backGlass.cpp

#include "stdafx.h"

#include <rapidxml_utils.hpp>

#include "backGlass.h"
#include "RenderDevice.h"
#include "Shader.h"
#include "captureExt.h"

//#define WRITE_BACKGLASS_IMAGES
#ifdef WRITE_BACKGLASS_IMAGES
 #include <iostream>
 #include <fstream>
#endif

//XML helpers

inline char nextChar(size_t &inPos, const size_t inSize, const char* const inChars, const char* const outChars, const char* const inData) {
   char c = (inPos >= inSize) ? '=' : inData[inPos];
   while (outChars[c] < 0) {
      inPos++;
      c = (inPos >= inSize) ? '=' : inData[inPos];
   }
   inPos++;
   return c;
}

/*
returns actual data size if successful or -1 if something went wrong.
*/
static size_t decode_base64(const char* const inData, char* const outData, const size_t inSize, const size_t outSize) {
   static constexpr char inChars[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
   static char* outChars = nullptr;
   //Create decode table from encode table
   if (!outChars) {
      outChars = new char[256];
      for (size_t i = 0;i < 256;++i) outChars[i] = 0;
      for (char i = 0;i < 64;++i) outChars[inChars[i]] = i;
      //Hack for fast skipping
      outChars['&'] = -1;
      outChars[10] = -1;
      outChars[13] = -1;
   }

   size_t inPos = 0;
   size_t outPos = 0;
   bool done = false;
   unsigned int padding = 0;
   while ((inPos < inSize) && (outPos < outSize) && !done) {
      char b1 = nextChar(inPos, inSize, inChars, outChars, inData);
      char b2 = nextChar(inPos, inSize, inChars, outChars, inData);
      char b3 = nextChar(inPos, inSize, inChars, outChars, inData);
      char b4 = nextChar(inPos, inSize, inChars, outChars, inData);

      done = (b1 == '=' || b2 == '=' || b3 == '=' || b4 == '=');
      if (done) {
         if (b1 == '=') padding += 3;
         else if (b2 == '=') padding += 3;
         else if (b3 == '=') padding += 2;
         else if (b4 == '=') padding++;
      }
      b1 = outChars[b1];
      b2 = outChars[b2];
      b3 = outChars[b3];
      b4 = outChars[b4];
      outData[outPos] = (b1 << 2) | (b2 >> 4);
      if (outPos + 1 < outSize) outData[outPos + 1] = (b2 << 4) | (b3 >> 2);
      if (outPos + 2 < outSize) outData[outPos + 2] = (b3 << 6) | (b4);
      outPos += 3;
   }
   return min(outPos - padding, outSize);
}

//Actual Backglass code

BackGlass::BackGlass(RenderDevice* const pd3dDevice, Texture * backgroundFallback) :
   m_pd3dDevice(pd3dDevice), m_backgroundFallback(backgroundFallback)
{
   m_backgroundTexture = nullptr;
   m_loaded_image = nullptr;
#ifdef ENABLE_VR
   //Check for a directb2s and try to use its backglass data
   string b2sFileName = g_pplayer->m_ptable->m_szFileName;
   b2sFileName = b2sFileName.substr(0, b2sFileName.find_last_of('.'));
   b2sFileName.append(".directb2s");
   m_backglass_dmd = int2(0,0);
   m_backglass_dmd_width = 0;
   m_backglass_dmd_height = 0;
   m_backglass_grill_height = 0;
   m_backglass_width = 0;
   m_backglass_height = 0;
   m_dmd_width = 0;
   m_dmd_height = 0;
   m_dmd = Vertex2D(0.f,0.f);

   std::ifstream infile(b2sFileName);
   if (!infile.good())
      return;

   char* data = nullptr;

