我是Open G1的新手，我需要创建一个由屏幕上的形状组成的应用程序。这些形状由相同的立方体组成。我不知道如何在着色器中单独为每个立方体着色，因为坐标只是通过缓冲区作为单个属性传入？
glGenVertexArraysOES(1, &_vertexArray);
glBindVertexArrayOES(_vertexArray);
glGenBuffers(1, &_vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, 1527 * sizeof(GLfloat), arrayOfVerticies, GL_STATIC_DRAW);
glEnableVertexAttribArray(GLKVertexAttribPosition);
glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 12, BUFFER_OFFSET(0));
glBindVertexArrayOES(0);
着色器：
attribute vec4 position;
attribute vec3 normal;
varying lowp vec4 colorVarying;
uniform mat4 modelViewProjectionMatrix;
uniform mat3 normalMatrix;
void main()
{
vec3 eyeNormal = normalize(normalMatrix * normal);
vec3 lightPosition = vec3(0.0, 0.0, 1.0);
vec4 diffuseColor = vec4(0.4, 0.4, 1.0, 1.0);
float nDotVP = max(0.0, dot(eyeNormal, normalize(lightPosition)));
colorVarying = diffuseColor * nDotVP;
gl_Position = modelViewProjectionMatrix * position;
}