zorldo

Goofing around with Ebiten
git clone git://bsandro.tech/zorldo
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nsgl_context.m (11858B)

      1 //========================================================================
      2 // GLFW 3.3 macOS - www.glfw.org
      3 //------------------------------------------------------------------------
      4 // Copyright (c) 2009-2019 Camilla Löwy <elmindreda@glfw.org>
      5 //
      6 // This software is provided 'as-is', without any express or implied
      7 // warranty. In no event will the authors be held liable for any damages
      8 // arising from the use of this software.
      9 //
     10 // Permission is granted to anyone to use this software for any purpose,
     11 // including commercial applications, and to alter it and redistribute it
     12 // freely, subject to the following restrictions:
     13 //
     14 // 1. The origin of this software must not be misrepresented; you must not
     15 //    claim that you wrote the original software. If you use this software
     16 //    in a product, an acknowledgment in the product documentation would
     17 //    be appreciated but is not required.
     18 //
     19 // 2. Altered source versions must be plainly marked as such, and must not
     20 //    be misrepresented as being the original software.
     21 //
     22 // 3. This notice may not be removed or altered from any source
     23 //    distribution.
     24 //
     25 //========================================================================
     26 // It is fine to use C99 in this file because it will not be built with VS
     27 //========================================================================
     28 
     29 #include "internal.h"
     30 
     31 #include <unistd.h>
     32 #include <math.h>
     33 
     34 static void makeContextCurrentNSGL(_GLFWwindow* window)
     35 {
     36     @autoreleasepool {
     37 
     38     if (window)
     39         [window->context.nsgl.object makeCurrentContext];
     40     else
     41         [NSOpenGLContext clearCurrentContext];
     42 
     43     _glfwPlatformSetTls(&_glfw.contextSlot, window);
     44 
     45     } // autoreleasepool
     46 }
     47 
     48 static void swapBuffersNSGL(_GLFWwindow* window)
     49 {
     50     @autoreleasepool {
     51 
     52     // HACK: Simulate vsync with usleep as NSGL swap interval does not apply to
     53     //       windows with a non-visible occlusion state
     54     if (window->ns.occluded)
     55     {
     56         int interval = 0;
     57         [window->context.nsgl.object getValues:&interval
     58                                   forParameter:NSOpenGLContextParameterSwapInterval];
     59 
     60         if (interval > 0)
     61         {
     62             const double framerate = 60.0;
     63             const uint64_t frequency = _glfwPlatformGetTimerFrequency();
     64             const uint64_t value = _glfwPlatformGetTimerValue();
     65 
     66             const double elapsed = value / (double) frequency;
     67             const double period = 1.0 / framerate;
     68             const double delay = period - fmod(elapsed, period);
     69 
     70             usleep(floorl(delay * 1e6));
     71         }
     72     }
     73 
     74     [window->context.nsgl.object flushBuffer];
     75 
     76     } // autoreleasepool
     77 }
     78 
     79 static void swapIntervalNSGL(int interval)
     80 {
     81     @autoreleasepool {
     82 
     83     _GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
     84     if (window)
     85     {
     86         [window->context.nsgl.object setValues:&interval
     87                                   forParameter:NSOpenGLContextParameterSwapInterval];
     88     }
     89 
     90     } // autoreleasepool
     91 }
     92 
     93 static int extensionSupportedNSGL(const char* extension)
     94 {
     95     // There are no NSGL extensions
     96     return GLFW_FALSE;
     97 }
     98 
     99 static GLFWglproc getProcAddressNSGL(const char* procname)
    100 {
    101     CFStringRef symbolName = CFStringCreateWithCString(kCFAllocatorDefault,
    102                                                        procname,
    103                                                        kCFStringEncodingASCII);
    104 
    105     GLFWglproc symbol = CFBundleGetFunctionPointerForName(_glfw.nsgl.framework,
    106                                                           symbolName);
    107 
    108     CFRelease(symbolName);
    109 
    110     return symbol;
    111 }
    112 
    113 static void destroyContextNSGL(_GLFWwindow* window)
    114 {
    115     @autoreleasepool {
    116 
    117     [window->context.nsgl.pixelFormat release];
    118     window->context.nsgl.pixelFormat = nil;
    119 
    120     [window->context.nsgl.object release];
    121     window->context.nsgl.object = nil;
    122 
    123     } // autoreleasepool
    124 }
    125 
