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/*
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.
*/
#ifndef SHADER_HEADER
#define SHADER_HEADER
#include <IMaterialRendererServices.h>
#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 base_material;
video::E_MATERIAL_TYPE material;
u8 drawtype;
u8 material_type;
s32 user_data;
ShaderInfo(): name(""), base_material(video::EMT_SOLID),
material(video::EMT_SOLID),
drawtype(0), material_type(0) {}
virtual ~ShaderInfo() {}
};
/*
Setter of constants for shaders
*/
namespace irr { namespace video {
class IMaterialRendererServices;
} }
class IShaderConstantSetter {
public:
virtual ~IShaderConstantSetter(){};
virtual void onSetConstants(video::IMaterialRendererServices *services,
bool is_highlevel) = 0;
};
class IShaderConstantSetterFactory {
public:
virtual ~IShaderConstantSetterFactory() {};
virtual IShaderConstantSetter* create() = 0;
};
template <typename T, std::size_t count=1>
class CachedShaderSetting {
const char *m_name;
T m_sent[count];
bool has_been_set;
bool is_pixel;
protected:
CachedShaderSetting(const char *name, bool is_pixel) :
m_name(name), has_been_set(false), is_pixel(is_pixel)
{}
public:
void set(const T value[count], video::IMaterialRendererServices *services)
{
if (has_been_set && std::equal(m_sent, m_sent + count, value))
return;
if (is_pixel)
services->setPixelShaderConstant(m_name, value, count);
else
services->setVertexShaderConstant(m_name, value, count);
std::copy(value, value + count, m_sent);
has_been_set = true;
}
};
template <typename T, std::size_t count = 1>
class CachedPixelShaderSetting : public CachedShaderSetting<T, count> {
public:
CachedPixelShaderSetting(const char *name) :
CachedShaderSetting<T, count>(name, true){}
};
template <typename T, std::size_t count = 1>
class CachedVertexShaderSetting : public CachedShaderSetting<T, count> {
public:
CachedVertexShaderSetting(const char *name) :
CachedShaderSetting<T, count>(name, false){}
};
/*
ShaderSource creates and caches shaders.
*/
class IShaderSource {
public:
IShaderSource(){}
virtual ~IShaderSource(){}
virtual u32 getShaderIdDirect(const std::string &name,
const u8 material_type, const u8 drawtype){return 0;}
virtual ShaderInfo getShaderInfo(u32 id){return ShaderInfo();}
virtual u32 getShader(const std::string &name,
const u8 material_type, const u8 drawtype){return 0;}
};
class IWritableShaderSource : public IShaderSource {
public:
IWritableShaderSource(){}
virtual ~IWritableShaderSource(){}
virtual u32 getShaderIdDirect(const std::string &name,
const u8 material_type, const u8 drawtype){return 0;}
virtual ShaderInfo getShaderInfo(u32 id){return ShaderInfo();}
virtual u32 getShader(const std::string &name,
const u8 material_type, const u8 drawtype){return 0;}
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;
virtual void addShaderConstantSetterFactory(IShaderConstantSetterFactory *setter) = 0;
};
IWritableShaderSource* createShaderSource(IrrlichtDevice *device);
void dumpShaderProgram(std::ostream &output_stream,
const std::string &program_type, const std::string &program);
#endif
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