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1 | // Created on: 2013-01-29 |
2 | // Created by: Kirill GAVRILOV |
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3 | // Copyright (c) 2013-2014 OPEN CASCADE SAS |
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4 | // |
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5 | // This file is part of Open CASCADE Technology software library. |
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6 | // |
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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 |
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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. |
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12 | // |
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13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
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15 | |
16 | #include <OpenGl_Font.hxx> |
17 | |
18 | #include <OpenGl_Context.hxx> |
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19 | #include <Font_FTFont.hxx> |
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20 | #include <Graphic3d_TextureParams.hxx> |
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21 | #include <Standard_Assert.hxx> |
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22 | #include <TCollection_ExtendedString.hxx> |
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23 | |
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24 | |
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25 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_Font,OpenGl_Resource) |
26 | |
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27 | // ======================================================================= |
28 | // function : OpenGl_Font |
29 | // purpose : |
30 | // ======================================================================= |
31 | OpenGl_Font::OpenGl_Font (const Handle(Font_FTFont)& theFont, |
32 | const TCollection_AsciiString& theKey) |
33 | : myKey (theKey), |
34 | myFont (theFont), |
35 | myAscender (0.0f), |
36 | myDescender (0.0f), |
37 | myLineSpacing (0.0f), |
38 | myTileSizeX (0), |
39 | myTileSizeY (0), |
40 | myLastTileId (-1), |
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41 | myTextureFormat (GL_ALPHA) |
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42 | { |
43 | memset (&myLastTilePx, 0, sizeof(myLastTilePx)); |
44 | } |
45 | |
46 | // ======================================================================= |
47 | // function : ~OpenGl_Font |
48 | // purpose : |
49 | // ======================================================================= |
50 | OpenGl_Font::~OpenGl_Font() |
51 | { |
52 | Release (NULL); |
53 | } |
54 | |
55 | // ======================================================================= |
56 | // function : Release |
57 | // purpose : |
58 | // ======================================================================= |
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59 | void OpenGl_Font::Release (OpenGl_Context* theCtx) |
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60 | { |
61 | if (myTextures.IsEmpty()) |
62 | { |
63 | return; |
64 | } |
65 | |
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66 | for (Standard_Integer anIter = 0; anIter < myTextures.Length(); ++anIter) |
67 | { |
68 | Handle(OpenGl_Texture)& aTexture = myTextures.ChangeValue (anIter); |
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69 | if (aTexture->IsValid()) |
70 | { |
71 | // application can not handle this case by exception - this is bug in code |
72 | Standard_ASSERT_RETURN (theCtx != NULL, |
73 | "OpenGl_Font destroyed without GL context! Possible GPU memory leakage...",); |
74 | } |
75 | |
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76 | aTexture->Release (theCtx); |
77 | aTexture.Nullify(); |
78 | } |
79 | myTextures.Clear(); |
80 | } |
81 | |
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82 | // ======================================================================= |
83 | // function : EstimatedDataSize |
84 | // purpose : |
85 | // ======================================================================= |
86 | Standard_Size OpenGl_Font::EstimatedDataSize() const |
87 | { |
88 | Standard_Size aSize = 0; |
89 | for (NCollection_Vector<Handle(OpenGl_Texture)>::Iterator aTexIter (myTextures); aTexIter.More(); aTexIter.Next()) |
90 | { |
91 | aSize += aTexIter.Value()->EstimatedDataSize(); |
92 | } |
93 | return aSize; |
94 | } |
95 | |
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96 | // ======================================================================= |
97 | // function : Init |
98 | // purpose : |
99 | // ======================================================================= |
100 | bool OpenGl_Font::Init (const Handle(OpenGl_Context)& theCtx) |
101 | { |
102 | Release (theCtx.operator->()); |
103 | if (myFont.IsNull() || !myFont->IsValid()) |
104 | { |
105 | return false; |
106 | } |
107 | |
108 | myAscender = myFont->Ascender(); |
109 | myDescender = myFont->Descender(); |
110 | myLineSpacing = myFont->LineSpacing(); |
111 | myTileSizeX = myFont->GlyphMaxSizeX(); |
112 | myTileSizeY = myFont->GlyphMaxSizeY(); |
113 | |
114 | myLastTileId = -1; |
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115 | if (!createTexture (theCtx)) |
116 | { |
117 | Release (theCtx.operator->()); |
118 | return false; |
119 | } |
120 | return true; |
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121 | } |
122 | |
123 | // ======================================================================= |
124 | // function : createTexture |
125 | // purpose : |
126 | // ======================================================================= |
127 | bool OpenGl_Font::createTexture (const Handle(OpenGl_Context)& theCtx) |
128 | { |
129 | const Standard_Integer aMaxSize = theCtx->MaxTextureSize(); |
130 | |
131 | Standard_Integer aGlyphsNb = myFont->GlyphsNumber() - myLastTileId + 1; |
132 | |
133 | const Standard_Integer aTextureSizeX = OpenGl_Context::GetPowerOfTwo (aGlyphsNb * myTileSizeX, aMaxSize); |
134 | const Standard_Integer aTilesPerRow = aTextureSizeX / myTileSizeX; |
