Changeset 3682 in orxonox.OLD for orxonox/branches/textEngine/src/lib/graphics/font/glfont.cc

Timestamp:

Mar 30, 2005, 9:14:35 PM (20 years ago)

Author:

bensch

Message:

orxonox/branches/textEngine: configure.ac adapded, and some minor changes at glfont

File:

• orxonox/branches/textEngine/src/lib/graphics/font/glfont.cc (modified) (2 diffs)

orxonox/branches/textEngine/src/lib/graphics/font/glfont.cc

@@ -55 +55 @@
 #include <SDL/SDL_ttf.h>
 
-#include "../glincl.h"
-#include "../debug.h"
+#include "glincl.h"
+#include "debug.h"
 
 
@@ -276 +276 @@
 
 char Usage[100] = "orxonox test" ;
-void SDL_GL_Enter2DMode()
-{
-}
-
-void SDL_GL_Leave2DMode()
-{
-}
+void GLFont::enter2DMode()
+{
+  SDL_Surface *screen = SDL_GetVideoSurface();
+  
+  /* Note, there may be other things you need to change,
+     depending on how you have your OpenGL state set up.
+  */
+  glPushAttrib(GL_ENABLE_BIT);
+  glDisable(GL_DEPTH_TEST);
+  glDisable(GL_CULL_FACE);
+  glEnable(GL_TEXTURE_2D);
+  
+  /* This allows alpha blending of 2D textures with the scene */
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+  
+  glViewport(0, 0, screen->w, screen->h);
+  
+  glMatrixMode(GL_PROJECTION);
+  glPushMatrix();
+  glLoadIdentity();
+  
+  glOrtho(0.0, (GLdouble)screen->w, (GLdouble)screen->h, 0.0, 0.0, 1.0);
+  
+  glMatrixMode(GL_MODELVIEW);
+  glPushMatrix();
+  glLoadIdentity();
+  
+  glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+}
+
+
+void GLFont::leave2DMode()
+{
+        glMatrixMode(GL_MODELVIEW);
+        glPopMatrix();
+
+        glMatrixMode(GL_PROJECTION);
+        glPopMatrix();
+
+        glPopAttrib();
+}
+
+
+GLuint GLFont::loadTexture(SDL_Surface *surface, GLfloat *texcoord)
+{
+  GLuint texture;
+  int w, h;
+  SDL_Surface *image;
+  SDL_Rect area;
+  Uint32 saved_flags;
+  Uint8  saved_alpha;
+  
+  /* Use the surface width and height expanded to powers of 2 */
+  w = power_of_two(surface->w);
+  h = power_of_two(surface->h);
+  texcoord[0] = 0.0f;                   /* Min X */
+  texcoord[1] = 0.0f;                   /* Min Y */
+  texcoord[2] = (GLfloat)surface->w / w;        /* Max X */
+  texcoord[3] = (GLfloat)surface->h / h;        /* Max Y */
+  
+  image = SDL_CreateRGBSurface(
+                               SDL_SWSURFACE,
+                               w, h,
+                               32,
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
+                               0x000000FF, 
+                               0x0000FF00, 
+                               0x00FF0000, 
+                               0xFF000000
+#else
+                               0xFF000000,
+                               0x00FF0000, 
+                               0x0000FF00, 
+                               0x000000FF
+#endif
+                               );
+  if ( image == NULL ) {
+    return 0;
+  }
+  
+  /* Save the alpha blending attributes */
+  saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK);
+  saved_alpha = surface->format->alpha;
+  if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
+    SDL_SetAlpha(surface, 0, 0);
+  }
+  
+  /* Copy the surface into the GL texture image */
+  area.x = 0;
+  area.y = 0;
+  area.w = surface->w;
+  area.h = surface->h;
+  SDL_BlitSurface(surface, &area, image, &area);
+  
+  /* Restore the alpha blending attributes */
+  if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) {
+    SDL_SetAlpha(surface, saved_flags, saved_alpha);
+  }
+  
+  /* Create an OpenGL texture for the image */
+  glGenTextures(1, &texture);
+  glBindTexture(GL_TEXTURE_2D, texture);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexImage2D(GL_TEXTURE_2D,
+               0,
+               GL_RGBA,
+               w, h,
+               0,
+               GL_RGBA,
+               GL_UNSIGNED_BYTE,
+               image->pixels);
+  SDL_FreeSurface(image); /* No longer needed */
+  
+  return texture;
+}
+
 
