Initial commit

backends/graphics/opengl/pipelines/pipeline.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 "backends/graphics/opengl/pipelines/pipeline.h"
+#include "backends/graphics/opengl/framebuffer.h"
+
+namespace OpenGL {
+
+Pipeline *Pipeline::activePipeline = nullptr;
+
+Pipeline::Pipeline()
+	: _activeFramebuffer(nullptr) {
+}
+
+void Pipeline::activate() {
+	if (activePipeline == this) {
+		return;
+	}
+
+	if (activePipeline) {
+		activePipeline->deactivate();
+	}
+
+	activePipeline = this;
+
+	activateInternal();
+}
+
+void Pipeline::activateInternal() {
+	if (_activeFramebuffer) {
+		_activeFramebuffer->activate(this);
+	}
+}
+
+void Pipeline::deactivate() {
+	assert(isActive());
+
+	deactivateInternal();
+
+	activePipeline = nullptr;
+}
+
+void Pipeline::deactivateInternal() {
+	if (_activeFramebuffer) {
+		_activeFramebuffer->deactivate();
+	}
+}
+
+Framebuffer *Pipeline::setFramebuffer(Framebuffer *framebuffer) {
+	Framebuffer *oldFramebuffer = _activeFramebuffer;
+	if (isActive() && oldFramebuffer) {
+		oldFramebuffer->deactivate();
+	}
+
+	_activeFramebuffer = framebuffer;
+	if (isActive() && _activeFramebuffer) {
+		_activeFramebuffer->activate(this);
+	}
+
+	return oldFramebuffer;
+}
+
+} // End of namespace OpenGL