extend to support rendering to RenderTarget/OpenGL texture on Linux

ios/include/material/UnlitMaterialProvider.hpp

@@ -0,0 +1,47 @@
+#ifndef UNLIT_MATERIAL_PROVIDER
+#define UNLIT_MATERIAL_PROVIDER
+namespace polyvox {
+  class UnlitMaterialProvider : public MaterialProvider {
+
+      const Material* _m;
+      const Material* _ms[1];
+
+      public:
+        UnlitMaterialProvider(Engine* engine) {
+          _m = Material::Builder()
+            .package(	UNLITOPAQUE_UNLIT_OPAQUE_DATA, UNLITOPAQUE_UNLIT_OPAQUE_SIZE)
+            .build(*engine);
+          _ms[0] = _m;
+        }
+
+        filament::MaterialInstance* createMaterialInstance(MaterialKey* config, UvMap* uvmap,
+                const char* label = "material", const char* extras = nullptr) {
+                  MaterialInstance* d = (MaterialInstance*)_m->getDefaultInstance();
+          return d;
+        }
+
+        /**
+        * Gets a weak reference to the array of cached materials.
+        */
+        const filament::Material* const* getMaterials() const noexcept {
+          return _ms;
+        }
+
+        /**
+        * Gets the number of cached materials.
+        */
+        size_t getMaterialsCount() const noexcept {
+          return (size_t)1;
+        }
+
+        void destroyMaterials() {
+
+        }
+
+        bool needsDummyData(filament::VertexAttribute attrib) const noexcept {
+          return true;
+        }
+  };
+}
+
+#endif

ios/include/material/image_material.S

@@ -8,5 +8,5 @@ IMAGE_MATERIAL_PACKAGE:
 IMAGE_MATERIAL_IMAGE_OFFSET:
     .int 0
 IMAGE_MATERIAL_IMAGE_SIZE:
-    .int 29215
+    .int 14141
 

ios/include/material/image_material.apple.S

@@ -8,5 +8,5 @@ _IMAGE_MATERIAL_PACKAGE:
 _IMAGE_MATERIAL_IMAGE_OFFSET:
     .int 0
 _IMAGE_MATERIAL_IMAGE_SIZE:
-    .int 29215
+    .int 14141