Sending Textures to Fragment Shaders - solved

[Ciardhubh]

Yea ... that 4 was probably ok *cough*

Do you have a Vertex shader (not sure if one is mandatory if you have a fragment program)? Do you set gl_TexCoord[0] = gl_MultiTexCoord0; in it to pass it to the fragment shader?

Do you still get exceptions with the debug build? Can't really see something right now - guess it's late - without running it myself.

[Super_Llama]

The texture coordinates are being accessed perfectly, I can pass UVW as RGB and it renders as expected. I'm not using a vertex shader since the default one (or lack thereof) is sufficient for what I"m trying to do. The only problem is that it's not sending the buffer. I might try using a FloatBuffer instead. And yes, the debug build is still pumping out exceptions regarding MatrixMode, which is weird because there's nothing wrong with the matrices.

[Ciardhubh]

Well, an exception means something's wrong. I'd say, find the call responsible and check the OpenGL spec (http://www.opengl.org/sdk/docs/man/) for cases in which this error is thrown.

[Super_Llama]

I'm fixing them one by one-- seems like all of them are in the matrix code I copy-pasted from a sample, rofl. I'll post back if I find the culprit, or if the error river runs dry...

EDIT: I found it!

Exception in thread "AWT-EventQueue-2" org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
	at org.lwjgl.opengl.Util.checkGLError(Util.java:56)
	at org.lwjgl.opengl.ARBShaderObjects.glUniform1iARB(ARBShaderObjects.java:231)

Unfortunately I have no idea how to fix it, since I'm doing exactly what Matthias said on page 1... it seems to think that a Uniform1i can't be used to set a sampler2D.

EDIT 2:

GL_INVALID_OPERATION is generated if a   sampler is loaded using a command other than glUniform1i and glUniform1iv.

I wonder if glUniform1iARB is different than glUniform1i...? I guess I'll try iv...

[Ciardhubh]

Invalid operation is also thrown if:
GL_INVALID_OPERATION is generated if glUniform is executed between the execution of glBegin and the corresponding execution of glEnd. (called between begin and end?)
GL_INVALID_OPERATION is generated if there is no current program object. (no call to glUseProgram?)
GL_INVALID_OPERATION is generated if location is an invalid uniform location for the current program object and location is not equal to -1. (did glGetUniformLocation run ok?)

[Super_Llama]

GL_INVALID_OPERATION is generated if there is no current program object. (no call to glUseProgram?)

That's what it was. I reordered the calls and the exception went away, but the quad still renders without a texture >_<

EDIT:
The river of errors has run dry, and there's still no solution... linking to debug makes absolutely no difference now, and the quad still shows up black. I tried using a FloatBuffer instead of a ByteBuffer and it didn't help.

EDIT 2: Still waiting for help, changed title to make sure people notice

[Rene]

The default OpenGL minification filter uses mipmaps. You can easily generate mipmaps with

EXTFramebufferObject.glGenerateMipmapEXT(GL11.GL_TEXTURE_2D);

Or change the minification filter, depending on your needs.

[Super_Llama]

I had a hunch that it had something to do with mipmaps, but I didn't know where to start. Thanks for the advice, I really hope this works!

EDIT: YES!!! IT WORKED! Thanks a lot, I was just about ready to give up. I'd +rep if the forum had such a feature