Is there a shaderless way to draw multiple points with different sizes using glDrawArrays()?

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I'm drawing a point cloud with different colors of points with this:

    glEnableClientState(GL_VERTEX_ARRAY);

    glEnableClientState(GL_COLOR_ARRAY);





    glVertexPointer(3, GL_FLOAT, 0, vertices.get());

    glColorPointer(3, GL_FLOAT, 0, colors.get());





    glDrawArrays(GL_POINTS, 0, n);





    glDisableClientState(GL_VERTEX_ARRAY);

    glDisableClientState(GL_COLOR_ARRAY);

is there a way to tell glDrawArrays (or the default shader) to use another client state for size of each point?

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

There is no default shader. And the fixed function pipeline (deprecated for several years) does not support individual point sizes. You should not use it anyway unless you have a good reason to do so.
– Nico Schertler
Nov 21 at 11:26

I searched for a hello-world of VBO for point clouds but couldn't find any info. Then saw this and worked but without size unfortunately. Do you mean deprecated fixed function pipeline is used when glDrawArrays or glEnableClientState is used? Before this, I was using immediate mode with smooth point size and correct auto z-ordering. But immediate mode is way too slow for a million points.
– huseyin tugrul buyukisik
Nov 21 at 11:28

As soon as you don't have a shader bound, OpenGL will try to use the fixed function pipeline if it is still available. This does not work if you have a core profile context. So, in short: Always use a shader.
– Nico Schertler
Nov 21 at 11:30

What kind of question should I ask for a minimal shader example for glDrawArrays with GL_POINTS? What should I use? Vertex shader or fragment shader or something else?
– huseyin tugrul buyukisik
Nov 21 at 11:33

You will need both shaders. I would suggest to take a look at an arbitrary tutorial for model rendering (with modern OpenGL). If you know how to do this, then switching to pointclouds is simply a matter of replacing GL_TRIANGLES with GL_POINTS. More or less...
– Nico Schertler
Nov 21 at 11:36

add a comment |

up vote
0
down vote

favorite

I'm drawing a point cloud with different colors of points with this:

    glEnableClientState(GL_VERTEX_ARRAY);

    glEnableClientState(GL_COLOR_ARRAY);





    glVertexPointer(3, GL_FLOAT, 0, vertices.get());

    glColorPointer(3, GL_FLOAT, 0, colors.get());





    glDrawArrays(GL_POINTS, 0, n);





    glDisableClientState(GL_VERTEX_ARRAY);

    glDisableClientState(GL_COLOR_ARRAY);

is there a way to tell glDrawArrays (or the default shader) to use another client state for size of each point?

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

There is no default shader. And the fixed function pipeline (deprecated for several years) does not support individual point sizes. You should not use it anyway unless you have a good reason to do so.
– Nico Schertler
Nov 21 at 11:26

I searched for a hello-world of VBO for point clouds but couldn't find any info. Then saw this and worked but without size unfortunately. Do you mean deprecated fixed function pipeline is used when glDrawArrays or glEnableClientState is used? Before this, I was using immediate mode with smooth point size and correct auto z-ordering. But immediate mode is way too slow for a million points.
– huseyin tugrul buyukisik
Nov 21 at 11:28

As soon as you don't have a shader bound, OpenGL will try to use the fixed function pipeline if it is still available. This does not work if you have a core profile context. So, in short: Always use a shader.
– Nico Schertler
Nov 21 at 11:30

What kind of question should I ask for a minimal shader example for glDrawArrays with GL_POINTS? What should I use? Vertex shader or fragment shader or something else?
– huseyin tugrul buyukisik
Nov 21 at 11:33

You will need both shaders. I would suggest to take a look at an arbitrary tutorial for model rendering (with modern OpenGL). If you know how to do this, then switching to pointclouds is simply a matter of replacing GL_TRIANGLES with GL_POINTS. More or less...
– Nico Schertler
Nov 21 at 11:36

add a comment |

up vote
0
down vote

favorite

I'm drawing a point cloud with different colors of points with this:

    glEnableClientState(GL_VERTEX_ARRAY);

    glEnableClientState(GL_COLOR_ARRAY);





    glVertexPointer(3, GL_FLOAT, 0, vertices.get());

    glColorPointer(3, GL_FLOAT, 0, colors.get());





    glDrawArrays(GL_POINTS, 0, n);





    glDisableClientState(GL_VERTEX_ARRAY);

    glDisableClientState(GL_COLOR_ARRAY);

is there a way to tell glDrawArrays (or the default shader) to use another client state for size of each point?

