glcanvas.cpp

A*算法 A*算法 A*算法 A*算法A*算法A*算法

          }
          arg++;
          break;
        case WX_GL_DOUBLEBUFFER:
          pfd.dwFlags |= PFD_DOUBLEBUFFER;
          break;
        case WX_GL_STEREO:
          pfd.dwFlags |= PFD_STEREO;
          break;
        case WX_GL_AUX_BUFFERS:
          pfd.cAuxBuffers = (BYTE)attribList[arg++];
          break;
        case WX_GL_MIN_RED:
          pfd.cColorBits = (BYTE)(pfd.cColorBits + (pfd.cRedBits = (BYTE)attribList[arg++]));
          break;
        case WX_GL_MIN_GREEN:
          pfd.cColorBits = (BYTE)(pfd.cColorBits + (pfd.cGreenBits = (BYTE)attribList[arg++]));
          break;
        case WX_GL_MIN_BLUE:
          pfd.cColorBits = (BYTE)(pfd.cColorBits + (pfd.cBlueBits = (BYTE)attribList[arg++]));
          break;
        case WX_GL_MIN_ALPHA:
          // doesn't count in cColorBits
          pfd.cAlphaBits = (BYTE)attribList[arg++];
          break;
        case WX_GL_DEPTH_SIZE:
          pfd.cDepthBits = (BYTE)attribList[arg++];
          break;
        case WX_GL_STENCIL_SIZE:
          pfd.cStencilBits = (BYTE)attribList[arg++];
          break;
        case WX_GL_MIN_ACCUM_RED:
          pfd.cAccumBits = (BYTE)(pfd.cAccumBits + (pfd.cAccumRedBits = (BYTE)attribList[arg++]));
          break;
        case WX_GL_MIN_ACCUM_GREEN:
          pfd.cAccumBits = (BYTE)(pfd.cAccumBits + (pfd.cAccumGreenBits = (BYTE)attribList[arg++]));
          break;
        case WX_GL_MIN_ACCUM_BLUE:
          pfd.cAccumBits = (BYTE)(pfd.cAccumBits + (pfd.cAccumBlueBits = (BYTE)attribList[arg++]));
          break;
        case WX_GL_MIN_ACCUM_ALPHA:
          pfd.cAccumBits = (BYTE)(pfd.cAccumBits + (pfd.cAccumAlphaBits = (BYTE)attribList[arg++]));
          break;
        default:
          break;
      }
    }
  }
}

void wxGLCanvas::SetupPixelFormat(int *attribList, int pixelFormat) // (HDC hDC)
{
  PIXELFORMATDESCRIPTOR pfd = {
        sizeof(PIXELFORMATDESCRIPTOR),    /* size */
        1,                /* version */
        PFD_SUPPORT_OPENGL |
        PFD_DRAW_TO_WINDOW |
        PFD_DOUBLEBUFFER,        /* support double-buffering */
        PFD_TYPE_RGBA,            /* color type */
        16,                /* preferred color depth */
        0, 0, 0, 0, 0, 0,        /* color bits (ignored) */
        0,                /* no alpha buffer */
        0,                /* alpha bits (ignored) */
        0,                /* no accumulation buffer */
        0, 0, 0, 0,            /* accum bits (ignored) */
        16,                /* depth buffer */
        0,                /* no stencil buffer */
        0,                /* no auxiliary buffers */
        PFD_MAIN_PLANE,            /* main layer */
        0,                /* reserved */
        0, 0, 0,            /* no layer, visible, damage masks */
    };

  AdjustPFDForAttributes(pfd, attribList);

  if (pixelFormat == 0) {
	int pixelFormat = ChoosePixelFormat((HDC) m_hDC, &pfd);
	if (pixelFormat == 0) {
		wxLogLastError(_T("ChoosePixelFormat"));
	} else {
		if ( !::SetPixelFormat((HDC) m_hDC, pixelFormat, &pfd) ) {
			wxLogLastError(_T("SetPixelFormat"));
		}
	}
  } else { /* We've already got our pixel format, apply it. */
	if ( !::SetPixelFormat((HDC) m_hDC, pixelFormat, &pfd) ) {
		wxLogLastError(_T("SetPixelFormat"));
	}
  }
}

void wxGLCanvas::SetupPalette(const wxPalette& palette)
{
    int pixelFormat = GetPixelFormat((HDC) m_hDC);
    PIXELFORMATDESCRIPTOR pfd;

    DescribePixelFormat((HDC) m_hDC, pixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);

    if (pfd.dwFlags & PFD_NEED_PALETTE)
    {
    }
    else
    {
      return;
    }

    m_palette = palette;

    if ( !m_palette.Ok() )
    {
        m_palette = CreateDefaultPalette();
    }

    if (m_palette.Ok())
    {
        ::SelectPalette((HDC) m_hDC, (HPALETTE) m_palette.GetHPALETTE(), FALSE);
        ::RealizePalette((HDC) m_hDC);
    }
}

wxPalette wxGLCanvas::CreateDefaultPalette()
{
    PIXELFORMATDESCRIPTOR pfd;
    int paletteSize;
    int pixelFormat = GetPixelFormat((HDC) m_hDC);

