40 posts
Edited by BernFeth on Reason: Initial post
Hey guys.

So I've been reading OpenGL superbible and trying to learn it.

I managed to get things working until the vbo part, I've been messing around with it but can't get anything but a blank screen...

I have the following texture, position and indices arrays:
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 static r32 TextureData[] = { 0, 1, 1, 1, 1, 0, 0, 0, }; static r32 Size = 200.0f; static r32 HalfSize = Size/2; static r32 PositionData[] = { -HalfSize, -HalfSize, 0, HalfSize, -HalfSize, 0, HalfSize, HalfSize, 0, -HalfSize, HalfSize, 0, }; static GLubyte Indices[] = { 0, 1, 2, 0, 2, 3, }; static GLuint Vbos[3]; 

Then inside my InitScene function which is called once at the start of the game:

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 glFrontFace(GL_CCW); glCullFace(GL_BACK); glEnable(GL_TEXTURE_2D); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glGenBuffers(3, Vbos); glBindBuffer(GL_ARRAY_BUFFER, Vbos[0]); glBufferData(GL_ARRAY_BUFFER, 4*3*sizeof(GLfloat), PositionData, GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, Vbos[1]); glBufferData(GL_ARRAY_BUFFER, 4*2*sizeof(GLfloat), TextureData, GL_STATIC_DRAW); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, Vbos[2]); glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6*sizeof(GLubyte), Indices, GL_STATIC_DRAW); 

Finally, my DrawScene function:

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 glClearColor(0.2f, 0.2f, 0.2f, 1.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glTranslatef(WindowInfo.Width/2, WindowInfo.Height/2, -10); glBindTexture(GL_TEXTURE_2D, Textures[0]); glBindBuffer(GL_ARRAY_BUFFER, Vbos[0]); glVertexPointer(3, GL_FLOAT, 0, 0); glBindBuffer(GL_ARRAY_BUFFER, Vbos[1]); glTexCoordPointer(2, GL_FLOAT, 0, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, Vbos[2]); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, 0); glPopMatrix(); 

The textures are loaded once at the start as well, I know they are working properly since I had it working with vertex arrays just before I changed the code to use vertex buffers.

Am I making a silly mistake somewhere?

Thanks.
40 posts