Corrected integration for issue 26393
[occt.git] / src / OpenGl / OpenGl_Font.cxx
CommitLineData
a174a3c5 1// Created on: 2013-01-29
2// Created by: Kirill GAVRILOV
d5f74e42 3// Copyright (c) 2013-2014 OPEN CASCADE SAS
a174a3c5 4//
973c2be1 5// This file is part of Open CASCADE Technology software library.
a174a3c5 6//
d5f74e42 7// This library is free software; you can redistribute it and/or modify it under
8// the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1 9// by the Free Software Foundation, with special exception defined in the file
10// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11// distribution for complete text of the license and disclaimer of any warranty.
a174a3c5 12//
973c2be1 13// Alternatively, this file may be used under the terms of Open CASCADE
14// commercial license or contractual agreement.
a174a3c5 15
16#include <OpenGl_Font.hxx>
17
18#include <OpenGl_Context.hxx>
fe3a29bc 19#include <Graphic3d_TextureParams.hxx>
a174a3c5 20#include <Standard_Assert.hxx>
cbf18624 21#include <TCollection_ExtendedString.hxx>
a174a3c5 22
a174a3c5 23
24// =======================================================================
25// function : OpenGl_Font
26// purpose :
27// =======================================================================
28OpenGl_Font::OpenGl_Font (const Handle(Font_FTFont)& theFont,
29 const TCollection_AsciiString& theKey)
30: myKey (theKey),
31 myFont (theFont),
32 myAscender (0.0f),
33 myDescender (0.0f),
34 myLineSpacing (0.0f),
35 myTileSizeX (0),
36 myTileSizeY (0),
37 myLastTileId (-1),
ca3c13d1 38 myTextureFormat (GL_ALPHA)
a174a3c5 39{
40 memset (&myLastTilePx, 0, sizeof(myLastTilePx));
41}
42
43// =======================================================================
44// function : ~OpenGl_Font
45// purpose :
46// =======================================================================
47OpenGl_Font::~OpenGl_Font()
48{
49 Release (NULL);
50}
51
52// =======================================================================
53// function : Release
54// purpose :
55// =======================================================================
10b9c7df 56void OpenGl_Font::Release (OpenGl_Context* theCtx)
a174a3c5 57{
58 if (myTextures.IsEmpty())
59 {
60 return;
61 }
62
a174a3c5 63 for (Standard_Integer anIter = 0; anIter < myTextures.Length(); ++anIter)
64 {
65 Handle(OpenGl_Texture)& aTexture = myTextures.ChangeValue (anIter);
c6ad5e5f 66 if (aTexture->IsValid())
67 {
68 // application can not handle this case by exception - this is bug in code
69 Standard_ASSERT_RETURN (theCtx != NULL,
70 "OpenGl_Font destroyed without GL context! Possible GPU memory leakage...",);
71 }
72
a174a3c5 73 aTexture->Release (theCtx);
74 aTexture.Nullify();
75 }
76 myTextures.Clear();
77}
78
79// =======================================================================
80// function : Init
81// purpose :
82// =======================================================================
83bool OpenGl_Font::Init (const Handle(OpenGl_Context)& theCtx)
84{
85 Release (theCtx.operator->());
86 if (myFont.IsNull() || !myFont->IsValid())
87 {
88 return false;
89 }
90
91 myAscender = myFont->Ascender();
92 myDescender = myFont->Descender();
93 myLineSpacing = myFont->LineSpacing();
94 myTileSizeX = myFont->GlyphMaxSizeX();
95 myTileSizeY = myFont->GlyphMaxSizeY();
96
97 myLastTileId = -1;
c6ad5e5f 98 if (!createTexture (theCtx))
99 {
100 Release (theCtx.operator->());
101 return false;
102 }
103 return true;
a174a3c5 104}
105
106// =======================================================================
107// function : createTexture
108// purpose :
109// =======================================================================
110bool OpenGl_Font::createTexture (const Handle(OpenGl_Context)& theCtx)
111{
112 const Standard_Integer aMaxSize = theCtx->MaxTextureSize();
113
114 Standard_Integer aGlyphsNb = myFont->GlyphsNumber() - myLastTileId + 1;
115
116 const Standard_Integer aTextureSizeX = OpenGl_Context::GetPowerOfTwo (aGlyphsNb * myTileSizeX, aMaxSize);
117 const Standard_Integer aTilesPerRow = aTextureSizeX / myTileSizeX;
118 const Standard_Integer aTextureSizeY = OpenGl_Context::GetPowerOfTwo (GLint((aGlyphsNb / aTilesPerRow) + 1) * myTileSizeY, aMaxSize);
119
120 memset (&myLastTilePx, 0, sizeof(myLastTilePx));
121 myLastTilePx.Bottom = myTileSizeY;
122
