//--------------------------------------------------------------
#include <sysutils.hpp>
#include <math.h>
#include <vcl.h>

#pragma hdrstop

#include "SimpleGLSLUnit.h"

#include "GLKeyboard.hpp"
#include "GLContext.hpp"
#include "GLFile3DS.hpp"

//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "GLBitmapFont"
#pragma link "GLCadencer"
#pragma link "GLGeomObjects"
#pragma link "GLHUDObjects"
#pragma link "GLObjects"
#pragma link "GLScene"
#pragma link "GLTexture"
#pragma link "GLUserShader"
#pragma link "GLVectorFileObjects"
#pragma link "GLWin32Viewer"
#pragma link "GLWindowsFont"
#pragma link "GLKeyboard"
#pragma link "GLContext"
#pragma link "GLFile3DS"
#pragma link "OpenGL1x"

#pragma link "GLBaseClasses"
#pragma link "GLCoordinates"
#pragma link "GLCrossPlatform"
#pragma link "GLMaterial"
#pragma resource "*.dfm"
TForm1 *Form1;
int CurrShad = 0;
AnsiString CurrShadName = "Blinn";

//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
		: TForm(Owner)
{
}

//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
  SetGLSceneMediaDir();
  ShaderActived = false;
  GLFreeForm1->LoadFromFile("teapot.3ds");

  MatLib->LibMaterialByName("Brick01")->Material->Texture->Image->LoadFromFile("mur_NormalMap.bmp");
  MatLib->LibMaterialByName("Brick02")->Material->Texture->Image->LoadFromFile("mur_Ambiant.bmp");
  MatLib->LibMaterialByName("Brick03")->Material->Texture->Image->LoadFromFile("mur_Hauteur.bmp");
}

//---------------------------------------------------------------------------
void __fastcall TForm1::GLCadencer1Progress(TObject *Sender,
	  const double deltaTime, const double newTime)
{
  if (IsKeyDown('1'))
  {
	CurrShadName= "Blinn";
    CurrShad= 0; } else
  if (IsKeyDown('2'))
  {
    CurrShadName= "Lambert";
    CurrShad= 1; } else
  if (IsKeyDown('3'))
  {
    CurrShadName= "Phong";
    CurrShad= 2; } else
  if (IsKeyDown('4'))
  {
    CurrShadName= "Rim";
    CurrShad= 3; } else
  if (IsKeyDown('5'))
  {
	CurrShadName= "SharpSpecular";
	CurrShad= 4; } else
  if (IsKeyDown('6'))
  {
    CurrShadName= "Sheen";
    CurrShad= 5; } else
  if (IsKeyDown('7'))
  {
    CurrShadName= "ThinPlastic";
    CurrShad= 6; } else
  if (IsKeyDown('8'))
  {
    CurrShadName= "Velvet";
    CurrShad= 7;
  }
  if (IsKeyDown('9'))
  {
    CurrShadName= "TEST TEXTURE BUMP";
    CurrShad= 8;
  }
  if (IsKeyDown('0'))
  {
    CurrShadName= "TEST Toon";
    CurrShad= 9;
  }
  if (CurrShad != 8)
  {
    DummyLight->Position->X= sin(DegToRad(newTime*15))*65;
    DummyLight->Position->Z= sin(DegToRad(newTime*15))*65;
  }
  GLSceneViewer1->Invalidate();
}

//---------------------------------------------------------------------------
void __fastcall TForm1::GLUserShader1DoApply(TObject *Sender,
	  TGLRenderContextInfo &rci)
{
  TVector3f vec,VecCol1,VecCol2;
  TGLLibMaterial *libMat;

