extend to support rendering to RenderTarget/OpenGL texture on Linux

linux/include/polyvox_filament/filament_pb_texture.h

@@ -0,0 +1,44 @@
+#ifndef FILAMENT_PB_TEXTURE_H
+#define FILAMENT_PB_TEXTURE_H
+#include <gtk/gtk.h>
+#include <glib-object.h>
+#include <flutter_linux/flutter_linux.h>
+#include <flutter_linux/fl_texture_gl.h>
+#include <flutter_linux/fl_texture.h>
+#include <flutter_linux/fl_pixel_buffer_texture.h>
+#include <flutter_linux/fl_texture_registrar.h>
+
+
+#ifdef FLUTTER_PLUGIN_IMPL
+#define FLUTTER_PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define FLUTTER_PLUGIN_EXPORT
+#endif
+
+
+G_BEGIN_DECLS
+
+#define FILAMENT_PB_TEXTURE(obj) \
+   (G_TYPE_CHECK_INSTANCE_CAST((obj), filament_pb_texture_get_type(), \
+                               FilamentPBTexture))
+
+struct _FilamentPBTexture {
+    FlPixelBufferTexture parent_instance;
+};
+
+typedef struct _FilamentPBTexture FilamentPBTexture;
+typedef struct {
+  FlPixelBufferTextureClass parent_instance;
+  gboolean (*copy_pixels)(FlPixelBufferTexture* texture,
+                          const uint8_t** buffer,
+                          uint32_t* width,
+                          uint32_t* height,
+                          GError** error);
+
+} FilamentPBTextureClass;
+
+G_END_DECLS
+
+FLUTTER_PLUGIN_EXPORT FlTexture* create_filament_pb_texture(uint32_t width, uint32_t height, FlTextureRegistrar* registrar);
+
+#endif 

linux/include/polyvox_filament/filament_texture.h

@@ -0,0 +1,48 @@
+#ifndef FILAMENT_TEXTURE_H
+#define FILAMENT_TEXTURE_H
+#include <gtk/gtk.h>
+#include <glib-object.h>
+#include <flutter_linux/flutter_linux.h>
+#include <flutter_linux/fl_texture_gl.h>
+#include <flutter_linux/fl_texture.h>
+#include <flutter_linux/fl_texture_registrar.h>
+
+
+#ifdef FLUTTER_PLUGIN_IMPL
+#define FLUTTER_PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define FLUTTER_PLUGIN_EXPORT
+#endif
+
+
+G_BEGIN_DECLS
+
+#define FILAMENT_TEXTURE_GL(obj) \
+   (G_TYPE_CHECK_INSTANCE_CAST((obj), filament_texture_gl_get_type(), \
+                               FilamentTextureGL))
+
+struct _FilamentTextureGL {
+    FlTextureGL parent_instance;
+    GLuint texture_id;
+    uint32_t width;
+    uint32_t height;
+};
+
+typedef struct _FilamentTextureGL FilamentTextureGL;
+typedef struct {
+  FlTextureGLClass parent_instance;
+  gboolean (*populate)(FlTextureGL* texture,
+                       uint32_t* target,
+                       uint32_t* name,
+                       uint32_t* width,
+                       uint32_t* height,
+                       GError** error);
+
+  GLuint texture_id;
+} FilamentTextureGLClass;
+
+G_END_DECLS
+
+FLUTTER_PLUGIN_EXPORT FlTexture* create_filament_texture(uint32_t width, uint32_t height, FlTextureRegistrar* registrar);
+
+#endif 

linux/include/polyvox_filament/polyvox_filament_plugin.h

@@ -2,6 +2,7 @@
 #define FLUTTER_PLUGIN_POLYVOX_FILAMENT_PLUGIN_H_
 
 #include <flutter_linux/flutter_linux.h>
+#include <epoxy/gl.h>
 
 G_BEGIN_DECLS