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[AptypR]

I tried to compile example,given in this(http://browndeertechnology.com/docs/BDT_OpenCL_Tutorial_NBody.html) article,but i just got error nbody_output.c:14: error: invalid operands to binary + (have ‘cl_float4’ and ‘cl_float4&rsquo
nbody_output.c:16: error: invalid operands to binary / (have ‘cl_float4’ and ‘cl_float4&rsquo

nbody_output.c was changed a little,and now look like

/* nbody_output.c */ #include <stdio.h> #include <stdcl.h> void nbody_output( int n, cl_float4* pos ) { int i; cl_float4 ave_pos = (cl_float4){0.0f,0.0f,0.0f,0.0f}; for(i=0;i<n;i++) ave_pos+=pos; ave_pos/=(cl_float4){n,n,n,n}; printf("ave_pos = {%e,%e,%e}\n", cl_float4_x(ave_pos),cl_float4_y(ave_pos),cl_float4_z(ave_pos) ); }

[genaganna]

Originally posted by: AptypR I tried to compile example,given in this(http://browndeertechnology.com/docs/BDT_OpenCL_Tutorial_NBody.html) article,but i just got error nbody_output.c:14: error: invalid operands to binary + (have ‘cl_float4’ and ‘cl_float4&rsquo nbody_output.c:16: error: invalid operands to binary / (have ‘cl_float4’ and ‘cl_float4&rsquo

nbody_output.c was changed a little,and now look like

Please check whether + and / operators supported on cl_float4 in stdcl.h or not.

[dar]

Originally posted by: genaganna

Originally posted by: AptypR I tried to compile example,given in this(http://browndeertechnology.com/docs/BDT_OpenCL_Tutorial_NBody.html) article,but i just got error nbody_output.c:14: error: invalid operands to binary + (have ‘cl_float4’ and ‘cl_float4&rsquo nbody_output.c:16: error: invalid operands to binary / (have ‘cl_float4’ and ‘cl_float4&rsquo

nbody_output.c was changed a little,and now look like

Please check whether + and / operators supported on cl_float4 in stdcl.h or not.

[dar]

Originally posted by: dar

Originally posted by: genaganna

Originally posted by: AptypR I tried to compile example,given in this(http://browndeertechnology.com/docs/BDT_OpenCL_Tutorial_NBody.html) article,but i just got error nbody_output.c:14: error: invalid operands to binary + (have ‘cl_float4’ and ‘cl_float4&rsquo nbody_output.c:16: error: invalid operands to binary / (have ‘cl_float4’ and ‘cl_float4&rsquo

nbody_output.c was changed a little,and now look like

Please check whether + and / operators supported on cl_float4 in stdcl.h or not.

[jross]

AptypR,

I believe what dar, the libstdcl developer, was trying to say using an iPhone4 was that the tutorial was written using the beta4 version of OpenCL.  The original version did compile and run.  Expect the tutorial code to be updated on the website in the next couple of hours or days and in the mean time, you can try component-wise addition and division like this:

/* nbody_output.c */ #include <stdio.h> #include <stdcl.h> void nbody_output( int n, cl_float4* pos, cl_float4* vel ) { int i; cl_float4 center = (cl_float4){0.0f,0.0f,0.0f,0.0f}; for(i=0;i<n;i++) { cl_float4_x(center) += cl_float4_x(pos); cl_float4_y(center) += cl_float4_y(pos); cl_float4_z(center) += cl_float4_z(pos); cl_float4_w(center) += cl_float4_w(pos); } cl_float4_x(center) /= n; cl_float4_y(center) /= n; cl_float4_z(center) /= n; cl_float4_w(center) /= n; printf("ave_pos => {%f,%f,%f}\n", cl_float4_x(center),cl_float4_y(center),cl_float4_z(center) ); }

[AptypR]

Thanks for answer,I'll try it.

[AptypR]

I did what you said.

now it crashes with "segmentation fault":-)

[dar]

a new version of libstdcl is being released wihin next few days that works against the latest SDK.  improved documentation, other improvements.  tutorial is also being updated with extension to multiple-GPUs.  check the website in a day or so. 

[dar]

Tutorial was recently updated, now includes discussion of using two GPUs.

New release of libstdcl is available, now distributed as part of coprthr SDK v1.0-RC2.  Can be downloaded from here http://www.browndeertechnology.com/coprthr.html

If you download coprthr SDK you will get everything now, includes tutorial, tutorial code and a new ref manual for STDCL that is also available online.

Also include NBody demo with display.  More will be included in v1.1 soon.

Tutorial code was tested agains the ATI SDK v2.1, Catalyst 10.3 running on CentOS 5.4 with a Radeon 5870 and 5970.

Let me know if you have trouble.