Chapter 31: Software Drawing and Graphical Gameslinear-chapter31linear

Co-authored-by: Hsiang-Ying Fu <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: fuhsnn <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: Symious <14933944+symious@users.noreply.github.com>
Co-authored-by: Jun Kawasaki <jun784@gmail.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/src/main/c/simple_audio.c b/src/main/c/simple_audio.c
new file mode 100644
index 00000000..b8ed62de
--- /dev/null
+++ b/src/main/c/simple_audio.c
@@ -0,0 +1,40 @@
+#include "simple_audio.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+
+static const struct simple_audio_api *api;
+static void *library;
+
+int32_t simple_audio_open(void) {
+    const char *path = getenv("SIMPLE_MINIAUDIO");
+    if (path && strcmp(path,"off")==0) return -1;
+    if (!api) {
+        if (!path || !*path) return -1; // Optional: games may run silently.
+        library = dlopen(path,RTLD_NOW | RTLD_LOCAL);
+        if (!library) {
+            fprintf(stderr,"Simple audio: cannot load backend '%s': %s\n",path,dlerror());
+            return -1;
+        }
+        const struct simple_audio_api *(*get_api)(void) =
+            (const struct simple_audio_api *(*)(void))dlsym(library,"simple_miniaudio_api");
+        const struct simple_audio_api *candidate = get_api ? get_api() : NULL;
+        if (!candidate || candidate->version!=SIMPLE_AUDIO_VERSION || !candidate->open ||
+            !candidate->load || !candidate->play || !candidate->stop ||
+            !candidate->playing || !candidate->close) {
+            fprintf(stderr,"Simple audio: incompatible backend; rebuild with make audio.\n");
+            dlclose(library);
+            library=NULL;
+            return -1;
+        }
+        api=candidate;
+        atexit(api->close);
+    }
+    return api->open();
+}
+int32_t simple_audio_load(const int16_t *samples, uint32_t count) { return api ? api->load(samples,count) : -1; }
+int32_t simple_audio_play(int32_t sound) { return api ? api->play(sound) : -1; }
+int32_t simple_audio_stop(void) { return api ? api->stop() : 0; }
+int32_t simple_audio_playing(void) { return api ? api->playing() : 0; }
+int32_t simple_audio_close(void) { if (api) api->close(); return 0; }