Naive font renderer prototype.

src/Makefile

@@ -1,6 +1,7 @@
 
 SRC = test-map.cpp \
-      game.cpp video.cpp tiler.cpp tileset.cpp scene.cpp layer.cpp map.cpp
+      game.cpp video.cpp tiler.cpp tileset.cpp scene.cpp \
+      font.cpp layer.cpp map.cpp
 
 all: test-map
 

src/font.cpp

@@ -0,0 +1,94 @@
+
+#ifdef WIN32
+#   define WIN32_LEAN_AND_MEAN
+#   include <windows.h>
+#endif
+#if defined __APPLE__ && defined __MACH__
+#   include <OpenGL/gl.h>
+#else
+#   define GL_GLEXT_PROTOTYPES
+#   include <GL/gl.h>
+#endif
+
+#include <SDL.h>
+#include <SDL_image.h>
+
+#include "font.h"
+
+/*
+ * Font implementation class
+ */
+
+class FontData
+{
+    friend class Font;
+
+private:
+    SDL_Surface *img;
+    GLuint texture[1];
+};
+
+/*
+ * Public Font class
+ */
+
+Font::Font(char const *path)
+{
+    data = new FontData();
+    data->img = NULL;
+
+    for (char const *name = path; *name; name++)
+        if ((data->img = IMG_Load(name)))
+            break;
+
+    if (!data->img)
+    {
+        SDL_Quit();
+        exit(1);
+    }
+
+    glGenTextures(1, data->texture);
+    glBindTexture(GL_TEXTURE_2D, data->texture[0]);
+
+    glTexImage2D(GL_TEXTURE_2D, 0, 4, data->img->w, data->img->h, 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, data->img->pixels);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+}
+
+Font::~Font()
+{
+    glDeleteTextures(1, data->texture);
+    SDL_FreeSurface(data->img);
+
+    delete data;
+}
+
+void Font::Print(int x, int y, char const *str)
+{
+    int w = data->img->w / 16;
+    int h = data->img->h / 16;
+
+    glBindTexture(GL_TEXTURE_2D, data->texture[0]);
+    glBegin(GL_QUADS);
+    while (*str)
+    {
+        uint32_t ch = (uint8_t)*str++;
+        float tx = .0625f * (ch & 0xf);
+        float ty = .0625f * ((ch >> 4) & 0xf);
+
+        glTexCoord2f(tx, ty);
+        glVertex2f(x, y);
+        glTexCoord2f(tx + .0625f, ty);
+        glVertex2f(x + w, y);
+        glTexCoord2f(tx + .0625f, ty + .0625f);
+        glVertex2f(x + w, y + h);
+        glTexCoord2f(tx, ty + .0625f);
+        glVertex2f(x, y + h);
+
+        x += w;
+    }
+    glEnd();
+}
+

src/font.h

@@ -0,0 +1,24 @@
+
+/*
+ * The font object
+ */
+
+#if !defined __DH_FONT_H__
+#define __DH_FONT_H__
+
+class FontData;
+
+class Font
+{
+public:
+    Font(char const *path);
+    ~Font();
+
+    void Print(int x, int y, char const *str);
+
+private:
+    FontData *data;
+};
+
+#endif // __DH_FONT_H__
+

src/game.cpp

@@ -1,6 +1,9 @@
 
+#include <cstdio>
+
 #include "game.h"
 #include "map.h"
+#include "font.h"
 
 /*
  * Game implementation class
@@ -12,8 +15,11 @@ class GameData
 
 private:
     Map *map;
+    Font *font;
     int x, y;
     int mousex, mousey;
+
+    int frame;
 };
 
 /*
@@ -24,11 +30,14 @@ Game::Game(char const *mapname)
 {
     data = new GameData();
     data->map = new Map(mapname);
+    data->font = new Font("gfx/font/ascii.png");
     data->x = data->y = 0;
+    data->frame = 0;
 }
 
 Game::~Game()
 {
+    delete data->font;
     delete data->map;
     delete data;
 }
@@ -47,5 +56,9 @@ void Game::Render()
 
     scene->Render();
     delete scene;
+
+    char buf[1024];
+    sprintf(buf, "Frame %i", data->frame++);
+    data->font->Print(10, 10, buf);
 }
 

src/tileset.cpp

@@ -39,6 +39,7 @@ private:
     int *tiles;
     int ntiles;
 
+    SDL_Surface *img;
     GLuint texture[1];
 };
 
@@ -48,20 +49,18 @@ private:
 
 TileSet::TileSet(char const *path)
 {
-    SDL_Surface *img = NULL;
-
     data = new TileSetData();
     data->name = strdup(path);
     data->ref = 0;
     data->tiles = NULL;
     data->ntiles = 0;
+    data->img = NULL;
 
-    /* One tile texture */
     for (char const *name = path; *name; name++)
-        if ((img = IMG_Load(name)))
+        if ((data->img = IMG_Load(name)))
             break;
 
-    if (!img)
+    if (!data->img)
     {
         SDL_Quit();
         exit(1);
@@ -70,8 +69,8 @@ TileSet::TileSet(char const *path)
     glGenTextures(1, data->texture);
     glBindTexture(GL_TEXTURE_2D, data->texture[0]);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, 4, img->w, img->h, 0,
-                 GL_RGBA, GL_UNSIGNED_BYTE, img->pixels);
+    glTexImage2D(GL_TEXTURE_2D, 0, 4, data->img->w, data->img->h, 0,
+                 GL_RGBA, GL_UNSIGNED_BYTE, data->img->pixels);
 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);