fe3a29bc 123 Handle(Graphic3d_TextureParams) aParams = new Graphic3d_TextureParams();
124 aParams->SetModulate (Standard_False);
125 aParams->SetRepeat (Standard_False);
126 aParams->SetFilter (Graphic3d_TOTF_BILINEAR);
127 aParams->SetAnisoFilter (Graphic3d_LOTA_OFF);
128
129 myTextures.Append (new OpenGl_Texture (aParams));
a174a3c5 130 Handle(OpenGl_Texture)& aTexture = myTextures.ChangeLast();
131
132 Image_PixMap aBlackImg;
076ca35c 133 if (!aBlackImg.InitZero (Image_PixMap::ImgAlpha, Standard_Size(aTextureSizeX), Standard_Size(aTextureSizeY))
a174a3c5 134 || !aTexture->Init (theCtx, aBlackImg, Graphic3d_TOT_2D)) // myTextureFormat
135 {
cbf18624 136 TCollection_ExtendedString aMsg;
137 aMsg += "New texture intialization of size ";
138 aMsg += aTextureSizeX;
139 aMsg += "x";
140 aMsg += aTextureSizeY;
141 aMsg += " for textured font has failed.";
142 theCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION_ARB, GL_DEBUG_TYPE_ERROR_ARB, 0, GL_DEBUG_SEVERITY_HIGH_ARB, aMsg);
a174a3c5 143 return false;
144 }
145
a174a3c5 146 return true;
147}
148
149// =======================================================================
150// function : renderGlyph
151// purpose :
152// =======================================================================
153bool OpenGl_Font::renderGlyph (const Handle(OpenGl_Context)& theCtx,
154 const Standard_Utf32Char theChar)
155{
156 if (!myFont->RenderGlyph (theChar))
157 {
158 return false;
159 }
160
161 Handle(OpenGl_Texture)& aTexture = myTextures.ChangeLast();
c6ad5e5f 162 if (aTexture.IsNull()
163 || !aTexture->IsValid())
164 {
165 return false;
166 }
a174a3c5 167
168 const Image_PixMap& anImg = myFont->GlyphImage();
169 const Standard_Integer aTileId = myLastTileId + 1;
170 myLastTilePx.Left = myLastTilePx.Right + 3;
171 myLastTilePx.Right = myLastTilePx.Left + (Standard_Integer )anImg.SizeX();
172 if (myLastTilePx.Right >= aTexture->SizeX())
173 {
174 myLastTilePx.Left = 0;
175 myLastTilePx.Right = (Standard_Integer )anImg.SizeX();
176 myLastTilePx.Top += myTileSizeY;
177 myLastTilePx.Bottom += myTileSizeY;
178
179 if (myLastTilePx.Bottom >= aTexture->SizeY())
180 {
181 if (!createTexture (theCtx))
182 {
183 return false;
184 }
185 return renderGlyph (theCtx, theChar);
186 }
187 }
188
189 aTexture->Bind (theCtx);
ca3c13d1 190#if !defined(GL_ES_VERSION_2_0)
a174a3c5 191 glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
192 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
ca3c13d1 193#endif
a174a3c5 194 glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
195
196 glTexSubImage2D (GL_TEXTURE_2D, 0,
197 myLastTilePx.Left, myLastTilePx.Top, (GLsizei )anImg.SizeX(), (GLsizei )anImg.SizeY(),
c6ad5e5f 198 aTexture->GetFormat(), GL_UNSIGNED_BYTE, anImg.Data());
a174a3c5 199
200 OpenGl_Font::Tile aTile;
201 aTile.uv.Left = GLfloat(myLastTilePx.Left) / GLfloat(aTexture->SizeX());
202 aTile.uv.Right = GLfloat(myLastTilePx.Right) / GLfloat(aTexture->SizeX());
203 aTile.uv.Top = GLfloat(myLastTilePx.Top) / GLfloat(aTexture->SizeY());
204 aTile.uv.Bottom = GLfloat(myLastTilePx.Top + anImg.SizeY()) / GLfloat(aTexture->SizeY());
205 aTile.texture = aTexture->TextureId();
206 myFont->GlyphRect (aTile.px);
207
208 myLastTileId = aTileId;
209 myTiles.Append (aTile);
210 return true;
211}
212
213// =======================================================================
214// function : RenderGlyph
215// purpose :
216// =======================================================================
217void OpenGl_Font::RenderGlyph (const Handle(OpenGl_Context)& theCtx,
218 const Standard_Utf32Char theUChar,
219 const Standard_Utf32Char theUCharNext,
220 OpenGl_Font::Tile& theGlyph,
221 OpenGl_Vec2& thePen)
222{
223 Standard_Integer aTileId = 0;
224 if (!myGlyphMap.Find (theUChar, aTileId))
225 {
226 if (renderGlyph (theCtx, theUChar))
227 {
228 aTileId = myLastTileId;
229 }
230 else
231 {
232 thePen.x() += myFont->AdvanceX (theUChar, theUCharNext);
233 return;
234 }
235 myGlyphMap.Bind (theUChar, aTileId);
236 }
237
238 const OpenGl_Font::Tile& aTile = myTiles.Value (aTileId);
239 theGlyph.px.Top = thePen.y() + aTile.px.Top;
240 theGlyph.px.Bottom = thePen.y() + aTile.px.Bottom;
241 theGlyph.px.Left = thePen.x() + aTile.px.Left;
242 theGlyph.px.Right = thePen.x() + aTile.px.Right;
243 theGlyph.uv = aTile.uv;
244 theGlyph.texture = aTile.texture;
245
246 thePen.x() += myFont->AdvanceX (theUChar, theUCharNext);
247}