ShaderSource and silly example shaders

src/shader.h

@@ -0,0 +1,89 @@
+/*
+Minetest-c55
+Copyright (C) 2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2012 Kahrl <kahrl@gmx.net>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 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 General Public License for more details.
+
+You should have received a copy of the GNU 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.
+*/
+
+#ifndef SHADER_HEADER
+#define SHADER_HEADER
+
+#include "irrlichttypes_extrabloated.h"
+#include "threads.h"
+#include <string>
+
+class IGameDef;
+
+/*
+	shader.{h,cpp}: Shader handling stuff.
+*/
+
+/*
+	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);
+
+struct ShaderInfo
+{
+	std::string name;
+	video::E_MATERIAL_TYPE material;
+
+	ShaderInfo(): name(""), material(video::EMT_SOLID) {}
+};
+
+/*
+	ShaderSource creates and caches shaders.
+*/
+
+class IShaderSource
+{
+public:
+	IShaderSource(){}
+	virtual ~IShaderSource(){}
+	virtual u32 getShaderId(const std::string &name){return 0;}
+	virtual u32 getShaderIdDirect(const std::string &name){return 0;}
+	virtual std::string getShaderName(u32 id){return "";}
+	virtual ShaderInfo getShader(u32 id){return ShaderInfo();}
+	virtual ShaderInfo getShader(const std::string &name){return ShaderInfo();}
+};
+
+class IWritableShaderSource : public IShaderSource
+{
+public:
+	IWritableShaderSource(){}
+	virtual ~IWritableShaderSource(){}
+	virtual u32 getShaderId(const std::string &name){return 0;}
+	virtual u32 getShaderIdDirect(const std::string &name){return 0;}
+	virtual std::string getShaderName(u32 id){return "";}
+	virtual ShaderInfo getShader(u32 id){return ShaderInfo();}
+	virtual ShaderInfo getShader(const std::string &name){return ShaderInfo();}
+
+	virtual void processQueue()=0;
+	virtual void insertSourceShader(const std::string &name_of_shader,
+		const std::string &filename, const std::string &program)=0;
+	virtual void rebuildShaders()=0;
+};
+
+IWritableShaderSource* createShaderSource(IrrlichtDevice *device);
+
+#endif