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/* Copyright 2015 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF ANY PROPRIETARY RIGHTS.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include "pch.h"
#include "ShaderParser.h"
#include "BasicShaderSourceStreamFactory.h"
namespace std
{
DEFINE_ENUM_HASH( Diligent::SHADER_TYPE )
}
namespace Diligent
{
const Char* ShaderParser::ShaderLibName = "Shader";
class ShaderDescLoader;
template<>
class MemberBinder<ShaderDescLoader> : public MemberBinderBase
{
public:
MemberBinder( size_t MemberOffset, size_t Dummy ) :
MemberBinderBase( MemberOffset )
{
auto *pNameBinder = new BufferedStringBinder( offsetof( ShaderDesc, Name ),
// This is a small hack: we need to compute an offset from the beginning of ShaderDesc structure to
// the NameBuffer member of ShaderCreationAttribsWrapper:
offsetof( ShaderParser::ShaderCreationAttribsWrapper, NameBuffer ) - offsetof( ShaderParser::ShaderCreationAttribsWrapper, Desc.Name ) );
// No need to make a copy of Name since it is constant and HashMapStringKey will simply
// keep pointer to it
m_Bindings.insert( std::make_pair( "Name", std::unique_ptr<MemberBinderBase>(pNameBinder) ) );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderTypeEnumMapping, SHADER_TYPE_UNKNOWN );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderTypeEnumMapping, SHADER_TYPE_VERTEX );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderTypeEnumMapping, SHADER_TYPE_PIXEL );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderTypeEnumMapping, SHADER_TYPE_GEOMETRY );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderTypeEnumMapping, SHADER_TYPE_HULL );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderTypeEnumMapping, SHADER_TYPE_DOMAIN );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderTypeEnumMapping, SHADER_TYPE_COMPUTE );
DEFINE_ENUM_BINDER( m_Bindings, ShaderDesc, ShaderType, SHADER_TYPE, m_ShaderTypeEnumMapping )
}
virtual void GetValue( lua_State *L, const void* pBasePointer )
{
const auto *pShaderDesc = &GetMemberByOffest<ShaderDesc>( pBasePointer, m_MemberOffset );
PushLuaTable( L, pShaderDesc, m_Bindings );
}
virtual void SetValue( lua_State *L, int Index, void* pBasePointer )
{
auto *pShaderDesc = &GetMemberByOffest<ShaderDesc>(pBasePointer, m_MemberOffset);
ParseLuaTable( L, Index, pShaderDesc, m_Bindings );
}
private:
BindingsMapType m_Bindings;
EnumMapping<SHADER_TYPE> m_ShaderTypeEnumMapping;
};
ShaderParser::ShaderParser( IRenderDevice *pRenderDevice, lua_State *L, const String& ResMappingMetatableName ) :
EngineObjectParserCommon<IShader>( pRenderDevice, L, ShaderLibName ),
m_SetShadersBinding( this, L, "Context", "SetShaders", &ShaderParser::SetShaders ),
m_BindResourcesBinding( this, L, m_MetatableRegistryName.c_str(), "BindResources", &ShaderParser::BindResources ),
m_ResMappingMetatableName(ResMappingMetatableName)
{
DEFINE_BUFFERED_STRING_BINDER( m_Bindings, ShaderCreationAttribsWrapper, FilePath, FilePathBuffer )
DEFINE_BUFFERED_STRING_BINDER( m_Bindings, ShaderCreationAttribsWrapper, EntryPoint, EntryPointBuffer )
DEFINE_BUFFERED_STRING_BINDER( m_Bindings, ShaderCreationAttribsWrapper, SearchDirectories, SearchDirectoriesBuffer )
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderSourceLangEnumMapping, SHADER_SOURCE_LANGUAGE_DEFAULT );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderSourceLangEnumMapping, SHADER_SOURCE_LANGUAGE_HLSL );
DEFINE_ENUM_ELEMENT_MAPPING( m_ShaderSourceLangEnumMapping, SHADER_SOURCE_LANGUAGE_GLSL );
