Databases
StackOverflow2013
Postsdbo
POmaking an iphone cube class
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POmaking an iphone cube class
    primarykey
    data
    text
    <p>I followed <a href="http://www.raywenderlich.com/3664/opengl-es-2-0-for-iphone-tutorial" rel="nofollow">this tutorial</a> and I'm currently trying to create a class to draw cubes. The class populates the buffers in a function called setup and draws them in a function called draw.</p> <p>There are no errors however nothing is displayed on the screen.</p> <p>My question is basicly how do I go about making a class from which I can render cubes.</p> <p>Using Xcode 4.2, Opengl and Objective-C.</p> <p>[edit]</p> <pre><code>-(void)SetShader:(GLuint)InShader { glUseProgram(InShader); _positionSlot = glGetAttribLocation(InShader, "Position"); _colorSlot = glGetAttribLocation(InShader, "SourceColor"); glEnableVertexAttribArray(_positionSlot); glEnableVertexAttribArray(_colorSlot); _projectionUniform = glGetUniformLocation(InShader, "Projection"); _modelViewUniform = glGetUniformLocation(InShader, "Modelview"); _texCoordSlot = glGetAttribLocation(InShader, "TexCoordIn"); glEnableVertexAttribArray(_texCoordSlot); _textureUniform = glGetUniformLocation(InShader, "Texture"); } -(void)SetupVBO { GLuint vertexBuffer; glGenBuffers(1, &amp;vertexBuffer); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); glBufferData(GL_ARRAY_BUFFER, sizeof(CubeVertices), CubeVertices, GL_STATIC_DRAW); GLuint indexBuffer; glGenBuffers(1, &amp;indexBuffer); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(CubeIndices), CubeIndices, GL_STATIC_DRAW); } -(void)draw { glVertexAttribPointer(_positionSlot, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0); glVertexAttribPointer(_colorSlot, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 3)); glVertexAttribPointer(_texCoordSlot, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (GLvoid*) (sizeof(float) * 7)); glDrawElements(GL_TRIANGLES, sizeof(CubeIndices)/sizeof(CubeIndices[0]), GL_UNSIGNED_BYTE, 0); } -(void)render:(CADisplayLink*)displayLink { glClearColor(0, 0, 0.2, 1.0); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_DEPTH_TEST); CC3GLMatrix *projection = [CC3GLMatrix matrix]; float h = 4.0f * self.frame.size.height / self.frame.size.width; [projection populateFromFrustumLeft:-2 andRight:2 andBottom:-h/2 andTop:h/2 andNear:4 andFar:10]; glUniformMatrix4fv(_projectionUniform, 1, 0, projection.glMatrix); CC3GLMatrix *modelView = [CC3GLMatrix matrix]; [modelView populateFromTranslation:CC3VectorMake(0, 0, -7)]; [modelView translateBy:CC3VectorMake(0,5,0)]; glUniformMatrix4fv(_modelViewUniform, 1, 0, modelView.glMatrix); glViewport(0, 0, self.frame.size.width, self.frame.size.height); [m_cube draw]; [_context presentRenderbuffer:GL_RENDERBUFFER]; } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USgenpfault
    1. USDave
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COPlease post your code.
      singulars
      1. POmaking an iphone cube class
      1. USJosh Caswell
    2. COThe question is vague. Does following the tutorial without any changes work for you? If so, what changes did you make that aren't working? In general, when OpenGL draws nothing, it's because the OpenGL state machine is set up weirdly. If you post some code showing how you're setting things up, particularly your calls to `glViewport ()`, `glOrtho ()`, `gluPerspective ()`, and/or `glFrustum ()`, that would be helpful.
      singulars
      1. POmaking an iphone cube class
      1. USuser1118321
    3. COI've posted some of my relevent code
      singulars
      1. POmaking an iphone cube class
      1. USDave
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload