JUCE/modules/juce_opengl/juce_opengl.cpp

/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2017 - ROLI Ltd.

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#ifdef JUCE_OPENGL_H_INCLUDED
 /* When you add this cpp file to your project, you mustn't include it in a file where you've
    already included any other headers - just put it inside a file on its own, possibly with your config
    flags preceding it, but don't include anything else. That also includes avoiding any automatic prefix
    header files that the compiler may be using.
 */
 #error "Incorrect use of JUCE cpp file"
#endif

#define JUCE_CORE_INCLUDE_OBJC_HELPERS 1
#define JUCE_CORE_INCLUDE_JNI_HELPERS 1
#define JUCE_CORE_INCLUDE_NATIVE_HEADERS 1
#define JUCE_GRAPHICS_INCLUDE_COREGRAPHICS_HELPERS 1
#define JUCE_GUI_BASICS_INCLUDE_XHEADERS 1

#include "juce_opengl.h"

//==============================================================================
#if JUCE_IOS
 #import <QuartzCore/QuartzCore.h>

//==============================================================================
#elif JUCE_WINDOWS
 #include <windowsx.h>

 #if ! JUCE_MINGW && ! JUCE_DONT_AUTOLINK_TO_WIN32_LIBRARIES
  #pragma comment(lib, "OpenGL32.Lib")
 #endif

//==============================================================================
#elif JUCE_LINUX
 /* Got an include error here?

    If you want to install OpenGL support, the packages to get are "mesa-common-dev"
    and "freeglut3-dev".
 */
 #include <GL/glx.h>

//==============================================================================
#elif JUCE_MAC
 #include <OpenGL/CGLCurrent.h> // These are both just needed with the 10.5 SDK
 #include <OpenGL/OpenGL.h>

//==============================================================================
#elif JUCE_ANDROID
 #ifndef GL_GLEXT_PROTOTYPES
  #define GL_GLEXT_PROTOTYPES 1
 #endif

 #if JUCE_ANDROID_GL_ES_VERSION_3_0
  #include <GLES3/gl3.h>

  // workaround for a bug in SDK 18 and 19
  // see: https://stackoverflow.com/questions/31003863/gles-3-0-including-gl2ext-h
  #define __gl2_h_
  #include <GLES2/gl2ext.h>
 #else
  #include <GLES2/gl2.h>
 #endif
#endif

//==============================================================================
namespace juce
{

void OpenGLExtensionFunctions::initialise()
{
   #if JUCE_WINDOWS || JUCE_LINUX
    #define JUCE_INIT_GL_FUNCTION(name, returnType, params, callparams) \
        name = (type_ ## name) OpenGLHelpers::getExtensionFunction (#name);

    JUCE_GL_BASE_FUNCTIONS (JUCE_INIT_GL_FUNCTION)
    #undef JUCE_INIT_GL_FUNCTION

    #define JUCE_INIT_GL_FUNCTION(name, returnType, params, callparams) \
        name = (type_ ## name) OpenGLHelpers::getExtensionFunction (#name); \
        if (name == nullptr) \
            name = (type_ ## name) OpenGLHelpers::getExtensionFunction (JUCE_STRINGIFY (name ## EXT));

    JUCE_GL_EXTENSION_FUNCTIONS (JUCE_INIT_GL_FUNCTION)
    #if JUCE_OPENGL3
     JUCE_GL_VERTEXBUFFER_FUNCTIONS (JUCE_INIT_GL_FUNCTION)
    #endif

    #undef JUCE_INIT_GL_FUNCTION
   #endif
}

#if JUCE_OPENGL_ES
 #define JUCE_DECLARE_GL_FUNCTION(name, returnType, params, callparams) \
    returnType OpenGLExtensionFunctions::name params noexcept { return ::name callparams; }

 JUCE_GL_BASE_FUNCTIONS (JUCE_DECLARE_GL_FUNCTION)
 JUCE_GL_EXTENSION_FUNCTIONS (JUCE_DECLARE_GL_FUNCTION)
#if JUCE_OPENGL3
 JUCE_GL_VERTEXBUFFER_FUNCTIONS (JUCE_DECLARE_GL_FUNCTION)
#endif

