Publish Chimera GFX source

adapters/sdl2/README.md

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+# SDL2 renderer adapter boundary
+
+The compiled scaffold reports that no accelerated renderer exists and that the
+current PS5 window, VideoOut, input, and audio facilities must remain owned by
+SDL. Acceleration requests return `SAFETY_POLICY`; non-accelerated creation is
+`UNSUPPORTED` until the real adapter phase.
+
+The future renderer will translate SDL textures and presents to the stable
+`libchimera-gfx` resource lifecycle without replacing SDL's platform backends.
+The Phase-1 clear-frame sample is evidence for the existing SDL VideoOut route,
+not an accelerated renderer implementation.

adapters/sdl2/sdl2_adapter.c

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+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <chimera/gfx/adapters/sdl2.h>
+
+chimera_gfx_status
+chimera_gfx_sdl2_query_scaffold(chimera_gfx_sdl2_adapter_info *out_info) {
+    if (out_info == NULL || out_info->struct_size < sizeof(*out_info)) {
+        return CHIMERA_GFX_STATUS_INVALID_ARGUMENT;
+    }
+    out_info->struct_size = sizeof(*out_info);
+    out_info->api_version = CHIMERA_GFX_API_VERSION;
+    out_info->accelerated_renderer_available = 0u;
+    out_info->reuses_ps5_window_backend = 1u;
+    out_info->reuses_ps5_input_audio = 1u;
+    out_info->software_fallback_required = 1u;
+    return CHIMERA_GFX_STATUS_OK;
+}
+
+chimera_gfx_status
+chimera_gfx_sdl2_create_renderer_scaffold(chimera_gfx_context *context,
+                                          uint32_t request_acceleration) {
+    if (context == NULL) {
+        return CHIMERA_GFX_STATUS_INVALID_ARGUMENT;
+    }
+    if (request_acceleration != 0u) {
+        return CHIMERA_GFX_STATUS_SAFETY_POLICY;
+    }
+    return CHIMERA_GFX_STATUS_UNSUPPORTED;
+}