Big initial commit: States, simulation, presentation, menus, some art.

src/shared/grid.c

@@ -0,0 +1,63 @@
+#include "grid.h"
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define GRID_MIN_WIDTH 8
+#define GRID_MIN_HEIGHT 8
+
+bool grid_initialize(Grid *grid, uint16_t width, uint16_t height) {
+    assert(grid != NULL);
+
+    if(width < GRID_MIN_WIDTH || height < GRID_MIN_HEIGHT) {
+        return false;
+    }
+
+    grid->width = width;
+    grid->height = height;
+    grid->cells = calloc(width * height, sizeof(Grid_Cell));
+    return true;
+}
+
+void grid_dispose(Grid *grid) {
+    assert(grid != NULL);
+    
+    free(grid->cells);
+    memset(grid, 0, sizeof(Grid));
+}
+
+static bool to_grid_index(Grid *grid, uint16_t x, uint16_t y, uint16_t *out_grid_index) {
+    assert(grid != NULL);
+    assert(out_grid_index != NULL);
+
+    if (!grid || !out_grid_index) return false;
+    if (x >= grid->width || y >= grid->height) return false;
+
+    *out_grid_index = y * grid->width + x;
+    return true;
+}
+
+static bool from_grid_index(Grid *grid, uint16_t grid_index, uint16_t *out_x, uint16_t *out_y) {
+    assert(grid != NULL);
+    assert(out_x != NULL);
+    assert(out_y != NULL);
+
+    if (!grid || !out_x || !out_y) return false;
+    if (grid_index >= grid->width * grid->height) return false;
+
+    *out_x = grid_index % grid->width;
+    *out_y = grid_index / grid->width;
+    return true;
+}
+
+Grid_Cell *grid_get_cell(Grid *grid, uint16_t x, uint16_t y) {
+    assert(grid != NULL);
+    if(x >= grid->width || y >= grid->height) return NULL;
+
+    uint16_t grid_index = 0;
+    if(!to_grid_index(grid, x, y, &grid_index)) {
+        return NULL;
+    }
+    
+    return &grid->cells[grid_index];
+}