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<h1>FTGLTextureFont.cpp</h1><a href="FTGLTextureFont_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include <string></span> <span class="comment">// For memset</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="preprocessor">#include "FTGLTextureFont.h"</span>
<a name="l00004"></a>00004 <span class="preprocessor">#include "FTTextureGlyph.h"</span>
<a name="l00005"></a>00005
<a name="l00006"></a>00006
<a name="l00007"></a><a class="code" href="FTGLTextureFont_8cpp.html#cebec7d37f54b765683c095786dfa2d6">00007</a> <span class="keyword">inline</span> GLuint <a class="code" href="FTGLTextureFont_8cpp.html#cebec7d37f54b765683c095786dfa2d6">NextPowerOf2</a>( GLuint in)
<a name="l00008"></a>00008 {
<a name="l00009"></a>00009 in -= 1;
<a name="l00010"></a>00010
<a name="l00011"></a>00011 in |= in >> 16;
<a name="l00012"></a>00012 in |= in >> 8;
<a name="l00013"></a>00013 in |= in >> 4;
<a name="l00014"></a>00014 in |= in >> 2;
<a name="l00015"></a>00015 in |= in >> 1;
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="keywordflow">return</span> in + 1;
<a name="l00018"></a>00018 }
<a name="l00019"></a>00019
<a name="l00020"></a>00020
<a name="l00021"></a>00021 FTGLTextureFont::FTGLTextureFont( <span class="keyword">const</span> <span class="keywordtype">char</span>* fontname)
<a name="l00022"></a>00022 : FTFont( fontname),
<a name="l00023"></a>00023 maxTextSize(0),
<a name="l00024"></a>00024 textureWidth(0),
<a name="l00025"></a>00025 textureHeight(0),
<a name="l00026"></a>00026 glyphHeight(0),
<a name="l00027"></a>00027 glyphWidth(0),
<a name="l00028"></a>00028 padding(3),
<a name="l00029"></a>00029 xOffset(0),
<a name="l00030"></a>00030 yOffset(0)
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 remGlyphs = numGlyphs = face.GlyphCount();
<a name="l00033"></a>00033 }
<a name="l00034"></a>00034
<a name="l00035"></a>00035
<a name="l00036"></a>00036 FTGLTextureFont::FTGLTextureFont( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *pBufferBytes, size_t bufferSizeInBytes)
<a name="l00037"></a>00037 : FTFont( pBufferBytes, bufferSizeInBytes),
<a name="l00038"></a>00038 maxTextSize(0),
<a name="l00039"></a>00039 textureWidth(0),
<a name="l00040"></a>00040 textureHeight(0),
<a name="l00041"></a>00041 glyphHeight(0),
<a name="l00042"></a>00042 glyphWidth(0),
<a name="l00043"></a>00043 padding(3),
<a name="l00044"></a>00044 xOffset(0),
<a name="l00045"></a>00045 yOffset(0)
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 remGlyphs = numGlyphs = face.GlyphCount();
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050
<a name="l00051"></a>00051 FTGLTextureFont::~FTGLTextureFont()
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 glDeleteTextures( textureIDList.size(), (<span class="keyword">const</span> GLuint*)&textureIDList[0]);
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055
<a name="l00056"></a>00056
<a name="l00057"></a>00057 FTGlyph* FTGLTextureFont::MakeGlyph( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> glyphIndex)
<a name="l00058"></a>00058 {
<a name="l00059"></a>00059 FT_GlyphSlot ftGlyph = face.Glyph( glyphIndex, FT_LOAD_NO_HINTING);
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keywordflow">if</span>( ftGlyph)
<a name="l00062"></a>00062 {
<a name="l00063"></a>00063 glyphHeight = static_cast<int>( charSize.Height());
<a name="l00064"></a>00064 glyphWidth = static_cast<int>( charSize.Width());
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="keywordflow">if</span>( textureIDList.empty())
<a name="l00067"></a>00067 {
<a name="l00068"></a>00068 textureIDList.push_back( CreateTexture());
<a name="l00069"></a>00069 xOffset = yOffset = padding;
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordflow">if</span>( xOffset > ( textureWidth - glyphWidth))
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074 xOffset = padding;
<a name="l00075"></a>00075 yOffset += glyphHeight;
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keywordflow">if</span>( yOffset > ( textureHeight - glyphHeight))
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079 textureIDList.push_back( CreateTexture());
<a name="l00080"></a>00080 yOffset = padding;
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00084"></a>00084 FTTextureGlyph* tempGlyph = <span class="keyword">new</span> FTTextureGlyph( ftGlyph, textureIDList[textureIDList.size() - 1],
<a name="l00085"></a>00085 xOffset, yOffset, textureWidth, textureHeight);
<a name="l00086"></a>00086 xOffset += static_cast<int>( tempGlyph->BBox().upperX - tempGlyph->BBox().lowerX + padding);
<a name="l00087"></a>00087
<a name="l00088"></a>00088 --remGlyphs;
<a name="l00089"></a>00089 <span class="keywordflow">return</span> tempGlyph;
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091
<a name="l00092"></a>00092 err = face.Error();
<a name="l00093"></a>00093 <span class="keywordflow">return</span> NULL;
<a name="l00094"></a>00094 }
<a name="l00095"></a>00095
