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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>00001 <span class="preprocessor">#include &lt;string&gt;</span> <span class="comment">// For memset</span>
00002 
00003 <span class="preprocessor">#include "<a class="code" href="FTGLTextureFont_8h.html">FTGLTextureFont.h</a>"</span>
00004 <span class="preprocessor">#include "<a class="code" href="FTTextureGlyph_8h.html">FTTextureGlyph.h</a>"</span>
00005 
00006 
<a name="l00007"></a><a class="code" href="FTGLTextureFont_8cpp.html#a0">00007</a> <span class="keyword">inline</span> GLuint <a class="code" href="FTGLTextureFont_8cpp.html#a0">NextPowerOf2</a>( GLuint in)
00008 {
00009      in -= 1;
00010 
00011      in |= in &gt;&gt; 16;
00012      in |= in &gt;&gt; 8;
00013      in |= in &gt;&gt; 4;
00014      in |= in &gt;&gt; 2;
00015      in |= in &gt;&gt; 1;
00016 
00017      <span class="keywordflow">return</span> in + 1;
00018 }
00019 
00020 
<a name="l00021"></a><a class="code" href="classFTGLTextureFont.html#a0">00021</a> <a class="code" href="classFTGLTextureFont.html#a0">FTGLTextureFont::FTGLTextureFont</a>( <span class="keyword">const</span> <span class="keywordtype">char</span>* fontFilePath)
00022 :   <a class="code" href="classFTFont.html">FTFont</a>( fontFilePath),
00023     maximumGLTextureSize(0),
00024     textureWidth(0),
00025     textureHeight(0),
00026     glyphHeight(0),
00027     glyphWidth(0),
00028     padding(3),
00029     xOffset(0),
00030     yOffset(0)
00031 {
00032     remGlyphs = numGlyphs = face.<a class="code" href="classFTFace.html#a11">GlyphCount</a>();
00033 }
00034 
00035 
<a name="l00036"></a><a class="code" href="classFTGLTextureFont.html#a1">00036</a> <a class="code" href="classFTGLTextureFont.html#a0">FTGLTextureFont::FTGLTextureFont</a>( <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *pBufferBytes, size_t bufferSizeInBytes)
00037 :   <a class="code" href="classFTFont.html">FTFont</a>( pBufferBytes, bufferSizeInBytes),
00038     maximumGLTextureSize(0),
00039     textureWidth(0),
00040     textureHeight(0),
00041     glyphHeight(0),
00042     glyphWidth(0),
00043     padding(3),
00044     xOffset(0),
00045     yOffset(0)
00046 {
00047     remGlyphs = numGlyphs = face.<a class="code" href="classFTFace.html#a11">GlyphCount</a>();
00048 }
00049 
00050 
<a name="l00051"></a><a class="code" href="classFTGLTextureFont.html#a2">00051</a> <a class="code" href="classFTGLTextureFont.html#a2">FTGLTextureFont::~FTGLTextureFont</a>()
00052 {
00053     glDeleteTextures( textureIDList.<a class="code" href="classFTVector.html#a3">size</a>(), (<span class="keyword">const</span> GLuint*)&amp;textureIDList[0]);
00054 }
00055 
00056 
00057 <a class="code" href="classFTGlyph.html">FTGlyph</a>* <a class="code" href="classFTFont.html#b0">FTGLTextureFont::MakeGlyph</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> glyphIndex)
00058 {
00059     FT_GlyphSlot ftGlyph = face.<a class="code" href="classFTFace.html#a10">Glyph</a>( glyphIndex, FT_LOAD_NO_HINTING);
00060     
00061     <span class="keywordflow">if</span>( ftGlyph)
00062     {
00063         glyphHeight = static_cast&lt;int&gt;( charSize.<a class="code" href="classFTSize.html#a6">Height</a>());
00064         glyphWidth = static_cast&lt;int&gt;( charSize.<a class="code" href="classFTSize.html#a7">Width</a>());
00065         
00066         <span class="keywordflow">if</span>( textureIDList.<a class="code" href="classFTVector.html#a9">empty</a>())
00067         {
00068             textureIDList.<a class="code" href="classFTVector.html#a14">push_back</a>( CreateTexture());
00069             xOffset = yOffset = padding;
00070         }
00071         
00072         <span class="keywordflow">if</span>( xOffset &gt; ( textureWidth - glyphWidth))
00073         {
00074             xOffset = padding;
00075             yOffset += glyphHeight;
00076             
00077             <span class="keywordflow">if</span>( yOffset &gt; ( textureHeight - glyphHeight))
00078             {
00079                 textureIDList.<a class="code" href="classFTVector.html#a14">push_back</a>( CreateTexture());
00080                 yOffset = padding;
00081             }
00082         }
00083         
00084         <a class="code" href="classFTTextureGlyph.html">FTTextureGlyph</a>* tempGlyph = <span class="keyword">new</span> <a class="code" href="classFTTextureGlyph.html">FTTextureGlyph</a>( ftGlyph, textureIDList[textureIDList.<a class="code" href="classFTVector.html#a3">size</a>() - 1],
00085                                                         xOffset, yOffset, textureWidth, textureHeight);
00086         xOffset += static_cast&lt;int&gt;( tempGlyph-&gt;<a class="code" href="classFTGlyph.html#a4">BBox</a>().<a class="code" href="classFTBBox.html#o3">upperX</a> - tempGlyph-&gt;<a class="code" href="classFTGlyph.html#a4">BBox</a>().<a class="code" href="classFTBBox.html#o0">lowerX</a> + padding);
00087         
