Set world matrix
		core::matrix4 world = driver->getTransform(video::ETS_WORLD);
		if (is_highlevel)
			m_world.set(*reinterpret_cast<float(*)[16]>(world.pointer()), services);
		else
			services->setVertexShaderConstant(world.pointer(), 4, 4);

	}
};


class MainShaderConstantSetterFactory : public IShaderConstantSetterFactory
{
public:
	virtual IShaderConstantSetter* create()
		{ return new MainShaderConstantSetter(); }
};


/*
	ShaderSource
*/

class ShaderSource : public IWritableShaderSource
{
public:
	ShaderSource(IrrlichtDevice *device);
	~ShaderSource();

	/*
		- If shader material specified by name is found from cache,
		  return the cached id.
		- Otherwise generate the shader material, add to cache and return id.

		The id 0 points to a null shader. Its material is EMT_SOLID.
	*/
	u32 getShaderIdDirect(const std::string &name,
		const u8 material_type, const u8 drawtype);

	/*
		If shader specified by the name pointed by the id doesn't
		exist, create it, then return id.

		Can be called from any thread. If called from some other thread
		and not found in cache, the call is queued to the main thread
		for processing.
	*/

	u32 getShader(const std::string &name,
		const u8 material_type, const u8 drawtype);

	ShaderInfo getShaderInfo(u32 id);

	// Processes queued shader requests from other threads.
	// Shall be called from the main thread.
	void processQueue();

	// Insert a shader program into the cache without touching the
	// filesystem. Shall be called from the main thread.
	void insertSourceShader(const std::string &name_of_shader,
		const std::string &filename, const std::string &program);

	// Rebuild shaders from the current set of source shaders
	// Shall be called from the main thread.
	void rebuildShaders();

	void addShaderConstantSetterFactory(IShaderConstantSetterFactory *setter)
	{
		m_setter_factories.push_back(setter);
	}

private:

	// The id of the thread that is allowed to use irrlicht directly
	threadid_t m_main_thread;
	// The irrlicht device
	IrrlichtDevice *m_device;

	// Cache of source shaders
	// This should be only accessed from the main thread
	SourceShaderCache m_sourcecache;

	// A shader id is index in this array.
	// The first position contains a dummy shader.
	std::vector<ShaderInfo> m_shaderinfo_cache;
	// The former container is behind this mutex
	Mutex m_shaderinfo_cache_mutex;

	// Queued shader fetches (to be processed by the main thread)
	RequestQueue<std::string, u32, u8, u8> m_get_shader_queue;

	// Global constant setter factories
	std::vector<IShaderConstantSetterFactory *> m_setter_factories;

	// Shader callbacks
	std::vector<ShaderCallback *> m_callbacks;
};

IWritableShaderSource* createShaderSource(IrrlichtDevice *device)
{
	return new ShaderSource(device);
}

/*
	Generate shader given the shader name.
*/
ShaderInfo generate_shader(std::string name,
		u8 material_type, u8 drawtype,
		IrrlichtDevice *device, std::vector<ShaderCallback *> &callbacks,
		const std::vector<IShaderConstantSetterFactory*> &setter_factories,
		SourceShaderCache *sourcecache);

/*
	Load shader programs
*/
void load_shaders(std::string name, SourceShaderCache *sourcecache,
		video::E_DRIVER_TYPE drivertype, bool enable_shaders,
		std::string &vertex_program, std::string &pixel_program,
		std::string &geometry_program, bool &is_highlevel);

ShaderSource::ShaderSource(IrrlichtDevice *device):
		m_device(device)
{
	assert(m_device); // Pre-condition

	m_main_thread = thr_get_current_thread_id();

	// Add a dummy ShaderInfo as the first index, named ""
	m_shaderinfo_cache.push_back(ShaderInfo());

	// Add main global constant setter
	addShaderConstantSetterFactory(new MainShaderConstantSetterFactory());
}

ShaderSource::~ShaderSource()
{
	for (std::vector<ShaderCallback *>::iterator iter = m_callbacks.begin();
			iter != m_callbacks.end(); ++iter) {
		delete *iter;
	}
	for (std::vector<IShaderConstantSetterFactory *>::iterator iter = m_setter_factories.begin();
			iter != m_setter_factories.end(); ++iter) {
		delete *iter;
	}
}

u32 ShaderSource::getShader(const std::string &name,
		const u8 material_type, const u8 drawtype)
{
	/*
		Get shader
	*/

	if (thr_is_current_thread(m_main_thread)) {
		return getShaderIdDirect(name, material_type, drawtype);
	} else {
		/*errorstream<<"getShader(): Queued: name=\""<<name<<"\""<<std::endl;*/

