Add project source code

3 files changed, 111 insertions, 0 deletions

diff --git a/src/terrain/CMakeLists.txt b/src/terrain/CMakeLists.txt
new file mode 100644
index 0000000..c74de94
--- /dev/null
+++ b/src/terrain/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(terrain "src/terrain.c")
+target_include_directories(terrain PUBLIC "inc")
+target_link_libraries(terrain PUBLIC container camera gfx)
diff --git a/src/terrain/inc/terrain.h b/src/terrain/inc/terrain.h
new file mode 100644
index 0000000..9552555
--- /dev/null
+++ b/src/terrain/inc/terrain.h
@@ -0,0 +1,41 @@
+#ifndef TERRAIN_H
+#define TERRAIN_H
+
+#include <camera.h>
+#include <gfx.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+enum
+{
+    MAP_TILES = 64,
+    TERRAIN_SZ = 32,
+    MAP_X = MAP_TILES * TERRAIN_SZ,
+    MAP_Y = MAP_TILES * TERRAIN_SZ
+};
+
+enum terrain_type
+{
+    TERRAIN_TYPE_GRASS
+};
+
+struct terrain_map
+{
+    enum terrain_type m[MAP_TILES][MAP_TILES];
+    int nx, ny;
+};
+
+void terrain_init(struct terrain_map *map);
+int terrain_render(const struct terrain_map *map, const struct camera *cam);
+
+extern struct sprite grass_sprite;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* TERRAIN_H */
diff --git a/src/terrain/src/terrain.c b/src/terrain/src/terrain.c
new file mode 100644
index 0000000..04df6e6
--- /dev/null
+++ b/src/terrain/src/terrain.c
@@ -0,0 +1,67 @@
+#include <terrain.h>
+#include <camera.h>
+#include <gfx.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct sprite grass_sprite;
+
+int terrain_render(const struct terrain_map *const map,
+    const struct camera *const cam)
+{
+    const int start_x = abs(cam->x / TERRAIN_SZ),
+        start_y = abs(cam->y / TERRAIN_SZ);
+
+    const int remx = cam->x % TERRAIN_SZ,
+        remy = cam->y % TERRAIN_SZ;
+
+    int nx = map->nx, ny = map->ny;
+
+    if (abs(remx) >= TERRAIN_SZ / 2)
+        nx++;
+
+    if (abs(remy) >= TERRAIN_SZ / 2)
+        ny++;
+
+    struct m
+    {
+        size_t i;
+        int p;
+    };
+
+    for (struct m x = {.i = start_x, .p = remx};
+            x.i < nx + start_x; x.i++, x.p += TERRAIN_SZ)
+        for (struct m y = {.i = start_y, .p = remy};
+            y.i < ny + start_y; y.i++, y.p += TERRAIN_SZ)
+        {
+            struct sprite *const s = sprite_get();
+
+            if (!s)
+                return -1;
+
+            switch (map->m[y.i][x.i])
+            {
+                case TERRAIN_TYPE_GRASS:
+                    if (sprite_clone(&grass_sprite, s))
+                        return -1;
+
+                    break;
+            }
+
+            s->x = x.p;
+            s->y = y.p;
+            sprite_sort(s);
+        }
+
+    return 0;
+}
+
+void terrain_init(struct terrain_map *const map)
+{
+    const int extra = !!(screen_w % TERRAIN_SZ);
+
+    memset(map, 0, sizeof *map);
+    map->nx = screen_w / TERRAIN_SZ + extra;
+    map->ny = screen_h / TERRAIN_SZ + extra;
+}