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125 lines
4.7 KiB
C++
125 lines
4.7 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_OPENGLHELPERS_H_INCLUDED
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#define JUCE_OPENGLHELPERS_H_INCLUDED
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//==============================================================================
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/**
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A set of miscellaneous openGL helper functions.
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*/
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class JUCE_API OpenGLHelpers
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{
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public:
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/** Clears the GL error state. */
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static void resetErrorState();
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/** Returns true if the current thread has an active OpenGL context. */
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static bool isContextActive();
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/** Clears the current context using the given colour. */
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static void clear (Colour colour);
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static void enableScissorTest (const Rectangle<int>& clip);
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/** Checks whether the current context supports the specified extension. */
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static bool isExtensionSupported (const char* extensionName);
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/** Returns the address of a named GL extension function */
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static void* getExtensionFunction (const char* functionName);
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#if JUCE_USE_OPENGL_FIXED_FUNCTION
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/** Sets the current colour using a JUCE colour. */
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static void setColour (Colour colour);
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/** Gives the current context an orthoganal rendering mode for 2D drawing into the given size. */
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static void prepareFor2D (int width, int height);
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/** This does the same job as gluPerspective(). */
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static void setPerspective (double fovy, double aspect, double zNear, double zFar);
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static void applyTransform (const AffineTransform& t);
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static void applyMatrix (const float matrixValues[16]);
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#if ! JUCE_OPENGL_ES
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static void applyMatrix (const double matrixValues[16]);
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#endif
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/** Draws a 2D quad with the specified corner points. */
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static void drawQuad2D (float x1, float y1,
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float x2, float y2,
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float x3, float y3,
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float x4, float y4,
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Colour colour);
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/** Draws a 3D quad with the specified corner points. */
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static void drawQuad3D (float x1, float y1, float z1,
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float x2, float y2, float z2,
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float x3, float y3, float z3,
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float x4, float y4, float z4,
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Colour colour);
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static void drawTriangleStrip (const GLfloat* const vertices, const GLfloat* const textureCoords, const int numVertices) noexcept;
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static void drawTriangleStrip (const GLfloat* const vertices, const GLfloat* const textureCoords,
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const int numVertices, const GLuint textureID) noexcept;
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static void drawTextureQuad (GLuint textureID, const Rectangle<int>& rect);
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static void fillRectWithTexture (const Rectangle<int>& rect, GLuint textureID, const float alpha);
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/** Fills a rectangle with the specified colour. */
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static void fillRectWithColour (const Rectangle<int>& rect,
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Colour colour);
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static void fillRect (const Rectangle<int>& rect);
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#endif
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};
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//==============================================================================
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/**
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Used as a local object while rendering, this will create a temporary texture ID
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from an image in the quickest way possible.
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If the image is backed by an OpenGL framebuffer, it will use that directly; otherwise,
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this object will create a temporary texture or framebuffer and copy the image.
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*/
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class JUCE_API OpenGLTextureFromImage
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{
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public:
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OpenGLTextureFromImage (const Image& image);
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~OpenGLTextureFromImage();
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GLuint textureID;
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const int imageWidth, imageHeight;
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float fullWidthProportion, fullHeightProportion;
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private:
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ScopedPointer<OpenGLTexture> texture;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (OpenGLTextureFromImage)
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};
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#endif // JUCE_OPENGLHELPERS_H_INCLUDED
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