OpenGLES 2.0:是否具有gl_VertexID? [英] OpenGLES 2.0: gl_VertexID equivalent?

问题描述

我试图根据发送到着色器的顶点数组中的索引，通过动态计算顶点位置来创建点的网格.是否可以在着色器中调用gl_VertexID变量的等效项?还是另一种无需在GPU中发送更多数据即可访问它们在阵列中的位置的方法?谢谢，乔什.

I'm trying to create a grid of points by calculating vertex positions dynamically, based on their index in the array of vertices sent to the shader. Is there an equivalent of the gl_VertexID variable that I can call from within my shader? Or another way of accessing their position in the array without having to send more data to the GPU? Thank, Josh.

这是我的顶点着色器:

attribute vec4 vertexPosition;
uniform mat4 modelViewProjectionMatrix;
vec4 temp;
uniform float width;

void main()
{    
    temp = vertexPosition;

    // Calculate x and y values based on index:
    temp.y = floor(gl_VertexID/width);
    temp.x = gl_VertexID - width*temp.y;

    gl_Position = modelViewProjectionMatrix * temp;
}

推荐答案

不幸的是，GLES2中没有gl_VertexID等效项.您必须自己创建并传递其他数据.

Unfortunately there is no gl_VertexID equivalent in GLES2. You must create and pass additional data yourself.

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