//-----------------------------------------------------------------------------
// Copyright (c) 2012 GarageGames, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// 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. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//-----------------------------------------------------------------------------

#include "platform/platform.h"
#include "shaderGen/HLSL/shaderGenHLSL.h"

#include "shaderGen/HLSL/shaderCompHLSL.h"
#include "shaderGen/featureMgr.h"


void ShaderGenPrinterHLSL::printShaderHeader(Stream& stream)
{
   const char *header1 = "//*****************************************************************************\r\n";
   const char *header2 = "// Torque -- HLSL procedural shader\r\n";

   stream.write( dStrlen(header1), header1 );
   stream.write( dStrlen(header2), header2 );
   stream.write( dStrlen(header1), header1 );

   const char* header3 = "\r\n";      
   stream.write( dStrlen(header3), header3 );
}

void ShaderGenPrinterHLSL::printMainComment(Stream& stream)
{
   const char * header5 = "// Main\r\n";
   const char * line    = "//-----------------------------------------------------------------------------\r\n";

   stream.write( dStrlen(line), line );
   stream.write( dStrlen(header5), header5 );
   stream.write( dStrlen(line), line );
}

void ShaderGenPrinterHLSL::printVertexShaderCloser(Stream& stream)
{
   const char *closer = "   return OUT;\r\n}\r\n";
   stream.write( dStrlen(closer), closer );
}

void ShaderGenPrinterHLSL::printPixelShaderOutputStruct(Stream& stream, const MaterialFeatureData &featureData)
{
   // Determine the number of output targets we need
   U32 numMRTs = 0;
   for( U32 i = 0; i < FEATUREMGR->getFeatureCount(); i++ )
   {
      const FeatureInfo &info = FEATUREMGR->getAt( i );
      if ( featureData.features.hasFeature( *info.type ) )
         numMRTs |= info.feature->getOutputTargets( featureData );
   }

   WRITESTR("struct Fragout\r\n");
   WRITESTR("{\r\n");

   WRITESTR("   float4 col : SV_Target0;\r\n");
   for (U32 i = 1; i < 4; i++)
   {
      if (numMRTs & 1 << i)
         WRITESTR(avar("   float4 col%d : SV_Target%d;\r\n", i, i));
   }
   
   WRITESTR("};\r\n");
   WRITESTR("\r\n");
   WRITESTR("\r\n");
}

void ShaderGenPrinterHLSL::printPixelShaderCloser(Stream& stream)
{
   WRITESTR( "\r\n   return OUT;\r\n}\r\n" );
}

void ShaderGenPrinterHLSL::printLine(Stream& stream, const String& line)
{
   stream.write(line.length(), line.c_str());
   const char* end = "\r\n";
   stream.write(dStrlen(end), end);
}

const char* ShaderGenComponentFactoryHLSL::typeToString( GFXDeclType type )
{
   switch ( type )
   {
      default:
      case GFXDeclType_Float:
         return "float";

      case GFXDeclType_Float2:
         return "float2";

      case GFXDeclType_Float3:
         return "float3";

      case GFXDeclType_Float4:
      case GFXDeclType_Color:
         return "float4";
      
	  case GFXDeclType_UByte4:
         return "uint4";
   }
}

ShaderComponent* ShaderGenComponentFactoryHLSL::createVertexInputConnector( const GFXVertexFormat &vertexFormat )
{
   ShaderConnectorHLSL *vertComp = new ShaderConnectorHLSL;
   vertComp->setName( "VertData" );

   // Loop thru the vertex format elements.
   for ( U32 i=0; i < vertexFormat.getElementCount(); i++ )
   {
      const GFXVertexElement &element = vertexFormat.getElement( i );
      
      Var *var = NULL;

      if ( element.isSemantic( GFXSemantic::POSITION ) )
      {
         var = vertComp->getElement( RT_POSITION );
         var->setName( "position" );
      }
      else if ( element.isSemantic( GFXSemantic::NORMAL ) )
      {
         var = vertComp->getElement( RT_NORMAL );
         var->setName( "normal" );
      }
      else if ( element.isSemantic( GFXSemantic::TANGENT ) )
      {
         var = vertComp->getElement( RT_TANGENT );
         var->setName( "T" );
      }
      else if ( element.isSemantic( GFXSemantic::TANGENTW ) )
      {
         var = vertComp->getIndexedElement(element.getSemanticIndex(), RT_TEXCOORD);
         var->setName("tangentW");
      }
      else if ( element.isSemantic( GFXSemantic::BINORMAL ) )
      {
         var = vertComp->getElement( RT_BINORMAL );
         var->setName( "B" );
      }
      else if ( element.isSemantic( GFXSemantic::COLOR ) )
      {
         var = vertComp->getElement( RT_COLOR );
         var->setName( "diffuse" );
      }
      else if ( element.isSemantic( GFXSemantic::TEXCOORD ) )
      {
         var = vertComp->getIndexedElement( element.getSemanticIndex(), RT_TEXCOORD );
         if ( element.getSemanticIndex() == 0 )
            var->setName( "texCoord" );
         else
            var->setName( String::ToString( "texCoord%d", element.getSemanticIndex() + 1 ) );
      }
      else if ( element.isSemantic( GFXSemantic::BLENDINDICES ) )
      {
         var = vertComp->getIndexedElement( element.getSemanticIndex(), RT_BLENDINDICES );
         var->setName( String::ToString( "blendIndices%d", element.getSemanticIndex() ) );
      }
      else if ( element.isSemantic( GFXSemantic::BLENDWEIGHT ) )
      {
         var = vertComp->getIndexedElement( element.getSemanticIndex(), RT_BLENDWEIGHT );
         var->setName( String::ToString( "blendWeight%d", element.getSemanticIndex() ) );
      }
      else if ( element.isSemantic( GFXSemantic::PADDING ) )
      {
         var = NULL;
         //var = vertComp->getIndexedElement( vertComp->getCurTexElem() + element.getSemanticIndex(), RT_TEXCOORD );
         //var->setName( String::ToString( "pad%d", element.getSemanticIndex() + 1 ) );
      }
      else
      {
         // Everything else is a texcoord!
         var = vertComp->getIndexedElement( element.getSemanticIndex(), RT_TEXCOORD );
         var->setName( "tc" + element.getSemantic() );
      }

      if ( !var )
         continue;

      var->setStructName( "IN" );
      var->setType( typeToString( element.getType() ) );
   }

   return vertComp;
}

ShaderComponent* ShaderGenComponentFactoryHLSL::createVertexPixelConnector()
{
   ShaderComponent* comp = new ShaderConnectorHLSL;
   ((ShaderConnector*)comp)->setName("ConnectData");
   return comp;
}

ShaderComponent* ShaderGenComponentFactoryHLSL::createVertexParamsDef()
{
   ShaderComponent* comp = new VertexParamsDefHLSL;
   return comp;
}

ShaderComponent* ShaderGenComponentFactoryHLSL::createPixelParamsDef()
{
   ShaderComponent* comp = new PixelParamsDefHLSL;
   return comp;
}