Initial commit

engines/stark/gfx/driver.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "engines/stark/gfx/driver.h"
+#include "engines/stark/gfx/opengl.h"
+#include "engines/stark/gfx/opengls.h"
+#include "engines/stark/gfx/tinygl.h"
+#include "engines/stark/services/services.h"
+#include "engines/stark/services/settings.h"
+
+#include "common/config-manager.h"
+
+#include "graphics/renderer.h"
+#include "graphics/surface.h"
+#if defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)
+#include "graphics/opengl/context.h"
+#endif
+
+#include "gui/error.h"
+
+#include "engines/util.h"
+
+namespace Stark {
+namespace Gfx {
+
+Driver *Driver::create() {
+	Common::String rendererConfig = ConfMan.get("renderer");
+	Graphics::RendererType desiredRendererType = Graphics::Renderer::parseTypeCode(rendererConfig);
+	Graphics::RendererType matchingRendererType = Graphics::Renderer::getBestMatchingAvailableType(desiredRendererType,
+#if defined(USE_OPENGL_GAME)
+			Graphics::kRendererTypeOpenGL |
+#endif
+#if defined(USE_OPENGL_SHADERS)
+			Graphics::kRendererTypeOpenGLShaders |
+#endif
+#if defined(USE_TINYGL)
+			Graphics::kRendererTypeTinyGL |
+#endif
+			0);
+
+	bool softRenderer = matchingRendererType == Graphics::kRendererTypeTinyGL;
+	if (!softRenderer) {
+		initGraphics3d(kOriginalWidth, kOriginalHeight);
+	} else {
+		initGraphics(kOriginalWidth, kOriginalHeight, nullptr);
+	}
+
+#if defined(USE_OPENGL_SHADERS)
+	if (matchingRendererType == Graphics::kRendererTypeOpenGLShaders) {
+		return new OpenGLSDriver();
+	}
+#endif
+#if defined(USE_OPENGL_GAME)
+	if (matchingRendererType == Graphics::kRendererTypeOpenGL) {
+		return new OpenGLDriver();
+	}
+#endif
+#if defined(USE_TINYGL)
+	if (matchingRendererType == Graphics::kRendererTypeTinyGL) {
+		return new TinyGLDriver();
+	}
+#endif
+	/* We should never end up here, getBestMatchingRendererType would have failed before */
+	error("Unable to create a renderer");
+}
+
+const Graphics::PixelFormat Driver::getRGBAPixelFormat() {
+	return Graphics::PixelFormat::createFormatRGBA32();
+}
+
+bool Driver::computeScreenViewport() {
+	int32 screenWidth = g_system->getWidth();
+	int32 screenHeight = g_system->getHeight();
+
+	Common::Rect viewport;
+	if (g_system->getFeatureState(OSystem::kFeatureAspectRatioCorrection)) {
+		// Aspect ratio correction
+		int32 viewportWidth = MIN<int32>(screenWidth, screenHeight * kOriginalWidth / kOriginalHeight);
+		int32 viewportHeight = MIN<int32>(screenHeight, screenWidth * kOriginalHeight / kOriginalWidth);
+		viewport = Common::Rect(viewportWidth, viewportHeight);
+
+		// Pillarboxing
+		viewport.translate((screenWidth - viewportWidth) / 2,
+			(screenHeight - viewportHeight) / 2);
+	} else {
+		// Aspect ratio correction disabled, just stretch
+		viewport = Common::Rect(screenWidth, screenHeight);
+	}
+
+	if (viewport == _screenViewport) {
+		return false;
+	}
+
+	_screenViewport = viewport;
+	return true;
+}
+
+Common::Rect Driver::gameViewport() const {
+	Common::Rect game = Common::Rect(_screenViewport.width(), _screenViewport.height() * kGameViewportHeight / kOriginalHeight);
+	game.translate(_screenViewport.left, _screenViewport.top + _screenViewport.height() * kTopBorderHeight / kOriginalHeight);
+
+	return game;
+}
+
+Common::Point Driver::convertCoordinateCurrentToOriginal(const Common::Point &point) const {
+	// Most of the engine expects 640x480 coordinates
+	Common::Point scaledPosition = point;
+	scaledPosition.x -= _screenViewport.left;
+	scaledPosition.y -= _screenViewport.top;
+	scaledPosition.x = CLIP<int16>(scaledPosition.x, 0, _screenViewport.width());
+	scaledPosition.y = CLIP<int16>(scaledPosition.y, 0, _screenViewport.height());
+	scaledPosition.x *= kOriginalWidth / (float)_screenViewport.width();
+	scaledPosition.y *= kOriginalHeight / (float)_screenViewport.height();
+
+	return scaledPosition;
+}
+
+uint Driver::scaleWidthOriginalToCurrent(uint width) const {
+	return _screenViewport.width() * width / kOriginalWidth;
+}
+
+uint Driver::scaleHeightOriginalToCurrent(uint height) const {
+	return _screenViewport.height() * height / kOriginalHeight;
+}
+
+uint Driver::scaleWidthCurrentToOriginal(uint width) const {
+	return kOriginalWidth * width / _screenViewport.width();
+}
+
+uint Driver::scaleHeightCurrentToOriginal(uint height) const {
+	return kOriginalHeight * height / _screenViewport.height();
+}
+
+void Driver::flipVertical(Graphics::Surface *s) {
+	for (int y = 0; y < s->h / 2; ++y) {
+		// Flip the lines
+		byte *line1P = (byte *)s->getBasePtr(0, y);
+		byte *line2P = (byte *)s->getBasePtr(0, s->h - y - 1);
+
+		for (int x = 0; x < s->pitch; ++x)
+			SWAP(line1P[x], line2P[x]);
+	}
+}
+
+bool Driver::isPosInScreenBounds(const Common::Point &point) const {
+	return _screenViewport.contains(point);
+}
+
+} // End of namespace Gfx
+} // End of namespace Stark