    DescribePixelFormat((HDC) m_hDC, pixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);

    paletteSize = 1 << pfd.cColorBits;

    LOGPALETTE* pPal =
     (LOGPALETTE*) malloc(sizeof(LOGPALETTE) + paletteSize * sizeof(PALETTEENTRY));
    pPal->palVersion = 0x300;
    pPal->palNumEntries = (WORD)paletteSize;

    /* build a simple RGB color palette */
    {
    int redMask = (1 << pfd.cRedBits) - 1;
    int greenMask = (1 << pfd.cGreenBits) - 1;
    int blueMask = (1 << pfd.cBlueBits) - 1;
    int i;

    for (i=0; i<paletteSize; ++i) {
        pPal->palPalEntry[i].peRed =
            (BYTE)((((i >> pfd.cRedShift) & redMask) * 255) / redMask);
        pPal->palPalEntry[i].peGreen =
            (BYTE)((((i >> pfd.cGreenShift) & greenMask) * 255) / greenMask);
        pPal->palPalEntry[i].peBlue =
            (BYTE)((((i >> pfd.cBlueShift) & blueMask) * 255) / blueMask);
        pPal->palPalEntry[i].peFlags = 0;
    }
    }

    HPALETTE hPalette = CreatePalette(pPal);
    free(pPal);

    wxPalette palette;
    palette.SetHPALETTE((WXHPALETTE) hPalette);

    return palette;
}

void wxGLCanvas::SwapBuffers()
{
  if (m_glContext)
    m_glContext->SwapBuffers();
}

void wxGLCanvas::OnSize(wxSizeEvent& WXUNUSED(event))
{
}

void wxGLCanvas::SetCurrent()
{
  // although on MSW it works even if the window is still hidden, it doesn't
  // under wxGTK and documentation mentions that SetCurrent() can only be
  // called for a shown window, so check it
  wxASSERT_MSG( GetParent()->IsShown(),
                    _T("can't make hidden GL canvas current") );

  if (m_glContext)
  {
    m_glContext->SetCurrent();
  }
}

void wxGLCanvas::SetColour(const wxChar *colour)
{
  if (m_glContext)
    m_glContext->SetColour(colour);
}

// TODO: Have to have this called by parent frame (?)
// So we need wxFrame to call OnQueryNewPalette for all children...
void wxGLCanvas::OnQueryNewPalette(wxQueryNewPaletteEvent& event)
{
  /* realize palette if this is the current window */
  if ( GetPalette()->Ok() ) {
    ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE());
    ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE);
    ::RealizePalette((HDC) GetHDC());
    Refresh();
    event.SetPaletteRealized(true);
  }
  else
    event.SetPaletteRealized(false);
}

// I think this doesn't have to be propagated to child windows.
void wxGLCanvas::OnPaletteChanged(wxPaletteChangedEvent& event)
{
  /* realize palette if this is *not* the current window */
  if ( GetPalette() &&
       GetPalette()->Ok() && (this != event.GetChangedWindow()) )
  {
    ::UnrealizeObject((HPALETTE) GetPalette()->GetHPALETTE());
    ::SelectPalette((HDC) GetHDC(), (HPALETTE) GetPalette()->GetHPALETTE(), FALSE);
    ::RealizePalette((HDC) GetHDC());
    Refresh();
  }
}

/* Give extensions proper function names. */

/* EXT_vertex_array */
void glArrayElementEXT(GLint WXUNUSED(i))
{
}

void glColorPointerEXT(GLint WXUNUSED(size), GLenum WXUNUSED(type), GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLvoid *WXUNUSED(pointer))
{
}

void glDrawArraysEXT(GLenum  WXUNUSED_WITHOUT_GL_EXT_vertex_array(mode),
                     GLint   WXUNUSED_WITHOUT_GL_EXT_vertex_array(first),
                     GLsizei WXUNUSED_WITHOUT_GL_EXT_vertex_array(count))
{
#ifdef GL_EXT_vertex_array
    static PFNGLDRAWARRAYSEXTPROC proc = 0;

    if ( !proc )
    {
        proc = (PFNGLDRAWARRAYSEXTPROC) wglGetProcAddress("glDrawArraysEXT");
    }

    if ( proc )
        (* proc) (mode, first, count);
#endif
}

void glEdgeFlagPointerEXT(GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLboolean *WXUNUSED(pointer))
{
}

void glGetPointervEXT(GLenum WXUNUSED(pname), GLvoid* *WXUNUSED(params))
{
}

void glIndexPointerEXT(GLenum WXUNUSED(type), GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLvoid *WXUNUSED(pointer))
{
}

void glNormalPointerEXT(GLenum        WXUNUSED_WITHOUT_GL_EXT_vertex_array(type),
                        GLsizei       WXUNUSED_WITHOUT_GL_EXT_vertex_array(stride),
                        GLsizei       WXUNUSED_WITHOUT_GL_EXT_vertex_array(count),
                        const GLvoid *WXUNUSED_WITHOUT_GL_EXT_vertex_array(pointer))
{
#ifdef GL_EXT_vertex_array
  static PFNGLNORMALPOINTEREXTPROC proc = 0;

