OPENGL: Add TiledSurface to be used for drawing large 2D surfaces

2016-06-19 07:35:45 +02:00 · 2016-06-19 07:35:45 +02:00 · b718d86a6f
commit b718d86a6f
parent 287f97228f
3 changed files with 244 additions and 0 deletions
--- a/graphics/opengl/tiledsurface.h
+++ b/graphics/opengl/tiledsurface.h
@ -0,0 +1,118 @@
+/* ResidualVM - A 3D game interpreter
+ *
+ * ResidualVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef GRAPHICS_OPENGL_TILED_SURFACE_H
+#define GRAPHICS_OPENGL_TILED_SURFACE_H
+
+#include "graphics/opengl/system_headers.h"
+
+#include "common/array.h"
+#include "common/rect.h"
+
+#include "graphics/surface.h"
+
+namespace OpenGL {
+
+class Texture;
+class SurfaceRenderer;
+
+/**
+ * Surface implementation using OpenGL texture tiles
+ */
+class TiledSurface {
+public:
+	TiledSurface(uint width, uint height, const Graphics::PixelFormat &pixelFormat);
+	~TiledSurface();
+
+	/**
+	 * Copy image data to the surface.
+	 *
+	 * The format of the input data needs to match the format returned by
+	 * getFormat.
+	 * This does not immediatly updates the textures.
+	 *
+	 * @param x        X coordinate of upper left corner to copy data to.
+	 * @param y        Y coordinate of upper left corner to copy data to.
+	 * @param w        Width of the image data to copy.
+	 * @param h        Height of the image data to copy.
+	 * @param src      Pointer to image data.
+	 * @param srcPitch The number of bytes in a row of the image data.
+	 */
+	void copyRectToSurface(const void *src, int srcPitch, int x, int y, int w, int h);
+
+	/**
+	 * Update the OpenGL textures from the backing surface
+	 */
+	void update();
+
+	/**
+	 * Draw as a 2D surface
+	 *
+	 * The destination rect is as follow :
+	 * x: left [0.0, 1.0] right
+	 * y: top [0.0, 1.0] bottom
+	 *
+	 * @param surfaceRenderer
+	 */
+	void draw(SurfaceRenderer *surfaceRenderer) const;
+
+	/**
+	 * Fill the surface with a fixed color.
+	 *
+	 * @param color Color value in format returned by getFormat.
+	 */
+	void fill(uint32 color);
+
+	/**
+	 * Get the backing surface
+	 *
+	 * This can be used to update the image data, but causes a full update.
+	 * Using copyRectToSurface is preferred
+	 */
+	Graphics::Surface *getBackingSurface();
+
+	/**
+	 * Get the backing surface
+	 *
+	 * This const version can be used to read image data without causing
+	 * a full texture invalidation.
+	 */
+	const Graphics::Surface *getBackingSurface() const;
+
+private:
+	static const uint maxTextureSize = 256;
+
+	struct Tile {
+		Texture *texture;
+		Common::Rect rect;
+		bool dirty;
+	};
+
+	Graphics::Surface _backingSurface;
+	Common::Array<Tile> _tiles;
+
+	void invalidateAllTiles();
+};
+
+} // End of namespace OpenGL
+
+#endif