#include "tgl.h"

#include "tconvert.h"

#include "tofflinegl.h"

#include "trop.h"

#include "timage_io.h"

#include "tcurves.h"

#ifndef __sgi

#ifdef _WIN32

#include <cstdlib></cstdlib>

#include <gl glut.h=""></gl>

#elif defined(LINUX) || defined(FREEBSD)

#include <gl glut.h=""></gl>

#else

#include <glut glut.h=""></glut>

#endif

#endif

#if defined(MACOSX) || defined(LINUX) || defined(FREEBSD)

#include <qglcontext></qglcontext>

#endif

//#include "tthread.h"

#undef SCALE_BY_GLU

//#undef NEW_DRAW_TEXT

//-----------------------------------------------------------------------------

namespace {

// GLUquadric*  localDisk=0;

/*

  Find the number of slices in function of radius size.

  \par radius of circle

  \par size of pixel

  \ret number of division to obtain a circle

  */

int computeSlices(double radius, double pixelSize = 1.0) {

  if (radius < 0) return 2;

  double thetaStep;

  double temp = pixelSize * 0.5 / radius;

  if (fabs(1.0 - temp) <= 1)

    thetaStep = acos(1.0 - temp);

  else

    thetaStep = M_PI_4;

  assert(thetaStep != 0.0);

  int numberOfSlices = (int)(M_2PI / thetaStep);

  return numberOfSlices != 0 ? numberOfSlices : 2;

}

}  // end of unnamed namespace

//-----------------------------------------------------------------------------

double tglGetPixelSize2() {

  double mat[16];

  glMatrixMode(GL_MODELVIEW);

  glGetDoublev(GL_MODELVIEW_MATRIX, mat);

  double det                      = fabs(mat[0] * mat[5] - mat[1] * mat[4]);

  if (det < TConsts::epsilon) det = TConsts::epsilon;

  return 1.0 / det;

}

//-----------------------------------------------------------------------------

double tglGetTextWidth(const std::string &s, void *font) {

  double factor = 0.07;

  double w      = 0;

  for (int i = 0; i < (int)s.length(); i++) w += glutStrokeWidth(font, s[i]);

  return w * factor;

}

//-----------------------------------------------------------------------------

void tglDrawText(const TPointD &p, const std::string &s, void *character) {

#ifndef __sgi

  glPushMatrix();

  glTranslated(p.x, p.y, 0);

  double factor = 0.07;

  glScaled(factor, factor, factor);

  for (int i = 0; i < (int)s.size(); i++) glutStrokeCharacter(character, s[i]);

  glPopMatrix();

#else

  assert("Not Yet Implemented" && 0);

  std::cout << s << std::endl;

#endif

}

//-----------------------------------------------------------------------------

void tglDrawText(const TPointD &p, const std::wstring &s, void *character) {

#ifndef __sgi

  glPushMatrix();

  glTranslated(p.x, p.y, 0);

  double factor = 0.07;

  glScaled(factor, factor, factor);

  for (int i = 0; i < (int)s.size(); i++) glutStrokeCharacter(character, s[i]);

  glPopMatrix();

#else

  assert("Not Yet Implemented" && 0);

  std::cout << s << std::endl;

#endif

}

//-----------------------------------------------------------------------------

void tglDrawSegment(const TPointD &p1, const TPointD &p2) {

  glBegin(GL_LINES);

  tglVertex(p1);

  tglVertex(p2);

  glEnd();

}

//-----------------------------------------------------------------------------

void tglDrawCircle(const TPointD ¢er, double radius) {

  if (radius <= 0) return;

  double pixelSize = 1;

  int slices       = 60;

  if (slices <= 0) slices = computeSlices(radius, pixelSize) >> 1;

  double step  = M_PI / slices;

  double step2 = 2.0 * step;

  double cos_t, sin_t, cos_ts, sin_ts, t;

  glPushMatrix();

  glTranslated(center.x, center.y, 0.0);

  glBegin(GL_LINES);

  cos_t = radius /* *1.0*/;

  sin_t = 0.0;

  for (t = 0; t + step < M_PI_2; t += step2) {

    cos_ts = radius * cos(t + step);

    sin_ts = radius * sin(t + step);

    glVertex2f(cos_t, sin_t);

    glVertex2f(cos_ts, sin_ts);

    glVertex2f(-cos_t, sin_t);

    glVertex2f(-cos_ts, sin_ts);

    glVertex2f(-cos_t, -sin_t);

    glVertex2f(-cos_ts, -sin_ts);

    glVertex2f(cos_t, -sin_t);

    glVertex2f(cos_ts, -sin_ts);

    cos_t = cos_ts;

    sin_t = sin_ts;