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

I'm drawing a point cloud with different colors of points with this:

    glEnableClientState(GL_VERTEX_ARRAY);

    glEnableClientState(GL_COLOR_ARRAY);





    glVertexPointer(3, GL_FLOAT, 0, vertices.get());

    glColorPointer(3, GL_FLOAT, 0, colors.get());





    glDrawArrays(GL_POINTS, 0, n);





    glDisableClientState(GL_VERTEX_ARRAY);

    glDisableClientState(GL_COLOR_ARRAY);

is there a way to tell glDrawArrays (or the default shader) to use another client state for size of each point?

opengl

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

asked Nov 21 at 11:23

huseyin tugrul buyukisik

6,85932963

There is no default shader. And the fixed function pipeline (deprecated for several years) does not support individual point sizes. You should not use it anyway unless you have a good reason to do so.
– Nico Schertler
Nov 21 at 11:26

I searched for a hello-world of VBO for point clouds but couldn't find any info. Then saw this and worked but without size unfortunately. Do you mean deprecated fixed function pipeline is used when glDrawArrays or glEnableClientState is used? Before this, I was using immediate mode with smooth point size and correct auto z-ordering. But immediate mode is way too slow for a million points.
– huseyin tugrul buyukisik
Nov 21 at 11:28

As soon as you don't have a shader bound, OpenGL will try to use the fixed function pipeline if it is still available. This does not work if you have a core profile context. So, in short: Always use a shader.
– Nico Schertler
Nov 21 at 11:30

What kind of question should I ask for a minimal shader example for glDrawArrays with GL_POINTS? What should I use? Vertex shader or fragment shader or something else?
– huseyin tugrul buyukisik
Nov 21 at 11:33

You will need both shaders. I would suggest to take a look at an arbitrary tutorial for model rendering (with modern OpenGL). If you know how to do this, then switching to pointclouds is simply a matter of replacing GL_TRIANGLES with GL_POINTS. More or less...
– Nico Schertler
Nov 21 at 11:36

add a comment |

There is no default shader. And the fixed function pipeline (deprecated for several years) does not support individual point sizes. You should not use it anyway unless you have a good reason to do so.
– Nico Schertler
Nov 21 at 11:26

I searched for a hello-world of VBO for point clouds but couldn't find any info. Then saw this and worked but without size unfortunately. Do you mean deprecated fixed function pipeline is used when glDrawArrays or glEnableClientState is used? Before this, I was using immediate mode with smooth point size and correct auto z-ordering. But immediate mode is way too slow for a million points.
– huseyin tugrul buyukisik
Nov 21 at 11:28

As soon as you don't have a shader bound, OpenGL will try to use the fixed function pipeline if it is still available. This does not work if you have a core profile context. So, in short: Always use a shader.
– Nico Schertler
Nov 21 at 11:30

What kind of question should I ask for a minimal shader example for glDrawArrays with GL_POINTS? What should I use? Vertex shader or fragment shader or something else?
– huseyin tugrul buyukisik
Nov 21 at 11:33

You will need both shaders. I would suggest to take a look at an arbitrary tutorial for model rendering (with modern OpenGL). If you know how to do this, then switching to pointclouds is simply a matter of replacing GL_TRIANGLES with GL_POINTS. More or less...
– Nico Schertler
Nov 21 at 11:36

There is no default shader. And the fixed function pipeline (deprecated for several years) does not support individual point sizes. You should not use it anyway unless you have a good reason to do so.
– Nico Schertler
Nov 21 at 11:26

I searched for a hello-world of VBO for point clouds but couldn't find any info. Then saw this and worked but without size unfortunately. Do you mean deprecated fixed function pipeline is used when glDrawArrays or glEnableClientState is used? Before this, I was using immediate mode with smooth point size and correct auto z-ordering. But immediate mode is way too slow for a million points.
– huseyin tugrul buyukisik
Nov 21 at 11:28

As soon as you don't have a shader bound, OpenGL will try to use the fixed function pipeline if it is still available. This does not work if you have a core profile context. So, in short: Always use a shader.
– Nico Schertler
Nov 21 at 11:30

What kind of question should I ask for a minimal shader example for glDrawArrays with GL_POINTS? What should I use? Vertex shader or fragment shader or something else?
– huseyin tugrul buyukisik
Nov 21 at 11:33

You will need both shaders. I would suggest to take a look at an arbitrary tutorial for model rendering (with modern OpenGL). If you know how to do this, then switching to pointclouds is simply a matter of replacing GL_TRIANGLES with GL_POINTS. More or less...
– Nico Schertler
Nov 21 at 11:36

add a comment |

1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

If there was, that would be terribly inefficient!

Use the programmable pipeline, in a core context => OpenGL 3.3 and above.

Create a buffer with all your vertices (your points).

Create a buffer with the sizes of each point.

Pass buffers 2 and 3 to your vertex shader. Assign the size to the global gl_PointSize.

