Question

这是我修改Google CardBoard示例的项目： https://github.com/MrCsabaToth/cardboard-java

（我基本上切断了一堆东西：我不需要3D音频反馈，我不会生成立方体。我没有＃34;地板＆＃34; in我的3D模型（下面渲染为网格的大表面），但我在我前面有一个表面（我称之为屏幕），在那里我将png图像渲染为纹理。因此着色器（片段和顶点）也是真的很简单。）

不幸的是我在修改过程中做错了什么，我无法弄清楚它是什么。

如果我在MainActivity（https://github.com/MrCsabaToth/cardboard-java/blob/master/CardboardSample/src/main/java/com/google/vrtoolkit/cardboard/samples/treasurehunt/MainActivity.java#L289）中取消注释第289行（GLES20.glEnableVertexAttribArray(screenNormalParam);），则启动后应用程序崩溃：

01-16 20:17:40.325 9167-9305/com.google.vrtoolkit.cardboard.samples.treasurehunt I/OpenGLRenderer: Initialized EGL, version 1.4
01-16 20:17:40.355 9167-9305/com.google.vrtoolkit.cardboard.samples.treasurehunt I/OpenGLRenderer: HWUI protection enabled for context ,  &this =0xaf440088 ,&mEglDisplay = 1 , &mEglConfig = 8 
01-16 20:17:40.355 9167-9305/com.google.vrtoolkit.cardboard.samples.treasurehunt D/OpenGLRenderer: Enabling debug mode 0
01-16 20:17:40.485 9167-9302/com.google.vrtoolkit.cardboard.samples.treasurehunt I/MainActivity: onSurfaceCreated
01-16 20:17:40.515 9167-9305/com.google.vrtoolkit.cardboard.samples.treasurehunt V/RenderScript: Application requested CPU execution
01-16 20:17:40.525 9167-9302/com.google.vrtoolkit.cardboard.samples.treasurehunt W/Adreno-ES20: <core_glEnableVertexAttribArray:193>: GL_INVALID_VALUE
01-16 20:17:40.525 9167-9302/com.google.vrtoolkit.cardboard.samples.treasurehunt E/MainActivity: Screen program params: glError 1281
01-16 20:17:40.535 9167-9305/com.google.vrtoolkit.cardboard.samples.treasurehunt V/RenderScript: 0xa126c400 Launching thread(s), CPUs 4
01-16 20:17:40.545 9167-9302/com.google.vrtoolkit.cardboard.samples.treasurehunt E/AndroidRuntime: FATAL EXCEPTION: GLThread 231450
                                                                                               Process: com.google.vrtoolkit.cardboard.samples.treasurehunt, PID: 9167
                                                                                               java.lang.RuntimeException: Screen program params: glError 1281
                                                                                                   at com.google.vrtoolkit.cardboard.samples.treasurehunt.MainActivity.checkGLError(MainActivity.java:177)
                                                                                                   at com.google.vrtoolkit.cardboard.samples.treasurehunt.MainActivity.onSurfaceCreated(MainActivity.java:292)
                                                                                                   at com.google.vrtoolkit.cardboard.CardboardViewNativeImpl$RendererHelper.callOnSurfaceCreated(CardboardViewNativeImpl.java:811)
                                                                                                   at com.google.vrtoolkit.cardboard.CardboardViewNativeImpl$RendererHelper.onSurfaceCreated(CardboardViewNativeImpl.java:832)
                                                                                                   at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1509)
                                                                                                   at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)

我的主要问题是，我没有真正得到有关错误的详细信息，glError 1281非常广泛。通过反复试验，我发现在评论了289行（如上所述）后，应用程序启动并且看起来像是正常运行，但它会使LogCat充满这种情况（不好）：

01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/Adreno-ES20: <core_glVertexAttribPointer:533>: GL_INVALID_VALUE
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt E/MainActivity: drawing screen: glError 1281
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err: java.lang.RuntimeException: drawing screen: glError 1281
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at com.google.vrtoolkit.cardboard.samples.treasurehunt.MainActivity.checkGLError(MainActivity.java:177)
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at com.google.vrtoolkit.cardboard.samples.treasurehunt.MainActivity.drawScreen(MainActivity.java:406)
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at com.google.vrtoolkit.cardboard.samples.treasurehunt.MainActivity.onDrawEye(MainActivity.java:368)
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at com.google.vrtoolkit.cardboard.CardboardViewNativeImpl.nativeOnDrawFrame(Native Method)
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at com.google.vrtoolkit.cardboard.CardboardViewNativeImpl.access$3200(CardboardViewNativeImpl.java:52)
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at com.google.vrtoolkit.cardboard.CardboardViewNativeImpl$RendererHelper.onDrawFrame(CardboardViewNativeImpl.java:741)
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1531)
01-16 16:38:57.984 30664-30723/com.google.vrtoolkit.cardboard.samples.treasurehunt W/System.err:     at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1248)

调用堆栈只是引导我到checkGLError，这导致我使用通用glError 1281。我是OpenGL调试的新手，感谢任何帮助。

Answer 1

在我的简单着色器中，我并没有用法线计算。我注意到screenNormalParam整数的值为-1。我修改了顶点着色器并添加了一个varying vec3 v_Normal变量。我仍然没有将此变量用于任何计算，因为闪电对我的应用程序并不重要，但我只是做了一个虚拟任务v_Normal = a_Normal：

uniform mat4 u_Model;
uniform mat4 u_MVMatrix;
uniform mat4 u_MVP;

attribute vec4 a_Position;
attribute vec3 a_Normal;
attribute vec2 a_TexCoordinate;

varying vec2 v_TexCoordinate;
varying vec3 v_Normal;

void main() {
   v_TexCoordinate = a_TexCoordinate;
   v_Normal = a_Normal;

   gl_Position = u_MVP * a_Position;
}

screenModelParam（u_Model）和screenModelViewParam（u_MVMatrix）仍然是-1，但它们不像u_MVP那样使用，我不会＆＃39 ; t对他们打电话GLES20.glEnableVertexAttribArray。到目前为止，我现在还没有看到错误消息，但我不明白为什么需要虚拟变量，我想我需要了解有关着色器的更多信息。

模型法线（或其他）的GLES 2.0错误

1 个答案: