Question

我的顶点着色器中有三个glsl属性

attribute highp   vec4  Position;
attribute mediump vec4  UV;
attribute mediump vec3  Normal;

使用

进行即时绑定

glBindAttribLocation(program, 0, "Position");
glBindAttribLocation(program, 1, "Normal");
glBindAttribLocation(program, 2, "UV");

但是，我收到了错误

无法找到顶点着色器属性“Normal”以匹配BindAttributeLocation请求。

为什么它可以找到Position和UV属性，但不能找到Normal属性。

任何帮助都会受到高度赞赏，因为我很困惑。

干杯

编辑：我在Android OpenGLES20上遇到了同样的问题。我将添加示例代码：该类的其余部分是官方的GLSurfaceView教程

public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {

    String mVertexShader =  "uniform mat4 uMVPMatrix;\n " +
            "attribute vec4 aPosition;\n " +
            "attribute vec4 aNormal; \n " + //this is the line I added
            "attribute vec2 aTextureCoord;\n " +
            "varying vec2 vTextureCoord;\n " +
            "void main() {\n " +
            "gl_Position = uMVPMatrix * aPosition;\n" +
            "  vTextureCoord = aTextureCoord;\n" +
            "}\n";

    mProgram = createProgram(mVertexShader, mFragmentShader); // cf tutorial
    if (mProgram == 0) {
        return;
    }
    initShaderHandles(); //initializes the rest of the handles (cf tutorial)

     // my little additional code
    int maNormalHandle = GLES20.glGetAttribLocation(mProgram, "aNormal");
    Log.d("ATTRIB LOCATION Normal: ", maNormalHandle + "");
    checkGlError("glGetAttribLocation normal");
    if (maNormalHandle == -1) {
        throw new RuntimeException(
                "Could not get attrib location for normal");
    }
    // ...and we crash.

}

Answer 1

您是在着色器中使用法线还是可以通过glsl-compiler进行优化。如果是其他内容请向我们展示您的着色器

Answer 2

您确定要将正确的索引传递给着色器吗？您可以尝试通过调用

来获取索引

glGetAttribLocation(program,"Normal");

OpenGL着色器无法绑定属性

2 个答案: