Implement black margins in GLES2, which was missing, fixes #24556

drivers/gles2/rasterizer_canvas_gles2.cpp

@@ -1733,6 +1733,64 @@ void RasterizerCanvasGLES2::draw_lens_distortion_rect(const Rect2 &p_rect, float
 }
 
 void RasterizerCanvasGLES2::draw_window_margins(int *black_margin, RID *black_image) {
+
+	Vector2 window_size = OS::get_singleton()->get_window_size();
+	int window_h = window_size.height;
+	int window_w = window_size.width;
+
+	glBindFramebuffer(GL_FRAMEBUFFER, storage->system_fbo);
+	glViewport(0, 0, window_size.width, window_size.height);
+	canvas_begin();
+
+	if (black_image[MARGIN_LEFT].is_valid()) {
+		_bind_canvas_texture(black_image[MARGIN_LEFT], RID());
+		Size2 sz(storage->texture_get_width(black_image[MARGIN_LEFT]), storage->texture_get_height(black_image[MARGIN_LEFT]));
+		draw_generic_textured_rect(Rect2(0, 0, black_margin[MARGIN_LEFT], window_h), Rect2(0, 0, sz.x, sz.y));
+	} else if (black_margin[MARGIN_LEFT]) {
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, storage->resources.black_tex);
+
+		draw_generic_textured_rect(Rect2(0, 0, black_margin[MARGIN_LEFT], window_h), Rect2(0, 0, 1, 1));
+	}
+
+	if (black_image[MARGIN_RIGHT].is_valid()) {
+		_bind_canvas_texture(black_image[MARGIN_RIGHT], RID());
+		Size2 sz(storage->texture_get_width(black_image[MARGIN_RIGHT]), storage->texture_get_height(black_image[MARGIN_RIGHT]));
+		draw_generic_textured_rect(Rect2(window_w - black_margin[MARGIN_RIGHT], 0, black_margin[MARGIN_RIGHT], window_h), Rect2(0, 0, sz.x, sz.y));
+	} else if (black_margin[MARGIN_RIGHT]) {
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, storage->resources.black_tex);
+
+		draw_generic_textured_rect(Rect2(window_w - black_margin[MARGIN_RIGHT], 0, black_margin[MARGIN_RIGHT], window_h), Rect2(0, 0, 1, 1));
+	}
+
+	if (black_image[MARGIN_TOP].is_valid()) {
+		_bind_canvas_texture(black_image[MARGIN_TOP], RID());
+
+		Size2 sz(storage->texture_get_width(black_image[MARGIN_TOP]), storage->texture_get_height(black_image[MARGIN_TOP]));
+		draw_generic_textured_rect(Rect2(0, 0, window_w, black_margin[MARGIN_TOP]), Rect2(0, 0, sz.x, sz.y));
+
+	} else if (black_margin[MARGIN_TOP]) {
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, storage->resources.black_tex);
+
+		draw_generic_textured_rect(Rect2(0, 0, window_w, black_margin[MARGIN_TOP]), Rect2(0, 0, 1, 1));
+	}
+
+	if (black_image[MARGIN_BOTTOM].is_valid()) {
+
+		_bind_canvas_texture(black_image[MARGIN_BOTTOM], RID());
+
+		Size2 sz(storage->texture_get_width(black_image[MARGIN_BOTTOM]), storage->texture_get_height(black_image[MARGIN_BOTTOM]));
+		draw_generic_textured_rect(Rect2(0, window_h - black_margin[MARGIN_BOTTOM], window_w, black_margin[MARGIN_BOTTOM]), Rect2(0, 0, sz.x, sz.y));
+
+	} else if (black_margin[MARGIN_BOTTOM]) {
+
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, storage->resources.black_tex);
+
+		draw_generic_textured_rect(Rect2(0, window_h - black_margin[MARGIN_BOTTOM], window_w, black_margin[MARGIN_BOTTOM]), Rect2(0, 0, 1, 1));
+	}
 }
 
 void RasterizerCanvasGLES2::initialize() {