Added support for multiple graphics contexts, submission from Max Rhiener.
Alas changed the indenting to use 4 spaces instead of tabs, this irons out differences when working under Windows and Unix, keeping the identing consistent.
This commit is contained in:
Robert Osfield
@@ -1,6 +1,6 @@
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#include "FTGLTextureFont.h"
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#include "FTGlyphContainer.h"
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#include "FTTextureGlyph.h"
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#include "FTGLTextureFont.h"
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#include "FTGlyphContainer.h"
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#include "FTTextureGlyph.h"
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inline GLuint NextPowerOf2( GLuint in)
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{
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@@ -17,188 +17,215 @@ inline GLuint NextPowerOf2( GLuint in)
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FTGLTextureFont::FTGLTextureFont()
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: maxTextSize(0),
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textureWidth(0),
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textureHeight(0),
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numTextures(1),
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textMem(0),
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glyphHeight(0),
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glyphWidth(0),
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padding(1)
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: maxTextSize(0),
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textureWidth(0),
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textureHeight(0),
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numTextures(1),
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textMem(0),
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glyphHeight(0),
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glyphWidth(0),
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padding(1)
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{}
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FTGLTextureFont::FTGLTextureFont(int textureSize)
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: maxTextSize(textureSize),
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textureWidth(0),
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textureHeight(0),
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numTextures(1),
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textMem(0),
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glyphHeight(0),
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glyphWidth(0),
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padding(1)
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: maxTextSize(textureSize),
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textureWidth(0),
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textureHeight(0),
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numTextures(1),
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textMem(0),
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glyphHeight(0),
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glyphWidth(0),
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padding(1)
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{}
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FTGLTextureFont::~FTGLTextureFont()
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{
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glDeleteTextures( numTextures, (const GLuint*)glTextureID);
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ContextTextureId::iterator itr;
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for(itr=glContextTextureID.begin();itr != glContextTextureID.end(); itr++)
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{
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glDeleteTextures( numTextures, (const GLuint*)*itr);
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delete *itr;
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}
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}
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bool FTGLTextureFont::MakeGlyphList()
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// mrn@changes
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bool FTGLTextureFont::MakeGlyphList(unsigned int renderContext)
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{
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if( !maxTextSize)
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glGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*)&maxTextSize);
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glyphHeight = ( charSize.Height()) + padding;
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glyphWidth = ( charSize.Width()) + padding;
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GetSize();
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GLuint totalMem;
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FTGlyphContainer* glyphList=_contextGlyphList[renderContext];
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if( textureHeight > (maxTextSize-padding*2))
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{
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numTextures = static_cast<int>( textureHeight / (maxTextSize-padding*2)) + 1;
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if( numTextures > 15) // FIXME
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numTextures = 15;
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GLsizei heightRemain = NextPowerOf2( textureHeight % (maxTextSize-padding*2));
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totalMem = ((maxTextSize * ( numTextures - 1)) + heightRemain) * textureWidth;
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// check the context
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while (glContextTextureID.size() <= renderContext)
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glContextTextureID.push_back(NULL);
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unsigned long* glTextureID=glContextTextureID[renderContext];
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if(glTextureID)
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return true;
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else
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{
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glTextureID=new unsigned long[16];
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glContextTextureID[renderContext]=glTextureID;
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}
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glGenTextures( numTextures, (GLuint*)&glTextureID[0]);
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textMem = new unsigned char[totalMem]; // GL_ALPHA texture;
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memset( textMem, 0, totalMem);
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unsigned int glyphNum = 0;
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unsigned char* currTextPtr = textMem;
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for( int x = 0; x < numTextures - 1; ++x)
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{
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glyphNum = FillGlyphs( glyphNum, glTextureID[x], textureWidth, maxTextSize, currTextPtr);
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CreateTexture( x, textureWidth, maxTextSize, currTextPtr);
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currTextPtr += ( textureWidth * maxTextSize);
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++glyphNum;
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}
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glyphNum = FillGlyphs( glyphNum, glTextureID[numTextures - 1], textureWidth, heightRemain, currTextPtr);