  }

  cos_ts = 0.0;

  sin_ts = radius /* *1.0*/;

  glVertex2f(cos_t, sin_t);

  glVertex2f(cos_ts, sin_ts);

  glVertex2f(-cos_t, sin_t);

  glVertex2f(-cos_ts, sin_ts);

  glVertex2f(-cos_t, -sin_t);

  glVertex2f(-cos_ts, -sin_ts);

  glVertex2f(cos_t, -sin_t);

  glVertex2f(cos_ts, -sin_ts);

  glEnd();

  glPopMatrix();

}

//-----------------------------------------------------------------------------

void tglDrawDisk(const TPointD &c, double r) {

  if (r <= 0) return;

  double pixelSize = 1;

  int slices       = 60;

  if (slices <= 0) slices = computeSlices(r, pixelSize) >> 1;

  glPushMatrix();

  glTranslated(c.x, c.y, 0.0);

  GLUquadric *quadric = gluNewQuadric();

  gluDisk(quadric, 0, r, slices, 1);

  gluDeleteQuadric(quadric);

  glPopMatrix();

}

//-----------------------------------------------------------------------------

void tglDrawRect(const TRectD &rect) {

  glBegin(GL_LINE_LOOP);

  tglVertex(rect.getP00());

  tglVertex(rect.getP10());

  tglVertex(rect.getP11());

  tglVertex(rect.getP01());

  glEnd();

}

//-----------------------------------------------------------------------------

void tglFillRect(const TRectD &rect) {

  glBegin(GL_POLYGON);

  tglVertex(rect.getP00());

  tglVertex(rect.getP10());

  tglVertex(rect.getP11());

  tglVertex(rect.getP01());

  glEnd();

}

//-----------------------------------------------------------------------------

void tglRgbOnlyColorMask() {

  tglMultColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE);

  tglEnableBlending(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

}

//-----------------------------------------------------------------------------

void tglAlphaOnlyColorMask() {

  tglMultColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_TRUE);

  tglEnableBlending(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);

}

//-----------------------------------------------------------------------------

void tglEnableBlending(GLenum src, GLenum dst) {

  glEnable(GL_BLEND);

  glBlendFunc(src, dst);

}

//-----------------------------------------------------------------------------

void tglEnableLineSmooth(bool enable, double lineSize) {

  if (enable) {

    glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);

    glEnable(GL_LINE_SMOOTH);

    glLineWidth(lineSize);

  } else

    glDisable(GL_LINE_SMOOTH);

}

//-----------------------------------------------------------------------------

void tglEnablePointSmooth(double pointSize) {

  glEnable(GL_BLEND);

  glPointSize(pointSize);

}

//-----------------------------------------------------------------------------

void tglGetColorMask(GLboolean &red, GLboolean &green, GLboolean &blue,

                     GLboolean &alpha) {

  GLboolean channels[4];

  glGetBooleanv(GL_COLOR_WRITEMASK, &channels[0]);

  red = channels[0], green = channels[1], blue = channels[2],

  alpha = channels[3];

}

//-----------------------------------------------------------------------------

void tglMultColorMask(GLboolean red, GLboolean green, GLboolean blue,

                      GLboolean alpha) {

  GLboolean channels[4];

  glGetBooleanv(GL_COLOR_WRITEMASK, &channels[0]);

  glColorMask(red && channels[0], green && channels[1], blue && channels[2],

              alpha && channels[3]);

}

//============================================================================

namespace {

//============================================================================

class GlFontManager {

  GlFontManager();

public:

  ~GlFontManager();

  static GlFontManager *instance();

  bool setFont(void *font = GLUT_BITMAP_TIMES_ROMAN_10);

  void drawText(/*const TRectD bBox,*/

                std::wstring wtext /*,

                TDimensionD scale = TDimensionD(1.0, 1.0)*/);

private:

  static GlFontManager *m_instance;

  //       font    font_height

  //         |       |

  std::map<void *,="" double=""> m_fonts;</void>

  std::vector<trectd> m_charsBBox;</trectd>

  void *m_currentFont;

  TRaster32P m_fontTexture;

  GLuint m_base;

};

//----------------------------------------------------------------------------

GlFontManager *GlFontManager::m_instance = 0L;

//----------------------------------------------------------------------------

GlFontManager::GlFontManager() : m_currentFont(0L), m_base(0) {

  m_fonts.insert(std::make_pair(GLUT_BITMAP_8_BY_13, 13.0));

  m_fonts.insert(std::make_pair(GLUT_BITMAP_9_BY_15, 15.0));

  m_fonts.insert(std::make_pair(GLUT_BITMAP_TIMES_ROMAN_10, 10.0));

  m_fonts.insert(std::make_pair(GLUT_BITMAP_TIMES_ROMAN_24, 24.0));

  m_fonts.insert(std::make_pair(GLUT_BITMAP_HELVETICA_10, 10.0));

  m_fonts.insert(std::make_pair(GLUT_BITMAP_HELVETICA_12, 12.0));

  m_fonts.insert(std::make_pair(GLUT_BITMAP_HELVETICA_18, 18.0));

  bool ok = setFont();

  assert(ok);

}

//----------------------------------------------------------------------------

GlFontManager::~GlFontManager() { m_instance = 0L; }

//----------------------------------------------------------------------------

GlFontManager *GlFontManager::instance() {

  if (!m_instance) m_instance = new GlFontManager();

  return m_instance;

}

//----------------------------------------------------------------------------

bool GlFontManager::setFont(void *font) {

  // cerca il font scelto nella mappa dei fonts conosciuti

  std::map<void *,="" double="">::iterator it = m_fonts.find(font);</void>

  // se e' stato trovato

  if (it != m_fonts.end()) {

    m_currentFont = font;

    glPushAttrib(GL_ALL_ATTRIB_BITS);

    glPushMatrix();

    m_base = glGenLists(256);

    glListBase(m_base);

    int i = 0;

    for (; i < 256; ++i) {

      glNewList(m_base + i, GL_COMPILE);

      glutStrokeCharacter(GLUT_STROKE_ROMAN, i);

      // glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, i);

      glEndList();

    }

    glPopAttrib();

    glPopMatrix();

    return true;

  }

  return false;

}

//----------------------------------------------------------------------------

void GlFontManager::drawText(/*const TRectD bBox,*/

                             std::wstring wtext /*,

                             TDimensionD scale*/) {

  if (!m_currentFont) return;

  std::string text       = ::to_string(wtext);

  const char *textString = text.c_str();

  glListBase(m_base);

  /*

glPushMatrix();

glTranslated(bBox.x0, bBox.y0, 0.0);

glScaled(scale.lx*0.07, scale.ly*0.07, 1.0);

*/

  glCallLists((GLuint)strlen(textString), GL_BYTE, textString);

  /*glPopMatrix();*/

}

//============================================================================

}  // anonymous namespace

//============================================================================

void tglDraw(const TCubic &cubic, int precision, GLenum pointOrLine) {

  CHECK_ERRORS_BY_GL;

  assert(pointOrLine == GL_POINT || pointOrLine == GL_LINE);

  float ctrlPts[4][3];

  ctrlPts[0][0] = cubic.getP0().x;

  ctrlPts[0][1] = cubic.getP0().y;

  ctrlPts[0][2] = 0.0;

  ctrlPts[1][0] = cubic.getP1().x;

  ctrlPts[1][1] = cubic.getP1().y;

  ctrlPts[1][2] = 0.0;

  ctrlPts[2][0] = cubic.getP2().x;

  ctrlPts[2][1] = cubic.getP2().y;

  ctrlPts[2][2] = 0.0;

  ctrlPts[3][0] = cubic.getP3().x;

  ctrlPts[3][1] = cubic.getP3().y;

  ctrlPts[3][2] = 0.0;

