Re: writing a new GUI environment

4 May 2005

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On May 4, 2005, at 1:36 PM, Erich Ocean wrote:
#include <OpenGL/OpenGL.h>
int main (int argc, const char * argv[]) {
    long value;
    long renders;
    CGLRendererInfoObj renderInfo;
    CGLQueryRendererInfo(1, &renderInfo, &renders);
    if (renders != 0)
    {
        printf("Render Info:\n\tnumberOfRenders = %ld\n", renders);
        CGLDestroyRendererInfo(renderInfo);
    }
    return 0;
}
[Session started at 2005-05-04 14:23:35 -0700.]
Render Info:
    numberOfRenders = 3
    Render 0x00022404 [0] :
        kCGLRPAccelerated = 1
        kCGLRPFullScreen = 1
        kCGLRPWindow = 1
        kCGLRPBufferModes = 0x0000000f
        kCGLRPColorModes = 0x00008400
        kCGLRPDepthModes = 0x00000c01
        kCGLRPAccumModes = 0x00808000
        kCGLRPStencilModes = 0x00000080
        kCGLRPMaxSampleBuffers = 1
        kCGLRPMaxSamples = 4
        kCGLRPVideoMemory = 268435456 [256.00 MB]
        kCGLRPTextureMemory = 242024448 [230.81 MB]
    Render 0x00020200 [1] :
        kCGLRPAccelerated = 0
        kCGLRPFullScreen = 0
        kCGLRPWindow = 1
        kCGLRPBufferModes = 0x0000000d
        kCGLRPColorModes = 0x0000ca00
        kCGLRPDepthModes = 0x00001401
        kCGLRPAccumModes = 0x00c0c000
        kCGLRPStencilModes = 0x00000081
        kCGLRPMaxSampleBuffers = 0
        kCGLRPMaxSamples = 0
        kCGLRPVideoMemory = 0 [0.00 MB]
        kCGLRPTextureMemory = 0 [0.00 MB]
    Render 0x00020400 [2] :
        kCGLRPAccelerated = 0
        kCGLRPFullScreen = 0
        kCGLRPWindow = 1
        kCGLRPBufferModes = 0x0000000d
        kCGLRPColorModes = 0x0c0fc000
        kCGLRPDepthModes = 0x00001000
        kCGLRPAccumModes = 0x08808000
        kCGLRPStencilModes = 0x00000081
        kCGLRPMaxSampleBuffers = 1
        kCGLRPMaxSamples = 16
        kCGLRPVideoMemory = 0 [0.00 MB]
        kCGLRPTextureMemory = 0 [0.00 MB]
CGLTest has exited with status 0.
-Shawn

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On May 4, 2005, at 1:59 PM, Erich Ocean wrote:

On May 4, 2005, at 1:46 PM, Shawn Erickson wrote:

Mac OS X supports three (or perhaps four or five) distinct GUI
enviroments: Carbon, Cocoa, Java, and perhaps QuickTime and OpenGL.

OpenGL => NSGL, AGL, CGL or GLUT (<http://developer.apple.com/qa/
qa2001/qa1269.html>)

CGL looks like it *should* be low-level, but in fact, it's only
accessible via Carbon or Cocoa:

No you can use it without linking against Carbon or Cocoa, just link
against the OpenGL.framework.
        int i;

        for (i = 0; i < renders; i++)

        {

            CGLDescribeRenderer(renderInfo, i, kCGLRPRendererID,
&value);

            printf("\tRender 0x%08x [%d] :\n", value, i);

            CGLDescribeRenderer(renderInfo, i, kCGLRPAccelerated,
&value);

            printf("\t\tkCGLRPAccelerated = %d\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPFullScreen,
&value);

            printf("\t\tkCGLRPFullScreen = %d\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPWindow, &value);

            printf("\t\tkCGLRPWindow = %d\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPBufferModes,
&value);

            printf("\t\tkCGLRPBufferModes = 0x%08x\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPColorModes,
&value);

            printf("\t\tkCGLRPColorModes = 0x%08x\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPDepthModes,
&value);

            printf("\t\tkCGLRPDepthModes = 0x%08x\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPAccumModes,
&value);

            printf("\t\tkCGLRPAccumModes = 0x%08x\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPStencilModes,
&value);

            printf("\t\tkCGLRPStencilModes = 0x%08x\n", value);

            CGLDescribeRenderer(renderInfo, i,
kCGLRPMaxSampleBuffers, &value);

            printf("\t\tkCGLRPMaxSampleBuffers = %d\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPMaxSamples,
&value);

            printf("\t\tkCGLRPMaxSamples = %d\n", value);

            CGLDescribeRenderer(renderInfo, i, kCGLRPVideoMemory,
&value);

            printf("\t\tkCGLRPVideoMemory = %d [%.2f MB]\n", value,
value / (1024.0 * 1024.0));

            CGLDescribeRenderer(renderInfo, i, kCGLRPTextureMemory,
&value);

            printf("\t\tkCGLRPTextureMemory = %d [%.2f MB]\n",
value, value / (1024.0 * 1024.0));

        }
If you want to take over the whole the screen then you could just
use OpenGL (CGL) and Quartz and do all your own drawing.

I'd like to use CGL *without* Carbon or Cocoa; I'm perfectly happy
doing my own window management, so the full-screen thing would
work. (It would be *nice* to be a full citizen in Mac OS X, but
since this is for educational purposes, I can live with that.)

You would use Quartz Services to understand, managed, and capture
displays.

<http://developer.apple.com/documentation/GraphicsImaging/Reference/
Quartz_Services_Ref>
What I'm concerned about is receiving keyboard and mouse events
without having Carbon or Cocoa linked in. I'm getting the
impression that that isn't possible.

Getting events would be interesting but you can likely do it without
using Carbon or Cocoa, etc. but it would take work. Not sure myself
how you would do it but interfacing with HID down closer to IOKit may
do it.
This email sent to site_archiver@lists.apple.com

Shawn Erickson

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