  GLSLProg[CurrShad]->UseProgramObject();

  if ((CurrShad != 8) && (CurrShad != 9))
    GLSLProg[CurrShad]->Uniform4f["light"] = Light->AbsolutePosition;
  if ((CurrShad == 8))
  {
	// initialize the heightmap
	libMat = MatLib->LibMaterialByName("Brick01");
	{
	  libMat->PrepareBuildList();
	  glActiveTextureARB(GL_TEXTURE0_ARB);
      glBindTexture(GL_TEXTURE_2D, libMat->Material->Texture->Handle);
	  GLSLProg[CurrShad]->Uniform1i["Normal"]=0;
      glActiveTextureARB(GL_TEXTURE0_ARB);
    }
    libMat = MatLib->LibMaterialByName("Brick02");
    {
      libMat->PrepareBuildList();
      glActiveTextureARB(GL_TEXTURE1_ARB);
      glBindTexture(GL_TEXTURE_2D, libMat->Material->Texture->Handle);
      GLSLProg[CurrShad]->Uniform1i["base_tex"]=1;
      glActiveTextureARB(GL_TEXTURE0_ARB);
    }
    libMat = MatLib->LibMaterialByName("Brick03");
    {
      libMat->PrepareBuildList();
      glActiveTextureARB(GL_TEXTURE2_ARB);
      glBindTexture(GL_TEXTURE_2D, libMat->Material->Texture->Handle);
      GLSLProg[CurrShad]->Uniform1i["Base_Height"]=2;
      glActiveTextureARB(GL_TEXTURE0_ARB);
	}
	GLSLProg[CurrShad]->Uniform1f["u_invRad"]= 0.001;
	vec.X= 0.42200005; vec.Y= -0.04999996; vec.Z= 0;
	GLSLProg[CurrShad]->Uniform3f["cBumpSize"]= vec;
  }
  if ((CurrShad == 9))
  {
	VecCol1.X= 0.5; VecCol1.Y= 0.25; VecCol1.Z= 0.2;
	GLSLProg[CurrShad]->Uniform3f["DiffuseColor"]= VecCol1;
	VecCol2.X= 0.95; VecCol2.Y= 0.45; VecCol2.Z= 0.3;
	GLSLProg[CurrShad]->Uniform3f["PhongColor"]= VecCol2;
	GLSLProg[CurrShad]->Uniform1f["Edge"]= 0.25;
	GLSLProg[CurrShad]->Uniform1f["Phong"]= 0.5540001;
  }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::GLUserShader1DoUnApply(TObject *Sender, int Pass,
	  TGLRenderContextInfo &rci, bool &Continue)
{
  GLSLProg[CurrShad]->EndUseProgramObject();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
  Caption=Format("Simple GLSL Shader [%.2f FPS]", ARRAYOFCONST((GLSceneViewer1->FramesPerSecond())));
  GLHUDText1->Text= "GLKeyboard [1,2,3,4,5,6,7,8,9,0 ] Current Shader: "+CurrShadName;
  GLSceneViewer1->ResetPerformanceMonitor();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::GLSceneViewer1MouseDown(TObject *Sender,
      TMouseButton Button, TShiftState Shift, int X, int Y)
{
  mx = X;
  my = Y;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::GLSceneViewer1MouseMove(TObject *Sender,
      TShiftState Shift, int X, int Y)
{
  if (Shift.Contains(ssRight))
    Cam->MoveAroundTarget(my-Y, mx-X);
  mx = X;
  my = Y;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{
  GLCadencer1->Enabled = false;
  Timer1->Enabled = false;
  ShaderActived = false;
  for (int i=0; i<MAXSHADERS; i++)
  {
    GLSLProg[i]->Free();
  }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormMouseWheel(TObject *Sender, TShiftState Shift,
      int WheelDelta, TPoint &MousePos, bool &Handled)
{
  Cam->AdjustDistanceToTarget(Power(1.1, WheelDelta / 120));
}
//---------------------------------------------------------------------------

