Add GLES2 2D renderer + Linux display manager

First implementation with Linux display manager.

- Add single-threaded mode for EditorResourcePreview (needed for OpenGL).

Co-authored-by: clayjohn <claynjohn@gmail.com>
Co-authored-by: Fabio Alessandrelli <fabio.alessandrelli@gmail.com>

1 files changed, 112 insertions, 0 deletions

diff --git a/drivers/gles2/texture_loader_gles2.cpp b/drivers/gles2/texture_loader_gles2.cpp
new file mode 100644
index 0000000000..3878b40c19
--- /dev/null
+++ b/drivers/gles2/texture_loader_gles2.cpp
@@ -0,0 +1,112 @@
+/*************************************************************************/
+/*  texture_loader_gles2.cpp                                             */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "texture_loader_gles2.h"
+#ifdef GLES2_BACKEND_ENABLED
+
+#include "core/io/file_access.h"
+#include "core/string/print_string.h"
+
+#include <string.h>
+
+RES ResourceFormatGLES2Texture::load(const String &p_path, const String &p_original_path, Error *r_error, bool p_use_sub_threads, float *r_progress, bool p_no_cache) {
+	unsigned int width = 8;
+	unsigned int height = 8;
+
+	//We just use some format
+	Image::Format fmt = Image::FORMAT_RGB8;
+	int rowsize = 3 * width;
+
+	Vector<uint8_t> dstbuff;
+
+	dstbuff.resize(rowsize * height);
+
+	uint8_t **row_p = memnew_arr(uint8_t *, height);
+
+	for (unsigned int i = 0; i < height; i++) {
+		row_p[i] = 0; //No colors any more, I want them to turn black
+	}
+
+	memdelete_arr(row_p);
+
+	Ref<Image> img = memnew(Image(width, height, 0, fmt, dstbuff));
+
+	Ref<ImageTexture> texture = memnew(ImageTexture);
+	texture->create_from_image(img);
+
+	if (r_error)
+		*r_error = OK;
+
+	return texture;
+}
+
+void ResourceFormatGLES2Texture::get_recognized_extensions(List<String> *p_extensions) const {
+	p_extensions->push_back("bmp");
+	p_extensions->push_back("dds");
+	p_extensions->push_back("exr");
+	p_extensions->push_back("jpeg");
+	p_extensions->push_back("jpg");
+	p_extensions->push_back("hdr");
+	p_extensions->push_back("pkm");
+	p_extensions->push_back("png");
+	p_extensions->push_back("pvr");
+	p_extensions->push_back("svg");
+	p_extensions->push_back("svgz");
+	p_extensions->push_back("tga");
+	p_extensions->push_back("webp");
+}
+
+bool ResourceFormatGLES2Texture::handles_type(const String &p_type) const {
+	return ClassDB::is_parent_class(p_type, "Texture2D");
+}
+
+String ResourceFormatGLES2Texture::get_resource_type(const String &p_path) const {
+	String extension = p_path.get_extension().to_lower();
+	if (
+			extension == "bmp" ||
+			extension == "dds" ||
+			extension == "exr" ||
+			extension == "jpeg" ||
+			extension == "jpg" ||
+			extension == "hdr" ||
+			extension == "pkm" ||
+			extension == "png" ||
+			extension == "pvr" ||
+			extension == "svg" ||
+			extension == "svgz" ||
+			extension == "tga" ||
+			extension == "webp") {
+		return "ImageTexture";
+	}
+
+	return "";
+}
+
+#endif