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  Question about glDrawElements  (Read 1336 times)
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Offline vinodpatel

Senior Newbie





« Posted 2007-06-19 04:42:37 »


Hi All,

      Any one know, when program can crash by running glDrawElements method. I mean, is there any flag or status that crash the animation program?.

Thanks In Advance,
Vinod Patel
Offline turquoise3232

Junior Devvie




Java (games) rock!


« Reply #1 - Posted 2007-06-19 09:42:19 »

Hi the answer to your question must be in the sticky post just above yours...
http://www.java-gaming.org/forums/index.php?topic=11947.0
Offline vinodpatel

Senior Newbie





« Reply #2 - Posted 2007-06-19 11:58:30 »


Hi,
        I have read and done all stuff suggested in given link. Although it does not work.
        Any other solution for that...?

Regards
Patel Vinod
       
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline lhkbob

JGO Knight


Medals: 32



« Reply #3 - Posted 2007-06-19 14:04:30 »

You flipped your name and before anyone call help you or tell you how to fix something, they need to know a little more context (ie post a small sample of code where the problem lies).

Offline vinodpatel

Senior Newbie





« Reply #4 - Posted 2007-06-20 04:43:29 »

Hello,

         This is a code where i getting problem
*********
   if (m_Texturing && m_EnvMapOn && normals != null) {
         CQ3DMatrix worldview = new CQ3DMatrix();
         worldview.mul(m_ViewMatrix, m_WorldMatrix);
         for (int i = 0, face = 0; i < nbIndex; i += 3, face++) {
            CQ3DVector normal = new CQ3DVector();

            normal.assign(normals[face]);
            normal.transformNoTrans(worldview);

            if (m_NormalizeNormals) {
               normal.normalize(); // Maybe a scale Huh
            }

            float UV[] = new float[2];

            UV[0] = normal.m_Vector.x * 0.5f + 0.5f;
            UV[1] = normal.m_Vector.y * 0.5f + 0.5f;

            float norm[] = new float[3];
            norm[0] = normals[face].x;
            norm[1] = normals[face].y;
            norm[2] = normals[face].z;

            m_gl.glBegin(GL.GL_TRIANGLES);
            m_gl.glNormal3fv(norm, 0);
            m_gl.glTexCoord3fv(UV, 0);
            norm[0] = vertices[faces[face + faceindex].a].pos.x;
            norm[1] = 0;
            norm[2] = 0;
            m_gl.glVertex3fv(norm, 0);
            norm[0] = vertices[faces[face + faceindex].b].pos.x;
            m_gl.glVertex3fv(norm, 0);
            norm[0] = vertices[faces[face + faceindex].c].pos.x;
            m_gl.glVertex3fv(norm, 0);
            m_gl.glEnd();
         }

      }

      SQ3DVERTEX[] Vertices = prepareVertices(vertices, nbVertices);

      m_gl.glEnableClientState(GL.GL_VERTEX_ARRAY);
      
      FloatBuffer buffer = BufferUtil.newFloatBuffer(Vertices.length * 2);
      if (m_Texturing && !m_GenerateTexCoords) {
         m_gl.glEnableClientState(GL.GL_TEXTURE_COORD_ARRAY);
         for (int Icount = 0; Icount < Vertices.length; Icount++) {
            buffer.put(Vertices[Icount].u);
            buffer.put(Vertices[Icount].v);
         }
         buffer.rewind();
         m_gl.glTexCoordPointer(2, GL.GL_FLOAT, 0, buffer);
      } else {
         m_gl.glDisableClientState(GL.GL_TEXTURE_COORD_ARRAY);
      }

      buffer = BufferUtil.newFloatBuffer(Vertices.length * 3);
      for (int Icount = 0; Icount < Vertices.length; Icount++) {
         buffer.put(Vertices[Icount].pos.x);
         buffer.put(Vertices[Icount].pos.y);
         buffer.put(Vertices[Icount].pos.z);
      }
      buffer.rewind();
      m_gl.glVertexPointer(3, GL.GL_FLOAT, 0, buffer);

      if (normals == null) {
         m_gl.glEnableClientState(GL.GL_NORMAL_ARRAY);
         buffer = BufferUtil.newFloatBuffer(Vertices.length*3);
         for (int Icount = 0; Icount < Vertices.length; Icount++) {
            buffer.put(Vertices[Icount].normal.x);
            buffer.put(Vertices[Icount].normal.y);
            buffer.put(Vertices[Icount].normal.z);
         }
         buffer.rewind();
         m_gl.glNormalPointer(GL.GL_FLOAT, 0, buffer);

         ShortBuffer shBuf = BufferUtil.newShortBuffer(faces.length * 3);
         for (int Icount = faceindex; Icount < faces.length; Icount++) {
            shBuf.put((short) faces[Icount].a);
            shBuf.put((short) faces[Icount].b);
            shBuf.put((short) faces[Icount].c);
         }
         shBuf.rewind();
         
         m_gl.glDrawElements(GL.GL_TRIANGLES, (int) nbIndex,GL.GL_UNSIGNED_SHORT, shBuf);
         //m_gl.glDrawRangeElements(GL.GL_TRIANGLES,0,(int)nbIndex-1,(int)nbIndex,GL.GL_UNSIGNED_SHORT, shBuf);
         m_gl.glDisableClientState(GL.GL_NORMAL_ARRAY);
      } else {
         m_gl.glDisableClientState(GL.GL_NORMAL_ARRAY);
         m_gl.glBegin(GL.GL_TRIANGLES);
         for (int i = 0, face = 0; i < nbIndex; i += 3) {
            buffer.put(0, normals[face].x);
            buffer.put(1, normals[face].y);
            buffer.put(2, normals[face].z);
            m_gl.glNormal3fv(buffer);
            m_gl.glArrayElement(faces[face + faceindex].a);
            m_gl.glArrayElement(faces[face + faceindex].b);
            m_gl.glArrayElement(faces[face + faceindex].c);
            face++;
         }
         m_gl.glEnd();
         m_gl.glEnableClientState(GL.GL_NORMAL_ARRAY);
      }

      m_gl.glDisableClientState(GL.GL_VERTEX_ARRAY);

      if (m_Texturing && !m_GenerateTexCoords) {
         m_gl.glDisableClientState(GL.GL_TEXTURE_COORD_ARRAY);
      }

Regards.
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