mirror of
https://github.com/juce-framework/JUCE.git
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127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE 6 technical preview.
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Copyright (c) 2017 - ROLI Ltd.
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You may use this code under the terms of the GPL v3
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(see www.gnu.org/licenses).
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For this technical preview, this file is not subject to commercial licensing.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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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 (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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{
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String output;
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#if JUCE_ANDROID
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{
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int numAttributes = 0;
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for (int p = code.indexOf (0, "attribute "); p >= 0; p = code.indexOf (p + 1, "attribute "))
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numAttributes++;
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int last = 0;
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for (int p = code.indexOf (0, "attribute "); p >= 0; p = code.indexOf (p + 1, "attribute "))
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{
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output += code.substring (last, p) + "layout(location=" + String (--numAttributes) + ") in ";
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last = p + 10;
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}
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output += code.substring (last);
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}
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#else
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output = code.replace ("attribute", "in");
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#endif
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return JUCE_GLSL_VERSION "\n" + output.replace ("varying", "out");
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}
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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 " JUCE_MEDIUMP " 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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} // namespace juce
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