在opengl android中绘制纹理的奇怪行为

Question

我使用三角形和顶点在opengl中绘制纹理 当它被绘制时它就像这样

问题是两侧是否画了相同的三角形？ 这是什么解决方案？ 这是我的代码？

public float m_cameraX=26.036f;
public float m_cameraY=45.126f;
public float m_cameraZ=5f;
    private final float[][] vertData = {
        {
                25.457f, 45.534f, 3.0f, 
                26.595f, 45.534f, 3.0f, 
                25.457f, 44.718f, 3.0f, 
                26.595f, 44.718f, 3.0f 
};
    vertBuffer = ByteBuffer.allocateDirect(12 * 4).order(ByteOrder.nativeOrder()).asFloatBuffer();
        vertBuffer.put(vertData[i]).position(0);
        loadtexture();
        vertBuffer.position(0);
        GLES20.glVertexAttribPointer(0, 3, GLES20.GL_FLOAT, false, 0, vertBuffer);
        GLES20.glEnableVertexAttribArray(mPositionHandle);
        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, imgHandle);
        GLES20.glUniform1i(mColorHandle, 0);
        GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mMVPMatrix, 0);
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);

Answer 1

您需要设置纹理坐标。看看这些教程：

http://obviam.net/index.php/texture-mapping-opengl-android-displaying-images-using-opengl-and-squares/ http://insanitydesign.com/wp/projects/nehe-android-ports/ http://www.learnopengles.com/android-lesson-four-introducing-basic-texturing/