   try {
      rapidxml::file<> b2sFile(b2sFileName.c_str());
      rapidxml::xml_document<> b2sTree;
      b2sTree.parse<0>(b2sFile.data());
      auto rootNode = b2sTree.first_node("DirectB2SData");
      if (!rootNode) {
         return;
      }
      size_t data_len = 0;
      auto currentNode = rootNode->first_node();
      while (currentNode) {//Iterate all Nodes within DirectB2SData
         char* nodeName = currentNode->name();
         if (strcmp(nodeName, "VRDMDLocation") == 0) {
            auto attrib = currentNode->first_attribute("LocX");
            if (attrib) m_backglass_dmd.x = atoi(attrib->value());
            attrib = currentNode->first_attribute("LocY");
            if (attrib) m_backglass_dmd.y = atoi(attrib->value());
            attrib = currentNode->first_attribute("Width");
            if (attrib) m_backglass_dmd_width = atoi(attrib->value());
            attrib = currentNode->first_attribute("Height");
            if (attrib) m_backglass_dmd_height = atoi(attrib->value());
         }
         else if (strcmp(nodeName, "GrillHeight") == 0) {
            auto attrib = currentNode->first_attribute("Value");
            if (attrib) m_backglass_grill_height = atoi(attrib->value());
         }
         else if (strcmp(nodeName, "Illumination") == 0) {
            auto illuminationNode = currentNode->first_node();
            int bulb = 1;
            while (illuminationNode) {//Iterate all Nodes within Illumination
               auto attrib = illuminationNode->first_attribute("Image");
               if (attrib) {
                  if (data_len < attrib->value_size() * 3 / 4 + 1) {
                     delete [] data;
                     data_len = attrib->value_size() * 3 / 4 + 1;
                     data = new char[data_len];
                  }
                  size_t size = decode_base64(attrib->value(), data, attrib->value_size(), data_len);
#ifdef WRITE_BACKGLASS_IMAGES
                  if (WRITE_BACKGLASS_IMAGES > 0 && size > 0) {//Write Image to disk. Also check if the base64 decoder is working...
                     string imageFileName = b2sFileName;
                     imageFileName.append(illuminationNode->name()).append(".bulb").append(std::to_string(bulb)).append(".png");//if it is not a png just rename it...
                     std::ofstream imageFile(imageFileName, std::ios::out | std::ios::binary | std::ios::trunc);
                     if (imageFile.is_open()) {
                        imageFile.write(data, size);
                        imageFile.close();
                     }
                  }
#endif
                  if (size > 0) {
                     //Handle Bulb light images
                  }
               }
               illuminationNode = illuminationNode->next_sibling();
               bulb++;
            }
         }
         else if (strcmp(nodeName, "Images") == 0) {
            auto imagesNode = currentNode->first_node();
            while (imagesNode) {//Iterate all Nodes within Images
               auto attrib = imagesNode->first_attribute("Value");
               if (attrib) {
                  if (data_len < attrib->value_size() * 3 / 4 + 1) {
                     delete [] data;
                     data_len = attrib->value_size() * 3 / 4 + 1;
                     data = new char[data_len];
                  }
                  size_t size = decode_base64(attrib->value(), data, attrib->value_size(), data_len);
                  if ((size > 0) && (strcmp(imagesNode->name(), "BackglassImage") == 0)) {
                     m_loaded_image = BaseTexture::CreateFromData(data, size);
                     m_backgroundTexture = m_pd3dDevice->m_texMan.LoadTexture(m_loaded_image, SF_TRILINEAR, SA_CLAMP, SA_CLAMP, false);
                     m_backglass_width = m_backgroundTexture->GetWidth();
                     m_backglass_height = m_backgroundTexture->GetHeight();
                  }
#ifdef WRITE_BACKGLASS_IMAGES
                  if (WRITE_BACKGLASS_IMAGES > 0 && size > 0) {//Write Image to disk. Also useful to check if the base64 decoder is working...
                     string imageFileName = b2sFileName;
                     imageFileName.append(imagesNode->name()).append(".png");//if it is not a png just rename it...
                     std::ofstream imageFile(imageFileName, std::ios::out | std::ios::binary | std::ios::trunc);
                     if (imageFile.is_open()) {
                        imageFile.write(data, size);
                        imageFile.close();
                     }
                  }
#endif
               }
               imagesNode = imagesNode->next_sibling();
            }
         }
         currentNode = currentNode->next_sibling();
      }
   }
   catch (...) {//If file does not exist, or something else goes wrong just disable the Backglass. This is very experimental anyway.
      m_backgroundTexture = nullptr;
   }
   delete [] data;
   float tableWidth, glassHeight;
   g_pplayer->m_ptable->get_Width(&tableWidth);
   g_pplayer->m_ptable->get_GlassHeight(&glassHeight);
   if (m_backglass_width>0 && m_backglass_height>0)
      m_pd3dDevice->DMDShader->SetVector(SHADER_backBoxSize, tableWidth * (0.5f - m_backglass_scale / 2.0f), glassHeight, m_backglass_scale * tableWidth, m_backglass_scale * tableWidth * (float)m_backglass_height / (float)m_backglass_width);
   else
      m_pd3dDevice->DMDShader->SetVector(SHADER_backBoxSize, tableWidth * (0.5f - m_backglass_scale / 2.0f), glassHeight, m_backglass_scale * tableWidth, m_backglass_scale * tableWidth * (float)(9.0 / 16.0));
   if (m_backglass_dmd_width > 0 && m_backglass_dmd_height > 0 && m_backglass_width > 0 && m_backglass_height > 0) {
      m_dmd_width = (float)m_backglass_dmd_width / (float)m_backglass_width;
      m_dmd_height = (float)m_backglass_dmd_height / (float)m_backglass_height;
      m_dmd.x = tableWidth * m_backglass_scale * (float)m_backglass_dmd.x / (float)m_backglass_width;
      m_dmd.y = tableWidth * m_backglass_scale * (1.0f - (float)m_backglass_dmd.y / (float)m_backglass_height - m_dmd_height);
   }
#endif
}

