VBO error

Graphics and GPU Programming Programming

Started by MrSimon May 04, 2012 10:55 AM

13 comments, last by MrSimon 11 years, 11 months ago

1,191

May 05, 2012 01:32 PM

Hi!

Besides, glDrawElements wants to know the format of the index buffer, so instead of GL_FLOAT you need either GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT.
Currently you use int in the sPolygons struct, so you should probably change that to unsigned int and then pick GL_UNSIGNED_INT in glDrawElements.

Hope that helps!

MrSimon

123

Author

May 05, 2012 02:00 PM

And now it works.

Thank you guys.

I should be quiet for a couple of days while I try to work out loading textures!

Thanks again guys. You make a difficult process (for me anyway - it's only been a week, so far) a whole lot easier.

MrSimon

123

Author

May 05, 2012 03:24 PM

OK. I have one more. After this, I promise, I'll leave you all alone.

VBO works, colours work, IBO works. Texture doesn't work?

Any ideas what's wrong?



struct float3



{



  float x, y, z;



};



struct float2



{



  float x, y;



};

struct sVertex

{



  float3 Position, colours, normals;



  float2 Texture;

};



struct sPolygons



{



  int x, y, z;



  //float Normal;



};

class cModel

{



  private:



   GLuint TextureID;



   GLuint VBOID;



   GLuint IBOID;



   int nVertices, nPolygons;



   unsigned char* TextureData;



  public:



   cModel(int nVertices, sVertex Vertices[], int nPolygons, sPolygons Polygons[], const char * TextureFile, int TextureWidth, int

TextureHeight);



   void Update();



   void Render();



};

cModel::cModel(int numVertices, sVertex Vertices[], int numPolygons, sPolygons Polygons[], const char * TextureFile, int TextureWidth, int

TextureHeight)

{

nVertices = numVertices;



glGenBuffers(1, &VBOID);



glGenBuffers(1, &IBOID);



glBindBuffer(GL_ARRAY_BUFFER, VBOID);



glBufferData(GL_ARRAY_BUFFER, numVertices*sizeof(sVertex), Vertices, GL_STATIC_DRAW);



glBindBuffer(GL_ARRAY_BUFFER, 0);



nPolygons = numPolygons;



glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, IBOID);



glBufferData(GL_ELEMENT_ARRAY_BUFFER, numPolygons*sizeof(sPolygons), Polygons, GL_STATIC_DRAW);



glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);



FILE * file = NULL;

file = fopen(TextureFile, "rb");

TextureData = new unsigned char [TextureWidth * TextureHeight * 3];



fread(TextureData, TextureWidth * TextureHeight * 3, 1, file);



fclose(file);



glGenTextures(1, &TextureID);



glBindTexture(GL_TEXTURE_2D, TextureID);



glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);



glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, TextureWidth, TextureHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureData);



};

void cModel::Render()

{

glBindBuffer(GL_ARRAY_BUFFER, VBOID);



glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, IBOID);



glBindTexture(GL_TEXTURE_2D, TextureID);



glEnableClientState(GL_VERTEX_ARRAY);



glEnableClientState(GL_COLOR_ARRAY);



glEnableClientState(GL_TEXTURE_COORD_ARRAY);



glVertexPointer(3, GL_FLOAT, 11*sizeof(float), (char*)NULL+0);



glColorPointer(3, GL_FLOAT, 11*sizeof(float), (char*)NULL+3*sizeof(float));



glTexCoordPointer(2, GL_FLOAT,11*sizeof(float), ((char*)NULL)+9*sizeof(float));



glDrawElements(GL_TRIANGLES, nPolygons*3, GL_UNSIGNED_INT, 0);



//glDrawArrays(GL_TRIANGLES, 0, nVertices);



glDisableClientState(GL_VERTEX_ARRAY);



glBindBuffer(GL_ARRAY_BUFFER, 0);



glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

};

sVertex Vertices[3] =

{

{{0.0f, 5.0f, -1.0f}, {0.0f, 1.0f, 0.0f}, {0.0f, 0.0f, 0.0f}, {0.5f, 1.0f}},



{{5.0f, -5.0f, -1.0f}, {1.0f, 0.0f, 0.0f}, {0.0f, 0.0f, 0.0f}, {1.0f, 0.0f}},



{{-5.0f, -5.0f, -1.0f}, {0.0f, 0.0f, 1.0f}, {0.0f, 0.0f, 0.0f}, {0.0f, 0.0f}}

};

sPolygons Array2[1] =

{

{0, 1, 2}

};

I really promise, this will be the last thing for a while (a little while anyway).

Tsus

1,191

May 05, 2012 09:50 PM

You probably have to set filters for the texture.

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);

glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

Oh, and texturing should be enabled of course.

glEnable(GL_TEXTURE_2D);

Best regards

MrSimon

123

Author

May 06, 2012 09:27 AM

And that did it.

As promised, I will bugger off for a while.

Thanks guys. You really are brilliant.

VBO error

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