OpenGLは早期使用をES
まず、環境を設定
1、Xcodeプロジェクトで作成された単一のコントローラと、
その後の使用に2、プロジェクト内のピクチャ;
3は、のViewControllerビュータイプはViewController.hファイルの内容は、「GLKView」に変更されます
#import <UIKit/UIKit.h>
#import <GLKit/GLKit.h>
@interface ViewController : GLKViewController
@end4、ファイルを変更ViewController.m
#import "ViewController.h"
#import <OpenGLES/ES3/gl.h>
#import <OpenGLES/ES3/glext.h>
@interface ViewController ()<GLKViewDelegate>
{
EAGLContext *context;
GLKBaseEffect *mEffect;//着色器或者光照
}
@end
第二に、画像符号化機能ブロックは、負荷のOpenGL ESを達成するために使用します
1、OpneGL ES構成
//1、设置opengl es 配置
- (void)setupConfig {
EAGLRenderingAPI api = kEAGLRenderingAPIOpenGLES3;
EAGLContext *ctx = [[EAGLContext alloc]initWithAPI:api];
if (!ctx) {
NSLog(@"EAGLContext init error!");
return;
}
[EAGLContext setCurrentContext:ctx];
GLKView *gView = (GLKView *)self.view;
gView.context = ctx;
gView.drawableColorFormat = GLKViewDrawableColorFormatRGBA8888;
gView.drawableDepthFormat = GLKViewDrawableDepthFormat24;
//开启深度测试
glEnable(GL_DEPTH_TEST);
//清除背景色
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
}
図2に示すように、頂点データロード
//2、加载顶点数据
- (void)uploadVertexArray {
//OpenGL ES
//顶点数据（x,y,z） 纹理（x,y）
//剧中半屏显示
GLfloat vertexData[] = {
0.5f,-0.5f,0.0f, 1.0f,0.0f,
0.5f,0.5f,0.0f, 1.0f,1.0f,
-0.5f,0.5f,0.0f, 0.0f,1.0f,
0.5f,-0.5f,0.0f, 1.0f,0.0f,
-0.5f,0.5f,0.0f, 0.0f,1.0f,
-0.5f,-0.5f,0.0f, 0.0f,0.0f,
};
/*
//---全屏显示
GLfloat vertexData[] = {
1.0f,-1.0f,0.0f, 1.0f,0.0f,
1.0f,1.0f,0.0f, 1.0f,1.0f,
-1.0f,1.0f,0.0f, 0.0f,1.0f,
1.0f,-1.0f,0.0f, 1.0f,0.0f,
-1.0f,1.0f,0.0f, 0.0f,1.0f,
-1.0f,-1.0f,0.0f, 0.0f,0.0f,
};
*/
//开启顶点缓存区
GLuint buffer;
//产生buffer标记
glGenBuffers(1, &buffer);
//绑定buffer
glBindBuffer(GL_ARRAY_BUFFER, buffer);
//加载数据
glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
//GLSL gl_position
glEnableVertexAttribArray(GLKVertexAttribPosition);
//读取顶点数据到顶点着色器中（GLKit）
/* 数据参数定义（纹理同理）：
1、读取顶点数据
2、读取数据个数（每个顶点数据几个数据）
3、顶点数据类型
4、是否规格化 no
5、每次读取的偏移量
6、指针起点
*/
glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*5, (GLfloat *)NULL);
//读取纹理数据
glEnableVertexAttribArray(GLKVertexAttribTexCoord0);
glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*5, (GLfloat *)NULL + 3);
}図3に示すように、ローディングテクスチャ
//3、加载纹理
- (void)uploadTexture {
NSString *filePath = [[NSBundle mainBundle]pathForResource:@"c" ofType:@"png"];
//纹理是反的
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:@1,GLKTextureLoaderOriginBottomLeft, nil];
GLKTextureInfo *textureInfo = [GLKTextureLoader textureWithContentsOfFile:filePath options:options error:NULL];
mEffect = [[GLKBaseEffect alloc]init];
mEffect.texture2d0.enabled = GL_TRUE;
mEffect.texture2d0.name = textureInfo.name;
}
GLKViewdelegateを達成するために4、
#pragma mark
#pragma mark - delegate
- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect {
glClearColor(0.3, 0.3, 0.6, 1.0f);
//清除surface内容，恢复至初始状态
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//启动着色器
[mEffect prepareToDraw];
/*
1、着色模式
2、开始位置
3、数目
*/
glDrawArrays(GL_TRIANGLES, 0, 6);
}三、ViewController.mはいくつかを達成します
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//1、设置opengl es 配置
[self setupConfig];
//2、加载顶点数据
[self uploadVertexArray];
//3、加载纹理
[self uploadTexture];
// Do any additional setup after loading the view, typically from a nib.
