fix compatibility gles3 driver loading GL_TEXTURE_2D_ARRAY and bptc r…

…gba pixel size

core/io/image.cpp

@@ -152,7 +152,7 @@ int Image::get_format_pixel_size(Format p_format) {
 		case FORMAT_RGTC_RG:
 			return 1; //bc5
 		case FORMAT_BPTC_RGBA:
-			return 1; //btpc bc6h
+			return 4; //btpc bc6h
 		case FORMAT_BPTC_RGBF:
 			return 1; //float /
 		case FORMAT_BPTC_RGBFU:

drivers/gles3/storage/texture_storage.cpp

@@ -1497,12 +1497,17 @@ void TextureStorage::_texture_set_data(RID p_texture, const Ref<Image> &p_image,
 		img->get_mipmap_offset_and_size(i, ofs, size);
 
 		if (compressed) {
-			glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+			glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 
-			int bw = w;
-			int bh = h;
+			if (texture->target == GL_TEXTURE_2D_ARRAY) {
+				if (p_initialize) {
+					glCompressedTexImage3D(GL_TEXTURE_2D_ARRAY, i, internal_format, w, h, texture->layers, 0, size, &read[ofs]);
+				}
+				glCompressedTexSubImage3D(GL_TEXTURE_2D_ARRAY, i, 0, 0, p_layer, w, h, 1, format, size, &read[ofs]);
 
-			glCompressedTexImage2D(blit_target, i, internal_format, bw, bh, 0, size, &read[ofs]);
+			} else {
+				glCompressedTexImage3D(blit_target, i, internal_format, w, h, texture->layers, 0, size, &read[ofs]);
+			}
 		} else {
 			glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 			if (texture->target == GL_TEXTURE_2D_ARRAY) {