is there any metho to save a texture into an image

OpenGL OpenGL: Basic Coding
1

I used glTexImage2D to construct a texture from a matrix:


float myMatrix[Height][Width][4];
... ...
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 
GL_LINE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, 
GL_LINE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE ); 

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Width, Height,
 0, GL_RGBA, GL_FLOAT, myMatrix);

How can I check if the values of myMatrix have been correctly saved into this texture?

BTW, is there any wrong with the parameters for glTexParameteri?

2

What is purpose of the code? what is that matrix?

  • MIN & MAG Filter: it should be GL_LINEAR… or meybe GL_NEAREST if you are performing some computation not rendering

how can you check values?

  • just render that texture and by its coulour you coul gess are those values are good or wrong. That is simple method.
  • you can use gEDebugger to check data that you have on the GPU
3

that matrix saves the values of a 2D function, I want to send that texture to a shader and do some computation there.

And I have difficulty in understanding the internal format and format, which indicates the format of the texture?

4

so maybe you should use OpenCL instead of OpenGL. They both work well with each other.