Sign in to follow this  

strange crash

This topic is 4827 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I am working on a small terrain engine, using heightmap. First i want to render a flat terrain. But i am getting a strange(to mee) access violation. After some debugging i have found out it happens after i render my scene. Actually the second time i call DrawIndexedPrimitive() (2.frame). CAnt figure out what i am doing wrong. The buffers are being filled correctly, i wrote the data to file and looked at it.
#include "terrain.h"

#include <stdio.h>   // sprintf
#include <fstream>   // filio
using namespace std;

bool Terrain::generate(){
  Vertex *p_vertex;
	int *p_index;
	int x, y;
  w = h = 3;  // num of squares not vertices
	float squaresize = 4.0f;

	// dreate the buffers
  if(D3D_OK != g_pd3dDevice->CreateIndexBuffer(w*h*6, 0, D3DFMT_INDEX32, D3DPOOL_DEFAULT, &ib, NULL)) return false;
  if(D3D_OK != g_pd3dDevice->CreateVertexBuffer((w+1)*(h+1)*sizeof(Vertex), 0, VERTEXFORMAT, D3DPOOL_DEFAULT, &vb, NULL)) return false;

  //fill vb
  vb->Lock(0,0,(void **)&p_vertex, 0);
  for (y = 0; y < w+1; y++) {
		for (x = 0; x < h+1; x++) {
			p_vertex[x+y*(w+1)].position.x = -w/2+x*squaresize;
			p_vertex[x+y*(w+1)].position.y = 2.0f;
			p_vertex[x+y*(w+1)].position.z = -h/2+y*squaresize;
		}
  }
  vb->Unlock();

	//fill ib
	int i = 0;
  ib->Lock(0,0,(void **)&p_index, 0);
  for (y = 0; y < w; y++) {
		for (x = 0; x < h; x++) {
			p_index[i++] = x+y*(w+1);
			p_index[i++] = x+y*(w+1)+1;
			p_index[i++] = x+y*(w+1)+(w+1);

			p_index[i++] = x+y*(w+1)+1;
			p_index[i++] = x+y*(w+1)+1+(w+1);
			p_index[i++] = x+y*(w+1)+(w+1);
		}
  }
  ib->Unlock();

  return true;
}

// draw
bool Terrain::draw(){

  g_pd3dDevice->SetStreamSource(0, vb, 0, sizeof(VERTEXFORMAT));
	g_pd3dDevice->SetIndices(ib);
	g_pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, (w+1)*(h+1), 0, w*h*2);
  return true;
}


Share this post


Link to post
Share on other sites

This topic is 4827 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this