}
//1、设置opengl es 配置
- (void)setupConfig {
EAGLRenderingAPI api = kEAGLRenderingAPIOpenGLES3;
EAGLContext *ctx = [[EAGLContext alloc]initWithAPI:api];
if (!ctx) {
NSLog(@"EAGLContext init error!");
return;
}
[EAGLContext setCurrentContext:ctx];
GLKView *gView = (GLKView *)self.view;
gView.context = ctx;
gView.drawableColorFormat = GLKViewDrawableColorFormatRGBA8888;
gView.drawableDepthFormat = GLKViewDrawableDepthFormat24;
//开启深度测试
glEnable(GL_DEPTH_TEST);
//清除背景色
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
}
//2、加载顶点数据
- (void)uploadVertexArray {
//OpenGL ES
//顶点数据（x,y,z） 纹理（x,y）
//剧中半屏显示
GLfloat vertexData[] = {
0.5f,-0.5f,0.0f, 1.0f,0.0f,
0.5f,0.5f,0.0f, 1.0f,1.0f,
-0.5f,0.5f,0.0f, 0.0f,1.0f,
0.5f,-0.5f,0.0f, 1.0f,0.0f,
-0.5f,0.5f,0.0f, 0.0f,1.0f,
-0.5f,-0.5f,0.0f, 0.0f,0.0f,
};
/*
//---全屏显示
GLfloat vertexData[] = {
1.0f,-1.0f,0.0f, 1.0f,0.0f,
1.0f,1.0f,0.0f, 1.0f,1.0f,
-1.0f,1.0f,0.0f, 0.0f,1.0f,
1.0f,-1.0f,0.0f, 1.0f,0.0f,
-1.0f,1.0f,0.0f, 0.0f,1.0f,
-1.0f,-1.0f,0.0f, 0.0f,0.0f,
};
*/
//开启顶点缓存区
GLuint buffer;
//产生buffer标记
glGenBuffers(1, &buffer);
//绑定buffer
glBindBuffer(GL_ARRAY_BUFFER, buffer);
//加载数据
glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
//GLSL gl_position
glEnableVertexAttribArray(GLKVertexAttribPosition);
//读取顶点数据到顶点着色器中（GLKit）
/* 数据参数定义（纹理同理）：
1、读取顶点数据
2、读取数据个数（每个顶点数据几个数据）
3、顶点数据类型
4、是否规格化 no
5、每次读取的偏移量
6、指针起点
*/
glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*5, (GLfloat *)NULL);
//读取纹理数据
glEnableVertexAttribArray(GLKVertexAttribTexCoord0);
glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*5, (GLfloat *)NULL + 3);
}
//3、加载纹理
- (void)uploadTexture {
NSString *filePath = [[NSBundle mainBundle]pathForResource:@"c" ofType:@"png"];
//纹理是反的
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:@1,GLKTextureLoaderOriginBottomLeft, nil];
GLKTextureInfo *textureInfo = [GLKTextureLoader textureWithContentsOfFile:filePath options:options error:NULL];
mEffect = [[GLKBaseEffect alloc]init];
mEffect.texture2d0.enabled = GL_TRUE;
mEffect.texture2d0.name = textureInfo.name;
}
#pragma mark
#pragma mark - delegate
- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect {
glClearColor(0.3, 0.3, 0.6, 1.0f);
//清除surface内容，恢复至初始状态
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//启动着色器
[mEffect prepareToDraw];
/*
1、着色模式
2、开始位置
3、数目
*/
glDrawArrays(GL_TRIANGLES, 0, 6);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
第四に、結果を確認するために実行
