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engines/alcachofa/graphics-opengl-base.h

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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/>.
+ *
+ */
+
+#ifndef ALCACHOFA_GRAPHICS_OPENGL_BASE_H
+#define ALCACHOFA_GRAPHICS_OPENGL_BASE_H
+
+// This file shall not use any OpenGL API surface or include headers related to it
+
+#include "alcachofa/graphics.h"
+
+namespace Alcachofa {
+
+class OpenGLRendererBase : public virtual IRenderer {
+public:
+	OpenGLRendererBase(Common::Point resolution);
+
+	bool hasOutput() const override;
+
+protected:
+	virtual void setViewportInner(int x, int y, int width, int height) = 0;
+	virtual void setMatrices(bool flipped) = 0;
+
+	void resetState();
+	void setViewportToScreen();
+	void setViewportToRect(int16 outputWidth, int16 outputHeight);
+	void getQuadPositions(Math::Vector2d topLeft, Math::Vector2d size, Math::Angle rotation, Math::Vector2d positions[]) const;
+	void getQuadTexCoords(Math::Vector2d texMin, Math::Vector2d texMax, Math::Vector2d texCoords[]) const;
+
+	Common::Point _resolution, _outputSize;
+	Graphics::Surface *_currentOutput = nullptr;
+	BlendMode _currentBlendMode = (BlendMode)-1;
+	float _currentLodBias = 0.0f;
+	bool _isFirstDrawCommand = false;
+};
+
+}
+
+#endif // ALCACHOFA_GRAPHICS_OPENGL_BASE_H