cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   Lars
   Member

   Hi there, I have a project running with cocos2d 0.8.1 and I wanted to upgrade to 0.99. I replaced all the renamed classes and the program runs, but crashes as soon as I draw something in opengl. What has changed how cocos2d sets up the OpenGL context? Since I'm pretty new to OpenGL, I really don't know how to debug that thing, ... So I need a hint ;)

   Here is an example of how I draw a plane (Extended CCNode with a texture):

   http://dev.nulldesign.de/WaterTexture.h
   http://dev.nulldesign.de/WaterTexture.m

   As soon as I "draw" get's called, the program crashes (Was working fine in 0.8.1)

   Many thanks,
   Lars

   Posted 1 year ago #
2. 

   Lars
   Member

   -(void) draw
   {
   glBindTexture(GL_TEXTURE_2D, texture_.name);

   glDisableClientState(GL_VERTEX_ARRAY);
   glDisableClientState(GL_NORMAL_ARRAY);
   glDisableClientState(GL_TEXTURE_COORD_ARRAY);

   glVertexPointer(3, GL_FLOAT, 0, renderV);
   glNormalPointer(GL_FLOAT, 0, normals);
   glTexCoordPointer(2, GL_FLOAT, 0, renderT);

   ...
   glDrawArrays(GL_TRIANGLE_STRIP, 0, (gridStepsX + 1) * 2);
   ...

   glEnableClientState(GL_VERTEX_ARRAY);
   glEnableClientState(GL_NORMAL_ARRAY);
   glEnableClientState(GL_TEXTURE_COORD_ARRAY);
   }

   I changed the drawing according to the changed made in 0.99 (http://www.cocos2d-iphone.org/wiki/doku.php/release_notes:0_99_0), now it doesn't crash anymore, but the screen is just black.... I'm digging deeper ;)

   Posted 1 year ago #
3. 

   patrickC
   Member

   Well since you're using both a texture coordinates array and a vertex array why are you disabling those two states?
   You should just disable the GL_NORMAL_ARRAY state, do your drawing, and re-enable it.

   Posted 1 year ago #
4. 

   Lars
   Member

   This is what I just did, plus disabling the GL_COLOR_ARRAY did the trick, thanks:

   glDisableClientState(GL_COLOR_ARRAY);

   glBindTexture(GL_TEXTURE_2D, texture_.name);

   glVertexPointer(3, GL_FLOAT, 0, renderV);
   glNormalPointer(GL_FLOAT, 0, normals);
   glTexCoordPointer(2, GL_FLOAT, 0, renderT);
   ...
   glDrawArrays(GL_TRIANGLE_STRIP, 0, ...);
   ...
   glEnableClientState(GL_COLOR_ARRAY);

   It's a lot easier in 0.99, the default opengl state makes more sense than before ;).

   Posted 1 year ago #

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