Add text

assets.h

@@ -588,4 +588,85 @@ uint8_t SFG_backgrounds[][SFG_TEXTURE_SIZE * SFG_TEXTURE_SIZE] =
   }
 };
 
+uint8_t SFG_charToFontIndex(char c)
+{
+  if (c >= 'a' && c <= 'z')
+    return c - 'a';
+
+  if (c >= 'A' && c <= 'Z')
+    return c - 'A';
+
+  if (c >= '0' && c <= '9')
+    return c - '0';
+
+  switch (c)
+  {
+    case ' ': return 26; break;
+    case '.': return 27; break;
+    case ',': return 28; break;
+    case '!': return 29; break;
+    case '/': return 41; break;
+    case '-': return 42; break;
+    case '+': return 43; break;
+    case '(': return 44; break;
+    case ')': return 45; break;
+    case '%': return 46; break;
+    default:  return 30; break; // "?"
+  }
+}
+
+/**
+  4x4 font, each character stored as 16 bits.
+*/
+SFG_PROGRAM_MEMORY uint16_t SFG_font[47] =
+{
+  0xfaf0, // 0 "A"
+  0xfd70, // 1 "B"
+  0x6990, // 2 "C"
+  0xf960, // 3 "D"
+  0xfd90, // 4 "E"
+  0xfa80, // 5 "F"
+  0x69b0, // 6 "G"
+  0xf4f0, // 7 "H"
+  0x9f90, // 8 "I"
+  0x31f0, // 9 "J"
+  0xf4b0, // 10 "K"
+  0xf110, // 11 "L"
+  0xfc4f, // 12 "M"
+  0xf42f, // 13 "N"
+  0x6996, // 14 "O"
+  0xfae0, // 15 "P"
+  0x69b7, // 16 "Q"
+  0xfad0, // 17 "R"
+  0x5da0, // 18 "S"
+  0x8f80, // 19 "T"
+  0xf1f0, // 20 "U"
+  0xe1e0, // 21 "V"
+  0xf32f, // 22 "W"
+  0x9690, // 23 "X"
+  0xc7c0, // 24 "Y"
+  0xbd90, // 25 "Z"
+  0x0000, // 26 " "
+  0x0100, // 27 "."
+  0x0300, // 28 ","
+  0x0d00, // 29 "!"
+  0x48b4, // 30 "?"
+  0xf9f0, // 31 "0"
+  0x9f10, // 32 "1"
+  0xbdd0, // 33 "2"
+  0x9da0, // 34 "3"
+  0xe2f0, // 35 "4"
+  0xdbb0, // 36 "5"
+  0xfbb0, // 37 "6"
+  0x8bc0, // 38 "7"
+  0xfdf0, // 39 "8"
+  0xddf0, // 40 "9"
+  0x1680, // 41 "/"
+  0x2220, // 42 "-"
+  0x2720, // 43 "+"
+  0x0690, // 44 "("
+  0x0960, // 45 ")"
+  0x9249  // 46 "%"
+};
+
 #endif // guard

assets/font2array.py

@@ -0,0 +1,41 @@
+# Python tool to convert font image to C bit array.
+#
+# by drummyfish
+# released under CC0 1.0.
+
+from PIL import Image
+
+imageArray = []
+paletteColors = []
+paletteArray = []
+
+image = Image.open("font.png").convert("RGB")
+pixels = image.load()
+
+column = 0
+value = 0
+index = 0
+
+result = ""
+
+chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ .,!?0123456789/-+()%"
+
+for x in range(image.size[0]):
+
+  if column == 4:
+    column = 0
+    value = 0
+    index += 1
+    continue 
+
+  for y in range(image.size[1]):
+    value = value * 2 + (1 if pixels[x,y][0] < 128 else 0)
+
+  if column == 3:
+    result += "  0x" + hex(value)[2:].zfill(4) + ", // " + str(index) + " \"" + chars[index] + "\"\n"
+
+  column += 1
+
+result = "{\n" + result + "}";
+
+print(result)

main.c

@@ -1013,6 +1013,62 @@ void SFG_drawMap()
   } 
 }
 
+/**
+  Draws text on screen using the bitmap font stored in assets.
+*/
+void SFG_drawText(
+  const char *text,
+  uint16_t x,
+  uint16_t y,
+  uint8_t size,
+  uint8_t color)
+{
+  uint16_t pos = 0;
+
+  uint16_t currentX = x;
+  uint16_t currentY = y;
+
+  while (text[pos] != 0)
+  {
+    uint16_t character = SFG_font[SFG_charToFontIndex(text[pos])];
+
+    for (uint8_t i = 0; i < 4; ++i)
+    {
+      currentY = y;
+
+      for (uint8_t j = 0; j < 4; ++j)
+      {
+        if (character & 0x8000)
+          for (uint8_t k = 0; k < size; ++k)
+            for (uint8_t l = 0; l < size; ++l)
+            {
+              uint16_t drawX = currentX + k;
+              uint16_t drawY = currentY + l;
+
+              if (drawX >= 0 && drawX < SFG_GAME_RESOLUTION_X &&
+                  drawY >= 0 && drawY < SFG_GAME_RESOLUTION_Y)
+                SFG_setGamePixel(drawX,drawY,color);
+            }
+
+        currentY += size;
+        character = character << 1;
+      }
+
+      currentX += size;
+
+      if (currentX >= SFG_GAME_RESOLUTION_X)
+        break;
+    }
+    
+    currentX += size;
+      
+    if (currentX >= SFG_GAME_RESOLUTION_X)
+      break;
+
+    pos++;    
+  }
+}
+
 void SFG_draw()
 {
   if (SFG_keyPressed(SFG_KEY_MAP))
@@ -1073,6 +1129,8 @@ void SFG_draw()
     // substract head bob after rendering
     SFG_player.camera.height -= headBobOffset;
 #endif
+
+SFG_drawText("test text!",10,20,3,7);
   }
 }