135 | const Standard_Integer aTextureSizeY = OpenGl_Context::GetPowerOfTwo (GLint((aGlyphsNb / aTilesPerRow) + 1) * myTileSizeY, aMaxSize); |
136 | |
137 | memset (&myLastTilePx, 0, sizeof(myLastTilePx)); |
138 | myLastTilePx.Bottom = myTileSizeY; |
139 | |
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140 | Handle(Graphic3d_TextureParams) aParams = new Graphic3d_TextureParams(); |
141 | aParams->SetModulate (Standard_False); |
142 | aParams->SetRepeat (Standard_False); |
143 | aParams->SetFilter (Graphic3d_TOTF_BILINEAR); |
144 | aParams->SetAnisoFilter (Graphic3d_LOTA_OFF); |
145 | |
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146 | myTextures.Append (new OpenGl_Texture (myKey + "_texture" + myTextures.Size(), aParams)); |
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147 | Handle(OpenGl_Texture)& aTexture = myTextures.ChangeLast(); |
148 | |
149 | Image_PixMap aBlackImg; |
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150 | if (!aBlackImg.InitZero (Image_Format_Alpha, Standard_Size(aTextureSizeX), Standard_Size(aTextureSizeY)) |
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151 | || !aTexture->Init (theCtx, aBlackImg, Graphic3d_TOT_2D)) // myTextureFormat |
152 | { |
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153 | TCollection_ExtendedString aMsg; |
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154 | aMsg += "New texture initialization of size "; |
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155 | aMsg += aTextureSizeX; |
156 | aMsg += "x"; |
157 | aMsg += aTextureSizeY; |
158 | aMsg += " for textured font has failed."; |
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159 | theCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION, GL_DEBUG_TYPE_ERROR, 0, GL_DEBUG_SEVERITY_HIGH, aMsg); |
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160 | return false; |
161 | } |
162 | |
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163 | return true; |
164 | } |
165 | |
166 | // ======================================================================= |
167 | // function : renderGlyph |
168 | // purpose : |
169 | // ======================================================================= |
170 | bool OpenGl_Font::renderGlyph (const Handle(OpenGl_Context)& theCtx, |
171 | const Standard_Utf32Char theChar) |
172 | { |
173 | if (!myFont->RenderGlyph (theChar)) |
174 | { |
175 | return false; |
176 | } |
177 | |
178 | Handle(OpenGl_Texture)& aTexture = myTextures.ChangeLast(); |
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179 | if (aTexture.IsNull() |
180 | || !aTexture->IsValid()) |
181 | { |
182 | return false; |
183 | } |
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184 | |
185 | const Image_PixMap& anImg = myFont->GlyphImage(); |
186 | const Standard_Integer aTileId = myLastTileId + 1; |
187 | myLastTilePx.Left = myLastTilePx.Right + 3; |
188 | myLastTilePx.Right = myLastTilePx.Left + (Standard_Integer )anImg.SizeX(); |
189 | if (myLastTilePx.Right >= aTexture->SizeX()) |
190 | { |
191 | myLastTilePx.Left = 0; |
192 | myLastTilePx.Right = (Standard_Integer )anImg.SizeX(); |
193 | myLastTilePx.Top += myTileSizeY; |
194 | myLastTilePx.Bottom += myTileSizeY; |
195 | |
196 | if (myLastTilePx.Bottom >= aTexture->SizeY()) |
197 | { |
198 | if (!createTexture (theCtx)) |
199 | { |
200 | return false; |
201 | } |
202 | return renderGlyph (theCtx, theChar); |
203 | } |
204 | } |
205 | |
206 | aTexture->Bind (theCtx); |
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207 | #if !defined(GL_ES_VERSION_2_0) |
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208 | glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE); |
209 | glPixelStorei (GL_UNPACK_ROW_LENGTH, 0); |
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210 | #endif |
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211 | glPixelStorei (GL_UNPACK_ALIGNMENT, 1); |
212 | |
213 | glTexSubImage2D (GL_TEXTURE_2D, 0, |
214 | myLastTilePx.Left, myLastTilePx.Top, (GLsizei )anImg.SizeX(), (GLsizei )anImg.SizeY(), |
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215 | aTexture->GetFormat(), GL_UNSIGNED_BYTE, anImg.Data()); |
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216 | |
217 | OpenGl_Font::Tile aTile; |
218 | aTile.uv.Left = GLfloat(myLastTilePx.Left) / GLfloat(aTexture->SizeX()); |
219 | aTile.uv.Right = GLfloat(myLastTilePx.Right) / GLfloat(aTexture->SizeX()); |
220 | aTile.uv.Top = GLfloat(myLastTilePx.Top) / GLfloat(aTexture->SizeY()); |
221 | aTile.uv.Bottom = GLfloat(myLastTilePx.Top + anImg.SizeY()) / GLfloat(aTexture->SizeY()); |
222 | aTile.texture = aTexture->TextureId(); |
223 | myFont->GlyphRect (aTile.px); |
224 | |
225 | myLastTileId = aTileId; |
226 | myTiles.Append (aTile); |
227 | return true; |
228 | } |
229 | |
230 | // ======================================================================= |
231 | // function : RenderGlyph |
232 | // purpose : |
233 | // ======================================================================= |
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234 | bool OpenGl_Font::RenderGlyph (const Handle(OpenGl_Context)& theCtx, |
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235 | const Standard_Utf32Char theUChar, |
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236 | Tile& theGlyph) |
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237 | { |
238 | Standard_Integer aTileId = 0; |
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239 | if (!myGlyphMap.Find (theUChar,aTileId)) |
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240 | { |
241 | if (renderGlyph (theCtx, theUChar)) |
242 | { |
243 | aTileId = myLastTileId; |
244 | } |
245 | else |
246 | { |
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247 | return false; |
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248 | } |
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249 | |
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250 | myGlyphMap.Bind (theUChar, aTileId); |
251 | } |
252 | |
253 | const OpenGl_Font::Tile& aTile = myTiles.Value (aTileId); |
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254 | theGlyph.px = aTile.px; |
255 | theGlyph.uv = aTile.uv; |
256 | theGlyph.texture = aTile.texture; |
257 | |
258 | return true; |
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259 | } |