		// We're gonna ask the result to be put into here

		static ResultQueue<std::string, u32, u8, u8> result_queue;

		// Throw a request in
		m_get_shader_queue.add(name, 0, 0, &result_queue);

		/* infostream<<"Waiting for shader from main thread, name=\""
				<<name<<"\""<<std::endl;*/

		while(true) {
			GetResult<std::string, u32, u8, u8>
				result = result_queue.pop_frontNoEx();

			if (result.key == name) {
				return result.item;
			}
			else {
				errorstream << "Got shader with invalid name: " << result.key << std::endl;
			}
		}

	}

	infostream<<"getShader(): Failed"<<std::endl;

	return 0;
}

/*
	This method generates all the shaders
*/
u32 ShaderSource::getShaderIdDirect(const std::string &name,
		const u8 material_type, const u8 drawtype)
{
	//infostream<<"getShaderIdDirect(): name=\""<<name<<"\""<<std::endl;

	// Empty name means shader 0
	if(name == ""){
		infostream<<"getShaderIdDirect(): name is empty"<<std::endl;
		return 0;
	}

	// Check if already have such instance
	for(u32 i=0; i<m_shaderinfo_cache.size(); i++){
		ShaderInfo *info = &m_shaderinfo_cache[i];
		if(info->name == name && info->material_type == material_type &&
			info->drawtype == drawtype)
			return i;
	}

	/*
		Calling only allowed from main thread
	*/
	if (!thr_is_current_thread(m_main_thread)) {
		errorstream<<"ShaderSource::getShaderIdDirect() "
				"called not from main thread"<<std::endl;
		return 0;
	}

	ShaderInfo info = generate_shader(name, material_type, drawtype,
			m_device, m_callbacks, m_setter_factories, &m_sourcecache);

	/*
		Add shader to caches (add dummy shaders too)
	*/

	MutexAutoLock lock(m_shaderinfo_cache_mutex);

	u32 id = m_shaderinfo_cache.size();
	m_shaderinfo_cache.push_back(info);

	infostream<<"getShaderIdDirect(): "
			<<"Returning id="<<id<<" for name \""<<name<<"\""<<std::endl;

	return id;
}


ShaderInfo ShaderSource::getShaderInfo(u32 id)
{
	MutexAutoLock lock(m_shaderinfo_cache_mutex);

	if(id >= m_shaderinfo_cache.size())
		return ShaderInfo();

	return m_shaderinfo_cache[id];
}

void ShaderSource::processQueue()
{


}

void ShaderSource::insertSourceShader(const std::string &name_of_shader,
		const std::string &filename, const std::string &program)
{
	/*infostream<<"ShaderSource::insertSourceShader(): "
			"name_of_shader=\""<<name_of_shader<<"\", "
			"filename=\""<<filename<<"\""<<std::endl;*/

	sanity_check(thr_is_current_thread(m_main_thread));

	m_sourcecache.insert(name_of_shader, filename, program, true);
}

void ShaderSource::rebuildShaders()
{
	MutexAutoLock lock(m_shaderinfo_cache_mutex);

	/*// Oh well... just clear everything, they'll load sometime.
	m_shaderinfo_cache.clear();
	m_name_to_id.clear();*/

	/*
		FIXME: Old shader materials can't be deleted in Irrlicht,
		or can they?
		(This would be nice to do in the destructor too)
	*/

	// Recreate shaders
	for(u32 i=0; i<m_shaderinfo_cache.size(); i++){
		ShaderInfo *info = &m_shaderinfo_cache[i];
		if(info->name != ""){
			*info = generate_shader(info->name, info->material_type,
					info->drawtype, m_device, m_callbacks,
					m_setter_factories, &m_sourcecache);
		}
	}
}