00088         --remGlyphs;
00089         <span class="keywordflow">return</span> tempGlyph;
00090     }
00091     
00092     <a class="code" href="classFTFont.html#p3">err</a> = <a class="code" href="classFTFont.html#p0">face</a>.<a class="code" href="classFTFace.html#a12">Error</a>();
00093     <span class="keywordflow">return</span> NULL;
00094 }
00095 
00096 
00097 <span class="keywordtype">void</span> FTGLTextureFont::CalculateTextureSize()
00098 {
00099     <span class="keywordflow">if</span>( !maximumGLTextureSize)
00100     {
00101         glGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*)&amp;maximumGLTextureSize);
00102         assert(maximumGLTextureSize); <span class="comment">// If you hit this then you have an invalid OpenGL context.</span>
00103     }
00104     
00105     textureWidth = <a class="code" href="FTGLTextureFont_8cpp.html#a0">NextPowerOf2</a>( (remGlyphs * glyphWidth) + ( padding * 2));
00106     textureWidth = textureWidth &gt; maximumGLTextureSize ? maximumGLTextureSize : textureWidth;
00107     
00108     <span class="keywordtype">int</span> h = static_cast&lt;int&gt;( (textureWidth - ( padding * 2)) / glyphWidth);
00109         
00110     textureHeight = <a class="code" href="FTGLTextureFont_8cpp.html#a0">NextPowerOf2</a>( (( numGlyphs / h) + 1) * glyphHeight);
00111     textureHeight = textureHeight &gt; maximumGLTextureSize ? maximumGLTextureSize : textureHeight;
00112 }
00113 
00114 
00115 GLuint FTGLTextureFont::CreateTexture()
00116 {   
00117     CalculateTextureSize();
00118     
00119     <span class="keywordtype">int</span> totalMemory = textureWidth * textureHeight;
00120     <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];
00121     memset( textureMemory, 0, totalMemory);
00122 
00123     GLuint textID;
00124     glGenTextures( 1, (GLuint*)&amp;textID);
00125 
00126     glBindTexture( GL_TEXTURE_2D, textID);
00127     glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
00128     glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
00129     glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
00130     glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
00131 
00132     glTexImage2D( GL_TEXTURE_2D, 0, GL_ALPHA, textureWidth, textureHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, textureMemory);
00133 
00134     <span class="keyword">delete</span> [] textureMemory;
00135 
00136     <span class="keywordflow">return</span> textID;
00137 }
00138 
00139 
<a name="l00140"></a><a class="code" href="classFTGLTextureFont.html#a3">00140</a> <span class="keywordtype">bool</span> <a class="code" href="classFTFont.html#a9">FTGLTextureFont::FaceSize</a>( <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)
00141 {
00142     <span class="keywordflow">if</span>( !textureIDList.<a class="code" href="classFTVector.html#a9">empty</a>())
00143     {
00144         glDeleteTextures( textureIDList.<a class="code" href="classFTVector.html#a3">size</a>(), (<span class="keyword">const</span> GLuint*)&amp;textureIDList[0]);
00145         textureIDList.<a class="code" href="classFTVector.html#a12">clear</a>();
00146         remGlyphs = numGlyphs = face.<a class="code" href="classFTFace.html#a11">GlyphCount</a>();
00147     }
00148 
00149     <span class="keywordflow">return</span> <a class="code" href="classFTFont.html#a9">FTFont::FaceSize</a>( size, res);
00150 }
00151 
00152 
<a name="l00153"></a><a class="code" href="classFTGLTextureFont.html#a4">00153</a> <span class="keywordtype">void</span> <a class="code" href="classFTGLTextureFont.html#a4">FTGLTextureFont::Render</a>( <span class="keyword">const</span> <span class="keywordtype">char</span>* string)
00154 {   
00155     glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
00156     
00157     glEnable(GL_BLEND);
00158     glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); <span class="comment">// GL_ONE</span>
00159 
00160     <a class="code" href="classFTTextureGlyph.html#e0">FTTextureGlyph::ResetActiveTexture</a>();
00161     
00162     <a class="code" href="classFTFont.html#a19">FTFont::Render</a>( string);
00163 
00164     glPopAttrib();
00165 }
00166 
00167 
<a name="l00168"></a><a class="code" href="classFTGLTextureFont.html#a5">00168</a> <span class="keywordtype">void</span> <a class="code" href="classFTGLTextureFont.html#a4">FTGLTextureFont::Render</a>( <span class="keyword">const</span> <span class="keywordtype">wchar_t</span>* string)
00169 {   
00170     glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
00171     
00172     glEnable(GL_BLEND);
00173     glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); <span class="comment">// GL_ONE</span>
00174     
00175     <a class="code" href="classFTTextureGlyph.html#e0">FTTextureGlyph::ResetActiveTexture</a>();
00176     
00177     <a class="code" href="classFTFont.html#a19">FTFont::Render</a>( string);
00178     
00179     glPopAttrib();
00180 }
00181 
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