  if ( !proc )
  {
    proc = (PFNGLNORMALPOINTEREXTPROC) wglGetProcAddress("glNormalPointerEXT");
  }

  if ( proc )
    (* proc) (type, stride, count, pointer);
#endif
}

void glTexCoordPointerEXT(GLint WXUNUSED(size), GLenum WXUNUSED(type), GLsizei WXUNUSED(stride), GLsizei WXUNUSED(count), const GLvoid *WXUNUSED(pointer))
{
}

void glVertexPointerEXT(GLint         WXUNUSED_WITHOUT_GL_EXT_vertex_array(size),
                        GLenum        WXUNUSED_WITHOUT_GL_EXT_vertex_array(type),
                        GLsizei       WXUNUSED_WITHOUT_GL_EXT_vertex_array(stride),
                        GLsizei       WXUNUSED_WITHOUT_GL_EXT_vertex_array(count),
                        const GLvoid *WXUNUSED_WITHOUT_GL_EXT_vertex_array(pointer))
{
#ifdef GL_EXT_vertex_array
  static PFNGLVERTEXPOINTEREXTPROC proc = 0;

  if ( !proc )
  {
    proc = (PFNGLVERTEXPOINTEREXTPROC) wglGetProcAddress("glVertexPointerEXT");
  }
  if ( proc )
    (* proc) (size, type, stride, count, pointer);
#endif
}

/* EXT_color_subtable */
void glColorSubtableEXT(GLenum WXUNUSED(target), GLsizei WXUNUSED(start), GLsizei WXUNUSED(count), GLenum WXUNUSED(format), GLenum WXUNUSED(type), const GLvoid *WXUNUSED(table))
{
}

/* EXT_color_table */
void glColorTableEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(internalformat), GLsizei WXUNUSED(width), GLenum WXUNUSED(format), GLenum WXUNUSED(type), const GLvoid *WXUNUSED(table))
{
}

void glCopyColorTableEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(internalformat), GLint WXUNUSED(x), GLint WXUNUSED(y), GLsizei WXUNUSED(width))
{
}

void glGetColorTableEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(format), GLenum WXUNUSED(type), GLvoid *WXUNUSED(table))
{
}

void glGetColorTableParamaterfvEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(pname), GLfloat *WXUNUSED(params))
{
}

void glGetColorTavleParameterivEXT(GLenum WXUNUSED(target), GLenum WXUNUSED(pname), GLint *WXUNUSED(params))
{
}

/* SGI_compiled_vertex_array */
void glLockArraysSGI(GLint WXUNUSED(first), GLsizei WXUNUSED(count))
{
}

void glUnlockArraysSGI()
{
}


/* SGI_cull_vertex */
void glCullParameterdvSGI(GLenum WXUNUSED(pname), GLdouble* WXUNUSED(params))
{
}

void glCullParameterfvSGI(GLenum WXUNUSED(pname), GLfloat* WXUNUSED(params))
{
}

/* SGI_index_func */
void glIndexFuncSGI(GLenum WXUNUSED(func), GLclampf WXUNUSED(ref))
{
}

/* SGI_index_material */
void glIndexMaterialSGI(GLenum WXUNUSED(face), GLenum WXUNUSED(mode))
{
}

/* WIN_swap_hint */
void glAddSwapHintRectWin(GLint WXUNUSED(x), GLint WXUNUSED(y), GLsizei WXUNUSED(width), GLsizei WXUNUSED(height))
{
}


//---------------------------------------------------------------------------
// wxGLApp
//---------------------------------------------------------------------------

IMPLEMENT_CLASS(wxGLApp, wxApp)

bool wxGLApp::InitGLVisual(int *attribList)
{
  int pixelFormat;
  PIXELFORMATDESCRIPTOR pfd = {
        sizeof(PIXELFORMATDESCRIPTOR),    /* size */
        1,                /* version */
        PFD_SUPPORT_OPENGL |
        PFD_DRAW_TO_WINDOW |
        PFD_DOUBLEBUFFER,        /* support double-buffering */
        PFD_TYPE_RGBA,            /* color type */
        32,                /* preferred color depth */
        0, 0, 0, 0, 0, 0,        /* color bits (ignored) */
        0,                /* no alpha buffer */
        0,                /* alpha bits (ignored) */
        0,                /* no accumulation buffer */
        0, 0, 0, 0,            /* accum bits (ignored) */
        24,                /* depth buffer */
        0,                /* no stencil buffer */
        0,                /* no auxiliary buffers */
        PFD_MAIN_PLANE,            /* main layer */
        0,                /* reserved */
        0, 0, 0,            /* no layer, visible, damage masks */
    };

  AdjustPFDForAttributes(pfd, attribList);

  // use DC for whole (root) screen, since no windows have yet been created
  pixelFormat = ChoosePixelFormat(ScreenHDC(), &pfd);

  if (pixelFormat == 0) {
    wxLogError(_("Failed to initialize OpenGL"));
    return false;
  }

  return true;
}

wxGLApp::~wxGLApp()
{
}

#endif
    // wxUSE_GLCANVAS