ShaderInfo generate_shader(std::string name, u8 material_type, u8 drawtype,
		IrrlichtDevice *device, std::vector<ShaderCallback *> &callbacks,
		const std::vector<IShaderConstantSetterFactory*> &setter_factories,
		SourceShaderCache *sourcecache)
{
	ShaderInfo shaderinfo;
	shaderinfo.name = name;
	shaderinfo.material_type = material_type;
	shaderinfo.drawtype = drawtype;
	shaderinfo.material = video::EMT_SOLID;
	switch(material_type){
		case TILE_MATERIAL_BASIC:
			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
			break;
		case TILE_MATERIAL_ALPHA:
			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
			break;
		case TILE_MATERIAL_LIQUID_TRANSPARENT:
			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
			break;
		case TILE_MATERIAL_LIQUID_OPAQUE:
			shaderinfo.base_material = video::EMT_SOLID;
			break;
		case TILE_MATERIAL_WAVING_LEAVES:
			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
			break;
		case TILE_MATERIAL_WAVING_PLANTS:
			shaderinfo.base_material = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
		break;
	}

	bool enable_shaders = g_settings->getBool("enable_shaders");
	if (!enable_shaders)
		return shaderinfo;

	video::IVideoDriver* driver = device->getVideoDriver();
	sanity_check(driver);

	video::IGPUProgrammingServices *gpu = driver->getGPUProgrammingServices();
	if(!gpu){
		errorstream<<"generate_shader(): "
				"failed to generate \""<<name<<"\", "
				"GPU programming not supported."
				<<std::endl;
		return shaderinfo;
	}

	// Choose shader language depending on driver type and settings
	// Then load shaders
	std::string vertex_program;
	std::string pixel_program;
	std::string geometry_program;
	bool is_highlevel;
	load_shaders(name, sourcecache, driver->getDriverType(),
			enable_shaders, vertex_program, pixel_program,
			geometry_program, is_highlevel);
	// Check hardware/driver support
	if(vertex_program != "" &&
			!driver->queryFeature(video::EVDF_VERTEX_SHADER_1_1) &&
			!driver->queryFeature(video::EVDF_ARB_VERTEX_PROGRAM_1)){
		infostream<<"generate_shader(): vertex shaders disabled "
				"because of missing driver/hardware support."
				<<std::endl;
		vertex_program = "";
	}
	if(pixel_program != "" &&
			!driver->queryFeature(video::EVDF_PIXEL_SHADER_1_1) &&
			!driver->queryFeature(video::EVDF_ARB_FRAGMENT_PROGRAM_1)){
		infostream<<"generate_shader(): pixel shaders disabled "
				"because of missing driver/hardware support."
				<<std::endl;
		pixel_program = "";
	}
	if(geometry_program != "" &&
			!driver->queryFeature(video::EVDF_GEOMETRY_SHADER)){
		infostream<<"generate_shader(): geometry shaders disabled "
				"because of missing driver/hardware support."
				<<std::endl;
		geometry_program = "";
	}

	// If no shaders are used, don't make a separate material type
	if(vertex_program == "" && pixel_program == "" && geometry_program == "")
		return shaderinfo;

	// Create shaders header
	std::string shaders_header = "#version 120\n";

	static const char* drawTypes[] = {
		"NDT_NORMAL",
		"NDT_AIRLIKE",
		"NDT_LIQUID",
		"NDT_FLOWINGLIQUID",
		"NDT_GLASSLIKE",
		"NDT_ALLFACES",
		"NDT_ALLFACES_OPTIONAL",
		"NDT_TORCHLIKE",
		"NDT_SIGNLIKE",
		"NDT_PLANTLIKE",
		"NDT_FENCELIKE",
		"NDT_RAILLIKE",
		"NDT_NODEBOX",
		"NDT_GLASSLIKE_FRAMED",
		"NDT_FIRELIKE",
		"NDT_GLASSLIKE_FRAMED_OPTIONAL"
	};

	for (int i = 0; i < 14; i++){
		shaders_header += "#define ";
		shaders_header += drawTypes[i];
		shaders_header += " ";
		shaders_header += itos(i);
		shaders_header += "\n";
	}

	static const char* materialTypes[] = {
		"TILE_MATERIAL_BASIC",
		"TILE_MATERIAL_ALPHA",
		"TILE_MATERIAL_LIQUID_TRANSPARENT",
		"TILE_MATERIAL_LIQUID_OPAQUE",
		"TILE_MATERIAL_WAVING_LEAVES",
		"TILE_MATERIAL_WAVING_PLANTS"
	};

