Opengl ES 2.0 简单的纹理范例 iOS

范例工程：

LxOpenglES_Texture.zip

- (void)setupTexture {

// 2 x 2 Image, 3 bytes per pixel(R, G, B)
GLubyte pixels[4 *3] =
{
255, 0,
0, // Red
0, 255,
0, // Green
0, 0,
255, // Blue
255, 255,
0 // Yellow
};

// Use tightly packed data
glPixelStorei(GL_UNPACK_ALIGNMENT,1);

// Generate a texture object
glGenTextures(1, &_textureId);

// Bind the texture object
glBindTexture(GL_TEXTURE_2D,_textureId);

// Load the texture
glTexImage2D(GL_TEXTURE_2D,0,
GL_RGB,2,
2,0,
GL_RGB,GL_UNSIGNED_BYTE, pixels);

// Set the filtering mode
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,
GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,
GL_NEAREST);

}

- (void)render {

// 改变背景
glClearColor(0,104.0/255.0,
55.0/255.0,1.0);
glClear(GL_COLOR_BUFFER_BIT);

// 指定渲染的范围
glViewport(0,0,
self.frame.size.width,self.frame.size.height);

// 关联顶点数据
glVertexAttribPointer(0,3,
GL_FLOAT,GL_FALSE,
0,Vertices);

// 启用属性
glEnableVertexAttribArray(0);

//启用纹理
glVertexAttribPointer(1,2,
GL_FLOAT,GL_FALSE,
0,texCoords);
glEnableVertexAttribArray(1);

// 绘制图形
// glDrawArrays(GL_POINTS, 0, 3);
// glDrawArrays(GL_LINE_LOOP, 0, 3);
glDrawArrays(GL_TRIANGLES,0,
3);

//缓存中的内容输出至屏幕
[_contextpresentRenderbuffer:GL_RENDERBUFFER];
}