From e289e1dd67d2e1b7769bb0fdd23d064a6c596b2b Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Mon, 18 Feb 2013 17:57:14 -0500
Subject: Begin work on areas and viewports.

---
diff --git a/src/Makefile.am b/src/Makefile.am
index a117d1e..2f349b4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -7,4 +7,6 @@ src_SOURCES = \
               src/xml.c \
               src/base64.c \
               src/compression.c \
+              src/viewport.c \
+              src/area.c \
               $(src_resources_SOURCES)
diff --git a/src/area.c b/src/area.c
new file mode 100644
index 0000000..3a03198
--- /dev/null
+++ b/src/area.c
@@ -0,0 +1,50 @@
+#include <SDL.h>
+#include "area.h"
+#include "layer.h"
+#include "viewport.h"
+
+void
+render_area_to_viewport(struct area *area, struct viewport *vp)
+{
+	SDL_Rect srcrect;
+	SDL_Rect dstrect;
+
+	srcrect.x = vp->x;
+	srcrect.y = vp->y;
+	srcrect.w = vp->w;
+	srcrect.h = vp->h;
+	dstrect.x = 0;
+	dstrect.y = 0;
+	dstrect.w = vp->w;
+	dstrect.h = vp->h;
+
+	render_area_to_surface(area, &srcrect, vp->screen, &dstrect);
+}
+
+void
+render_area_to_surface(struct area *area, SDL_Rect *arearect,
+		SDL_Surface *dst, SDL_Rect *dstrect)
+{
+	/* Fast fill with black to avoid artifacts in off-map pixels. */
+	SDL_FillRect(dst, dstrect, 0);
+
+	/* Blit ground layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_GROUND], arearect,
+			dst, dstrect);
+
+	/* Blit low objects layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_OBJ_LOW], arearect,
+			dst, dstrect);
+
+	/* TODO: Blit low sprites. */
+
+	/* Blit middle objects layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_OBJ_MID], arearect,
+			dst, dstrect);
+
+	/* TODO: Blit high sprites. */
+
+	/* Blit high objects layer. */
+	SDL_BlitSurface(area->map_layers[LAYER_OBJ_HIGH], arearect,
+			dst, dstrect);
+}
diff --git a/src/area.h b/src/area.h
new file mode 100644
index 0000000..644ab16
--- /dev/null
+++ b/src/area.h
@@ -0,0 +1,16 @@
+#ifndef AREA_H
+#define AREA_H
+
+#include <SDL.h>
+#include "layer.h"
+#include "viewport.h"
+
+struct area {
+	SDL_Surface *map_layers[LAYERS_MAX];
+};
+
+void render_area_to_viewport(struct area *area, struct viewport *vp);
+void render_area_to_surface(struct area *area, SDL_Rect *arearect,
+		SDL_Surface *dst, SDL_Rect *dstrect);
+
+#endif
diff --git a/src/init.c b/src/init.c
index f893d1d..921ce6e 100644
--- a/src/init.c
+++ b/src/init.c
@@ -15,12 +15,6 @@ init(void)
 	if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG) {
 		err(1, "Failed to initialize SDL_Image (%s)", IMG_GetError());
 	}
-
-	debug("Setting video mode...");
-	screen = SDL_SetVideoMode(240, 160, 8, SDL_SWSURFACE | SDL_ANYFORMAT);
-	if (screen == NULL) {
-		err(1, "Failed to set video mode (%s)", SDL_GetError());
-	}
 }
 
 void
diff --git a/src/init.h b/src/init.h
index f04b1fe..6f13c65 100644
--- a/src/init.h
+++ b/src/init.h
@@ -3,8 +3,6 @@
 
 #include <SDL.h>
 
-SDL_Surface *screen;
-
 void init(void);
 void quit(int status);
 
diff --git a/src/layer.h b/src/layer.h
new file mode 100644
index 0000000..09ad462
--- /dev/null
+++ b/src/layer.h
@@ -0,0 +1,13 @@
+#ifndef LAYER_H
+#define LAYER_H
+
+enum layer_id {
+	LAYER_GROUND = 0,
+	LAYER_OBJ_LOW,
+	LAYER_OBJ_MID,
+	LAYER_OBJ_HIGH,
+	LAYER_WEATHER,
+	LAYERS_MAX
+};
+
+#endif
diff --git a/src/main.c b/src/main.c
index dc85590..b3ad78c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3,10 +3,12 @@
 #include "logging.h"
 #include "resources/image.h"
 #include "resources/map.h"
+#include "viewport.h"
 
 int
 main(void)
 {
+	SDL_Surface *screen;
 	struct map *map;
 	struct image *img;
 	struct map_tileset *ts;
@@ -15,6 +17,7 @@ main(void)
 	SDL_Rect imgrect, surfacerect;
 
 	init();
+	screen = init_viewport(240, 160, 8)->screen;
 
 	map = map_get("data/forest1.tmx");
 	debug("Map dimensions: %dx%d", map->width, map->height);
diff --git a/src/viewport.c b/src/viewport.c
new file mode 100644
index 0000000..97e73dd
--- /dev/null
+++ b/src/viewport.c
@@ -0,0 +1,28 @@
+#include <SDL.h>
+#include "viewport.h"
+#include "logging.h"
+
+struct viewport *
+init_viewport(int width, int height, int bpp)
+{
+	struct viewport *vp;
+
+	vp = malloc(sizeof(*vp));
+	if (vp == NULL) {
+		err(1, "Failed to allocate viewport");
+	}
+
+	vp->x = 0;
+	vp->y = 0;
+	vp->w= width;
+	vp->h= height;
+
+	debug("Setting video mode...");
+	vp->screen = SDL_SetVideoMode(width, height, bpp,
+			SDL_SWSURFACE | SDL_ANYFORMAT);
+	if (vp->screen == NULL) {
+		err(1, "Failed to set video mode (%s)", SDL_GetError());
+	}
+
+	return vp;
+}
diff --git a/src/viewport.h b/src/viewport.h
new file mode 100644
index 0000000..372a285
--- /dev/null
+++ b/src/viewport.h
@@ -0,0 +1,16 @@
+#ifndef VIEWPORT_H
+#define VIEWPORT_H
+
+#include <SDL.h>
+
+struct viewport {
+	int x;
+	int y;
+	int w;
+	int h;
+	SDL_Surface *screen;
+};
+
+struct viewport *init_viewport(int width, int height, int bpp);
+
+#endif
--
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