	for (int i = 0; i < 6; i++){
		shaders_header += "#define ";
		shaders_header += materialTypes[i];
		shaders_header += " ";
		shaders_header += itos(i);
		shaders_header += "\n";
	}

	shaders_header += "#define MATERIAL_TYPE ";
	shaders_header += itos(material_type);
	shaders_header += "\n";
	shaders_header += "#define DRAW_TYPE ";
	shaders_header += itos(drawtype);
	shaders_header += "\n";

	if (g_settings->getBool("generate_normalmaps")) {
		shaders_header += "#define GENERATE_NORMALMAPS 1\n";
	} else {
		shaders_header += "#define GENERATE_NORMALMAPS 0\n";
	}
	shaders_header += "#define NORMALMAPS_STRENGTH ";
	shaders_header += ftos(g_settings->getFloat("normalmaps_strength"));
	shaders_header += "\n";
	float sample_step;
	int smooth = (int)g_settings->getFloat("normalmaps_smooth");
	switch (smooth){
	case 0:
		sample_step = 0.0078125; // 1.0 / 128.0
		break;
	case 1:
		sample_step = 0.00390625; // 1.0 / 256.0
		break;
	case 2:
		sample_step = 0.001953125; // 1.0 / 512.0
		break;
	default:
		sample_step = 0.0078125;
		break;
	}
	shaders_header += "#define SAMPLE_STEP ";
	shaders_header += ftos(sample_step);
	shaders_header += "\n";

	if (g_settings->getBool("enable_bumpmapping"))
		shaders_header += "#define ENABLE_BUMPMAPPING\n";

	if (g_settings->getBool("enable_parallax_occlusion")){
		int mode = g_settings->getFloat("parallax_occlusion_mode");
		float scale = g_settings->getFloat("parallax_occlusion_scale");
		float bias = g_settings->getFloat("parallax_occlusion_bias");
		int iterations = g_settings->getFloat("parallax_occlusion_iterations");
		shaders_header += "#define ENABLE_PARALLAX_OCCLUSION\n";
		shaders_header += "#define PARALLAX_OCCLUSION_MODE ";
		shaders_header += itos(mode);
		shaders_header += "\n";
		shaders_header += "#define PARALLAX_OCCLUSION_SCALE ";
		shaders_header += ftos(scale);
		shaders_header += "\n";
		shaders_header += "#define PARALLAX_OCCLUSION_BIAS ";
		shaders_header += ftos(bias);
		shaders_header += "\n";
		shaders_header += "#define PARALLAX_OCCLUSION_ITERATIONS ";
		shaders_header += itos(iterations);
		shaders_header += "\n";
	}

	shaders_header += "#define USE_NORMALMAPS ";
	if (g_settings->getBool("enable_bumpmapping") || g_settings->getBool("enable_parallax_occlusion"))
		shaders_header += "1\n";
	else
		shaders_header += "0\n";

	if (g_settings->getBool("enable_waving_water")){
		shaders_header += "#define ENABLE_WAVING_WATER 1\n";
		shaders_header += "#define WATER_WAVE_HEIGHT ";
		shaders_header += ftos(g_settings->getFloat("water_wave_height"));
		shaders_header += "\n";
		shaders_header += "#define WATER_WAVE_LENGTH ";
		shaders_header += ftos(g_settings->getFloat("water_wave_length"));
		shaders_header += "\n";
		shaders_header += "#define WATER_WAVE_SPEED ";
		shaders_header += ftos(g_settings->getFloat("water_wave_speed"));
		shaders_header += "\n";
	} else{
		shaders_header += "#define ENABLE_WAVING_WATER 0\n";
	}

	shaders_header += "#define ENABLE_WAVING_LEAVES ";
	if (g_settings->getBool("enable_waving_leaves"))
		shaders_header += "1\n";
	else
		shaders_header += "0\n";

	shaders_header += "#define ENABLE_WAVING_PLANTS ";
	if (g_settings->getBool("enable_waving_plants"))
		shaders_header += "1\n";
	else
		shaders_header += "0\n";

	if (g_settings->getBool("tone_mapping"))
		shaders_header += "#define ENABLE_TONE_MAPPING\n";

	shaders_header += "#define FOG_START ";
	shaders_header += ftos(rangelim(g_settings->getFloat("fog_start"), 0.0f, 0.99f));
	shaders_header += "\n";

