我可以像这样使用着色器、glVertexAttribPointer 和 glDrawArrays 显示纹理:

初始化

const GLfloat squareVertices[] = {
    -0.5f, -0.33f,
    0.5f, -0.33f,
    -0.5f,  0.33f,
    0.5f,  0.33f
};


const GLfloat squareTex[] = {
    0, 0,
    1, 0,
    0, 1,
    1, 1
};


glEnableVertexAttribArray(PositionTag);
glEnableVertexAttribArray(TexCoord0Tag);

glVertexAttribPointer(PositionTag, 2, GL_FLOAT, GL_FALSE, 0, squareVertices);
glVertexAttribPointer(TexCoord0Tag, 2, GL_FLOAT, GL_FALSE, 0, squareTex);

和平局

glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

但我很难转换为 VBO、着色器和 glDrawElements。这是我目前的代码，但没有任何显示:

标题

typedef struct MyVertex
{
    float x, y, z;        //Vertex
    float nx, ny, nz;     //Normal
    float s0, t0;         //Texcoord0
} MyVertex;

#define BUFFER_OFFSET(i) ((char *)NULL + (i))

初始化

glGenBuffers(1, &VertexVBOID);

glBindBuffer(GL_ARRAY_BUFFER, VertexVBOID);

MyVertex pvertices[4];
//Fill the pvertices array
pvertices[0].x = -0.5f;
pvertices[0].y = -0.33f;
pvertices[0].z = 0.0;
pvertices[0].nx = 0.0;
pvertices[0].ny = 0.0;
pvertices[0].nz = 1.0;
pvertices[0].s0 = 0.0;
pvertices[0].t0 = 0.0;

pvertices[1].x = 0.5f;
pvertices[1].y = -0.33f;
pvertices[1].z = 0.0;
pvertices[1].nx = 0.0;
pvertices[1].ny = 0.0;
pvertices[1].nz = 1.0;
pvertices[1].s0 = 1.0;
pvertices[1].t0 = 0.0;

pvertices[2].x = -0.5f;
pvertices[2].y = 0.33f;
pvertices[2].z = 0.0;
pvertices[2].nx = 0.0;
pvertices[2].ny = 0.0;
pvertices[2].nz = 1.0;
pvertices[2].s0 = 0.0;
pvertices[2].t0 = 1.0;

pvertices[3].x = 0.5f;
pvertices[3].y = 0.33f;
pvertices[3].z = 0.0;
pvertices[3].nx = 0.0;
pvertices[3].ny = 0.0;
pvertices[3].nz = 1.0;
pvertices[3].s0 = 1.0;
pvertices[3].t0 = 1.0;

glBufferData(GL_ARRAY_BUFFER, sizeof(MyVertex)*4, NULL, GL_STATIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(MyVertex)*4, pvertices);


glGenBuffers(1, &IndexVBOID);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, IndexVBOID);

int pindices[6];
pindices[0]=0;
pindices[1]=1;
pindices[2]=2;
pindices[3]=2;
pindices[4]=1;
pindices[5]=3;
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(int)*6, NULL, GL_STATIC_DRAW);
glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, sizeof(int)*6, pindices);

画画

glBindBuffer(GL_ARRAY_BUFFER, VertexVBOID);

glEnableVertexAttribArray(PositionTag);
glEnableVertexAttribArray(NormalTag);
glEnableVertexAttribArray(TexCoord0Tag);

glVertexAttribPointer(PositionTag, 3, GL_FLOAT, GL_FALSE, 32, BUFFER_OFFSET(0));
glVertexAttribPointer(NormalTag, 3, GL_FLOAT, GL_FALSE, 32, BUFFER_OFFSET(12));
glVertexAttribPointer(TexCoord0Tag, 2, GL_FLOAT, GL_FALSE, 32, BUFFER_OFFSET(24));

//    glDrawRangeElements(GL_TRIANGLES, x, y, z, GL_UNSIGNED_SHORT, BUFFER_OFFSET(0));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, IndexVBOID);
glDrawElements(GL_TRIANGLES, 3, GL_INT, 0);

最佳答案

根据 here , GL_INT 不是用于 glDrawElements 中索引的有效类型。尝试为您的索引使用 unsigned int(当然还有 glDrawElements 中的 GL_UNSIGNED_INT)。您仍然可以将 int 数据用作索引，但由于 glDrawElements 需要 GL_UNSIGNED_INT，因此使数组 unsigned 会更加一致整数。

编辑: 在查看规范后(根据您的标签，我采用了 ES 2.0 规范)，他们似乎进一步将其限制为无符号字节和无符号短整型。我不知道它是否在 iOS 中受到限制，但我们可以得出结论，数据至少必须是未签名的。另一方面，我还没有找到任何关于在错误的类型参数上引发的可能的 GL_INVALID_ENUM 错误的声明，但得到一个是合理的。

关于ios - GLES2.0 上的 VBO glDrawElements 和 glVertexAttribPointer 什么都不显示，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6921375/