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="keywordtype">void</span> FTGLTextureFont::CalculateTextureSize()
<a name="l00098"></a>00098 {
<a name="l00099"></a>00099 <span class="keywordflow">if</span>( !maxTextSize)
<a name="l00100"></a>00100 {
<a name="l00101"></a>00101 glGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*)&maxTextSize);
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103
<a name="l00104"></a>00104 textureWidth = <a class="code" href="FTGLTextureFont_8cpp.html#cebec7d37f54b765683c095786dfa2d6">NextPowerOf2</a>( (remGlyphs * glyphWidth) + ( padding * 2));
<a name="l00105"></a>00105 <span class="keywordflow">if</span>( textureWidth > maxTextSize)
<a name="l00106"></a>00106 {
<a name="l00107"></a>00107 textureWidth = maxTextSize;
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109
<a name="l00110"></a>00110 <span class="keywordtype">int</span> h = static_cast<int>( (textureWidth - ( padding * 2)) / glyphWidth);
<a name="l00111"></a>00111
<a name="l00112"></a>00112 textureHeight = <a class="code" href="FTGLTextureFont_8cpp.html#cebec7d37f54b765683c095786dfa2d6">NextPowerOf2</a>( (( numGlyphs / h) + 1) * glyphHeight);
<a name="l00113"></a>00113 textureHeight = textureHeight > maxTextSize ? maxTextSize : textureHeight;
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115
<a name="l00116"></a>00116
<a name="l00117"></a>00117 GLuint FTGLTextureFont::CreateTexture()
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119 CalculateTextureSize();
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="keywordtype">int</span> totalMemory = textureWidth * textureHeight;
<a name="l00122"></a>00122 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>* textureMemory = <span class="keyword">new</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>[totalMemory];
<a name="l00123"></a>00123 memset( textureMemory, 0, totalMemory);
<a name="l00124"></a>00124
<a name="l00125"></a>00125 GLuint textID;
<a name="l00126"></a>00126 glGenTextures( 1, (GLuint*)&textID);
<a name="l00127"></a>00127
<a name="l00128"></a>00128 glBindTexture( GL_TEXTURE_2D, textID);
<a name="l00129"></a>00129 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
<a name="l00130"></a>00130 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
<a name="l00131"></a>00131 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
<a name="l00132"></a>00132 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
<a name="l00133"></a>00133
<a name="l00134"></a>00134 glTexImage2D( GL_TEXTURE_2D, 0, GL_ALPHA, textureWidth, textureHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, textureMemory);
<a name="l00135"></a>00135
<a name="l00136"></a>00136 <span class="keyword">delete</span> [] textureMemory;
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="keywordflow">return</span> textID;
<a name="l00139"></a>00139 }
<a name="l00140"></a>00140
<a name="l00141"></a>00141
<a name="l00142"></a>00142 <span class="keywordtype">bool</span> FTGLTextureFont::FaceSize( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> res)
<a name="l00143"></a>00143 {
<a name="l00144"></a>00144 <span class="keywordflow">if</span>( !textureIDList.empty())
<a name="l00145"></a>00145 {
<a name="l00146"></a>00146 glDeleteTextures( textureIDList.size(), (<span class="keyword">const</span> GLuint*)&textureIDList[0]);
<a name="l00147"></a>00147 remGlyphs = numGlyphs = face.GlyphCount();
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149
<a name="l00150"></a>00150 <span class="keywordflow">return</span> FTFont::FaceSize( size, res);
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="keywordtype">void</span> FTGLTextureFont::Render( <span class="keyword">const</span> <span class="keywordtype">char</span>* string)
<a name="l00155"></a>00155 {
<a name="l00156"></a>00156 glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
<a name="l00157"></a>00157
<a name="l00158"></a>00158 glEnable(GL_BLEND);
<a name="l00159"></a>00159 glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); <span class="comment">// GL_ONE</span>
<a name="l00160"></a>00160
<a name="l00161"></a>00161 FTFont::Render( string);
<a name="l00162"></a>00162
<a name="l00163"></a>00163 glPopAttrib();
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="keywordtype">void</span> FTGLTextureFont::Render( <span class="keyword">const</span> <span class="keywordtype">wchar_t</span>* string)
<a name="l00168"></a>00168 {
<a name="l00169"></a>00169 glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
<a name="l00170"></a>00170
<a name="l00171"></a>00171 glEnable(GL_BLEND);
<a name="l00172"></a>00172 glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); <span class="comment">// GL_ONE</span>
<a name="l00173"></a>00173
<a name="l00174"></a>00174 FTFont::Render( string);
<a name="l00175"></a>00175
<a name="l00176"></a>00176 glPopAttrib();
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Wed Aug 23 03:47:29 2006 for FTGL by
<a href="http://www.doxygen.org/index.html">
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