I changed my example a bit by adding an vao object.
But it does not work yet
Still a black screen like the original cpp example on my ati, but not a cube as promised.
Here is my new attempt: http://www.noeska.net/downloads/Ogl3Cube2.zip
| DGL https://delphigl.com/forum/ |
|
| OpenGL 3.x cube problem https://delphigl.com/forum/viewtopic.php?f=19&t=8881 |
Seite 1 von 1 |
| Autor: | noeska [ So Dez 20, 2009 20:52 ] |
| Betreff des Beitrags: | OpenGL 3.x cube problem |
Next in my opengl3.x adventures is trying to display a cube, but i must be doing something wrong. The original is available from: http://nopper.tv/opengl_3_2.html (example03) This is my attempt: http://www.noeska.net/downloads/Ogl3Cube1.zip . Who can help me to find out what i do wrong. Also i found the original not to be logic as in the render part i do not see references as to what is rendered? |
|
| Autor: | noeska [ Mo Dez 21, 2009 20:08 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
For now i suspect the following: g_vertexLocation := glslsimpleprog.GetAttribLocation('vertex'); g_normalLocation := glslsimpleprog.GetAttribLocation('normal'); both give -1 as result. But why? The attrib is availeable in the vertex shader and the vertex shader compiles succesfully... Only the fragment shader gives an warning... Now i could set an attrib location, but this should work also (even in opengl 2.x ?) |
|
| Autor: | Lord Horazont [ Mo Dez 21, 2009 20:11 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
Did you bind the Shader program properly? greetings |
|
| Autor: | noeska [ Mo Dez 21, 2009 20:38 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
I think i do, but i am not sure... |
|
| Autor: | noeska [ Di Dez 22, 2009 19:49 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
with getting some wrong results from glGetAttribLocation i was hinted to look in the dglopengl header on the pgd forum and indeed there is a bug as char is specified there as string instead of PGLChar. OpenGL 3.2 - Headertranslation Version 3.2.2 Date : 16.12.2009 row 6577 should be: TglGetAttribLocation = function(programObj: GLhandle; char: PGLChar): glint; {$IFDEF DGL_WIN}stdcall; {$ELSE}cdecl; {$ENDIF} Not that my cube shows yet, i need to add some more code to the cube example ... What do you mean by bind? glLinkProgramARB(FProgramObject); or glUseProgram(FProgramObject); or both? |
|
| Autor: | Lord Horazont [ Mi Dez 23, 2009 22:08 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
I meant the glUseProgram call. greetings |
|
| Autor: | noeska [ Do Dez 24, 2009 19:37 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
I changed my example a bit by adding an vao object. But it does not work yet Still a black screen like the original cpp example on my ati, but not a cube as promised. Here is my new attempt: http://www.noeska.net/downloads/Ogl3Cube2.zip |
|
| Autor: | noeska [ Fr Dez 25, 2009 19:24 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
Found some bugs in passing the arrays trough the calculations. Fixed that. But still no cube Latest version: http://www.noeska.net/downloads/Ogl3Cube3.zip Who is willing to test the code on nvidia? |
|
| Autor: | noeska [ Fr Dez 25, 2009 23:34 ] |
| Betreff des Beitrags: | Re: OpenGL 3.x cube problem |
Found the real problem  In the resizewindow part i already 'publish' the projectionlocation matrix, but the location is not known yet and default being 0. But when requested its location becomes 1 resulting that it is overwritten by the modelview matrix that gets location 0. So as a workaround i calculate the matrix as before but only 'publish' it in the init part. And next the cube showed up Final source: http://www.noeska.net/downloads/Ogl3Cube4.zip [edit]fixed typo in url[/edit] |
|
| Seite 1 von 1 | Alle Zeiten sind UTC + 1 Stunde |
| Powered by phpBB® Forum Software © phpBB Group https://www.phpbb.com/ |
|