 /* Quick utility function for texture creation */
-static int power_of_two(int input)
-{
-}
-
-
-
-GLuint SDL_GL_LoadTexture(SDL_Surface *surface, GLfloat *texcoord)
-{
-
-}
-
-int setup(int argc, char *argv[])
-{
-        char *argv0 = argv[0];
-        SDL_Surface *screen;
-        TTF_Font *font;
-        SDL_Surface *text;
-        int ptsize;
-        int i, done;
-        SDL_Color white = { 0xFF, 0xFF, 0xFF, 0 };
-        SDL_Color black = { 0x00, 0x00, 0x00, 0 };
-        SDL_Color *forecol;
-        SDL_Color *backcol;
-        GLenum gl_error;
-        GLuint texture;
-        int x, y, w, h;
-        GLfloat texcoord[4];
-        GLfloat texMinX, texMinY;
-        GLfloat texMaxX, texMaxY;
-
-        int renderstyle;
-        int dump;
-        enum {
-                RENDER_LATIN1,
-                RENDER_UTF8,
-                RENDER_UNICODE
-        } rendertype;
-        char *message;
-
-        /* Look for special execution mode */
-        dump = 0;
-        /* Look for special rendering types */
-        rendertype = RENDER_LATIN1;
-        /* Default is black and white */
-        forecol = &black;
-        backcol = &white;
-        for ( i=1; argv[i] && argv[i][0] == '-'; ++i ) {
-                if ( strcmp(argv[i], "-utf8") == 0 ) {
-                        rendertype = RENDER_UTF8;
-                } else
-                if ( strcmp(argv[i], "-unicode") == 0 ) {
-                        rendertype = RENDER_UNICODE;
-                } else
-                if ( strcmp(argv[i], "-b") == 0 ) {
-                        renderstyle |= TTF_STYLE_BOLD;
-                } else
-                if ( strcmp(argv[i], "-i") == 0 ) {
-                        renderstyle |= TTF_STYLE_ITALIC;
-                } else
-                if ( strcmp(argv[i], "-u") == 0 ) {
-                        renderstyle |= TTF_STYLE_UNDERLINE;
-                } else
-                if ( strcmp(argv[i], "-dump") == 0 ) {
-                        dump = 1;
-                } else
-                if ( strcmp(argv[i], "-fgcol") == 0 ) {
-                        int r, g, b;
-                        if ( sscanf (argv[++i], "%d,%d,%d", &r, &g, &b) != 3 ) {
-                                fprintf(stderr, Usage, argv0);
-                                return(1);
-                        }
-                        forecol->r = (Uint8)r;
-                        forecol->g = (Uint8)g;
-                        forecol->b = (Uint8)b;
-                } else
-                if ( strcmp(argv[i], "-bgcol") == 0 ) {
-                        int r, g, b;
-                        if ( sscanf (argv[++i], "%d,%d,%d", &r, &g, &b) != 3 ) {
-                                fprintf(stderr, Usage, argv0);
-                                return(1);
-                        }
-                        backcol->r = (Uint8)r;
-                        backcol->g = (Uint8)g;
-                        backcol->b = (Uint8)b;
-                } else {
-                        fprintf(stderr, Usage, argv0);
-                        return(1);
-                }
-        }
-        argv += i;
-        argc -= i;
-
-        /* Check usage */
-        if ( ! argv[0] ) {
-                fprintf(stderr, Usage, argv0);
-                return(1);
-        }
-
-        /* Initialize SDL */
-        if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
-                fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
-                return(2);
-        }
-        atexit(SDL_Quit);
-
-        /* Initialize the TTF library */
-        if ( TTF_Init() < 0 ) {
-                fprintf(stderr, "Couldn't initialize TTF: %s\n",SDL_GetError());
-                return(2);
-        }
-        atexit(TTF_Quit);
-
-        /* Open the font file with the requested point size */
-        ptsize = 0;
-        if ( argc > 1 ) {
-                ptsize = atoi(argv[1]);
-        }
-        if ( ptsize == 0 ) {
-                i = 2;
-                ptsize = DEFAULT_PTSIZE;
-        } else {
-                i = 3;
-        }
-        font = TTF_OpenFont(argv[0], ptsize);
-        if ( font == NULL ) {
-                fprintf(stderr, "Couldn't load %d pt font from %s: %s\n",
-                                        ptsize, argv[0], SDL_GetError());
-                return(2);
-        }
-
-        if( dump ) {
-
-                for( i = 48; i < 123; i++ ) {
-                        SDL_Surface* glyph = NULL;
-
-                        glyph = TTF_RenderGlyph_Shaded( font, i, *forecol, *backcol );