  CHECK_ERRORS_BY_GL;

  glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 4, &ctrlPts[0][0]);

  CHECK_ERRORS_BY_GL;

  glEnable(GL_MAP1_VERTEX_3);

  CHECK_ERRORS_BY_GL;

  glMapGrid1f(precision, 0.0, 1.0);

  CHECK_ERRORS_BY_GL;

  glEvalMesh1(pointOrLine, 0, precision);

  CHECK_ERRORS_BY_GL;

}

//-----------------------------------------------------------------------------

void tglDraw(const TRectD &rect, const std::vector<traster32p> &textures,</traster32p>

             bool blending) {

  double pixelSize2 = tglGetPixelSize2();

  // level e' la minore potenza di 2 maggiore di sqrt(pixelSize2)

  unsigned int level = 1;

  while (pixelSize2 * level * level <= 1.0) level <<= 1;

  unsigned int texturesCount       = (int)textures.size();

  if (level > texturesCount) level = texturesCount;

  level = texturesCount - level;

  tglDraw(rect, textures[level], blending);

}

//-------------------------------------------------------------------

void tglDraw(const TRectD &rect, const TRaster32P &tex, bool blending) {

  CHECK_ERRORS_BY_GL;

  glPushAttrib(GL_ALL_ATTRIB_BITS);

  if (blending) {

    glEnable(GL_BLEND);

    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  }

  unsigned int texWidth  = 1;

  unsigned int texHeight = 1;

  while (texWidth < (unsigned int)tex->getLx()) texWidth = texWidth << 1;

  while (texHeight < (unsigned int)tex->getLy()) texHeight = texHeight << 1;

  double lwTex = 1.0;

  double lhTex = 1.0;

  TRaster32P texture;

  unsigned int texLx = (unsigned int)tex->getLx();

  unsigned int texLy = (unsigned int)tex->getLy();

  if (texWidth != texLx || texHeight != texLy) {

    texture = TRaster32P(texWidth, texHeight);

    texture->fill(TPixel32(0, 0, 0, 0));

    texture->copy(tex);

    lwTex                  = (texLx) / (double)(texWidth);

    lhTex                  = (texLy) / (double)(texHeight);

    if (lwTex > 1.0) lwTex = 1.0;

    if (lhTex > 1.0) lhTex = 1.0;

  } else

    texture = tex;

  GLenum fmt =

#if defined(TNZ_MACHINE_CHANNEL_ORDER_BGRM)

      GL_BGRA_EXT;

#elif defined(TNZ_MACHINE_CHANNEL_ORDER_MBGR)

      GL_ABGR_EXT;

#elif defined(TNZ_MACHINE_CHANNEL_ORDER_RGBM)

      GL_RGBA;

#elif defined(TNZ_MACHINE_CHANNEL_ORDER_MRGB)

      GL_BGRA;

#else

//   Error  PLATFORM NOT SUPPORTED

#error "unknown channel order!"

#endif

  // Generate a texture id and bind it.

  GLuint texId;

  glGenTextures(1, &texId);

  glBindTexture(GL_TEXTURE_2D, texId);

  glPixelStorei(GL_UNPACK_ROW_LENGTH, texture->getWrap());

  texture->lock();

  glTexImage2D(GL_TEXTURE_2D, 0, 4, texWidth, texHeight, 0, fmt,

#ifdef TNZ_MACHINE_CHANNEL_ORDER_MRGB

               GL_UNSIGNED_INT_8_8_8_8_REV,

#else

               GL_UNSIGNED_BYTE,

#endif

               texture->getRawData());

