opengl es3.0绘制一个球形代码

以下是使用OpenGL ES 3.0绘制球形的示例代码：

#include <GLES3/gl3.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <vector>

// 定义球形的顶点和索引
const int SPHERE_LONG = 36;
const int SPHERE_LAT = 18;

std::vector<GLfloat> sphereVertices;
std::vector<GLuint> sphereIndices;

void generateSphere()
{
    sphereVertices.clear();
    sphereIndices.clear();

    for (int j = 0; j <= SPHERE_LAT; j++)
    {
        float lat0 = glm::pi<float>() * (-0.5f + (float)(j - 1) / SPHERE_LAT);
        float z0 = sin(lat0);
        float zr0 = cos(lat0);

        float lat1 = glm::pi<float>() * (-0.5f + (float)j / SPHERE_LAT);
        float z1 = sin(lat1);
        float zr1 = cos(lat1);

        for (int i = 0; i <= SPHERE_LONG; i++)
        {
            float lng = 2 * glm::pi<float>() * (float)(i - 1) / SPHERE_LONG;
            float x = cos(lng);
            float y = sin(lng);

            sphereVertices.push_back(x * zr0);
            sphereVertices.push_back(y * zr0);
            sphereVertices.push_back(z0);

            sphereVertices.push_back(x * zr1);
            sphereVertices.push_back(y * zr1);
            sphereVertices.push_back(z1);
        }
    }

    for (int i = 0; i < SPHERE_LAT; i++)
    {
        for (int j = 0; j < SPHERE_LONG; j++)
        {
            int a = (SPHERE_LONG + 1) * i + j;
            int b = (SPHERE_LONG + 1) * (i + 1) + j;
            int c = (SPHERE_LONG + 1) * (i + 1) + (j + 1);
            int d = (SPHERE_LONG + 1) * i + (j + 1);

            sphereIndices.push_back(a);
            sphereIndices.push_back(b);
            sphereIndices.push_back(c);

            sphereIndices.push_back(a);
            sphereIndices.push_back(c);
            sphereIndices.push_back(d);
        }
    }
}

// 渲染球形
void renderSphere(GLuint program)
{
    GLuint positionLocation = glGetAttribLocation(program, "a_Position");

    glEnableVertexAttribArray(positionLocation);
    glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), &sphereVertices[0]);

    glDrawElements(GL_TRIANGLES, sphereIndices.size(), GL_UNSIGNED_INT, &sphereIndices[0]);

    glDisableVertexAttribArray(positionLocation);
}

使用时需要先调用`generateSphere()`函数生成球形的顶点和索引，然后在渲染时调用`renderSphere()`函数即可。需要注意的是，需要在OpenGL ES 3.0环境下运行。