BackGlass::~BackGlass()
{
   delete m_loaded_image;
}

void BackGlass::Render()
{
   RenderDevice::RenderStateCache initial_state;
   m_pd3dDevice->CopyRenderStates(true, initial_state);
   if (g_pplayer->m_texPUP)
   {
      m_backgroundTexture = m_pd3dDevice->m_texMan.LoadTexture(g_pplayer->m_texPUP, SF_TRILINEAR, SA_CLAMP, SA_CLAMP, false);
      m_backglass_width = g_pplayer->m_texPUP->width();
      m_backglass_height = g_pplayer->m_texPUP->height();
      float tableWidth, glassHeight;
      g_pplayer->m_ptable->get_Width(&tableWidth);
      g_pplayer->m_ptable->get_GlassHeight(&glassHeight);
      if (g_pplayer->m_texdmd)
      {
         // If we expect a DMD the captured image is probably missing a grill in 3scr mode
         // 3scr mode preferable to support VR rooms, so better to just drop the grills in this experimental mode.
         const int dmdheightoff = (int)(m_backglass_scale * tableWidth * (float)(9.0 / 16.0) * .3f);
         const int dmdheightextra = (int)(tableWidth * .05f);
         glassHeight += (float)(dmdheightoff + dmdheightextra);

         m_pd3dDevice->DMDShader->SetVector(SHADER_backBoxSize, tableWidth * (0.5f - m_backglass_scale / 2.0f), glassHeight, m_backglass_scale * tableWidth, m_backglass_scale * tableWidth * (float)(9.0 / 16.0));

         // We lost the grill, so make a nice big DMD.
         m_dmd_width = 0.8f;
         m_dmd_height = m_dmd_width / 4.0f;
         m_dmd.x = tableWidth * (0.5f - m_dmd_width / 2.0f);
         m_dmd.y = (float)(-dmdheightoff + dmdheightextra / 2);
      }
      else
         m_pd3dDevice->DMDShader->SetVector(SHADER_backBoxSize, tableWidth * (0.5f - m_backglass_scale / 2.0f), glassHeight, m_backglass_scale * tableWidth, m_backglass_scale * tableWidth * (float)(3.0 / 4.0));
   }

   if (m_backgroundTexture)
      m_pd3dDevice->DMDShader->SetTexture(SHADER_tex_sprite, m_backgroundTexture);
   else if (m_backgroundFallback)
      m_pd3dDevice->DMDShader->SetTexture(SHADER_tex_sprite, m_backgroundFallback, SF_TRILINEAR, SA_CLAMP, SA_CLAMP);
   else return;

   m_pd3dDevice->SetRenderState(RenderDevice::ZWRITEENABLE, RenderDevice::RS_FALSE);
   m_pd3dDevice->SetRenderState(RenderDevice::ZENABLE, RenderDevice::RS_FALSE);
   m_pd3dDevice->SetRenderStateCulling(RenderDevice::CULL_NONE);

   m_pd3dDevice->SetRenderState(RenderDevice::ALPHABLENDENABLE, RenderDevice::RS_FALSE);

   m_pd3dDevice->DMDShader->SetTechnique(SHADER_TECHNIQUE_basic_noDMD);

   m_pd3dDevice->DMDShader->SetVector(SHADER_vColor_Intensity, 1.0f, 1.0f, 1.0f, 1.0f);

   static constexpr float Verts[4 * 5] =
      /* {
       1.0f,  1.0f, 0.0f, 1.0f, 0.0f,
      -1.0f,  1.0f, 0.0f, 0.0f, 0.0f,
       1.0f, -1.0f, 0.0f, 1.0f, 1.0f,
      -1.0f, -1.0f, 0.0f, 0.0f, 1.0f
   };*/
      {
         1.0f, 1.0f, 0.0f, 1.0f, 0.0f,
         0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
         1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
         0.0f, 0.0f, 0.0f, 0.0f, 1.0f
      };
   m_pd3dDevice->DMDShader->Begin();
   m_pd3dDevice->DrawTexturedQuad((Vertex3D_TexelOnly*)Verts);
   m_pd3dDevice->DMDShader->End();

   m_pd3dDevice->CopyRenderStates(false, initial_state);
}

void BackGlass::GetDMDPos(float& DMDposx, float& DMDposy, float& DMDwidth, float& DMDheight)
{
   if (m_backgroundTexture)
   { // For VR, place DMD in the backglass
      if (m_dmd_width == 0.0f || m_dmd_height == 0.0f)
      { // If file contains no valid VRDMD position
         if (m_backglass_grill_height > 0)
         {
            // DMD is centered in the Grill of the backglass
            constexpr float scale = 0.5f; // 0.5 => use 50% of the height of the grill.
            float tableWidth;
            g_pplayer->m_ptable->get_Width(&tableWidth);
            tableWidth *= m_backglass_scale;
            m_dmd_height = m_backglass_scale * scale * (float)m_backglass_grill_height / (float)m_backglass_width;
            m_dmd_width = m_dmd_height / (float)g_pplayer->m_texdmd->height() * (float)g_pplayer->m_texdmd->width();
            m_dmd.x = tableWidth * (0.5f - m_dmd_width / 2.0f);
            m_dmd.y = tableWidth * (float)m_backglass_grill_height * (0.5f - scale / 2.0f) / (float)m_backglass_width;
         }
      }
      DMDposx = (float)m_dmd.x;
      DMDposy = (float)m_dmd.y;
      DMDwidth = (float)m_dmd_width;
      DMDheight = (float)m_dmd_height;
   }
}