Initial commit

graphics/renderer.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 "graphics/renderer.h"
+
+#include "common/translation.h"
+#include "common/system.h"
+
+#include "graphics/opengl/context.h"
+
+namespace Graphics {
+
+static const RendererTypeDescription rendererTypes[] = {
+#if defined(USE_OPENGL_GAME)
+	{ "opengl", _s("OpenGL"), kRendererTypeOpenGL },
+#endif
+#if defined(USE_OPENGL_SHADERS)
+	{ "opengl_shaders", _s("OpenGL with shaders"), kRendererTypeOpenGLShaders },
+#endif
+#ifdef USE_TINYGL
+	{ "software", "Software", kRendererTypeTinyGL },
+#endif
+	{ 0, 0, kRendererTypeDefault }
+};
+
+DECLARE_TRANSLATION_ADDITIONAL_CONTEXT("OpenGL with shaders", "lowres")
+
+Common::Array<RendererTypeDescription> Renderer::listTypes() {
+	uint32 available = getAvailableTypes();
+	Common::Array<RendererTypeDescription> ret;
+	for (const RendererTypeDescription *rt = rendererTypes; rt->code; ++rt) {
+		if (available & rt->id) {
+			ret.push_back(*rt);
+		}
+	}
+	return ret;
+}
+
+RendererType Renderer::parseTypeCode(const Common::String &code) {
+	const RendererTypeDescription *rt = rendererTypes;
+	while (rt->code) {
+		if (rt->code == code) {
+			return rt->id;
+		}
+		rt++;
+	}
+
+	return kRendererTypeDefault;
+}
+
+Common::String Renderer::getTypeCode(RendererType type) {
+	const RendererTypeDescription *rt = rendererTypes;
+	while (rt->code) {
+		if (rt->id == type) {
+			return rt->code;
+		}
+		rt++;
+	}
+
+	return "";
+}
+
+uint32 Renderer::getAvailableTypes() {
+	uint32 available = 0;
+
+#if defined(USE_TINYGL)
+	/* TinyGL doesn't depend on hardware support */
+	available |= kRendererTypeTinyGL;
+#endif
+
+#if defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)
+	bool backendCapableOpenGL = g_system->hasFeature(OSystem::kFeatureOpenGLForGame);
+
+	if (backendCapableOpenGL) {
+		/* Backend either support OpenGL or OpenGL ES(2) */
+#if defined(USE_OPENGL_GAME)
+		/* OpenGL classic is compiled in, check if hardware supports it */
+		if (g_system->getOpenGLType() == OpenGL::kContextGL) {
+			available |= kRendererTypeOpenGL;
+		}
+#endif
+#if defined(USE_OPENGL_SHADERS)
+		/* OpenGL with shaders is compiled in, check if hardware supports it */
+		if (g_system->hasFeature(OSystem::kFeatureShadersForGame)) {
+			available |= kRendererTypeOpenGLShaders;
+		}
+#endif
+	}
+#endif // defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS
+	return available;
+}
+
+RendererType Renderer::getBestMatchingType(RendererType desired, uint32 available) {
+	/* What we want is possible */
+	if (available & desired) {
+		return desired;
+	}
+
+	/* We apply the same logic when nothing is desired and when what we want is not possible */
+	if (desired != kRendererTypeDefault) {
+		warning("Unable to create a '%s' renderer", getTypeCode(desired).c_str());
+	}
+
+	/* Shaders are the best experience */
+	if (available & kRendererTypeOpenGLShaders) {
+		return kRendererTypeOpenGLShaders;
+	}
+	/* then OpenGL */
+	if (available & kRendererTypeOpenGL) {
+		return kRendererTypeOpenGL;
+	}
+	/* then TinyGL */
+	if (available & kRendererTypeTinyGL) {
+		return kRendererTypeTinyGL;
+	}
+
+	/* Failure is not an option */
+	error("Unable to create a renderer");
+}
+
+} // End of namespace Graphics