Part of the Khronos Group
OpenGL.org

The Industry's Foundation for High Performance Graphics

from games to virtual reality, mobile phones to supercomputers

Search:

Type: Posts; User: Aliii

Page 1 of 2 1 2

Search: Search took 0.00 seconds.

  1. Replies
    0
    Views
    150

    Using OpenGL with SDL

    I want to move my project from Win to Linux. It seems like on Linux its not easy to set up the basic window, message loop, input handling, ...so I was thinking about using SDL.
    Im hearing things...
  2. Replies
    11
    Views
    991

    Thanks for the clarification! I see that...

    Thanks for the clarification! I see that glTexStorage is superior, I just want to stick to OpenGL3.3 for now.
    I didnt know about glGenerateMipmap. Is there any reason not to use it and upload the...
  3. Replies
    11
    Views
    991

    Thanks for the answers! I still dont understand...

    Thanks for the answers! I still dont understand the difference here between glTexImage and glTexSubImage. Does glTexImage define only 1 mip-map level for the given texture? It says "glTexImage3D —...
  4. Replies
    11
    Views
    991

    Array Texture confusion

    I want to make an array-texture from 2D textures with mipmaps, but Im confused.

    This is one of the "tutorials" I looked at:
    https://www.opengl.org/wiki/Array_Texture

    Here they use...
  5. The profilers I use:...

    The profilers I use:
    https://code.google.com/p/shinyprofiler/
    http://www.codersnotes.com/sleepy

    To measure certain GL calls ....use a performance counter. Use glFinish to isolate the GL call.
  6. Replies
    2
    Views
    427

    Right way to check for errors

    How should I check for errors? In release mode I cant check them with while(...)glGetError after every single gl call. I can write macros that will only check in debug mode but some important calls...
  7. Thanks! I will try the geom shader approach then.

    Thanks! I will try the geom shader approach then.
  8. Thanks! Actually, I wanted to do text rendering...

    Thanks! Actually, I wanted to do text rendering and particles, where I want to provide the center of a quad while its 4 points are calculated in the vertex shader(as the width of the quads is fixed)....
  9. Fetching vertex attributes at different rate

    Is there a way to fetch different vertex attributes at different rate. Like to use new vertex coordinates per every execution of the vertex shader but use the same color for 3 vertices. This would...
  10. Replies
    7
    Views
    628

    Thanks! It works now as expected. Now it also...

    Thanks! It works now as expected. Now it also gives an INVALID_ENUM error if I try to use the GL_POINT_SPRITE.
  11. Replies
    7
    Views
    628

    Thanks! "What is removed? Point sprites?...

    Thanks!
    "What is removed? Point sprites? Certainly not! Just glEnable(GL_POINT_SPRITE) is removed since it is always on in post GL 3.2 versions."

    I understand that in 3.2+ core it should be...
  12. Replies
    7
    Views
    628

    OK:) Thanks anyway!

    OK:) Thanks anyway!
  13. Replies
    7
    Views
    628

    gl_PointCoord problem

    gl_PointCoord is not working(always returns 0). If I use GL_POINT_SPRITE, it works, however that was removed in GL 3.2, ...and Im using 3.3 now.
    So it works, but I have to use something that was...
  14. Replies
    2
    Views
    488

    I mean ...skip indices logically ...not skip them...

    I mean ...skip indices logically ...not skip them physically in the memory. Thats what stride does.

    To give an example:
    I have 2 VBOs. In one there are the positions of the vertices, in the other...
  15. Replies
    2
    Views
    488

    Change VBO offset while drawing instances

    I want to do something like instanced rendering ...but sort of the opposite. With vertexAttribDivisor I can set something like "after every 5 instances it jumps to the next index in the VBO". But...
  16. Replies
    6
    Views
    934

    Thanks! The code works fine. Except that I had to...

    Thanks! The code works fine. Except that I had to change the initialization to this:


    const vec2 quad_vertices[4] = vec2[4]( vec2( -1.0, -1.0), vec2( 1.0, -1.0), vec2( -1.0, 1.0), vec2( 1.0,...
  17. Replies
    6
    Views
    934

    Draw with fragment shader without vertices

    In OpenGL 3.3, is it possible to use the fragment shader just to "paint" to the screen without the need for VBO-s and vertex shader? ....or do I need to create a simple vertex shader and at least a...
  18. Replies
    5
    Views
    869

    Thanks! I will try drawElements - strips -...

    Thanks! I will try drawElements - strips - p.restart index - draw rows back and forth, ....and see what happens. It cant be that bad.
  19. Replies
    5
    Views
    869

    Thanks! Thanks for the detailed answer Photon!...

    Thanks! Thanks for the detailed answer Photon!
    "you do iterative microbenching to look for performance falloffs (or code your own vertex shader cache in a GLSL compute shader/OpenCL/CUDA)"
    ....no,...
  20. Replies
    5
    Views
    869

    Post T&L cache questions

    Ive read everywhere that the post T&L cache is "FIFO" but Im not sure how to interpret this. Does it mean that for a list like 4,5,6,7,8 the GPU can only access the element "4", or does it mean that...
  21. Replies
    2
    Views
    942

    Thanks! Works fine. Thats what I wanted!

    Thanks! Works fine. Thats what I wanted!
  22. Replies
    2
    Views
    942

    Triangle Strip - Per Triangle color

    In the old OpenGL(glBegin, glEnd), when you draw a triangle strip, there was no way to set the color per-triangle. Only per-vertex. Is this the same with shaders? I would need to draw the heightmap...
  23. Replies
    5
    Views
    885

    Its not working. I give up.

    Its not working. I give up.
  24. Replies
    5
    Views
    885

    GLfloat projection_matrix[16] = { ...

    GLfloat projection_matrix[16] = { 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, ...
  25. Replies
    5
    Views
    885

    Sorry, I copy-pasted the text and it got messed...

    Sorry, I copy-pasted the text and it got messed up. Strange
Results 1 to 25 of 47
Page 1 of 2 1 2