why this triggers glGetError()?

Graphics and GPU Programming Programming

Started by EvilNando May 30, 2011 06:14 PM

5 comments, last by V-man 12 years, 11 months ago

Author

May 30, 2011 06:14 PM





    // Vertex data

    if ( vertex_buffer == NULL )

    {

        // Create vertex buffer

        glGenBuffers(1, &vertex_buffer);

        glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); 



        // Copy data

        glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_data),  vertex_data, GL_DYNAMIC_DRAW);		



        GLenum _error_check_value = glGetError();

        if ( _error_check_value != GL_NO_ERROR )

        {

            ShowMessage("Quad::Load() Error! %s", gluErrorString(_error_check_value));

        }

    }

just by doing this I trigger an invalid enumerator error , why is this?

zacaj

667

May 30, 2011 06:21 PM

Which function is producing the error, and on which opengl version?

My Site

@zacaj_

EvilNando

Author

May 30, 2011 06:27 PM

how can I check that?

ogl 40

EvilNando

Author

May 30, 2011 06:38 PM

nevermind this error is getting triggered way before this piece of code

but it would be useful to know how to pinpoint the function that is causing this log entry, currently Im just placing glgeterror() all over the place and I think this error is getting triggered in my SDL initialization

Aks9

1,499

May 30, 2011 08:02 PM

but it would be useful to know how to pinpoint the function that is causing this log entry, currently Im just placing glgeterror() all over the place and I think this error is getting triggered in my SDL initialization

There is a helpful extension - debug_output, but you'll need to upgrade your drivers to GL 4.1.

Define debug callback function, activate synchronous output and add a breakpoint inside callback function. Whenever an error occurs you'll have a function caused it in the call-stack.

EvilNando

Author

May 30, 2011 09:36 PM

[quote name='EvilNando' timestamp='1306780725' post='4817609']but it would be useful to know how to pinpoint the function that is causing this log entry, currently Im just placing glgeterror() all over the place and I think this error is getting triggered in my SDL initialization

V-man

813

May 31, 2011 02:22 PM

http://www.opengl.org/wiki/Extension_Loading_Library

You might still get GL_INVALID_ENUM (depending on the version of GLEW you use), but at least GLEW ignores glGetString(GL_EXTENSIONS) and gets all function pointers.[/quote]

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);

why this triggers glGetError()?

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why this triggers glGetError()?

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