src/glx/apple/apple_visual.c

   1 /*
   2  Copyright (c) 2008, 2009 Apple Inc.
   3
   4  Permission is hereby granted, free of charge, to any person
   5  obtaining a copy of this software and associated documentation files
   6  (the "Software"), to deal in the Software without restriction,
   7  including without limitation the rights to use, copy, modify, merge,
   8  publish, distribute, sublicense, and/or sell copies of the Software,
   9  and to permit persons to whom the Software is furnished to do so,
  10  subject to the following conditions:
  11
  12  The above copyright notice and this permission notice shall be
  13  included in all copies or substantial portions of the Software.
  14
  15  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  NONINFRINGEMENT.  IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
  19  HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  DEALINGS IN THE SOFTWARE.
  23
  24  Except as contained in this notice, the name(s) of the above
  25  copyright holders shall not be used in advertising or otherwise to
  26  promote the sale, use or other dealings in this Software without
  27  prior written authorization.
  28 */
  29
  30 #include <stdbool.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <assert.h>
  34 #include <GL/gl.h>
  35
  36 /* <rdar://problem/6953344> */
  37 #define glTexImage1D glTexImage1D_OSX
  38 #define glTexImage2D glTexImage2D_OSX
  39 #define glTexImage3D glTexImage3D_OSX
  40 #include <OpenGL/OpenGL.h>
  41 #include <OpenGL/CGLContext.h>
  42 #include <OpenGL/CGLRenderers.h>
  43 #include <OpenGL/CGLTypes.h>
  44 #undef glTexImage1D
  45 #undef glTexImage2D
  46 #undef glTexImage3D
  47
  48 #ifndef kCGLPFAOpenGLProfile
  49 #define kCGLPFAOpenGLProfile 99
  50 #endif
  51
  52 #ifndef kCGLOGLPVersion_3_2_Core
  53 #define kCGLOGLPVersion_3_2_Core 0x3200
  54 #endif
  55
  56 #include "apple_cgl.h"
  57 #include "apple_visual.h"
  58 #include "apple_glx.h"
  59 #include "glxconfig.h"
  60
  61 enum
  62 {
  63    MAX_ATTR = 60
  64 };
  65
  66 void
  67 apple_visual_create_pfobj(CGLPixelFormatObj * pfobj, const struct glx_config * mode,
  68                           bool * double_buffered, bool * uses_stereo,
  69                           bool offscreen)
  70 {
  71    CGLPixelFormatAttribute attr[MAX_ATTR];
  72    int numattr = 0;
  73    GLint vsref = 0;
  74    CGLError error = 0;
  75
  76    /* Request an OpenGL 3.2 profile if one is available and supported */
  77    attr[numattr++] = kCGLPFAOpenGLProfile;
  78    attr[numattr++] = kCGLOGLPVersion_3_2_Core;
  79
  80    /* Test for kCGLPFAOpenGLProfile support at runtime and roll it out if not supported */
  81    attr[numattr] = 0;
  82    error = apple_cgl.choose_pixel_format(attr, pfobj, &vsref);
  83    if (error == kCGLBadAttribute)
  84       numattr -= 2;
  85
  86    if (offscreen) {
  87       apple_glx_diagnostic
  88          ("offscreen rendering enabled.  Using kCGLPFAOffScreen\n");
  89
  90       attr[numattr++] = kCGLPFAOffScreen;
  91       attr[numattr++] = kCGLPFAColorSize;
  92       attr[numattr++] = 32;
  93    }
  94    else if (getenv("LIBGL_ALWAYS_SOFTWARE") != NULL) {
  95       apple_glx_diagnostic
  96          ("Software rendering requested.  Using kCGLRendererGenericFloatID.\n");
  97       attr[numattr++] = kCGLPFARendererID;
  98       attr[numattr++] = kCGLRendererGenericFloatID;
  99    }
 100    else if (getenv("LIBGL_ALLOW_SOFTWARE") != NULL) {
 101       apple_glx_diagnostic
 102          ("Software rendering is not being excluded.  Not using kCGLPFAAccelerated.\n");
 103    }
 104    else {
 105       attr[numattr++] = kCGLPFAAccelerated;
 106    }
 107
 108    /*
 109     * The program chose a config based on the fbconfigs or visuals.
 110     * Those are based on the attributes from CGL, so we probably
 111     * do want the closest match for the color, depth, and accum.
 112     */
 113    attr[numattr++] = kCGLPFAClosestPolicy;
 114
 115    if (mode->stereoMode) {
 116       attr[numattr++] = kCGLPFAStereo;
 117       *uses_stereo = true;
 118    }
 119    else {
 120       *uses_stereo = false;
 121    }
 122
 123    if (!offscreen && mode->doubleBufferMode) {
 124       attr[numattr++] = kCGLPFADoubleBuffer;
 125       *double_buffered = true;
 126    }
 127    else {
 128       *double_buffered = false;
 129    }
 130
 131    attr[numattr++] = kCGLPFAColorSize;
 132    attr[numattr++] = mode->redBits + mode->greenBits + mode->blueBits;
 133    attr[numattr++] = kCGLPFAAlphaSize;
 134    attr[numattr++] = mode->alphaBits;
 135
 136    if ((mode->accumRedBits + mode->accumGreenBits + mode->accumBlueBits) > 0) {
 137       attr[numattr++] = kCGLPFAAccumSize;
 138       attr[numattr++] = mode->accumRedBits + mode->accumGreenBits +
 139          mode->accumBlueBits + mode->accumAlphaBits;
 140    }
 141
 142    if (mode->depthBits > 0) {
 143       attr[numattr++] = kCGLPFADepthSize;
 144       attr[numattr++] = mode->depthBits;
 145    }
 146
 147    if (mode->stencilBits > 0) {
 148       attr[numattr++] = kCGLPFAStencilSize;
 149       attr[numattr++] = mode->stencilBits;
 150    }
 151
 152    if (mode->sampleBuffers > 0) {
 153       attr[numattr++] = kCGLPFAMultisample;
 154       attr[numattr++] = kCGLPFASampleBuffers;
 155       attr[numattr++] = mode->sampleBuffers;
 156       attr[numattr++] = kCGLPFASamples;
 157       attr[numattr++] = mode->samples;
 158    }
 159
 160    attr[numattr++] = 0;
 161
 162    assert(numattr < MAX_ATTR);
 163
 164    error = apple_cgl.choose_pixel_format(attr, pfobj, &vsref);
 165
 166    if (error) {
 167       fprintf(stderr, "error: %s\n", apple_cgl.error_string(error));
 168       abort();
 169    }
 170
 171    if (!*pfobj) {
 172       fprintf(stderr, "No matching pixelformats found, perhaps try using LIBGL_ALLOW_SOFTWARE\n");
 173       abort();
 174    }
 175 }