glTexImage2D does nothing

Adrian Bibby Walther · 2012-05-30T15:18:56

I'm using SDL_image to load textures for my game, I then try to load them into OpenGL using glTexImage2D. Using the following code I've found out, that the problem lies in glTexImage2D, as it simply does nothing. (at least the width and height of the texture remains unchanged) int ID,Width,Height; glGetIntegerv(GL_TEXTURE_BINDING_2D,&ID); glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_WIDTH,&Width); glGetTexLevelParameteriv(GL_TEXTURE_2D,0,GL_TEXTURE_HEIGHT,&Height); std::cout << ID << ": " << Width << "*" << Height << std::endl; The weird thing is that I have another program, and it uses the exact same code, but it works in that program. glGetError returns 0 ie no error. The code loading the texture and all is compiled and linked into a static library, and I have a test project that links with it, so I can see, if the code I've written works or not.

Graphics and GPU Programming Programming OpenGL

Started by Adrian Bibby Walther May 24, 2012 02:14 PM

11 comments, last by Adrian Bibby Walther 11 years, 10 months ago

Adrian Bibby Walther

112

Author

May 28, 2012 09:03 PM

Turns out I only fixed the code for "power of 2"-textures.
My graphics card does support GL_ARB_texture_non_power_of_two, and in my other project it worked absolutely fine.

V-man

813

May 30, 2012 01:30 PM

Turns out I only fixed the code for "power of 2"-textures.
My graphics card does support GL_ARB_texture_non_power_of_two, and in my other project it worked absolutely fine.

Are you sure glGetError doesn't detect any problems?
Also, what is your GL version?

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

Adrian Bibby Walther

112

Author

May 30, 2012 03:18 PM

Are you sure glGetError doesn't detect any problems?
Also, what is your GL version?

This time, errors did appear.
I traced (due to the lack of a better word) it back to the SDL OpenGL configuration: I apparently didn't enable SDL_GL_MULTISAMPLEBUFFERS.

~Solved

glTexImage2D does nothing

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glTexImage2D does nothing

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