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CreateTexture( numTextures - 1, textureWidth, heightRemain, currTextPtr);
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}
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else
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{
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textureHeight = NextPowerOf2( textureHeight+padding*2);
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totalMem = textureWidth * textureHeight;
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glGenTextures( numTextures, (GLuint*)&glTextureID[0]);
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textMem = new unsigned char[totalMem]; // GL_ALPHA texture;
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memset( textMem, 0, totalMem);
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FillGlyphs( 0, glTextureID[0], textureWidth, textureHeight, textMem);
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CreateTexture( 0, textureWidth, textureHeight, textMem);
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}
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delete [] textMem;
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return !err;
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}
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unsigned int FTGLTextureFont::FillGlyphs( unsigned int glyphStart, GLuint id, GLsizei width, GLsizei height, unsigned char* textdata)
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{
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int currentTextX = padding;
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int currentTextY = padding;// + padding;
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float currTextU = (float)padding / (float)width;
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float currTextV = (float)padding / (float)height;
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unsigned int n;
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if( !maxTextSize)
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glGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*)&maxTextSize);
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for( n = glyphStart; n <= numGlyphs; ++n)
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{
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FT_Glyph* ftGlyph = face.Glyph( n, FT_LOAD_NO_HINTING);
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if( ftGlyph)
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{
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unsigned char* data = textdata + (( currentTextY * width) + currentTextX);
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currTextU = (float)currentTextX / (float)width;
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FTTextureGlyph* tempGlyph = new FTTextureGlyph( *ftGlyph, id, data, width, height, currTextU, currTextV);
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glyphList->Add( tempGlyph);
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glyphHeight = ( charSize.Height()) + padding;
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glyphWidth = ( charSize.Width()) + padding;
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GetSize();
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GLuint totalMem;
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currentTextX += glyphWidth;
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if( currentTextX > ( width - glyphWidth))
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{
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currentTextY += glyphHeight;
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if( currentTextY > ( height - glyphHeight))
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return n;
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currentTextX = padding;
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currTextV = (float)currentTextY / (float)height;
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}
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}
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else
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{
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err = face.Error();
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}
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}
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if( textureHeight > (maxTextSize-padding*2))
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{
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numTextures = static_cast<int>( textureHeight / (maxTextSize-padding*2)) + 1;
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if( numTextures > 15) // FIXME
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numTextures = 15;
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GLsizei heightRemain = NextPowerOf2( textureHeight % (maxTextSize-padding*2));
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totalMem = ((maxTextSize * ( numTextures - 1)) + heightRemain) * textureWidth;
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glGenTextures( numTextures, (GLuint*)&glTextureID[0]);
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textMem = new unsigned char[totalMem]; // GL_ALPHA texture;
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memset( textMem, 0, totalMem);
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unsigned int glyphNum = 0;
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unsigned char* currTextPtr = textMem;
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for( int x = 0; x < numTextures - 1; ++x)
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{
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glyphNum = FillGlyphs( glyphNum, glTextureID[x], textureWidth, maxTextSize, currTextPtr,renderContext);
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CreateTexture( glTextureID[x], textureWidth, maxTextSize, currTextPtr);
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currTextPtr += ( textureWidth * maxTextSize);
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++glyphNum;
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}
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glyphNum = FillGlyphs( glyphNum, glTextureID[numTextures - 1], textureWidth, heightRemain, currTextPtr,renderContext);
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CreateTexture( glTextureID[numTextures - 1], textureWidth, heightRemain, currTextPtr);
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}
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else
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{
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textureHeight = NextPowerOf2( textureHeight+padding*2);
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totalMem = textureWidth * textureHeight;
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glGenTextures( numTextures, (GLuint*)&glTextureID[0]);
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textMem = new unsigned char[totalMem]; // GL_ALPHA texture;
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memset( textMem, 0, totalMem);
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FillGlyphs( 0, glTextureID[0], textureWidth, textureHeight, textMem,renderContext);
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CreateTexture( glTextureID[0], textureWidth, textureHeight, textMem);
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}
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delete [] textMem;
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return !err;
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}
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// mrn@changes
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unsigned int FTGLTextureFont::FillGlyphs( unsigned int glyphStart, GLuint id, GLsizei width, GLsizei height, unsigned char* textdata, unsigned int renderContext)
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{
