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POworking with multiple Textures in OpenGL ES 2.0
 

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  1. POworking with multiple Textures in OpenGL ES 2.0
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    <p>I ran into a problem latley.</p> <p>I have a class DrawableTexturedPlane. This class specifies a simple Plane with a byte array as Texture. The array data can be changed by a simple function call. Well, the class takes a specific shader program as parameter. In my OpenGL View, i need 2 of those planes. Well, the first renders correctly, but the second does not show up at all. Im quite sure im missing something, but i am not sure which part of my code is incorrect. I would appreciate any help ;)</p> <p>TexturedPlaneClass (relevant parts):</p> <pre><code>public DrawableTexturedPlane( float[] fVertices, int nProgrammHandle, int nGLTextureChannel, int nGLTextureID ) { super( nProgrammHandle ); m_bHasBorder = bHasBorder; m_nGLTextureChannel = nGLTextureChannel; m_oVertexBuffer = _GetVertexBuffer( fVertices ); m_oTextureBuffer = _GetTextureCoordinates(); GLES20.glActiveTexture( m_nGLTextureChannel ); // Set filtering GLES20.glTexParameterf( GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST ); GLES20.glTexParameterf( GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST ); GLES20.glTexParameteri( GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE ); GLES20.glTexParameteri( GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE ); m_cTexture = new byte[ 640 * 480 ]; Log.i( "Java/DrawableTexturedPlane", "Drawable Textured Plane created!" ); } </code></pre> <p>the Draw Method:</p> <pre><code> @Override public void Draw( float[] mvpMatrix ) { GLES20.glActiveTexture( m_nGLTextureChannel ); GLES20.glEnable(GLES20.GL_TEXTURE_2D); GLES20.glEnable(GLES20.GL_DEPTH_TEST); GLES20.glUseProgram( m_nProgramHandle ); m_HTextureUniform = GLES20.glGetUniformLocation( m_nProgramHandle, "uTexture" ); m_HTextureCoordinate = GLES20.glGetAttribLocation( m_nProgramHandle, "TexCoordinate" ); // get handle to the vertex shader's vPosition member m_nPositionHandle = GLES20.glGetAttribLocation( m_nProgramHandle, "vPosition" ); ByteBuffer oDataBuf = ByteBuffer.wrap( m_cTexture ); // Prepare the triangle data GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE, 640, 480, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, oDataBuf ); // Prepare the triangle data GLES20.glVertexAttribPointer( m_nPositionHandle, 3, GLES20.GL_FLOAT, false, 12, m_oVertexBuffer ); GLES20.glEnableVertexAttribArray( m_nPositionHandle ); GLES20.glVertexAttribPointer( m_HTextureCoordinate, 2, GLES20.GL_FLOAT, false, 12, m_oTextureBuffer); GLES20.glEnableVertexAttribArray( m_HTextureCoordinate ); m_nMVPMatrixHandle = GLES20.glGetUniformLocation( m_nProgramHandle, "uMVPMatrix"); // Apply the projection and view transformation GLES20.glUniformMatrix4fv( m_nMVPMatrixHandle, 1, false, mvpMatrix, 0); GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 6); } </code></pre> <p>Here is how the textures and the 2 planes are created:</p> <pre><code> GLES20.glGenTextures( m_nTextureStorage.length, m_nTextureStorage, 0); for( int i : m_nTextureStorage ) { GLES20.glBindTexture( GLES20.GL_TEXTURE_2D, i ); } m_oInfoPlane = new DrawableTexturedPlane( oInfoRect.GetAsFloatArray(), true, m_nShaderPrograms[0], GLES20.GL_TEXTURE0, m_nTextureStorage[0] ); m_oMainPlane = new DrawableTexturedPlane( oMainRect.GetAsFloatArray(), true, m_nShaderPrograms[0], GLES20.GL_TEXTURE1, m_nTextureStorage[1] ); </code></pre> <p>Well the point is, if i initialize BOTH wirh GL_TEXTURE0, it works fine. (Although heavy flickering occurs after 10 - 20 seconds, i dont know why ).</p> <p>If i initialize them the way i did it above, only the one with TEXTURE_0 is shown correctly, the other one apperas to be black. </p> <p>I know i should write a TextureManager class, but for 2 Textures, this is a simple overkill.</p> <p>Thanks in advance</p>
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