所谓顶点缓冲就是直接将顶点数据存储在gpu的一段缓冲区，不需要从cpu拷贝到gpu。提高了程序的运行效率。

操作步骤

1.创建顶点缓冲对象

GLuint vertexBufferID;

2.分配空间

glGenBuffers(1,? &vertexBufferID);

3.绑定当前顶点缓冲对象

glBindBuffer(GL_ARRAY_BUFFER, vertexBufferID);

4.初始化缓冲区数据

glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices,? GL_STATIC_DRAW);

5.启用顶点属性数组

glEnableVertexAttribArray(GLKVertexAttribPosition);

6.使用顶点数据进行渲染

glVertexAttribPointer(
? ? ? GLKVertexAttribPosition,
? ? ? 3,?
? ? ? GL_FLOAT,
? ? ? GL_FALSE,
? ? ? sizeof(SceneVertex),
? ? ? NULL);

7.绘制　　

glDrawArrays(GL_TRIANGLES, 0,3);

下面赋全部代码

@interface OpenGLESViewController : GLKViewController
{
? GLuint vertexBufferID;
}

@property (strong, nonatomic) GLKBaseEffect *baseEffect;

@end

?

#import "OpenGLESViewController.h"

@implementation OpenGLESViewController

@synthesize baseEffect;

/////////////////////////////////////////////////////////////////
// This data type is used to store information for each vertex
typedef struct {
? GLKVector3? positionCoords;
}
SceneVertex;

// Define vertex data for a triangle to use in example
static const SceneVertex vertices[] =
{
? {{-0.5f, -0.5f, 0.0}}, // lower left corner
? {{ 0.5f, -0.5f, 0.0}}, // lower right corner
? {{-0.5f,? 0.5f, 0.0}}? // upper left corner
};

/////////////////////////////////////////////////////////////////
// Called when the view controller's view is loaded
// Perform initialization before the view is asked to draw
- (void)viewDidLoad
{
? [super viewDidLoad];
?
? // Verify the type of view created automatically by the
? // Interface Builder storyboard
? GLKView *view = (GLKView *)self.view;
? NSAssert([view isKindOfClass:[GLKView class]],
? ? ? @"View controller's view is not a GLKView");
?
? // Create an OpenGL ES 2.0 context and provide it to the
? // view
? view.context = [[EAGLContext alloc]
? ? ? initWithAPI:kEAGLRenderingAPIOpenGLES2];
?
? // Make the new context current
? [EAGLContext setCurrentContext:view.context];
?
? // Create a base effect that provides standard OpenGL ES 2.0
? // Shading Language programs and set constants to be used for
? // all subsequent rendering
? self.baseEffect = [[GLKBaseEffect alloc] init];
? self.baseEffect.useConstantColor = GL_TRUE;
? self.baseEffect.constantColor = GLKVector4Make(
? ? ? 1.0f, // Red
? ? ? 1.0f, // Green
? ? ? 1.0f, // Blue
? ? ? 1.0f);// Alpha
?
? // Set the background color stored in the current context
? glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // background color
?
? // Generate, bind, and initialize contents of a buffer to be
? // stored in GPU memory
? glGenBuffers(1,? ? ? ? ? ? ? ? // STEP 1
? ? ? &vertexBufferID);
? glBindBuffer(GL_ARRAY_BUFFER,? // STEP 2
? ? ? vertexBufferID);
? glBufferData(? ? ? ? ? ? ? ? ? // STEP 3
? ? ? GL_ARRAY_BUFFER,? // Initialize buffer contents
? ? ? sizeof(vertices), // Number of bytes to copy
? ? ? vertices,? ? ? ? // Address of bytes to copy
? ? ? GL_STATIC_DRAW);? // Hint: cache in GPU memory
}