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FTGlyphContainer* glyphList=_contextGlyphList[renderContext];
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int currentTextX = padding;
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int currentTextY = padding;// + padding;
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float currTextU = (float)padding / (float)width;
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float currTextV = (float)padding / (float)height;
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unsigned int n;
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for( n = glyphStart; n <= numGlyphs; ++n)
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{
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FT_Glyph* ftGlyph = face.Glyph( n, FT_LOAD_NO_HINTING);
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if( ftGlyph)
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{
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unsigned char* data = textdata + (( currentTextY * width) + currentTextX);
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currTextU = (float)currentTextX / (float)width;
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FTTextureGlyph* tempGlyph = new FTTextureGlyph( *ftGlyph, id, data, width, height, currTextU, currTextV);
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glyphList->Add( tempGlyph);
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currentTextX += glyphWidth;
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if( currentTextX > ( width - glyphWidth))
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{
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currentTextY += glyphHeight;
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if( currentTextY > ( height - glyphHeight))
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return n;
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currentTextX = padding;
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currTextV = (float)currentTextY / (float)height;
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}
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}
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else
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{
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err = face.Error();
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}
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}
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return n;
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return n;
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}
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void FTGLTextureFont::GetSize()
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{
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//work out the max width. Most likely maxTextSize
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textureWidth = NextPowerOf2( (numGlyphs * glyphWidth) + padding*2);
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if( textureWidth > maxTextSize)
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{
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textureWidth = maxTextSize;
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}
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int h = static_cast<int>( (textureWidth-padding*2) / glyphWidth);
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//work out the max width. Most likely maxTextSize
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textureWidth = NextPowerOf2( (numGlyphs * glyphWidth) + padding*2);
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if( textureWidth > maxTextSize)
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{
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textureWidth = maxTextSize;
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}
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int h = static_cast<int>( (textureWidth-padding*2) / glyphWidth);
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textureHeight = (( numGlyphs / h) + 1) * glyphHeight;
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textureHeight = (( numGlyphs / h) + 1) * glyphHeight;
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}
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// mrn@changes
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void FTGLTextureFont::CreateTexture( GLuint id, GLsizei width, GLsizei height, unsigned char* data)
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{
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glPixelStorei( GL_UNPACK_ALIGNMENT, 1); //What does this do exactly?
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glBindTexture( GL_TEXTURE_2D, glTextureID[id]);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glPixelStorei( GL_UNPACK_ALIGNMENT, 1); //What does this do exactly?
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glBindTexture( GL_TEXTURE_2D, id);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexImage2D( GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data);
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glTexImage2D( GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data);
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}
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void FTGLTextureFont::render( const char* string)
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{
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glPushAttrib( GL_ENABLE_BIT | GL_HINT_BIT | GL_LINE_BIT | GL_PIXEL_MODE_BIT);
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glEnable(GL_BLEND);
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glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
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FTFont::render( string);
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// mrn@changes
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void FTGLTextureFont::render( const char* string, unsigned int renderContext)
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{
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glPushAttrib( GL_ENABLE_BIT | GL_HINT_BIT | GL_LINE_BIT | GL_PIXEL_MODE_BIT);
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glEnable(GL_BLEND);
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glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
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FTFont::render( string,renderContext);
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glPopAttrib();
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glPopAttrib();
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}
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void FTGLTextureFont::render( const wchar_t* string)
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{
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glPushAttrib( GL_ENABLE_BIT | GL_HINT_BIT | GL_LINE_BIT | GL_PIXEL_MODE_BIT);
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glEnable(GL_BLEND);
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glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
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FTFont::render( string);
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glPopAttrib();
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// mrn@changes
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void FTGLTextureFont::render( const wchar_t* string, unsigned int renderContext)
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{
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glPushAttrib( GL_ENABLE_BIT | GL_HINT_BIT | GL_LINE_BIT | GL_PIXEL_MODE_BIT);
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glEnable(GL_BLEND);
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glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
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FTFont::render( string,renderContext);
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glPopAttrib();
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}
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