/** * Initializes the one glyph cache (texture and data structure). * If lcdCache is JNI_TRUE, the texture will contain RGB data, * otherwise we will simply store the grayscale/monochrome glyph images * as intensity values (which work well with the GL_MODULATE function). */ static jboolean OGLTR_InitGlyphCache(jboolean lcdCache) { GlyphCacheInfo *gcinfo; GLclampf priority = 1.0f; GLenum internalFormat = lcdCache ? GL_RGB8 : GL_INTENSITY8; GLenum pixelFormat = lcdCache ? GL_RGB : GL_LUMINANCE; J2dTraceLn(J2D_TRACE_INFO, "OGLTR_InitGlyphCache"); // init vertex cache (if it hasn't been already) if (!OGLVertexCache_InitVertexCache()) { return JNI_FALSE; } // init glyph cache data structure gcinfo = AccelGlyphCache_Init(OGLTR_CACHE_WIDTH, OGLTR_CACHE_HEIGHT, OGLTR_CACHE_CELL_WIDTH, OGLTR_CACHE_CELL_HEIGHT, OGLVertexCache_FlushVertexCache); if (gcinfo == NULL) { J2dRlsTraceLn(J2D_TRACE_ERROR, "OGLTR_InitGlyphCache: could not init OGL glyph cache"); return JNI_FALSE; } // init cache texture object j2d_glGenTextures(1, &gcinfo->cacheID); j2d_glBindTexture(GL_TEXTURE_2D, gcinfo->cacheID); j2d_glPrioritizeTextures(1, &gcinfo->cacheID, &priority); j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); j2d_glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, OGLTR_CACHE_WIDTH, OGLTR_CACHE_HEIGHT, 0, pixelFormat, GL_UNSIGNED_BYTE, NULL); cacheStatus = (lcdCache ? CACHE_LCD : CACHE_GRAY); glyphCache = gcinfo; return JNI_TRUE; }
void OGLTR_EnableGlyphVertexCache(OGLContext *oglc) { J2dTraceLn(J2D_TRACE_INFO, "OGLTR_EnableGlyphVertexCache"); if (!OGLVertexCache_InitVertexCache(oglc)) { return; } if (glyphCache == NULL) { if (!OGLTR_InitGlyphCache(JNI_FALSE)) { return; } } j2d_glEnable(GL_TEXTURE_2D); j2d_glBindTexture(GL_TEXTURE_2D, glyphCache->cacheID); j2d_glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // for grayscale/monochrome text, the current OpenGL source color // is modulated with the glyph image as part of the texture // application stage, so we use GL_MODULATE here OGLC_UPDATE_TEXTURE_FUNCTION(oglc, GL_MODULATE); }