DEFINE_ENUM_BINDER( m_Bindings, ShaderCreationAttribsWrapper, SourceLanguage, SHADER_SOURCE_LANGUAGE, m_ShaderSourceLangEnumMapping );
DEFINE_BINDER( m_Bindings, ShaderCreationAttribsWrapper, Desc, ShaderDescLoader, 0 )
};
void ShaderParser::CreateObj( lua_State *L )
{
INIT_LUA_STACK_TRACKING( L );
ShaderCreationAttribsWrapper ShaderCreationAttrs;
ParseLuaTable( L, -1, &ShaderCreationAttrs, m_Bindings );
BasicShaderSourceStreamFactory BasicSSSFactory(ShaderCreationAttrs.SearchDirectories);
ShaderCreationAttrs.pShaderSourceStreamFactory = &BasicSSSFactory;
CHECK_LUA_STACK_HEIGHT();
IShader **ppShader = reinterpret_cast<IShader**>( lua_newuserdata( L, sizeof( IShader* ) ) );
*ppShader = nullptr;
m_pRenderDevice->CreateShader( ShaderCreationAttrs, ppShader );
if( *ppShader == nullptr )
SCRIPT_PARSING_ERROR(L, "Failed to create a shader")
CHECK_LUA_STACK_HEIGHT( +1 );
}
void ShaderParser::ReadField( lua_State *L, void *pData, const Char *Field )
{
ShaderCreationAttribsWrapper ShaderCreationAttrs;
auto *ppShader = reinterpret_cast<IShader**>(pData);
ShaderCreationAttrs.Desc = (*ppShader)->GetDesc();
PushField( L, &ShaderCreationAttrs, Field, m_Bindings );
}
int ShaderParser::SetShaders( lua_State *L )
{
// In order to communicate properly with Lua, a C function must use the following protocol,
// which defines the way parameters and results are passed : a C function receives its arguments
// from Lua in its PRIVATE stack in direct order( the first argument is pushed first ).So, when the
// function starts, lua_gettop( L ) returns the number of arguments received by the function.The first
// argument( if any ) is at index 1 and its last argument is at index lua_gettop( L ).
// To return values to Lua, a C function just pushes them onto the stack, in direct order
// ( the first result is pushed first ), and returns the number of results.
// Any other value in the stack below the results will be properly discarded by Lua.
// Like a Lua function, a C function called by Lua can also return many results.
auto NumArgs = lua_gettop( L );
const int MaxShaders = 6;
IShader* pShaders[MaxShaders] = {};
VERIFY( NumArgs <= MaxShaders, "Too many shaders are being set" );
NumArgs = std::min<int>( NumArgs, MaxShaders );
for( int i = 0; i < NumArgs; ++i )
{
pShaders[i] = *GetUserData<IShader**>(L, i+1, m_MetatableRegistryName.c_str() );
}
auto *pContext = LoadDeviceContextFromRegistry( L );
pContext->SetShaders( pShaders, NumArgs );
// Returning no arguments
return 0;
}
int ShaderParser::BindResources( lua_State *L )
{
try
{
auto NumArgs = lua_gettop( L );
if( NumArgs < 2 )
{
SCRIPT_PARSING_ERROR( L, "At least 1 argument (resource mapping) is expected" );
}
auto *pShader = *GetUserData<IShader**>( L, 1, m_MetatableRegistryName.c_str() );
VERIFY( pShader, "Shader pointer is null" );
if( !pShader )return 0;
auto *pResourceMapping = *GetUserData<IResourceMapping**>( L, 2, m_ResMappingMetatableName.c_str() );
if( !pResourceMapping )
{
SCRIPT_PARSING_ERROR( L, "Incorrect 1st argument type: resource mapping is expected" );
}
Uint32 Flags = 0;
// The last argument may be flags
const int FlagsArgInd = 3;
if( NumArgs >= FlagsArgInd &&
(lua_type( L, FlagsArgInd ) == LUA_TSTRING || lua_type( L, FlagsArgInd ) == LUA_TTABLE ) )
{
FlagsLoader<BIND_SHADER_RESOURCES_FLAGS> FlagsLoader(0, "BindShaderResourceFlags", m_BindShaderResFlagEnumMapping);
FlagsLoader.SetValue( L, FlagsArgInd, &Flags );
}
pShader->BindResources( pResourceMapping, Flags );
}
catch( const std::runtime_error& )
{
}
return 0;
}
}
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