Game Development Reference
In-Depth Information
[EAGLContext setCurrentContext:view.context];
glGenBuffers(1, &_vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(SquareVertices),
SquareVertices,
GL_STATIC_DRAW);
glGenBuffers(1, &_indexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
sizeof(SquareTriangles),
SquareTriangles, GL_STATIC_DRAW);
_squareEffect = [[GLKBaseEffect alloc] init];
float aspectRatio = self.view.bounds.size.width/
self.view.bounds.size.height;
float fieldOfViewDegrees = 60.0;
GLKMatrix4 projectionMatrix =
GLKMatrix4MakePerspective(GLKMathDegreesToRadians(fieldOfViewDegrees),aspectRatio,
0.1, 10.0);
_squareEffect.transform.projectionMatrix = projectionMatrix;
GLKMatrix4 modelViewMatrix =
GLKMatrix4MakeTranslation(0.0f, 0.0f, -6.0f);
_squareEffect.transform.modelviewMatrix = modelViewMatrix;
_squareEffect.useConstantColor = YES;
_squareEffect.constantColor = GLKVector4Make(1.0, 0.0, 0.0,
1.0);
}
- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect {
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
[_squareEffect prepareToDraw];
glEnableVertexAttribArray(GLKVertexAttribPosition);
glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT,
GL_FALSE, 0, 0);
int numberOfVertices = sizeof(SquareTriangles)/
sizeof(SquareTriangles[0]);
