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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 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.
+ *
+ */
+
+#ifndef BACKENDS_GRAPHICS_OPENGL_TEXTURE_H
+#define BACKENDS_GRAPHICS_OPENGL_TEXTURE_H
+
+#include "backends/graphics/opengl/opengl-sys.h"
+
+#include "graphics/pixelformat.h"
+#include "graphics/surface.h"
+
+#include "common/rect.h"
+
+namespace OpenGL {
+
+/**
+ * An OpenGL texture wrapper. It automatically takes care of all OpenGL
+ * texture handling issues and also provides access to the texture data.
+ */
+class Texture {
+public:
+ /**
+ * Create a new texture with the specific internal format.
+ *
+ * @param glIntFormat The internal format to use.
+ * @param glFormat The input format.
+ * @param glType The input type.
+ * @param format The format used for the texture input.
+ */
+ Texture(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format);
+ virtual ~Texture();
+
+ /**
+ * Destroy the OpenGL texture name.
+ */
+ void releaseInternalTexture();
+
+ /**
+ * Create the OpenGL texture name and flag the whole texture as dirty.
+ */
+ void recreateInternalTexture();
+
+ /**
+ * Enable or disable linear texture filtering.
+ *
+ * @param enable true to enable and false to disable.
+ */
+ void enableLinearFiltering(bool enable);
+
+ /**
+ * Allocate texture space for the desired dimensions. This wraps any
+ * handling of requirements for POT textures.
+ *
+ * @param width The desired logical width.
+ * @param height The desired logical height.
+ */
+ virtual void allocate(uint width, uint height);
+
+ void copyRectToTexture(uint x, uint y, uint w, uint h, const void *src, uint srcPitch);
+
+ void fill(uint32 color);
+
+ void draw(GLuint x, GLuint y, GLuint w, GLuint h);
+
+ void flagDirty() { _allDirty = true; }
+ bool isDirty() const { return _allDirty || !_dirtyArea.isEmpty(); }
+
+ uint getWidth() const { return _userPixelData.w; }
+ uint getHeight() const { return _userPixelData.h; }
+
+ /**
+ * @return The hardware format of the texture data.
+ */
+ const Graphics::PixelFormat &getHardwareFormat() const { return _format; }
+
+ /**
+ * @return The logical format of the texture data.
+ */
+ virtual Graphics::PixelFormat getFormat() const { return _format; }
+
+ virtual Graphics::Surface *getSurface() { return &_userPixelData; }
+ virtual const Graphics::Surface *getSurface() const { return &_userPixelData; }
+
+ /**
+ * @return Whether the texture data is using a palette.
+ */
+ virtual bool hasPalette() const { return false; }
+
+ virtual void setPalette(uint start, uint colors, const byte *palData) {}
+
+ virtual void *getPalette() { return 0; }
+ virtual const void *getPalette() const { return 0; }
+
+ /**
+ * Query texture related OpenGL information from the context. This only
+ * queries the maximum texture size for now.
+ */
+ static void queryTextureInformation();
+
+ /**
+ * @return Return the maximum texture dimensions supported.
+ */
+ static GLint getMaximumTextureSize() { return _maxTextureSize; }
+protected:
+ virtual void updateTexture();
+
+ Common::Rect getDirtyArea() const;
+private:
+ const GLenum _glIntFormat;
+ const GLenum _glFormat;
+ const GLenum _glType;
+ const Graphics::PixelFormat _format;
+
+ GLint _glFilter;
+ GLuint _glTexture;
+
+ Graphics::Surface _textureData;
+ Graphics::Surface _userPixelData;
+
+ bool _allDirty;
+ Common::Rect _dirtyArea;
+ void clearDirty() { _allDirty = false; _dirtyArea = Common::Rect(); }
+
+ static GLint _maxTextureSize;
+};
+
+class TextureCLUT8 : public Texture {
+public:
+ TextureCLUT8(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format);
+ virtual ~TextureCLUT8();
+
+ virtual void allocate(uint width, uint height);
+
+ virtual Graphics::PixelFormat getFormat() const;
+
+ virtual bool hasPalette() const { return true; }
+
+ virtual void setPalette(uint start, uint colors, const byte *palData);
+
+ virtual void *getPalette() { return _palette; }
+ virtual const void *getPalette() const { return _palette; }
+
+ virtual Graphics::Surface *getSurface() { return &_clut8Data; }
+ virtual const Graphics::Surface *getSurface() const { return &_clut8Data; }
+
+protected:
+ virtual void updateTexture();
+
+private:
+ Graphics::Surface _clut8Data;
+ byte *_palette;
+};
+
+} // End of namespace OpenGL
+
+#endif