	// Call addHighLevelShaderMaterial() or addShaderMaterial()
	const c8* vertex_program_ptr = 0;
	const c8* pixel_program_ptr = 0;
	const c8* geometry_program_ptr = 0;
	if (!vertex_program.empty()) {
		vertex_program = shaders_header + vertex_program;
		vertex_program_ptr = vertex_program.c_str();
	}
	if (!pixel_program.empty()) {
		pixel_program = shaders_header + pixel_program;
		pixel_program_ptr = pixel_program.c_str();
	}
	if (!geometry_program.empty()) {
		geometry_program = shaders_header + geometry_program;
		geometry_program_ptr = geometry_program.c_str();
	}
	ShaderCallback *cb = new ShaderCallback(setter_factories);
	s32 shadermat = -1;
	if(is_highlevel){
		infostream<<"Compiling high level shaders for "<<name<<std::endl;
		shadermat = gpu->addHighLevelShaderMaterial(
			vertex_program_ptr,   // Vertex shader program
			"vertexMain",         // Vertex shader entry point
			video::EVST_VS_1_1,   // Vertex shader version
			pixel_program_ptr,    // Pixel shader program
			"pixelMain",          // Pixel shader entry point
			video::EPST_PS_1_2,   // Pixel shader version
			geometry_program_ptr, // Geometry shader program
			"geometryMain",       // Geometry shader entry point
			video::EGST_GS_4_0,   // Geometry shader version
			scene::EPT_TRIANGLES,      // Geometry shader input
			scene::EPT_TRIANGLE_STRIP, // Geometry shader output
			0,                         // Support maximum number of vertices
			cb, // Set-constant callback
			shaderinfo.base_material,  // Base material
			1                          // Userdata passed to callback
			);
		if(shadermat == -1){
			errorstream<<"generate_shader(): "
					"failed to generate \""<<name<<"\", "
					"addHighLevelShaderMaterial failed."
					<<std::endl;
			dumpShaderProgram(warningstream, "Vertex", vertex_program);
			dumpShaderProgram(warningstream, "Pixel", pixel_program);
			dumpShaderProgram(warningstream, "Geometry", geometry_program);
			delete cb;
			return shaderinfo;
		}
	}
	else{
		infostream<<"Compiling assembly shaders for "<<name<<std::endl;
		shadermat = gpu->addShaderMaterial(
			vertex_program_ptr,   // Vertex shader program
			pixel_program_ptr,    // Pixel shader program
			cb, // Set-constant callback
			shaderinfo.base_material,  // Base material
			0                     // Userdata passed to callback
			);

		if(shadermat == -1){
			errorstream<<"generate_shader(): "
					"failed to generate \""<<name<<"\", "
					"addShaderMaterial failed."
					<<std::endl;
			dumpShaderProgram(warningstream, "Vertex", vertex_program);
			dumpShaderProgram(warningstream,"Pixel", pixel_program);
			delete cb;
			return shaderinfo;
		}
	}
	callbacks.push_back(cb);

	// HACK, TODO: investigate this better
	// Grab the material renderer once more so minetest doesn't crash on exit
	driver->getMaterialRenderer(shadermat)->grab();

	// Apply the newly created material type
	shaderinfo.material = (video::E_MATERIAL_TYPE) shadermat;
	return shaderinfo;
}

void load_shaders(std::string name, SourceShaderCache *sourcecache,
		video::E_DRIVER_TYPE drivertype, bool enable_shaders,
		std::string &vertex_program, std::string &pixel_program,
		std::string &geometry_program, bool &is_highlevel)
{
	vertex_program = "";
	pixel_program = "";
	geometry_program = "";
	is_highlevel = false;

	if(enable_shaders){
		// Look for high level shaders
		if(drivertype == video::EDT_DIRECT3D9){
			// Direct3D 9: HLSL
			// (All shaders in one file)
			vertex_program = sourcecache->getOrLoad(name, "d3d9.hlsl");
			pixel_program = vertex_program;
			geometry_program = vertex_program;
		}
		else if(drivertype == video::EDT_OPENGL){
			// OpenGL: GLSL
			vertex_program = sourcecache->getOrLoad(name, "opengl_vertex.glsl");
			pixel_program = sourcecache->getOrLoad(name, "opengl_fragment.glsl");
			geometry_program = sourcecache->getOrLoad(name, "opengl_geometry.glsl");
		}
		if(vertex_program != "" || pixel_program != "" || geometry_program != ""){
			is_highlevel = true;
			return;
		}
	}