void __fastcall TForm1::GLDOInitializeRender(TObject *Sender,
	  TGLRenderContextInfo &rci)
{
  bool Continue;
  if (! ShaderActived)  /// Should be (! ShaderActived)
  {
	if (! ((GL_SHADER_OBJECT_ARB) &&
			(GL_VERTEX_PROGRAM_ARB) &&
			(GL_VERTEX_SHADER_ARB) &&
			(GL_FRAGMENT_SHADER_ARB)))
	{
	  ShowMessage("Your hardware does not support GLSL to execute this demo!");
	  //	  return (void) NULL; <- It's not necessary
	}
	//Blinn Shader
	GLSLProg[0] = new TGLProgramHandle(true);
	GLSLProg[0]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[0]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\blinn.glsl"),true);
	//Lambert Shader
	GLSLProg[1]= new TGLProgramHandle(true);
	GLSLProg[1]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[1]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\lambert.glsl"),true);
	//Phong Shader
	GLSLProg[2]= new TGLProgramHandle(true);
	GLSLProg[2]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[2]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\phong.glsl"),true);
	//Rim Shader
	GLSLProg[3]= new TGLProgramHandle(true);
	GLSLProg[3]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[3]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\rim.glsl"),true);
	//SharpSpecular Shader
	GLSLProg[4]= new TGLProgramHandle(true);
	GLSLProg[4]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[4]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\sharpspecular.glsl"),true);
	//Sheen Shader
	GLSLProg[5]= new TGLProgramHandle(true);
	GLSLProg[5]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[5]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\sheen.glsl"),true);
	//ThinPlastic Shader
	GLSLProg[6]= new TGLProgramHandle(true);
	GLSLProg[6]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[6]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\thinplastic.glsl"),true);
	//Velvet Shader
	GLSLProg[7]= new TGLProgramHandle(true);
	GLSLProg[7]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\vertex.glsl"),true);
	GLSLProg[7]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\velvet.glsl"),true);
	//TEST Texture Bump
	GLSLProg[8]= new TGLProgramHandle(true);
	GLSLProg[8]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\bump2.vert"),true);
	GLSLProg[8]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\bump2.frag"),true);
	//TEST Toon
	GLSLProg[9]= new TGLProgramHandle(true);
	GLSLProg[9]->AddShader(__classid(TGLVertexShaderHandle), LoadAnsiStringFromFile("Shaders\\toon.vert"),true);
	GLSLProg[9]->AddShader(__classid(TGLFragmentShaderHandle), LoadAnsiStringFromFile("Shaders\\toon.frag"),true);

	for (int i=0; i<MAXSHADERS; i++)
	{
	  if (! GLSLProg[i]->LinkProgram())
		throw Exception(GLSLProg[i]->InfoLog());
	  if (! GLSLProg[i]->ValidateProgram())
		throw Exception(GLSLProg[i]->InfoLog());
	}
	CheckOpenGLError();
	ShaderActived = true;
  }
  else
  if (ShaderActived)
  {
    GLUserShader1DoApply(this, rci);
    if (CurrShad != 8)
    {
      glPushMatrix();
      glColor4fv(GLSphere1->Material->FrontProperties->Diffuse->AsAddress());
      GLSphere1->DoRender(rci,true,false);
      glPopMatrix();
      glPushMatrix();
      glTranslatef(1, 0, 0);
      glColor4fv(GLCone1->Material->FrontProperties->Diffuse->AsAddress());
      GLCone1->DoRender(rci,true,false);
      glPopMatrix();
      glPushMatrix();
      glTranslatef(0, -1, 0);
      glScalef(0.015,0.015,0.015);
      glRotatef(90,-1,0,0);
      glColor4fv(GLFreeForm1->Material->FrontProperties->Diffuse->AsAddress());
      GLFreeForm1->DoRender(rci,true,false);
      glPopMatrix();
      glPushMatrix();
      glTranslatef(-1, 0, 0);
      glColor4fv(GLCube1->Material->FrontProperties->Diffuse->AsAddress());
      GLCube1->DoRender(rci,true,false);
      glPopMatrix();
    }
    else
    {
      glPushMatrix();
      GLCube1->DoRender(rci,true,false);
      glPopMatrix();
   }
 }
 GLUserShader1DoUnApply(this, 0, rci, Continue);
}
//---------------------------------------------------------------------------