mirror of
https://github.com/juce-framework/JUCE.git
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103 lines
3.3 KiB
C++
103 lines
3.3 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI 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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void OpenGLHelpers::resetErrorState()
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{
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while (glGetError() != GL_NO_ERROR) {}
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}
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void* OpenGLHelpers::getExtensionFunction (const char* functionName)
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{
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#if JUCE_WINDOWS
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return (void*) wglGetProcAddress (functionName);
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#elif JUCE_LINUX
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return (void*) glXGetProcAddress ((const GLubyte*) functionName);
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#else
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static void* handle = dlopen (nullptr, RTLD_LAZY);
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return dlsym (handle, functionName);
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#endif
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}
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bool OpenGLHelpers::isExtensionSupported (const char* const extensionName)
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{
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jassert (extensionName != nullptr); // you must supply a genuine string for this.
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jassert (isContextActive()); // An OpenGL context will need to be active before calling this.
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const char* extensions = (const char*) glGetString (GL_EXTENSIONS);
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jassert (extensions != nullptr); // Perhaps you didn't activate an OpenGL context before calling this?
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for (;;)
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{
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const char* found = strstr (extensions, extensionName);
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if (found == nullptr)
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break;
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extensions = found + strlen (extensionName);
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if (extensions[0] == ' ' || extensions[0] == 0)
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return true;
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}
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return false;
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}
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void OpenGLHelpers::clear (Colour colour)
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{
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glClearColor (colour.getFloatRed(), colour.getFloatGreen(),
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colour.getFloatBlue(), colour.getFloatAlpha());
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glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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}
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void OpenGLHelpers::enableScissorTest (const Rectangle<int>& clip)
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{
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glEnable (GL_SCISSOR_TEST);
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glScissor (clip.getX(), clip.getY(), clip.getWidth(), clip.getHeight());
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}
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String OpenGLHelpers::translateVertexShaderToV3 (const String& code)
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{
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#if JUCE_OPENGL3
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if (OpenGLShaderProgram::getLanguageVersion() > 1.2)
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return JUCE_GLSL_VERSION "\n" + code.replace ("attribute", "in")
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.replace ("varying", "out");
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#endif
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return code;
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}
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String OpenGLHelpers::translateFragmentShaderToV3 (const String& code)
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{
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#if JUCE_OPENGL3
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if (OpenGLShaderProgram::getLanguageVersion() > 1.2)
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return JUCE_GLSL_VERSION "\n"
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"out vec4 fragColor;\n"
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+ code.replace ("varying", "in")
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.replace ("texture2D", "texture")
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.replace ("gl_FragColor", "fragColor");
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#endif
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return code;
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}
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