I had a similar problem while trying to run a vertex program/fragment
shader (written in Cg) on my G4. The pixels didn't appear, although I
had selected the ARB profiles for the Cg. After some searching, I
found that there is a simple explanation : the GeForce 2, 3 and 4
don't support fragment shaders. I'm not whether or not you use
fragment shaders here, but if you do, then the vertex program can be
used in ARB, but the fragment shader can't (launch X11 and type
glxinfo, you'll see that there is no fragment shader extension).
Which brings me to another question I have... I have a GeForce 2MX and
I'm willing to use Cg on my Mac... One solution I considered was
buying a Radeon 9200 PCI (which would allow me to have dual display
;). Still I'm not sure about 2 things :
- what card will the Cg select if I have 2 (the geforce on agp slot
and the radeon on pci slot) ? Can I force that to the pci card ?
- can I run vertex programs and fragment shaders on the radeon 9200,
since it's no nVidia card ?
Anyone has ideas about that ?
Fred
On Dec 18, 2004, at 6:46 AM, Chris Bergmann wrote:
Hi guys,
Since upgrading to 10.3.7 on my G4 MP with GeForce4ti 4600, I've
noticed that anything I try to render using an ARB vertex shader
fails without causing a GL error. I'm wondering if anyone else has
seen this or has any ideas, before I file a defect report with apple.
At first I thought it must have been a bug introduced in the program
which I hadn't noticed, but the program still runs fine on the other
test machines (laptop with GeForce Go5200, laptop with radeon
mobility, windows boxen with x800.
The symptoms are that the meshes rendered while an ARB vertex program
is bound are not visible; they still appear to affect the zbuffer but
not the color buffer. No GL errors are reported that I've noticed.
I've dumped the vertex program into the shader builder, but it
appears the shader builder no longer works on my machine either - no
error, but nothing rendered other than the axis lines. I tried a null
program and also some of the apple vertex examples which used to
work.
The "Vertex Optimization" sample also fails to render when in "Vertex
Program" mode, though I haven't tried this sample prior to installing
this OS version.
any thoughts?
chris
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