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

graphics/opengl/tiledsurface.cpp

@@ -0,0 +1,125 @@
+/* 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.
+ *
+ */
+
+#include "common/textconsole.h"
+
+#if defined(USE_OPENGL)
+
+#include "graphics/opengl/tiledsurface.h"
+
+#include "graphics/opengl/surfacerenderer.h"
+#include "graphics/opengl/texture.h"
+
+namespace OpenGL {
+
+TiledSurface::TiledSurface(uint width, uint height, const Graphics::PixelFormat &pixelFormat) {
+	_backingSurface.create(width, height, pixelFormat);
+
+	for (uint y = 0; y < height; y += maxTextureSize) {
+		for (uint x = 0; x < width; x += maxTextureSize) {
+			uint textureWidth = (x + maxTextureSize >= width) ? (width - x) : maxTextureSize;
+			uint textureHeight = (y + maxTextureSize >= height) ? (height - y) : maxTextureSize;
+
+			_tiles.push_back(Tile());
+
+			Tile &tile = _tiles.back();
+			tile.rect = Common::Rect(textureWidth, textureHeight);
+			tile.rect.translate(x, y);
+			tile.texture = nullptr;
+			tile.dirty = true;
+		}
+	}
+}
+
+TiledSurface::~TiledSurface() {
+	for (uint i = 0; i < _tiles.size(); i++) {
+		delete _tiles[i].texture;
+	}
+	_backingSurface.free();
+}
+
+void TiledSurface::copyRectToSurface(const void *src, int srcPitch, int x, int y, int w, int h) {
+	_backingSurface.copyRectToSurface(src, srcPitch, x, y, w, h);
+
+	Common::Rect destRect = Common::Rect(w, h);
+	destRect.translate(x, y);
+
+	for (uint i = 0; i < _tiles.size(); i++) {
+		if (_tiles[i].rect.intersects(destRect) || _tiles[i].rect.contains(destRect)) {
+			_tiles[i].dirty = true;
+		}
+	}
+}
+
+void TiledSurface::update() {
+	for (uint i = 0; i < _tiles.size(); i++) {
+		Tile &tile = _tiles[i];
+		if (tile.dirty) {
+			Graphics::Surface subSurface = _backingSurface.getSubArea(tile.rect);
+
+			delete tile.texture;
+			tile.texture = new Texture(subSurface);
+
+			tile.dirty = false;
+		}
+	}
+}
+
+void TiledSurface::draw(SurfaceRenderer *surfaceRenderer) const {
+	for (uint i = 0; i < _tiles.size(); i++) {
+		const Tile &tile = _tiles[i];
+
+		assert(tile.texture);
+		assert(!tile.dirty);
+
+		Math::Vector2d topLeft = Math::Vector2d(tile.rect.left / (float)_backingSurface.w, tile.rect.top / (float)_backingSurface.h);
+		Math::Vector2d bottomRight = Math::Vector2d(tile.rect.right / (float)_backingSurface.w, tile.rect.bottom / (float)_backingSurface.h);
+
+		surfaceRenderer->render(tile.texture, Math::Rect2d(topLeft, bottomRight));
+	}
+}
+
+void TiledSurface::fill(uint32 color) {
+	Common::Rect rect = Common::Rect(_backingSurface.w, _backingSurface.h);
+	_backingSurface.fillRect(rect, color);
+
+	invalidateAllTiles();
+}
+
+void TiledSurface::invalidateAllTiles() {
+	for (uint i = 0; i < _tiles.size(); i++) {
+		_tiles[i].dirty = true;
+	}
+}
+
+Graphics::Surface *TiledSurface::getBackingSurface() {
+	invalidateAllTiles();
+	return &_backingSurface;
+}
+
+const Graphics::Surface *TiledSurface::getBackingSurface() const {
+	return &_backingSurface;
+}
+
+} // End of namespace OpenGL
+
+#endif