我正在尝试使用samplerCube和textureCube在着色器上应用不同的纹理.

但是我无法在立方体的面上绘制纹理,只出现单一颜色.

Screenshots of output

以下是我的着色器代码：

顶点着色器

String strVShader = "attribute vec4 a_position;" +
            "uniform mat4 u_VPMatrix;" +
            "attribute vec3 a_normal;" +
            "varying vec3 v_normal;" +
            "void main()" +
            "{" +
                "gl_Position = u_VPMatrix * a_position;" +
                "v_normal = a_normal;" +
            "}";

片段着色器

String strFShader = "precision mediump float;" +
            "uniform samplerCube u_texId;" +
            "varying vec3 v_normal;" +
            "void main()" +
            "{" +
                "gl_FragColor = textureCube(u_texId,v_normal);" +
            "}";

立方体定义

float[] cube = {
        2,2,-2,//0-1-2-3 front
        2,//0-3-4-5 right
        2,//4-7-6-5 back
        -2,//1-6-7-2 left
        2,//top
        2,//bottom
    };
short[] indeces = {0,1,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,};
float[] normals = {
                  0,//front
                   1,// right
                   0,-1,//back
                   -1,// left
                   0,//  top                  
                   0,// bottom
     }; 

OnDrawFrame

public void onDrawFrame(GL10 arg0) {
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        GLES20.glUseProgram(iProgId);
        cubeBuffer.position(0);
        GLES20.glVertexAttribPointer(iPosition,GLES20.GL_FLOAT,false,cubeBuffer);
        GLES20.glEnableVertexAttribArray(iPosition);
        GLES20.glVertexAttribPointer(iNormal,normBuffer);
        GLES20.glEnableVertexAttribArray(iNormal);
        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        GLES20.glBindTexture(GLES20.GL_TEXTURE_CUBE_MAP,iTexId);
        GLES20.glUniform1i(iTexLoc,0);
        Matrix.setIdentityM(m_fIdentity,0);
        Matrix.rotateM(m_fIdentity,-xAngle,-yAngle,0);
        Matrix.multiplyMM(m_fVPMatrix,m_fViewMatrix,m_fIdentity,m_fProjMatrix,m_fVPMatrix,0);
        GLES20.glUniformMatrix4fv(iVPMatrix,0);
        GLES20.glDrawElements(GLES20.GL_TRIANGLES,36,GLES20.GL_UNSIGNED_SHORT,indexBuffer);
    }

创建多维数据集地图代码

public int CreateCubeTexture()
    {
            ByteBuffer fcbuffer = null;
            int[] cubeTex = new int[1];
            GLES20.glGenTextures(1,cubeTex,0);
            GLES20.glBindTexture(GLES20.GL_TEXTURE_CUBE_MAP,cubeTex[0]);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_CUBE_MAP,GLES20.GL_TEXTURE_MIN_FILTER,GLES20.GL_NEAREST);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_CUBE_MAP,GLES20.GL_TEXTURE_MAG_FILTER,GLES20.GL_TEXTURE_WRAP_S,GLES20.GL_CLAMP_TO_EDGE);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_CUBE_MAP,GLES20.GL_TEXTURE_WRAP_T,GLES20.GL_CLAMP_TO_EDGE);
            Bitmap img = null;
            img = BitmapFactory.decodeResource(curView.getResources(),R.raw.brick1);
            fcbuffer = ByteBuffer.allocateDirect(img.getHeight() * img.getWidth() * 4);
            img.copyPixelsToBuffer(fcbuffer);
            fcbuffer.position(0);
            Log.d("alpha",""+img.hasAlpha());
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_X,GLES20.GL_RGBA,img.getWidth(),img.getHeight(),GLES20.GL_UNSIGNED_BYTE,fcbuffer);
            fcbuffer = null;
            img.recycle();
            img = BitmapFactory.decodeResource(curView.getResources(),R.raw.brick2);
            fcbuffer = ByteBuffer.allocateDirect(img.getHeight() * img.getWidth() * 4);
            img.copyPixelsToBuffer(fcbuffer);
            fcbuffer.position(0);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_X,R.raw.brick3);
            fcbuffer = ByteBuffer.allocateDirect(img.getHeight() * img.getWidth() * 4);
            img.copyPixelsToBuffer(fcbuffer);
            fcbuffer.position(0);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_Y,fcbuffer);
            fcbuffer = null;
            img.recycle();
            img = BitmapFactory.decodeResource(curView.getResources(),R.raw.brick4);
            fcbuffer = ByteBuffer.allocateDirect(img.getHeight() * img.getWidth() * 4);
            img.copyPixelsToBuffer(fcbuffer);
            fcbuffer.position(0);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,R.raw.brick5);
            fcbuffer = ByteBuffer.allocateDirect(img.getHeight() * img.getWidth() * 4);
            img.copyPixelsToBuffer(fcbuffer);
            fcbuffer.position(0);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_Z,R.raw.brick6);
            fcbuffer = ByteBuffer.allocateDirect(img.getHeight() * img.getWidth() * 4);
            img.copyPixelsToBuffer(fcbuffer);
            fcbuffer.position(0);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,fcbuffer);
            fcbuffer = null;
            img.recycle();
            GLES20.glGenerateMipmap(GLES20.GL_TEXTURE_CUBE_MAP);
            return cubeTex[0];
    }

我无法理解我犯错误的地方.

如果你想看到完整的代码.

解：

使用相同的立方体绘制坐标用于纹理坐标

Thanx all

CODE Link