create material for texture baking

textures can now be created manually and are no longer tracked by SceneManager (and therefore require manual tracking/disposal)

thermion_dart/native/src/c_api/TTexture.cpp

@@ -2,6 +2,7 @@
 
 #include <filament/Engine.h>
 #include <filament/Material.h>
+#include <filament/RenderTarget.h>
 #include <filament/Scene.h>
 #include <filament/Texture.h>
 #include <filament/TextureSampler.h>
@@ -36,6 +37,12 @@ namespace thermion
             return reinterpret_cast<TLinearImage *>(linearImage);
         }
 
+        EMSCRIPTEN_KEEPALIVE float *Image_getBytes(TLinearImage *tLinearImage)
+        {
+            auto *linearImage = reinterpret_cast<::image::LinearImage *>(tLinearImage);
+            return linearImage->getPixelRef();
+        }
+
         EMSCRIPTEN_KEEPALIVE uint32_t Image_getWidth(TLinearImage *tLinearImage)
         {
             auto *linearImage = reinterpret_cast<::image::LinearImage *>(tLinearImage);
@@ -98,6 +105,13 @@ namespace thermion
             return true;
         }
 
+
+        EMSCRIPTEN_KEEPALIVE TLinearImage *Image_createEmpty(uint32_t width,uint32_t height,uint32_t channel) {
+            auto *image = new ::image::LinearImage(width, height, channel);
+            return reinterpret_cast<TLinearImage*>(image);
+        }
+        
+
         EMSCRIPTEN_KEEPALIVE TTextureSampler *TextureSampler_create()
         {
             auto *sampler = new filament::TextureSampler();
@@ -217,6 +231,12 @@ namespace thermion
                 delete textureSampler;
             }
         }
+        
+        EMSCRIPTEN_KEEPALIVE TTexture *RenderTarget_getColorTexture(TRenderTarget *tRenderTarget) { 
+            auto renderTarget = reinterpret_cast<filament::RenderTarget*>(tRenderTarget);
+            auto texture = renderTarget->getTexture(filament::RenderTarget::AttachmentPoint::COLOR0);
+            return reinterpret_cast<TTexture*>(texture);
+        }
 
 #ifdef __cplusplus
     }