The efficiency of rendering Triangle is too slow on j6entry(with gpu named sgx544)

user4980259

Intellectual 410 points

I write a demo to diaplay 3D model and image mosaicking

The demo contains 130000 trianlges which uses 63-84 ms per frame

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The question is:

Is it reasonable for sgx544 to render so slowly with 130000 triangles?

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To find out the answer of the problem, I write a simple demo using glDrawarray only once,

and get a table below

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Triangle Num | Simple shader | Texture shader | Complex shader

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100 | 16ms | 16ms | 16ms

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1000 | 16ms | 16ms | 16ms

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10000 | 16ms | 16ms | 16ms

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40000 | 33ms | 33ms | 33ms

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80000 | 33ms | 50ms | 50ms

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100000 | 50ms | 50ms | 66ms

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160000 | 83ms | 100ms | 116ms

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200000 | 100ms | 116ms | 133ms

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Unlike GPU on PC, the rendering time is linear with the num of triangle on sgx544

If the efficiency shown by the table above is reasonable, what i can do is to reduce the num of triangle,

if it is unreasonable, I want to konw why?

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Does it has more Efficient api except glDrawArrary ?

How can I use sgx544 properly and explore the full potential of it?

Thank you!

over 8 years ago

0 Yordan Kamenov over 8 years ago

TI__Mastermind 42515 points

Hi,

I have forwarded your question to a SGX/OpenGLES expert.

Can you just clarify what is the version of the SDK you use?

Regards,
Yordan

0 user4980259 over 8 years ago in reply to Yordan Kamenov

Intellectual 410 points

psdk3.2.0.3

0 Anand Balagopalakrishnan over 8 years ago in reply to user4980259

TI__Expert 5130 points

Hi,

Can you please share your example application? We would like to examine it before we come back with recommendations?

Regards,
Anand

0 user4980259 over 8 years ago in reply to Anand Balagopalakrishnan

Intellectual 410 points

I can not give you my application code, because I write a 3D engine to build it which consists of thousands of code.

But the simple testing demo is OK, and attachment contains the whole demo and make file.

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This Demo is modified from the demo in psdk3.2.0, it renders a rectangle which composed of triangles.

I just test the efficiency for glDrawarray with a script called "trinum.txt"

The first number(A) in the script represents the subdivision of the rectangle, thus the triangle number is A*A*2

The second number(B) in the script represents the shader mode for the program,

"1" represents simple shader "2" means texture shader "3" means complex shader

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130000 triangles uses 83ms, is it reasonable?SimpleDemo.rar

0 Subhajit Paul over 8 years ago in reply to user4980259

TI__Expert 7015 points

Hi,

I downloaded the application and ran it on my setup. I could observe similar numbers on my setup.

I also modified the application to enable GL_CULL_FACE and GL_DEPTH_TEST, but could not see any improvements in the numbers.

However, I can say that the increase in the render time is related to increasing the number of triangles, and this behaviour is normal.

Regards,

Subhajit

0 user4980259 over 8 years ago in reply to Subhajit Paul

Intellectual 410 points

Thanks, I must reduce the number of triangles! Get it!

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The efficiency of rendering Triangle is too slow on j6entry(with gpu named sgx544)