From daf6262c029892212f6b9b4014887c2c37e9ef75 Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 31 Aug 2024 18:58:39 -0700
Subject: Handle resizing.

---
 gfx-iso/demos/checkerboard/checkerboard.c | 94 +++++++++++++++++++++++--------
 1 file changed, 70 insertions(+), 24 deletions(-)

(limited to 'gfx-iso/demos/checkerboard/checkerboard.c')

diff --git a/gfx-iso/demos/checkerboard/checkerboard.c b/gfx-iso/demos/checkerboard/checkerboard.c
index e684bc3..0f01b72 100644
--- a/gfx-iso/demos/checkerboard/checkerboard.c
+++ b/gfx-iso/demos/checkerboard/checkerboard.c
@@ -1,10 +1,20 @@
-#include <isogfx/app.h>
+#include <isogfx/backend.h>
 #include <isogfx/isogfx.h>
 
+#include <gfx/app.h>
+
 #include <assert.h>
 #include <stdbool.h>
 #include <stdio.h>
 
+static const int WINDOW_WIDTH  = 1408;
+static const int WINDOW_HEIGHT = 960;
+static const int MAX_FPS       = 60;
+
+// Virtual screen dimensions.
+static const int SCREEN_WIDTH  = 704;
+static const int SCREEN_HEIGHT = 480;
+
 static const int TILE_WIDTH   = 64;
 static const int TILE_HEIGHT  = TILE_WIDTH / 2;
 static const int WORLD_WIDTH  = 20;
@@ -31,11 +41,13 @@ typedef enum Colour {
   Red,
 } Colour;
 
-typedef struct IsoGfxAppState {
-  Tile red;
-  int  xpick;
-  int  ypick;
-} IsoGfxAppState;
+typedef struct GfxAppState {
+  IsoBackend* backend;
+  IsoGfx*     iso;
+  Tile        red;
+  int         xpick;
+  int         ypick;
+} GfxAppState;
 
 static void make_checkerboard(IsoGfx* iso, Tile black, Tile white) {
   assert(iso);
@@ -49,14 +61,20 @@ static void make_checkerboard(IsoGfx* iso, Tile black, Tile white) {
   }
 }
 
-static bool init(
-    IsoGfxAppState* state, IsoGfx* iso, int argc, const char** argv) {
+static bool init(GfxAppState* state, int argc, const char** argv) {
   assert(state);
-  assert(iso);
 
   (void)argc;
   (void)argv;
 
+  if (!(state->iso = isogfx_new(&(IsoGfxDesc){
+            .screen_width = SCREEN_WIDTH, .screen_height = SCREEN_HEIGHT}))) {
+    return false;
+  }
+  IsoGfx* iso = state->iso;
+
+  isogfx_resize(iso, SCREEN_WIDTH, SCREEN_HEIGHT);
+
   if (!isogfx_make_world(
           iso, &(WorldDesc){
                    .tile_width   = TILE_WIDTH,
@@ -71,50 +89,78 @@ static bool init(
   state->red       = isogfx_make_tile(iso, &tile_set[Red]);
   make_checkerboard(iso, black, white);
 
+  if (!(state->backend = IsoBackendInit(iso))) {
+    return false;
+  }
+
   return true;
 }
 
-static void shutdown(IsoGfxAppState* state, IsoGfx* iso) {
+static void shutdown(GfxAppState* state) {
   assert(state);
-  assert(iso);
+
+  IsoBackendShutdown(&state->backend);
+  isogfx_del(&state->iso);
 }
 
-static void update(IsoGfxAppState* state, IsoGfx* iso, double t, double dt) {
+static void update(GfxAppState* state, double t, double dt) {
   assert(state);
-  assert(iso);
-
-  (void)t;
   (void)dt;
 
+  IsoGfx* iso = state->iso;
+
+  isogfx_update(iso, t);
+
+  // Get mouse position in window coordinates.
   double mouse_x, mouse_y;
   gfx_app_get_mouse_position(&mouse_x, &mouse_y);
 
+  // Map from window coordinates to virtual screen coordinates.
+  IsoBackendGetMousePosition(
+      state->backend, mouse_x, mouse_y, &mouse_x, &mouse_y);
+
   isogfx_pick_tile(iso, mouse_x, mouse_y, &state->xpick, &state->ypick);
 
   printf("Picked tile: (%d, %d)\n", state->xpick, state->ypick);
 }
 
-static void render(IsoGfxAppState* state, IsoGfx* iso) {
+static void render(GfxAppState* state) {
   assert(state);
-  assert(iso);
+
+  IsoGfx* iso = state->iso;
 
   isogfx_render(iso);
 
   if ((state->xpick != -1) && (state->ypick != -1)) {
     isogfx_draw_tile(iso, state->xpick, state->ypick, state->red);
   }
+
+  IsoBackendRender(state->backend, iso);
+}
+
+static void resize(GfxAppState* state, int width, int height) {
+  assert(state);
+
+  IsoBackendResizeWindow(state->backend, state->iso, width, height);
 }
 
 int main(int argc, const char** argv) {
-  IsoGfxAppState state = {0};
-  iso_run(
-      argc, argv,
-      &(IsoGfxApp){
-          .state    = &state,
+  GfxAppState state = {0};
+  gfx_app_run(
+      &(GfxAppDesc){
+          .argc              = argc,
+          .argv              = argv,
+          .width             = WINDOW_WIDTH,
+          .height            = WINDOW_HEIGHT,
+          .max_fps           = MAX_FPS,
+          .update_delta_time = MAX_FPS > 0 ? 1.0 / (double)MAX_FPS : 0.0,
+          .title             = "Isometric Renderer",
+          .app_state         = &state},
+      &(GfxAppCallbacks){
           .init     = init,
-          .shutdown = shutdown,
           .update   = update,
           .render   = render,
-      });
+          .resize   = resize,
+          .shutdown = shutdown});
   return 0;
 }
-- 
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