    126 
    127 //////////////////////////////////////////////////////////////////////////
    128 //////                       GLFW internal API                      //////
    129 //////////////////////////////////////////////////////////////////////////
    130 
    131 // Initialize OpenGL support
    132 //
    133 GLFWbool _glfwInitNSGL(void)
    134 {
    135     if (_glfw.nsgl.framework)
    136         return GLFW_TRUE;
    137 
    138     _glfw.nsgl.framework =
    139         CFBundleGetBundleWithIdentifier(CFSTR("com.apple.opengl"));
    140     if (_glfw.nsgl.framework == NULL)
    141     {
    142         _glfwInputError(GLFW_API_UNAVAILABLE,
    143                         "NSGL: Failed to locate OpenGL framework");
    144         return GLFW_FALSE;
    145     }
    146 
    147     return GLFW_TRUE;
    148 }
    149 
    150 // Terminate OpenGL support
    151 //
    152 void _glfwTerminateNSGL(void)
    153 {
    154 }
    155 
    156 // Create the OpenGL context
    157 //
    158 GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
    159                                 const _GLFWctxconfig* ctxconfig,
    160                                 const _GLFWfbconfig* fbconfig)
    161 {
    162     if (ctxconfig->client == GLFW_OPENGL_ES_API)
    163     {
    164         _glfwInputError(GLFW_API_UNAVAILABLE,
    165                         "NSGL: OpenGL ES is not available on macOS");
    166         return GLFW_FALSE;
    167     }
    168 
    169     if (ctxconfig->major > 2)
    170     {
    171         if (ctxconfig->major == 3 && ctxconfig->minor < 2)
    172         {
    173             _glfwInputError(GLFW_VERSION_UNAVAILABLE,
    174                             "NSGL: The targeted version of macOS does not support OpenGL 3.0 or 3.1 but may support 3.2 and above");
    175             return GLFW_FALSE;
    176         }
    177 
    178         if (!ctxconfig->forward || ctxconfig->profile != GLFW_OPENGL_CORE_PROFILE)
    179         {
    180             _glfwInputError(GLFW_VERSION_UNAVAILABLE,
    181                             "NSGL: The targeted version of macOS only supports forward-compatible core profile contexts for OpenGL 3.2 and above");
    182             return GLFW_FALSE;
    183         }
    184     }
    185 
    186     // Context robustness modes (GL_KHR_robustness) are not yet supported by
    187     // macOS but are not a hard constraint, so ignore and continue
    188 
    189     // Context release behaviors (GL_KHR_context_flush_control) are not yet
    190     // supported by macOS but are not a hard constraint, so ignore and continue
    191 
    192     // Debug contexts (GL_KHR_debug) are not yet supported by macOS but are not
    193     // a hard constraint, so ignore and continue
    194 
    195     // No-error contexts (GL_KHR_no_error) are not yet supported by macOS but
    196     // are not a hard constraint, so ignore and continue
    197 
    198 #define addAttrib(a) \
    199 { \
    200     assert((size_t) index < sizeof(attribs) / sizeof(attribs[0])); \
    201     attribs[index++] = a; \
    202 }
    203 #define setAttrib(a, v) { addAttrib(a); addAttrib(v); }
    204 
    205     NSOpenGLPixelFormatAttribute attribs[40];
    206     int index = 0;
    207 
    208     addAttrib(NSOpenGLPFAAccelerated);
    209     addAttrib(NSOpenGLPFAClosestPolicy);
    210 
    211     if (ctxconfig->nsgl.offline)
    212     {
    213         addAttrib(NSOpenGLPFAAllowOfflineRenderers);
    214         // NOTE: This replaces the NSSupportsAutomaticGraphicsSwitching key in
    215         //       Info.plist for unbundled applications
    216         // HACK: This assumes that NSOpenGLPixelFormat will remain
    217         //       a straightforward wrapper of its CGL counterpart
    218         addAttrib(kCGLPFASupportsAutomaticGraphicsSwitching);
    219     }
    220 
    221 #if MAC_OS_X_VERSION_MAX_ALLOWED >= 101000
    222     if (ctxconfig->major >= 4)
    223     {
    224         setAttrib(NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion4_1Core);
    225     }
    226     else
    227 #endif /*MAC_OS_X_VERSION_MAX_ALLOWED*/
    228     if (ctxconfig->major >= 3)
    229     {
    230         setAttrib(NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core);
    231     }
    232 
    233     if (ctxconfig->major <= 2)
    234     {
    235         if (fbconfig->auxBuffers != GLFW_DONT_CARE)
    236             setAttrib(NSOpenGLPFAAuxBuffers, fbconfig->auxBuffers);
    237 
    238         if (fbconfig->accumRedBits != GLFW_DONT_CARE &&
    239             fbconfig->accumGreenBits != GLFW_DONT_CARE &&
    240             fbconfig->accumBlueBits != GLFW_DONT_CARE &&
    241             fbconfig->accumAlphaBits != GLFW_DONT_CARE)
    242         {
    243             const int accumBits = fbconfig->accumRedBits +
    244                                   fbconfig->accumGreenBits +
    245                                   fbconfig->accumBlueBits +
