Full support for high-DPI displays on all platforms (tmewett#207)

Tiles (fonts and graphics) are now regenerated from a high-resolution
image every time the window is resized. This allows us to perfectly
fit the scene into the window, leaving no black padding on the sides.

To access all pixels in a HiDPI setting, we also switched from
rendering surfaces with `SDL_UpdateWindowSurface`, to
rendering textures with `SDL_RenderPresent`.

Some video drivers are quite inefficient, notably in virtual machines,
so there is a new `--no-gpu` command-line parameter to disable
hardware acceleration. The software renderer does not support
HiDPI, though.

Makefile

@@ -14,7 +14,7 @@ ifeq ($(TERMINAL),YES)
 endif
 
 ifeq ($(GRAPHICS),YES)
-	sources += $(addprefix src/platform/,sdl2-platform.c)
+	sources += $(addprefix src/platform/,sdl2-platform.c tiles.c)
 	cflags += $(shell $(SDL_CONFIG) --cflags)
 	cppflags += -DBROGUE_SDL
 	libs += $(shell $(SDL_CONFIG) --libs) -lSDL2_image
@@ -51,6 +51,7 @@ windows/icon.o: windows/icon.rc
 
 bin/brogue.exe: $(objects) windows/icon.o
 	$(CC) $(cflags) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(libs) $(LDLIBS)
+	mt -manifest windows/brogue.exe.manifest -outputresource:bin/brogue.exe;1
 
 clean:
 	$(RM) src/brogue/*.o src/platform/*.o bin/brogue{,.exe}

changes/hi-dpi.md

@@ -0,0 +1 @@
+Brogue CE now supports High DPI displays on Windows, Linux and macOS (Retina).

changes/scalable-window.md

@@ -0,0 +1 @@
+The window is now freely resizable, to perfectly fit any monitor up to 4K size.

src/platform/main.c

@@ -1,3 +1,5 @@
+#include <math.h>
+#include <limits.h>
 #include "platform.h"
 
 // Expanding a macro as a string constant requires two levels of macros
@@ -6,13 +8,11 @@
 
 struct brogueConsole currentConsole;
 
-int brogueFontSize = 0;
 char dataDirectory[BROGUE_FILENAME_MAX] = STRINGIFY(DATADIR);
 boolean serverMode = false;
 boolean hasGraphics = false;
 boolean graphicsEnabled = false;
 boolean isCsvFormat = false;
-boolean initialFullScreen = false;
 
 static void printCommandlineHelp() {
     printf("%s",
@@ -27,9 +27,10 @@ static void printCommandlineHelp() {
     "--server-mode              run the game in web-brogue server mode\n"
 #endif
 #ifdef BROGUE_SDL
-    "--size N                   starts the game at font size N (1 to 13)\n"
+    "--size N                   starts the game at font size N (1 to 20)\n"
     "--graphics     -G          enable graphical tiles\n"
     "--full-screen  -F          enable full screen\n"
+    "--no-gpu                   disable hardware-accelerated graphics and HiDPI\n"
 #endif
 #ifdef BROGUE_CURSES
     "--term         -t          run in ncurses-based terminal mode\n"
@@ -180,17 +181,25 @@ int main(int argc, char *argv[])
 
 #ifdef BROGUE_SDL
         if (strcmp(argv[i], "--size") == 0) {
-            // pick a font size
-            int size = atoi(argv[i + 1]);
-            if (size != 0) {
+            if (i + 1 < argc) {
+                int size = atoi(argv[i + 1]);
+                if (size > 0 && size <= 20) {
+                    windowWidth = round(pow(1.1, size) * 620.);
+                    windowHeight = windowWidth * 9/16;
+                };
+
                 i++;
-                brogueFontSize = size;
                 continue;
-            };
+            }
         }
 
         if (strcmp(argv[i], "-F") == 0 || strcmp(argv[i], "--full-screen") == 0) {
-            initialFullScreen = true;
+            fullScreen = true;
+            continue;
+        }
+
+        if (strcmp(argv[i], "--no-gpu") == 0) {
+            softwareRendering = true;
             continue;
         }
 #endif

src/platform/platform.h

@@ -92,6 +92,10 @@ unsigned int glyphToUnicode(enum displayGlyph glyph);
 
 #ifdef BROGUE_SDL
 extern struct brogueConsole sdlConsole;
+extern int windowWidth;
+extern int windowHeight;
+extern boolean fullScreen;
+extern boolean softwareRendering;
 #endif
 
 #ifdef BROGUE_CURSES
@@ -104,9 +108,7 @@ extern struct brogueConsole webConsole;
 
 extern struct brogueConsole currentConsole;
 extern boolean noMenu;
-extern int brogueFontSize;
 extern char dataDirectory[];
-extern boolean initialFullScreen;
 
 // defined in brogue
 extern playerCharacter rogue;