I think i got closer to the cause of the problem.
I wrote this rather silly vertex shader to test things out:



//in the shader
#version 420 core
layout(location = 5) in unsigned int inByte;...

So i am not alone, Thanks Nowhere-01.

I had a look through the spec and couldn't see any problems. Maybe this is a driver issue?

I have a debug text rendering setup which feeds char data to a vertex/geometry/fragment shader.

On my nvidia gtx460 feeding the char* data using this as the data description:
...

some extra information:
using : in ivec4 inJointIdx;
if I use inJointIdx for something trivial in the shader, and query it's location it gives me "4", but still won't let me manually set it using...

I am having a little trouble with my shader:

This doesn't work, I get a linker error



#version 420 core
layout(location = 0) in vec4 inVertex;
layout(location = 1) in vec4 inColour;...

http://www.opengl.org/discussion_boards/showthread.php/165360-Access-to-triangle-normals-rather-than-vertex?p=1169422#post1169422

this method, using dFdx/dFdy, also works and doesn't require...

what do you mean by OpenGL 3.0 Frameworks?

You should be able to edit and compile an OpenGL program in C using Microsoft's visual studio 2010 (even with the free express editions)

You can use...

You can create openGL contexts within winforms using visual studio :
http://www.codeproject.com/Articles/16051/Creating-an-OpenGL-view-on-a-Windows-Form
http://www.phasersonkill.com/?p=787
...

The rendering was incorrect, so I just added a few checks to see what was not as I expected.

That's pretty much what I am doing, it's for a bunch of tests with some shared UBOs and it's easier than setting the binding point each time, though that isn't a big undertaking in itself.

I...

I didn't try two arrays, but It also happens if I put a dummy array at the top of Transforms.

I have two Uniform Blocks in my vertex shader :


layout(std140, binding=1) uniform Transforms
{
uniform mat4 mvp;
uniform mat4 proj;
uniform mat4 mv;
uniform mat4 nrmn;
}trans;

I have a question/comment about this part of your code,

glReadBuffer(GL_COLOR_ATTACHMENT0);

Does this actually have any effect?


I think when you call glBlitFramebuffer only what is...

ah! so this is why my stuff stopped working when I updated my drivers. Thanks everyone :)

Thanks guys, I figured that is what I'd have to do, I kind of wondering if there was a was of discarding only certian fragment outputs and not all. I guess not.

I have 3 colour render buffers attached to my FBO and most of the time I will draw to all of them in the same shader using something like

outFragData[0] = vec4(1.0);
outFragData[1] = vec4(1.0);...

Here are some explanations/examples i have found.

http://prideout.net/blog/?p=48
http://codeflow.org/entries/2010/nov/07/opengl-4-tessellation/

A picture of the problem might help us a bit here ;)

Thank you so much for the quick response kRougue:

I was setting the sampler uniform to 0 at initialization, however I was not using samplerBuffer because it gave me a compiler error with...

I'm having trouble setting up a GL_TEXTURE_BUFFER

I have written a simple program to draw a cube at the origin and then have it's position offset by data stored in a 1D texture.

I initially...

maybe it's because there can be several outputs from a vertex shader to a geometry/fragment one and the underlying source needs to know which one is the vertex position?

I have come across a strange problem, and was wondering if anyone could shed some light on it.

I have been doing some GPU skinning in GL 3.3 and 2.1. my 3.3 version works without any problems, but...

I got it, i was not using GL_FLOAT in glTexSubImage1D but GL_UNSIGNED_BYTE by mistake. thanks for your time and help :)

Thank you for you answer DmitryM. I will try using Texture Buffers.

Does anyone know why when sending {1.0, 0.0, 0.0, 0.0} to a texture using glTexSubImage1D(GL_TEXTURE_1D, 0, 0, width, GL_RGBA,...

I'm using gl 3.3 core.

I have been using UBOs to access some float data in my shaders, indexing it with vertex attributes. but I'd like to try doing the same thing with a texture. And i have 2...