-
-                        if( glyph ) {
-                                char outname[64];
-                                sprintf( outname, "glyph-%d.bmp", i );
-                                SDL_SaveBMP( glyph, outname );
-                        }
-
-                }
-
-                return( 0 );
-        }
-
-        /* Set a 640x480 video mode */
-        screen = SDL_SetVideoMode(640, 480, 0, SDL_OPENGL);
-        if ( screen == NULL ) {
-                fprintf(stderr, "Couldn't set 640x480 OpenGL mode: %s\n",
-                                                        SDL_GetError());
-                return(2);
-        }
-
-        /* Render and center the message */
-        if ( argc > 2 ) {
-                message = argv[2];
-        } else {
-                message = DEFAULT_TEXT;
-        }
-        switch (rendertype) {
-            case RENDER_LATIN1:
-                text = TTF_RenderText_Blended(font, message, *forecol);
-                break;
-
-            case RENDER_UTF8:
-                text = TTF_RenderUTF8_Blended(font, message, *forecol);
-                break;
-
-            case RENDER_UNICODE:
-                {
-                        /* This doesn't actually work because you can't pass
-                           UNICODE text in via command line, AFAIK, but...
-                         */
-                        Uint16 unicode_text[BUFSIZ];
-                        int index;
-                        for ( index = 0; (message[0] || message[1]); ++index ) {
-                                unicode_text[index]  = ((Uint8 *)message)[0];
-                                unicode_text[index] <<= 8;
-                                unicode_text[index] |= ((Uint8 *)message)[1];
-                                message += 2;
-                        }
-                        text = TTF_RenderUNICODE_Blended(font,
-                                        unicode_text, *forecol);
-                }
-                break;
-            default:
-                text = NULL; /* This shouldn't happen */
-                break;
-        }
-        if ( text == NULL ) {
-                fprintf(stderr, "Couldn't render text: %s\n", SDL_GetError());
-                TTF_CloseFont(font);
-                return(2);
-        }
-        x = (screen->w - text->w)/2;
-        y = (screen->h - text->h)/2;
-        w = text->w;
-        h = text->h;
-        printf("Font is generally %d big, and string is %hd big\n",
-                                                TTF_FontHeight(font), text->h);
-
-        /* Convert the text into an OpenGL texture */
-        glGetError();
-        texture = SDL_GL_LoadTexture(text, texcoord);
-        if ( (gl_error = glGetError()) != GL_NO_ERROR ) {
-                /* If this failed, the text may exceed texture size limits */
-                printf("Warning: Couldn't create texture: 0x%x\n", gl_error);
-        }
-
-        /* Make texture coordinates easy to understand */
-        texMinX = texcoord[0];
-        texMinY = texcoord[1];
-        texMaxX = texcoord[2];
-        texMaxY = texcoord[3];
-
-        /* We don't need the original text surface anymore */
-        SDL_FreeSurface(text);
-
-        /* Initialize the GL state */
-        glViewport( 0, 0, screen->w, screen->h );
-        glMatrixMode( GL_PROJECTION );
-        glLoadIdentity( );
-
-        glOrtho( -2.0, 2.0, -2.0, 2.0, -20.0, 20.0 );
-
-        glMatrixMode( GL_MODELVIEW );
-        glLoadIdentity( );
-
-        glEnable(GL_DEPTH_TEST);
-
-        glDepthFunc(GL_LESS);
-
-        glShadeModel(GL_SMOOTH);
-
-        /* Wait for a keystroke, and blit text on mouse press */
-        done = 0;
-        while ( ! done ) {
-
-          /* Show the text on the screen */
-          SDL_GL_Enter2DMode();
-          glBindTexture(GL_TEXTURE_2D, texture);
-          glBegin(GL_QUADS);
-          glTexCoord2f(texMinX, texMinY); glVertex2i(x,   y  );
-          glTexCoord2f(texMaxX, texMinY); glVertex2i(x+w, y  );
-          glTexCoord2f(texMinX, texMaxY); glVertex2i(x,   y+h);
-          glTexCoord2f(texMaxX, texMaxY); glVertex2i(x+w, y+h);
-          glEnd();
-          SDL_GL_Leave2DMode();
-          
-          /* Swap the buffers so everything is visible */
-          SDL_GL_SwapBuffers( );
-        }
-        TTF_CloseFont(font);
-        return(0);
-}
-
+int GLFont::power_of_two(int input)
+{
+  int value = 1;
+  
+  while ( value < input ) {
+    value <<= 1;
+  }
+  return value;
+}