Your problem is actually that your zNear is 0.myGluPerspective(60,800.0f/600.0f,0,180);This is always illegal in any API for a perspective projection...

Why not use GL_POINTS with GL_POINT_SPRITE enabled? They're fast. Use gl_PointSize in the vertex shader to size the textured point (enable...

Problem solved: The z-axis directions are reversed. zFar = zNear and zNear = zFar.

I figured it out. The dudv map didn't have the right texture parameters. I found this out by looking at the 3 textures I was passing and the only one...

The simplest option for optimizing glBegin/glEnd code is to move your glBegin/glEnd calls outside of a loop, like so:// this is slow for (int i = 0;...

Yes. Quite a few actually. You can get much faster than what you've got here. A few prep questions: 1) Are the point.xyz positions you render...

Survey says: * macro #define GLUT_DISABLE_ATEXIT_HACK * Using freeglut or GLUT with MinGW * MinGW (OpenGL Wiki) you may have an option, but...

Just tried to follow up, but the errant behavior didn't appear! Next time it happens, I'll post it. Thanks. "Standard Editor"

Thank you to ALL for your input. I was the lucky recipient of advice that made me take a few shortcuts but without compromising the learning aspect...

Specifically regarding inversion, it depends. If you invert once on the CPU, then upload the already-inverted matrix to your shader as a uniform,...

I forgot to mention, I'm starting to think that the problem with the dudv texture moving has to do with not tiling the texture properly. I tried to...

In order to prevent similar confusion in the future, I've updated the: Pixel Transfer (OpenGL wiki) page to better describe the how...

Ok, thanks for the confirmation.

I've decided to give up on making something scaling smoothly. It simply doesn't make sense for what I'm currently doing (100% black lines) and for...

OpenGL 4.5 core profile specification, §8.4 (Pixel Rectangles), table 8.8 on p188. Non-REV formats have the first component in the highest bits...

I am posting some code because it might help. all I want to do is draw a bug and then erase it and then draw a second bug in the same place and then...

Thanks for the reply. That's a better theory than I had. In this test case, I'm not seeing any better perf with BGRA order than with RGBA order (in...

I believe, and this is without having done any formal testing to back it up, that ever since Microsoft shoved RGBA down the vendors throats in the...

the main point I guess is that this is going to be implementation-dependent. A GTX 1070 is a consumer-class card, so (and I'm really entering...

Follow-up with an example and we'll take a look. It's probably not related, but just out of curiosity, what do you have your Message Editor...

In step 2, the alpha should be unscaled. Otherwise, pixels which should be fully opaque will let some of the background bleed through:...

Here is one way of doing this: - Create a FrameBufferObject - Attach a texture with only 1 color component. This will be used to test for your...

Change gluPerspective(60, (GLfloat)w / (GLfloat)h, 1.0, 100.0); to gluOrtho2D(0.0, 1024.0, 0.0, 512.0);

It's the overlay plane. Hardware overlays are additional framebuffers which are composited during scan-out. Overlays avoid the need to redraw all...

#include "hello.h" int test_func() { return 0; } Notes: works well for me when previewing. Edit: works well also when posting.