- initial version

git-svn-id: http://moon:8086/svn/software/trunk/projects/RBM@14 b431acfa-c32f-4a4a-93f1-934dc6c82436
2014-09-24 17:21:29 +00:00
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+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2013 - Raw Material Software Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found at: www.gnu.org/licenses
+
+   JUCE 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.
+
+   ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.juce.com for more information.
+
+  ==============================================================================
+*/
+
+#ifndef JUCE_OPENGLTEXTURE_H_INCLUDED
+#define JUCE_OPENGLTEXTURE_H_INCLUDED
+
+//==============================================================================
+/**
+    Creates an openGL texture from an Image.
+*/
+class JUCE_API  OpenGLTexture
+{
+public:
+    OpenGLTexture();
+    ~OpenGLTexture();
+
+    /** Creates a texture from the given image.
+
+        Note that if the image's dimensions aren't a power-of-two, the texture may
+        be created with a larger size.
+
+        The image will be arranged so that its top-left corner is at texture
+        coordinate (0, 1).
+    */
+    void loadImage (const Image& image);
+
+    /** Creates a texture from a raw array of pixels.
+        If width and height are not powers-of-two, the texture will be created with a
+        larger size, and only the subsection (0, 0, width, height) will be initialised.
+        The data is sent directly to the OpenGL driver without being flipped vertically,
+        so the first pixel will be mapped onto texture coordinate (0, 0).
+    */
+    void loadARGB (const PixelARGB* pixels, int width, int height);
+
+    /** Creates a texture from a raw array of pixels.
+        This is like loadARGB, but will vertically flip the data so that the first
+        pixel ends up at texture coordinate (0, 1), and if the width and height are
+        not powers-of-two, it will compensate by using a larger texture size.
+    */
+    void loadARGBFlipped (const PixelARGB* pixels, int width, int height);
+
+    /** Creates an alpha-channel texture from an array of alpha values.
+        If width and height are not powers-of-two, the texture will be created with a
+        larger size, and only the subsection (0, 0, width, height) will be initialised.
+        The data is sent directly to the OpenGL driver without being flipped vertically,
+        so the first pixel will be mapped onto texture coordinate (0, 0).
+    */
+    void loadAlpha (const uint8* pixels, int width, int height);
+
+    /** Frees the texture, if there is one. */
+    void release();
+
+    /** Binds the texture to the currently active openGL context. */
+    void bind() const;
+
+    /** Unbinds the texture to the currently active openGL context. */
+    void unbind() const;
+
+    /** Returns the GL texture ID number. */
+    GLuint getTextureID() const noexcept        { return textureID; }
+
+    int getWidth() const noexcept               { return width; }
+    int getHeight() const noexcept              { return height; }
+
+    /** Returns true if a texture can be created with the given size.
+        Some systems may require that the sizes are powers-of-two.
+    */
+    static bool isValidSize (int width, int height);
+
+private:
+    GLuint textureID;
+    int width, height;
+    OpenGLContext* ownerContext;
+
+    void create (int w, int h, const void*, GLenum, bool topLeft);
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (OpenGLTexture)
+};
+
+
+#endif   // JUCE_OPENGLTEXTURE_H_INCLUDED