If you don't get what I am suggesting, you must then begin by learning the modern OpenGL way of rendering :)

answered Nov 21 at 12:55

Zedka29

792

Thank you. I managed to get past size-less version of shaders now doing this size array extension. Doesn't accept, maybe I'm on GL 3.0-.
– huseyin tugrul buyukisik
Nov 21 at 13:44

Ok, now it works with glEnable( GL_PROGRAM_POINT_SIZE );, thank you. So many states to manage! :] Also added #version 330 at first line, just in case it compiles for different version.
– huseyin tugrul buyukisik
Nov 21 at 13:51

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
1
down vote

accepted

If there was, that would be terribly inefficient!

Use the programmable pipeline, in a core context => OpenGL 3.3 and above.

Create a buffer with all your vertices (your points).

Create a buffer with the sizes of each point.

Pass buffers 2 and 3 to your vertex shader. Assign the size to the global gl_PointSize.

If you don't get what I am suggesting, you must then begin by learning the modern OpenGL way of rendering :)

answered Nov 21 at 12:55

Zedka29

792

Thank you. I managed to get past size-less version of shaders now doing this size array extension. Doesn't accept, maybe I'm on GL 3.0-.
– huseyin tugrul buyukisik
Nov 21 at 13:44

Ok, now it works with glEnable( GL_PROGRAM_POINT_SIZE );, thank you. So many states to manage! :] Also added #version 330 at first line, just in case it compiles for different version.
– huseyin tugrul buyukisik
Nov 21 at 13:51

add a comment |

up vote
1
down vote

accepted

If there was, that would be terribly inefficient!

Use the programmable pipeline, in a core context => OpenGL 3.3 and above.

Create a buffer with all your vertices (your points).

Create a buffer with the sizes of each point.

Pass buffers 2 and 3 to your vertex shader. Assign the size to the global gl_PointSize.

If you don't get what I am suggesting, you must then begin by learning the modern OpenGL way of rendering :)

answered Nov 21 at 12:55

Zedka29

792

Thank you. I managed to get past size-less version of shaders now doing this size array extension. Doesn't accept, maybe I'm on GL 3.0-.
– huseyin tugrul buyukisik
Nov 21 at 13:44

Ok, now it works with glEnable( GL_PROGRAM_POINT_SIZE );, thank you. So many states to manage! :] Also added #version 330 at first line, just in case it compiles for different version.
– huseyin tugrul buyukisik
Nov 21 at 13:51

add a comment |

up vote
1
down vote

accepted

If there was, that would be terribly inefficient!

Use the programmable pipeline, in a core context => OpenGL 3.3 and above.

Create a buffer with all your vertices (your points).

Create a buffer with the sizes of each point.

Pass buffers 2 and 3 to your vertex shader. Assign the size to the global gl_PointSize.

If you don't get what I am suggesting, you must then begin by learning the modern OpenGL way of rendering :)

answered Nov 21 at 12:55

Zedka29

792

If there was, that would be terribly inefficient!

Use the programmable pipeline, in a core context => OpenGL 3.3 and above.

Create a buffer with all your vertices (your points).

Create a buffer with the sizes of each point.

Pass buffers 2 and 3 to your vertex shader. Assign the size to the global gl_PointSize.

If you don't get what I am suggesting, you must then begin by learning the modern OpenGL way of rendering :)

answered Nov 21 at 12:55

Zedka29

792

answered Nov 21 at 12:55

Zedka29

792

answered Nov 21 at 12:55

Zedka29

792

answered Nov 21 at 12:55

Zedka29

792

Thank you. I managed to get past size-less version of shaders now doing this size array extension. Doesn't accept, maybe I'm on GL 3.0-.
– huseyin tugrul buyukisik
Nov 21 at 13:44

Ok, now it works with glEnable( GL_PROGRAM_POINT_SIZE );, thank you. So many states to manage! :] Also added #version 330 at first line, just in case it compiles for different version.
– huseyin tugrul buyukisik
Nov 21 at 13:51

add a comment |

Thank you. I managed to get past size-less version of shaders now doing this size array extension. Doesn't accept, maybe I'm on GL 3.0-.
– huseyin tugrul buyukisik
Nov 21 at 13:44

Ok, now it works with glEnable( GL_PROGRAM_POINT_SIZE );, thank you. So many states to manage! :] Also added #version 330 at first line, just in case it compiles for different version.
– huseyin tugrul buyukisik
Nov 21 at 13:51

Thank you. I managed to get past size-less version of shaders now doing this size array extension. Doesn't accept, maybe I'm on GL 3.0-.
– huseyin tugrul buyukisik
Nov 21 at 13:44

Ok, now it works with glEnable( GL_PROGRAM_POINT_SIZE );, thank you. So many states to manage! :] Also added #version 330 at first line, just in case it compiles for different version.
– huseyin tugrul buyukisik
Nov 21 at 13:51

add a comment |

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