 #undef JUCE_DECLARE_GL_FUNCTION
#endif

#undef JUCE_GL_EXTENSION_FUNCTIONS

#if JUCE_DEBUG && ! defined (JUCE_CHECK_OPENGL_ERROR)
static const char* getGLErrorMessage (const GLenum e) noexcept
{
    switch (e)
    {
        case GL_INVALID_ENUM:                   return "GL_INVALID_ENUM";
        case GL_INVALID_VALUE:                  return "GL_INVALID_VALUE";
        case GL_INVALID_OPERATION:              return "GL_INVALID_OPERATION";
        case GL_OUT_OF_MEMORY:                  return "GL_OUT_OF_MEMORY";
       #ifdef GL_STACK_OVERFLOW
        case GL_STACK_OVERFLOW:                 return "GL_STACK_OVERFLOW";
       #endif
       #ifdef GL_STACK_UNDERFLOW
        case GL_STACK_UNDERFLOW:                return "GL_STACK_UNDERFLOW";
       #endif
       #ifdef GL_INVALID_FRAMEBUFFER_OPERATION
        case GL_INVALID_FRAMEBUFFER_OPERATION:  return "GL_INVALID_FRAMEBUFFER_OPERATION";
       #endif
        default: break;
    }

    return "Unknown error";
}

#if JUCE_MAC || JUCE_IOS

 #ifndef JUCE_IOS_MAC_VIEW
  #if JUCE_IOS
   #define JUCE_IOS_MAC_VIEW    UIView
   #define JUCE_IOS_MAC_WINDOW  UIWindow
  #else
   #define JUCE_IOS_MAC_VIEW    NSView
   #define JUCE_IOS_MAC_WINDOW  NSWindow
  #endif
 #endif

#endif

static bool checkPeerIsValid (OpenGLContext* context)
{
    jassert (context != nullptr);

    if (context != nullptr)
    {
        if (auto* comp = context->getTargetComponent())
        {
            if (auto* peer = comp->getPeer())
            {
               #if JUCE_MAC || JUCE_IOS
                if (auto* nsView = (JUCE_IOS_MAC_VIEW*) peer->getNativeHandle())
                {
                    if (auto nsWindow = [nsView window])
                    {
                       #if JUCE_MAC
                        return ([nsWindow isVisible]
                                  && (! [nsWindow hidesOnDeactivate] || [NSApp isActive]));
                       #else
                        ignoreUnused (nsWindow);
                        return true;
                       #endif
                    }
                }
               #else
                ignoreUnused (peer);
                return true;
               #endif
            }
        }
    }

    return false;
}

static void checkGLError (const char* file, const int line)
{
    for (;;)
    {
        const GLenum e = glGetError();

        if (e == GL_NO_ERROR)
            break;

        // if the peer is not valid then ignore errors
        if (! checkPeerIsValid (OpenGLContext::getCurrentContext()))
            continue;

        DBG ("***** " << getGLErrorMessage (e) << "  at " << file << " : " << line);
        jassertfalse;
    }
}

 #define JUCE_CHECK_OPENGL_ERROR checkGLError (__FILE__, __LINE__);
#else
 #define JUCE_CHECK_OPENGL_ERROR ;
#endif

static void clearGLError() noexcept
{
    while (glGetError() != GL_NO_ERROR) {}
}

struct OpenGLTargetSaver
{
    OpenGLTargetSaver (const OpenGLContext& c) noexcept
        : context (c), oldFramebuffer (OpenGLFrameBuffer::getCurrentFrameBufferTarget())
    {
        glGetIntegerv (GL_VIEWPORT, oldViewport);
    }

    ~OpenGLTargetSaver() noexcept
    {
        context.extensions.glBindFramebuffer (GL_FRAMEBUFFER, oldFramebuffer);
        glViewport (oldViewport[0], oldViewport[1], oldViewport[2], oldViewport[3]);
    }

private:
    const OpenGLContext& context;
    GLuint oldFramebuffer;
    GLint oldViewport[4];

    OpenGLTargetSaver& operator= (const OpenGLTargetSaver&);
};

} // namespace juce

//==============================================================================
#include "opengl/juce_OpenGLFrameBuffer.cpp"
#include "opengl/juce_OpenGLGraphicsContext.cpp"
#include "opengl/juce_OpenGLHelpers.cpp"
#include "opengl/juce_OpenGLImage.cpp"
#include "opengl/juce_OpenGLPixelFormat.cpp"
#include "opengl/juce_OpenGLShaderProgram.cpp"
#include "opengl/juce_OpenGLTexture.cpp"

//==============================================================================
#if JUCE_MAC || JUCE_IOS

 JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")

 #if JUCE_MAC
  #include "native/juce_OpenGL_osx.h"
 #else
  #include "native/juce_OpenGL_ios.h"
 #endif

 JUCE_END_IGNORE_WARNINGS_GCC_LIKE

#elif JUCE_WINDOWS
 #include "native/juce_OpenGL_win32.h"

#elif JUCE_LINUX
 #include "native/juce_OpenGL_linux_X11.h"

#elif JUCE_ANDROID
 #include "native/juce_OpenGL_android.h"

#endif

#include "opengl/juce_OpenGLContext.cpp"
#include "utils/juce_OpenGLAppComponent.cpp"