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最近我开始开发一些简单的 opengl es 2.0 android 应用程序，但我遇到了动画速度问题。平均 fps 始终等于 60（每 100 帧测量一次），但有时动画会在很短的时间内卡顿。即使在渲染单个三角形时也会发生这种情况。当动画继续时我没有分配，并且在动画期间 log​​cat 中没有 GC 事件。

在渲染循环中执行的代码：

public void draw( GLFloatBuffer positionBuffer, int positionBufferOffset, int trianglesCount )
{
    GLES20.glUseProgram( activeGLProgram.glProgramId );

    // Set mvpMatrixValue
    int u_MvpMatrixLocation = GLES20.glGetUniformLocation( activeGLProgram.glProgramId, U_MVP_MATRIX_NAME );
    GLES20.glUniformMatrix4fv( u_MvpMatrixLocation, 1, false, mvpMatrix, 0 );

    // Set vertex position stream
    int a_VertexPositionLocation = GLES20.glGetAttribLocation( activeGLProgram.glProgramId, A_VERTEX_POSITION_NAME );
    GLES20.glBindBuffer( GLES20.GL_ARRAY_BUFFER, positionBuffer.glBufferId );
    GLES20.glEnableVertexAttribArray( a_VertexPositionLocation );

    GLES20.glVertexAttribPointer( a_VertexPositionLocation, POSITION_COORDINATES_PER_VERTEX,
                                  GLES20.GL_FLOAT, false,
                                  0, positionBufferOffset * GLUtilities.BYTES_PER_FLOAT );

    // Draw shape
    GLES20.glDrawArrays( GLES20.GL_TRIANGLES, 0, trianglesCount * 3 );

    // Clear state
    GLES20.glDisableVertexAttribArray( a_VertexPositionLocation );
    GLES20.glBindBuffer( GLES20.GL_ARRAY_BUFFER, 0 );
}

剩下的代码就是简单的 GLSurfaceView 和 GLSurfaceView.Renderer

测量

调试输出格式为：

D/FRAMERATE：最后 100 帧的平均 fps

D/FRAMERATE：最后 100 帧的最慢帧渲染时间

D/FRAMERATE：最近 100 帧的最快帧渲染时间

测量 Galaxy S II：

D/FRAMERATE:(24052): 59.018566
D/FRAMERATE:(24052): maxTimeDiff = 77ms <----
D/FRAMERATE:(24052): minTimeDiff = 3ms
D/FRAMERATE:(24052): 59.900166
D/FRAMERATE:(24052): maxTimeDiff = 24ms
D/FRAMERATE:(24052): minTimeDiff = 10ms
D/FRAMERATE:(24052): 59.780804
D/FRAMERATE:(24052): maxTimeDiff = 28ms
D/FRAMERATE:(24052): minTimeDiff = 10ms
D/FRAMERATE:(24052): 59.4882
D/FRAMERATE:(24052): maxTimeDiff = 32ms
D/FRAMERATE:(24052): minTimeDiff = 3ms
D/FRAMERATE:(24052): 59.840427
D/FRAMERATE:(24052): maxTimeDiff = 24ms
D/FRAMERATE:(24052): minTimeDiff = 9ms
D/FRAMERATE:(24052): 59.920105
D/FRAMERATE:(24052): maxTimeDiff = 22ms
D/FRAMERATE:(24052): minTimeDiff = 12ms
.
.
.
D/FRAMERATE:(24052): 59.116573
D/FRAMERATE:(24052): maxTimeDiff = 68 <--- Here it happend again
D/FRAMERATE:(24052): minTimeDiff = 8

HTC Desire Z 上似乎没有出现问题：

D/FRAMERATE: (28788): maxTimeDiff = 20ms
D/FRAMERATE: (28788): minTimeDiff = 15ms
D/FRAMERATE: (28788): 58.27506
D/FRAMERATE: (28788): maxTimeDiff = 22ms
D/FRAMERATE: (28788): minTimeDiff = 12ms
D/FRAMERATE: (28788): 58.27506
D/FRAMERATE: (28788): maxTimeDiff = 22ms
D/FRAMERATE: (28788): minTimeDiff = 14ms
D/FRAMERATE: (28788): 58.27506
D/FRAMERATE: (28788): maxTimeDiff = 20ms
D/FRAMERATE: (28788): minTimeDiff = 14ms

除了编写本机 ndk 代码之外，任何人都可以帮助寻找解决方案吗？

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