sync: user's Lity3D_source.zip changes

- Engine core: improved initialization and lifecycle
- Renderer: camera and rendering pipeline updates
- Editor: updated editor code
- Window: improved window handling
- Demo/main.c: scene demo with AssetManager + scene loading
- build.bat: updated build script
- 11 files modified from user's manual edits

Engine/Rendering/renderer.c

@@ -1,4 +1,5 @@
 #include "renderer.h"
+#include "../Core/logger.h"
 #include <stdlib.h>
 #include <string.h>
 
@@ -22,6 +23,8 @@ Renderer* renderer_create(GraphicsDevice* device) {
     r->light_dir = (Vec3){0.5f, -1.0f, 0.3f};
     r->light_color = (Vec4){1,1,1,1};
     r->ambient_color = (Vec4){0.2f,0.2f,0.3f,1};
+    r->clear_color[0] = 0.1f; r->clear_color[1] = 0.1f;
+    r->clear_color[2] = 0.15f; r->clear_color[3] = 1.0f;
     return r;
 }
 
@@ -29,7 +32,7 @@ void renderer_destroy(Renderer* r) { free(r); }
 
 void renderer_begin_frame(Renderer* r) {
     ID3D11DeviceContext* ctx = r->device->context;
-    graphics_device_clear(r->device, 0.1f, 0.1f, 0.15f, 1.0f);
+    graphics_device_clear(r->device, r->clear_color[0], r->clear_color[1], r->clear_color[2], r->clear_color[3]);
     D3D11_VIEWPORT vp = {0};
     vp.Width = (float)r->device->width;
     vp.Height = (float)r->device->height;
@@ -43,17 +46,15 @@ void renderer_end_frame(Renderer* r) {
 }
 
 void renderer_draw_mesh(Renderer* r, Mesh* m) {
-    if (!m) return;
+    if (!r || !m || m->icount == 0) return;
+    if (!m->vb) { LOG_ERROR("renderer_draw_mesh: null vertex buffer"); return; }
+    if (!m->ib) { LOG_ERROR("renderer_draw_mesh: null index buffer"); return; }
     ID3D11DeviceContext* ctx = r->device->context;
     UINT stride = sizeof(Vertex);
     UINT offset = 0;
     ctx->lpVtbl->IASetVertexBuffers(ctx, 0, 1, &m->vb, &stride, &offset);
-    if (m->ib) {
-        ctx->lpVtbl->IASetIndexBuffer(ctx, m->ib, DXGI_FORMAT_R32_UINT, 0);
-        ctx->lpVtbl->DrawIndexed(ctx, m->icount, 0, 0);
-    } else {
-        ctx->lpVtbl->Draw(ctx, m->vcount, 0);
-    }
+    ctx->lpVtbl->IASetIndexBuffer(ctx, m->ib, DXGI_FORMAT_R32_UINT, 0);
+    ctx->lpVtbl->DrawIndexed(ctx, m->icount, 0, 0);
 }
 
 void renderer_draw_mesh_with_shader(Renderer* r, Mesh* m, Shader* s, const Mat4* world, Texture* t) {
@@ -98,8 +99,18 @@ void renderer_draw_mesh_with_material(Renderer* r, Mesh* m, Material* mat, const
 void renderer_set_view(Renderer* r, const Mat4* v) { r->view = *v; }
 void renderer_set_projection(Renderer* r, const Mat4* p) { r->projection = *p; }
 void renderer_set_light(Renderer* r, Vec3 d, Vec4 c, Vec4 a) { r->light_dir=d; r->light_color=c; r->ambient_color=a; }
+void renderer_set_clear_color(Renderer* r, float rc, float g, float b, float a) {
+    if (!r) return;
+    r->clear_color[0] = rc; r->clear_color[1] = g;
+    r->clear_color[2] = b; r->clear_color[3] = a;
+}
 GraphicsDevice* renderer_get_device(Renderer* r) { return r ? r->device : NULL; }
 
+void renderer_get_view_projection(const Renderer* r, Mat4* out) {
+    if (!r || !out) return;
+    mat4_multiply(&r->view, &r->projection, out);
+}
+
 void renderer_resize(Renderer* r, int width, int height) {
     if (r && r->device && width > 0 && height > 0) {
         graphics_device_resize(r->device, width, height);