}

void dumpShaderProgram(std::ostream &output_stream,
		const std::string &program_type, const std::string &program)
{
	output_stream << program_type << " shader program:" << std::endl <<
		"----------------------------------" << std::endl;
	size_t pos = 0;
	size_t prev = 0;
	s16 line = 1;
	while ((pos = program.find("\n", prev)) != std::string::npos) {
		output_stream << line++ << ": "<< program.substr(prev, pos - prev) <<
			std::endl;
		prev = pos + 1;
	}
	output_stream << line << ": " << program.substr(prev) << std::endl <<
		"End of " << program_type << " shader program." << std::endl <<
		" " << std::endl;
}
	Commit message (Collapse)	Author	Age
*	Replace instances of std::map<std::string, std::string> with StringMap	kwolekr	2015-05-19
\| \| \| \| \| \|	Also, clean up surrounding code style Replace by-value parameter passing with const refs when possible Fix post-increment of iterators
*	Disable double-click -> ESC translation for main menu	Craig Robbins	2015-03-14
\|
*	Fix Exit to OS button focus in Pause Menu	ngosang	2015-02-10
\|
*	Network Layer 7 rework (Packet handling)	Loic Blot	2015-02-10
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	* Move networkcode to a dedicated directory * Rename clientserver.h to network/networkprotocol.h (Better name) and sanitize some includes * Create object NetworkPacket * It stores command (opcode) and data separated * It also stores peer_id * Data reading can be done by using a streaming interface * Change packet routing analysis * Remove old conditional analysis * Now uses function pointed analysis and add connection state ({Client,Server}::handlers) * Connection state permit to categorize condition to handle before analyze packets * Create a handler for depreciated messages, instead of duplicating code
*	Right mouse button behaviour for craft/inventory If right mousebutton ↵	Craig Robbins	2014-12-04
\| \| \| \|	clicked once then don't drop single items into slots. If right mouse button has been clicked and held a second time, drop items as the mouse is moved. In the second case (automatically drop/place items as mouse is moved) only auto-drop into blank slots, or slots that contain the same item.
*	Scale form elements consistently	Zefram	2014-11-30
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	The ratios between the sizes of form elements, including text, is now fixed, aside from variations caused by rounding. This makes form layout almost fully predictable, and particularly independent of player's screen size. The proportions of non-text elements are the traditional proportions. For compatibility, the way in which element positions and sizes are specified remains unchanged, in all its baroqueness, with one exception. The exception is that the position of a label[] element is now defined in terms of the vertically center of the first line of the label, rather than the bottom of the first line of the label. This change allows a label to be precisely aligned with button text or an edit box, which are positioned in a centering manner. Label positioning remains consistent with the previous system, just more precisely defined. Make multi-line label[] elements work properly. Previously the code set a bounding rectangle assuming that there would be only a single line, and as a result a multi-line label would be cut somewhere in the middle of the second line. Now multi-line labels not only work, but have guaranteed line spacing relative to inventory slots, to aid alignment. Incidentally fix tabheader[] elements which were being constrained to the wrong width. Given an unusually large form, in variable-size mode, the form rendering system now chooses a scale that will fit the entire form on the screen, if that doesn't make elements too small. Fixed-size forms, including the main menu, are have their sizes fixed in inch terms. The fixed size for fixed-size forms and the preferred and minimum sizes for variable-size forms all scale according to the gui_scaling parameter.
*	Implement proper font handling	sapier	2014-11-30
\|
*	Fix uninitialized variable warning	kwolekr	2014-10-30
\|
*	Remove m_ext_ptr in GUIFormSpecMenu, replaced by refcount mechanism	Kahrl	2014-10-24
\|