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

  glEnable(GL_TEXTURE_2D);

  glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

  double rectLx = rect.getLx();

  double rectLy = rect.getLy();

  tglColor(TPixel32(0, 0, 0, 0));

  glPushMatrix();

  glTranslated(rect.x0, rect.y0, 0.0);

  glBegin(GL_POLYGON);

  glTexCoord2d(0, 0);

  tglVertex(TPointD(0.0, 0.0));

  glTexCoord2d(lwTex, 0);

  tglVertex(TPointD(rectLx, 0.0));

  glTexCoord2d(lwTex, lhTex);

  tglVertex(TPointD(rectLx, rectLy));

  glTexCoord2d(0, lhTex);

  tglVertex(TPointD(0.0, rectLy));

  glEnd();

  glDisable(GL_TEXTURE_2D);

  glPopMatrix();

  glPopAttrib();

  // Delete texture

  glDeleteTextures(1, &texId);

  texture->unlock();

}

//-----------------------------------------------------------------------------

void tglBuildMipmaps(std::vector<traster32p> &rasters,</traster32p>

                     const TFilePath &filepath) {

  assert(rasters.size() > 0);

  TRop::ResampleFilterType resampleFilter = TRop::ClosestPixel;

  TRasterP ras;

  TImageReader::load(filepath, ras);

  int rasLx = ras->getLx();

  int rasLy = ras->getLy();

  int lx = 1;

  while (lx < rasLx) lx <<= 1;

  int ly = 1;

  while (ly < rasLy) ly <<= 1;

  TRaster32P ras2(lx, ly);

  double sx = (double)lx / (double)ras->getLx();

  double sy = (double)ly / (double)ras->getLy();

#ifndef SCALE_BY_GLU

  TRop::resample(ras2, ras, TScale(sx, sy), resampleFilter);

#else

  ras->lock();

  gluScaleImage(GL_RGBA, ras->getLx(), ras->getLy(), GL_UNSIGNED_BYTE,

                ras->getRawData(), lx, ly, GL_UNSIGNED_BYTE,

                ras2->getRawData());

  ras->unlock();

#endif

  rasters[0] = ras2;

  int ras2Lx = ras2->getLx();

  int ras2Ly = ras2->getLy();

  for (int i = 1; i < (int)rasters.size(); ++i) {

    lx >>= 1;

    ly >>= 1;

    if (lx < 1) lx = 1;

    if (ly < 1) ly = 1;

    rasters[i]     = TRaster32P(lx, ly);

    sx             = (double)lx / (double)ras2Lx;

    sy             = (double)ly / (double)ras2Ly;

    rasters[i]     = TRaster32P(lx, ly);

#ifndef SCALE_BY_GLU

    TRop::resample(rasters[i], ras2, TScale(sx, sy), resampleFilter);

#else

    ras2->lock();

    gluScaleImage(GL_RGBA, ras->getLx(), ras->getLy(), GL_UNSIGNED_BYTE,

                  ras2->getRawData(), lx, ly, GL_UNSIGNED_BYTE,

                  rasters[i]->getRawData());

    ras2->unlock();

#endif

  }

}

//-----------------------------------------------------------------------------

// Forse si potrebbe togliere l'ifdef ed usare QT

#if defined(_WIN32)

TGlContext tglGetCurrentContext() {

  return std::make_pair(wglGetCurrentDC(), wglGetCurrentContext());

}

void tglMakeCurrent(TGlContext context) {

  wglMakeCurrent(context.first, context.second);

}

void tglDoneCurrent(TGlContext) { wglMakeCurrent(NULL, NULL); }

#elif defined(LINUX) || defined(FREEBSD) || defined(__sgi) || defined(MACOSX)

TGlContext tglGetCurrentContext() {

  return reinterpret_cast<tglcontext>(</tglcontext>

      const_cast<qglcontext *="">(QGLContext::currentContext()));</qglcontext>

  // (Daniele) I'm not sure why QGLContext::currentContext() returns

  // const. I think it shouldn't, and guess (hope) this is safe...

}

void tglMakeCurrent(TGlContext context) {

  if (context)

    reinterpret_cast<qglcontext *="">(context)->makeCurrent();</qglcontext>

  else

    tglDoneCurrent(tglGetCurrentContext());

}

void tglDoneCurrent(TGlContext context) {

  if (context) reinterpret_cast<qglcontext *="">(context)->doneCurrent();</qglcontext>

}

#else

#error "unknown platform!"

#endif

//-----------------------------------------------------------------------------

//  End Of File

//-----------------------------------------------------------------------------