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Vertex Array

Started by anakin_skywalker May 24, 2003 at 11:52 AM 5 replies 600+ views

Original Post

May 24, 2003 at 11:52 AM

Hi everyone. I am trying to create a Polygon from a vertex array. This is my code,,,,but seems that it doesn''t work. //This is my Ortho2D //Crete Coordinate system gluOrtho2D((GLdouble)-10,(GLdouble)10,(GLdouble)-10, (GLdouble)10); //This is my vertice Array. GLint vertices[] = {-5,0,0,5,5,5}; //First Clear Back glClear(GL_COLOR_BUFFER_BIT); //Enable Client State glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(2,GL_INT,0,vertices); //Draw glBegin(GL_POLYGON); //Set Yellow Color glColor3f(1.0, 1.0, 0.0); glEnd(); //Flush it glFlush(); //Swap buffer; SwapBuffers(globalDC); Thanks for your help..

Hippokrates

May 24, 2003 at 12:03 PM

You still have to call glDrawElements AFAIK.

anakin_skywalker

Author

anakin_skywalker

May 24, 2003 at 12:08 PM

Do I have to call it between the glBegin() and glEnd() or after a declared my glVertexPointe()?

Thanks for your help Hippokrates!!

Hippokrates

May 24, 2003 at 12:15 PM

AFAIK (and I do not know that much) you kan skip glBegin and glEnd and use just glDrawElements.
This is because by using glBegin/glEnd you specify what kind of primitive you want to render. But you must tell it glDrawElements anyway.
If you want to know what parameters it takes just go to google and type ''glDrawElements''.

anakin_skywalker

Author

anakin_skywalker

May 24, 2003 at 12:20 PM

Thanks Hippokrates..I got it!!!

ASW,

Hairybudda

May 24, 2003 at 4:52 PM

Ummm, dont quote me on this, but calling a vertex buffer in immediate mode (in between glBegin and glEnd) is illegal and will result in nothing?

Brother Bob

Mod

218

Brother Bob

May 24, 2003 at 5:17 PM

quote:
Original post by Hairybudda
Ummm, dont quote me on this, but calling a vertex buffer in immediate mode (in between glBegin and glEnd) is illegal and will result in nothing?

It will result in an error, but nothing on the screen at least

Seriously, it is indeed illegal to draw vertex arrays between a begin/end pair, unless you use glArrayElement to draw the arrays, then you have to use them between begin/end pair. glArrayElement is a mix between vertex array and immediate mode; you use vertex arrays, but call each vertex, one by one, manually.

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