    246                                   fbconfig->accumAlphaBits;
    247 
    248             setAttrib(NSOpenGLPFAAccumSize, accumBits);
    249         }
    250     }
    251 
    252     if (fbconfig->redBits != GLFW_DONT_CARE &&
    253         fbconfig->greenBits != GLFW_DONT_CARE &&
    254         fbconfig->blueBits != GLFW_DONT_CARE)
    255     {
    256         int colorBits = fbconfig->redBits +
    257                         fbconfig->greenBits +
    258                         fbconfig->blueBits;
    259 
    260         // macOS needs non-zero color size, so set reasonable values
    261         if (colorBits == 0)
    262             colorBits = 24;
    263         else if (colorBits < 15)
    264             colorBits = 15;
    265 
    266         setAttrib(NSOpenGLPFAColorSize, colorBits);
    267     }
    268 
    269     if (fbconfig->alphaBits != GLFW_DONT_CARE)
    270         setAttrib(NSOpenGLPFAAlphaSize, fbconfig->alphaBits);
    271 
    272     if (fbconfig->depthBits != GLFW_DONT_CARE)
    273         setAttrib(NSOpenGLPFADepthSize, fbconfig->depthBits);
    274 
    275     if (fbconfig->stencilBits != GLFW_DONT_CARE)
    276         setAttrib(NSOpenGLPFAStencilSize, fbconfig->stencilBits);
    277 
    278     if (fbconfig->stereo)
    279     {
    280 #if MAC_OS_X_VERSION_MAX_ALLOWED >= 101200
    281         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
    282                         "NSGL: Stereo rendering is deprecated");
    283         return GLFW_FALSE;
    284 #else
    285         addAttrib(NSOpenGLPFAStereo);
    286 #endif
    287     }
    288 
    289     if (fbconfig->doublebuffer)
    290         addAttrib(NSOpenGLPFADoubleBuffer);
    291 
    292     if (fbconfig->samples != GLFW_DONT_CARE)
    293     {
    294         if (fbconfig->samples == 0)
    295         {
    296             setAttrib(NSOpenGLPFASampleBuffers, 0);
    297         }
    298         else
    299         {
    300             setAttrib(NSOpenGLPFASampleBuffers, 1);
    301             setAttrib(NSOpenGLPFASamples, fbconfig->samples);
    302         }
    303     }
    304 
    305     // NOTE: All NSOpenGLPixelFormats on the relevant cards support sRGB
    306     //       framebuffer, so there's no need (and no way) to request it
    307 
    308     addAttrib(0);
    309 
    310 #undef addAttrib
    311 #undef setAttrib
    312 
    313     window->context.nsgl.pixelFormat =
    314         [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs];
    315     if (window->context.nsgl.pixelFormat == nil)
    316     {
    317         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
    318                         "NSGL: Failed to find a suitable pixel format");
    319         return GLFW_FALSE;
    320     }
    321 
    322     NSOpenGLContext* share = nil;
    323 
    324     if (ctxconfig->share)
    325         share = ctxconfig->share->context.nsgl.object;
    326 
    327     window->context.nsgl.object =
    328         [[NSOpenGLContext alloc] initWithFormat:window->context.nsgl.pixelFormat
    329                                    shareContext:share];
    330     if (window->context.nsgl.object == nil)
    331     {
    332         _glfwInputError(GLFW_VERSION_UNAVAILABLE,
    333                         "NSGL: Failed to create OpenGL context");
    334         return GLFW_FALSE;
    335     }
    336 
    337     if (fbconfig->transparent)
    338     {
    339         GLint opaque = 0;
    340         [window->context.nsgl.object setValues:&opaque
    341                                   forParameter:NSOpenGLContextParameterSurfaceOpacity];
    342     }
    343 
    344     [window->ns.view setWantsBestResolutionOpenGLSurface:window->ns.retina];
    345 
    346     [window->context.nsgl.object setView:window->ns.view];
    347 
    348     window->context.makeCurrent = makeContextCurrentNSGL;
    349     window->context.swapBuffers = swapBuffersNSGL;
    350     window->context.swapInterval = swapIntervalNSGL;
    351     window->context.extensionSupported = extensionSupportedNSGL;
    352     window->context.getProcAddress = getProcAddressNSGL;
    353     window->context.destroy = destroyContextNSGL;
    354 
    355     return GLFW_TRUE;
    356 }
    357 
    358 
    359 //////////////////////////////////////////////////////////////////////////
    360 //////                        GLFW native API                       //////
    361 //////////////////////////////////////////////////////////////////////////
    362 
    363 GLFWAPI id glfwGetNSGLContext(GLFWwindow* handle)
    364 {
    365     _GLFWwindow* window = (_GLFWwindow*) handle;
    366     _GLFW_REQUIRE_INIT_OR_RETURN(nil);
    367 
    368     if (window->context.client == GLFW_NO_API)
    369     {
    370         _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
    371         return nil;
    372     }
    373 
    374     return window->context.nsgl.object;
    375 }
    376