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 #undef glTexImage1D
  44 #undef glTexImage2D
  45 #undef glTexImage3D
  46
  47 #include "apple_cgl.h"
  48 #include "apple_visual.h"
  49 #include "apple_glx.h"
  50 #include "glxconfig.h"
  51
  52 enum
  53 {
  54    MAX_ATTR = 60
  55 };
  56
  57 void
  58 apple_visual_create_pfobj(CGLPixelFormatObj * pfobj, const struct glx_config * mode,
  59                           bool * double_buffered, bool * uses_stereo,
  60                           bool offscreen)
  61 {
  62    CGLPixelFormatAttribute attr[MAX_ATTR];
  63    int numattr = 0;
  64    GLint vsref = 0;
  65    CGLError error = 0;
  66
  67    if (offscreen) {
  68       apple_glx_diagnostic
  69          ("offscreen rendering enabled.  Using kCGLPFAOffScreen\n");
  70
  71       attr[numattr++] = kCGLPFAOffScreen;
  72       attr[numattr++] = kCGLPFAColorSize;
  73       attr[numattr++] = 32;
  74    }
  75    else if (getenv("LIBGL_ALWAYS_SOFTWARE") != NULL) {
  76       apple_glx_diagnostic
  77          ("Software rendering requested.  Using kCGLRendererGenericFloatID.\n");
  78       attr[numattr++] = kCGLPFARendererID;
  79       attr[numattr++] = kCGLRendererGenericFloatID;
  80    }
  81    else if (getenv("LIBGL_ALLOW_SOFTWARE") != NULL) {
  82       apple_glx_diagnostic
  83          ("Software rendering is not being excluded.  Not using kCGLPFAAccelerated.\n");
  84    }
  85    else {
  86       attr[numattr++] = kCGLPFAAccelerated;
  87    }
  88
  89    /*
  90     * The program chose a config based on the fbconfigs or visuals.
  91     * Those are based on the attributes from CGL, so we probably
  92     * do want the closest match for the color, depth, and accum.
  93     */
  94    attr[numattr++] = kCGLPFAClosestPolicy;
  95
  96    if (mode->stereoMode) {
  97       attr[numattr++] = kCGLPFAStereo;
  98       *uses_stereo = true;
  99    }
 100    else {
 101       *uses_stereo = false;
 102    }
 103
 104    if (mode->doubleBufferMode) {
 105       attr[numattr++] = kCGLPFADoubleBuffer;
 106       *double_buffered = true;
 107    }
 108    else {
 109       *double_buffered = false;
 110    }
 111
 112    attr[numattr++] = kCGLPFAColorSize;
 113    attr[numattr++] = mode->redBits + mode->greenBits + mode->blueBits;
 114    attr[numattr++] = kCGLPFAAlphaSize;
 115    attr[numattr++] = mode->alphaBits;
 116
 117    if ((mode->accumRedBits + mode->accumGreenBits + mode->accumBlueBits) > 0) {
 118       attr[numattr++] = kCGLPFAAccumSize;
 119       attr[numattr++] = mode->accumRedBits + mode->accumGreenBits +
 120          mode->accumBlueBits + mode->accumAlphaBits;
 121    }
 122
 123    if (mode->depthBits > 0) {
 124       attr[numattr++] = kCGLPFADepthSize;
 125       attr[numattr++] = mode->depthBits;
 126    }
 127
 128    if (mode->stencilBits > 0) {
 129       attr[numattr++] = kCGLPFAStencilSize;
 130       attr[numattr++] = mode->stencilBits;
 131    }
 132
 133    if (mode->sampleBuffers > 0) {
 134       attr[numattr++] = kCGLPFAMultisample;
 135       attr[numattr++] = kCGLPFASampleBuffers;
 136       attr[numattr++] = mode->sampleBuffers;
 137       attr[numattr++] = kCGLPFASamples;
 138       attr[numattr++] = mode->samples;
 139    }
 140
 141    attr[numattr++] = 0;
 142
 143    assert(numattr < MAX_ATTR);
 144
 145    error = apple_cgl.choose_pixel_format(attr, pfobj, &vsref);
 146
 147    if (error) {
 148       fprintf(stderr, "error: %s\n", apple_cgl.error_string(error));
 149       abort();
 150    }
 151 }