*	Add [colorize modifier	BlockMen	2014-10-05
\|
*	Add inventory right click drag and drop	sruz25	2014-09-21
\|
*	Allow taking screenshots of formspecs and move message to chat	BlockMen	2014-09-21
\|
*	Add srollbar formspec element	sapier	2014-07-16
\|
*	Add support for Android 2.3+	sapier	2014-06-29
\| \| \| \| \| \| \| \| \| \| \| \| \|	There have been plenty of ppl involved in creating this version. I don't wanna mention names as I'm sure I'd forget someone so I just tell where help has been done: - The partial android versions done by various ppl - Testing on different android devices - reviewing code (especially the in core changes) - testing controls - reviewing texts A big thank you to everyone helping this to be completed!
*	Add formspec api versioning	sapier	2014-06-29
\|
*	Add setting for tooltips show delay.	RealBadAngel	2014-06-25
\|
*	Tooltips rework.	RealBadAngel	2014-06-24
\| \| \| \| \|	Separate element for tooltips. Delayed showing, use global color or given ones.
*	Support for scalable font and gui elements	sapier	2014-06-22
\| \| \| \| \|	Fix positioning of tabheader in order to be usable for scaling GUIs WARNING: this changes position of current tabheaders, mods have to adjust!
*	Fix bounding rect for formspec elements label vertlabel and checkboxes	sapier	2014-06-18
\|
*	Add support for exiting formspecs by doubleclicking outside	sapier	2014-06-12
\|
*	Fix formspec replacement handling for in game formspecs	sapier	2014-04-22
\|
*	Fix game pause in singleplayer	BlockMen	2014-03-13
\|
*	Pass arguments by reference	Selat	2014-03-12
\|
*	Replace pause and message menu by formspec ones	sapier	2014-03-05
\|
*	Add formspec table	Kahrl	2014-01-13
\|
*	Reworked formspecs and kahrl's hexcolor parser	BlockMen	2013-11-03
\|
*	Send a on_receive_fields event when formspec is closed, with fields.quit = ↵	Novatux	2013-11-03
\| \| \| \|	"true"
*	Change mainmenu texture handling + small misc changes	Kahrl	2013-09-11
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	Texture names must now be escaped in formspec elements image[], background[], image_button[], image_button_exit[]. Instead of special-case handling of texture loading (and unloading which was missing) in guiFormSpecMenu.cpp, use the newly created ISimpleTextureSource interface which is a minimal subset of ITextureSource. There is an implementation of this interface used by GUIEngine (MenuTextureSource). Fix an off-by-one bug in unescape_string; it caused requests for a texture called "\0".
*	GUIFormSpecMenu focus fixes	Kahrl	2013-08-19
\|
*	Add translation for main menu	sapier	2013-08-17
\| \| \| \|	Add engine.gettext() and remove gettext() calls in guiFormspecMenu.cpp
*	Don't automatically scroll listbox when selecting an item in the middle	Kahrl	2013-08-16
\|
*	Formspec textlist: Black Irrlicht magic to detect fake doubleclicks	Kahrl	2013-08-16
\|
*	Omnicleanup: header cleanup, add ModApiUtil shared between game and mainmenu	Kahrl	2013-08-14
\|
*	Fix many formspec menu bugs	sapier	2013-07-07
\|
*	Use hexadecimal RRGGBB instead of colorkeys, rename getColor to parseColor	Sfan5	2013-07-06
\|
*	Replace C++ mainmenu by formspec powered one	sapier	2013-07-02
\|
*	Formspec: Don't perform black magic if selected item fits the guess	Kahrl	2013-06-18
\|
*	Migrate to STL containers/algorithms.	Ilya Zhuravlev	2013-03-11
\|
*	Update Copyright Years	Sfan5	2013-02-24
\|
*	Change Minetest-c55 to Minetest	PilzAdam	2013-02-24
\|
*	New elements in formspec, item_image and item_image_button.	RealBadAngel	2012-12-01
\| \| \| \|	Fixed also game bug drawing dragged item behind fields, buttons etc.
*	Make dragged itemstack following the mouse cursor much smoother	Jürgen Doser	2012-11-30
\| \| \| \|	by using the cursor coordinates directly, instead of updating them only when a mouse event is seen.
*	Adding background to Formspec	RealBadAngel	2012-11-08
\|
*	Make inventory GUI do sane things when server-side inventory acts unusually	Perttu Ahola	2012-09-02
\|
*	Detached inventories	Perttu Ahola	2012-07-24
\|
*	Formspec button_exit[] and image_button_exit[]	Perttu Ahola	2012-07-22
\|
*	minetest.register_on_player_receive_fields()	Perttu Ahola	2012-07-22
\|
*	Implement formspec	darkrose	2012-07-22