🔒 Locked

Indexed Vertex array + texturing = fail?

Started by Captian Goatse Aug 24, 2003 at 1:06 PM 6 replies 450+ views

Original Post

Aug 24, 2003 at 1:06 PM

I have a texture that contains all the colors of the map. I haven't done much texturing before, but figured out that it shouldn't be that hard, and since I use indexed vertex arrays they should work the same. Because I want some memory efficiency, I have only as many sets of indices as I have levels of detail(clod) here is how I render a patch:

void Renderer::renderPatch(CLodPatch& patch, int offset) {
    glVertexPointer(3, GL_FLOAT, sizeof(Vector3f), pTer->vertices + offset);
    glTexCoordPointer(2, GL_FLOAT, 0, pTer->texture + offset);
    //glColorPointer(3, GL_FLOAT, sizeof(Vector3f), pTer->colors + offset);

    glDrawElements(GL_TRIANGLE_STRIP, pTer->numIndices[patch.curLod], GL_UNSIGNED_SHORT, pTer->indices[patch.curLod]);
    fillgaps(patch.error);
}

Now as I read up, it occurs that I can't do this since the texture will only draw the texture taking place at the indices and the offset is somehow perverted. No, I don't want that. And I will not make as many indice arrays as I have patches. Now is my only bet to transform the indice array or is there some extension that works the same way as vertex pointer? The way this works is pretty retarded. [edited by - Captian Goatse on August 24, 2003 2:07:00 PM]

Captian Goatse

Aug 28, 2003 at 9:42 AM

Am I now being clear here? I read that VBOs could be the sollution, anyone?

or am I not being coherent?

Raduprv

Aug 28, 2003 at 1:29 PM

You have to rearange all your vertices and texture coordinates that way so each element will have the correct x,y,z,u,v.

Or isn''t that the problem? Try to reexplain it.

Height Map Editor | Eternal Lands | Fast User Directory

BGCJR

Aug 28, 2003 at 10:16 PM

you use a offset for vertex and the texture coords?

Captian Goatse

Aug 29, 2003 at 5:48 AM

Yes, I use offset for vertices coords because the texture patch I want to draw is just a part of the texture I want to draw.

A quick question here:
Can I use glVertexPointer3f(....vertices + offset) with normals?
glnormalPointer3f(........normals+offset? or do I have to figure out something else?

MARS_999

Aug 30, 2003 at 9:34 PM

Not sure what you''re trying to do but you need to specify glNormalPointer() with glVertexPoniter() and glTexCoordPointer() before you use glDrawElements. And you either need to have all that data stored somehow? e.g. structures or arrays. And if you are using VBO''s you need to use a BUFFER_OFFSET() like macro if you want with the gl*Pointer functions and glDrawElements function. The BUFFER_OFFSET() is actual memory size. e.g. float = 4bytes * however many data types you have.
e.g. 3 floats would = sizeof(float) * 3

Not sure if that is helping??

jamessharpe

Aug 31, 2003 at 10:03 AM

Are you enabling GL_TEXTURE_COORD_ARRAY, GL_TEXTURE_2D and GL_VERTEX_ARRAY, before making these calls?

EDIT: this code should work without glNormalPointer set if you haven't enabled the normal array.

[edited by - jamessharpe on August 31, 2003 11:10:40 AM]

Captian Goatse

Sep 1, 2003 at 8:30 AM

I''m not using VBOs, yet.

What I want to do is to adjust the offset of the texture array to make the coloring, BUT with single list of indices. This way I can aboid the use of color pointer and use my favourite paint program to make the terrain look "cool". However, when I try to do this, the I just get one part of the texture looped over and over and over again, looking like the offset has failed.

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.