opengl - OpenGL + PBO + FBO + 一部の ATI カード - 色とピクセルのシフト

Question

スライドショー作成用のソフトウェアを開発しており、OpenGLを使用しています。VGA から RAM への高速データ読み取りには FBO + PBO を使用しますが、ATI の一部のビデオカードでは次の問題に直面しました。

RGB コンポーネントの交換
ピクセルシフト

PBOを使わなくても問題ありません。また、PBO/FBO (4:3) のアスペクト比がピクセルシフトの問題を解決することにも気付きました。

何か考えや提案はありますか？

詳細は次のとおりです。

ATI Radeon HD 3650

PBO コード:

public bool PBO_Initialize(
        int bgl_size_w,
        int bgl_size_h)
    {
        PBO_Release();
        if (mCSGL12Control1 != null)
        {
            GL mGL = mCSGL12Control1.GetGL();
            mCSGL12Control1.wgl_MakeCurrent();
            //
            // check PBO is supported by your video card
            if (mGL.bglGenBuffersARB == true &&
                mGL.bglBindBufferARB == true &&
                mGL.bglBufferDataARB == true &&
                mGL.bglBufferSubDataARB == true &&
               mGL.bglMapBufferARB == true &&
               mGL.bglUnmapBufferARB == true &&
               mGL.bglDeleteBuffersARB == true &&
               mGL.bglGetBufferParameterivARB == true)
            {
                mGL.glGenBuffersARB(2, _pbo_imageBuffers);
                int clientHeight1 = bgl_size_h / 2;
                int clientHeight2 = bgl_size_h - clientHeight1;
                int clientSize1 = bgl_size_w * clientHeight1 * 4;
                int clientSize2 = bgl_size_w * clientHeight2 * 4;


                mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[0]);
                mGL.glBufferDataARB(GL.GL_PIXEL_PACK_BUFFER_ARB, clientSize1, IntPtr.Zero,
                                GL.GL_STREAM_READ_ARB);

                mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[1]);
                mGL.glBufferDataARB(GL.GL_PIXEL_PACK_BUFFER_ARB, clientSize2, IntPtr.Zero,
                                GL.GL_STREAM_READ_ARB);

                return true;
            }
        }
        return false;
    }

... PBO 読み取りデータをメモリに戻す

                    int clientHeight1 = _bgl_size_h / 2;
                    int clientHeight2 = _bgl_size_h - clientHeight1;
                    int clientSize1 = _bgl_size_w * clientHeight1 * 4;
                    int clientSize2 = _bgl_size_w * clientHeight2 * 4;
                    //mGL.glPushAttrib(GL.GL_VIEWPORT_BIT | GL.GL_COLOR_BUFFER_BIT);

                    // Bind two different buffer objects and start the glReadPixels
                    // asynchronously. Each call will return directly after
                    // starting the DMA transfer.
                    mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[0]);
                    mGL.glReadPixels(0, 0, _bgl_size_w, clientHeight1, imageFormat,
                                    pixelTransferMethod, IntPtr.Zero);

                    mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[1]);
                    mGL.glReadPixels(0, clientHeight1, _bgl_size_w, clientHeight2, imageFormat,
                                    pixelTransferMethod, IntPtr.Zero);

                    //mGL.glPopAttrib();
                    mGL.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, 0);

                    // Process partial images.  Mapping the buffer waits for
                    // outstanding DMA transfers into the buffer to finish.
                    mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[0]);
                    IntPtr pboMemory1 = mGL.glMapBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB,
                                                GL.GL_READ_ONLY_ARB);

                    mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[1]);
                    IntPtr pboMemory2 = mGL.glMapBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB,
                                                GL.GL_READ_ONLY_ARB);


                    System.Runtime.InteropServices.Marshal.Copy(pboMemory1, _bgl_rgbaData_out, 0, clientSize1);
                    System.Runtime.InteropServices.Marshal.Copy(pboMemory2, _bgl_rgbaData_out, clientSize1, clientSize2);


                    // Unmap the image buffers
                    mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[0]);
                    mGL.glUnmapBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB);
                    mGL.glBindBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB, _pbo_imageBuffers[1]);
                    mGL.glUnmapBufferARB(GL.GL_PIXEL_PACK_BUFFER_ARB);

FBO の初期化

private static void FBO_Initialize(GL mGL,
        ref int[] bgl_texture,
        ref int[] bgl_framebuffer,
        ref int[] bgl_renderbuffer,
        ref byte[] bgl_rgbaData,
        int bgl_size_w,
        int bgl_size_h)
    {
        // Texture
        mGL.glGenTextures(1, bgl_texture);
        mGL.glBindTexture(GL.GL_TEXTURE_2D, bgl_texture[0]);

        mGL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
        mGL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
        mGL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
        mGL.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
        IntPtr null_ptr = new IntPtr(0);
        // <null> means reserve texture memory, but texels are undefined
        mGL.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA, bgl_size_w, bgl_size_h, 0, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, null_ptr);
        //
        mGL.glGenFramebuffersEXT(1, bgl_framebuffer);
        mGL.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, bgl_framebuffer[0]);

        mGL.glGenRenderbuffersEXT(1, bgl_renderbuffer);
        mGL.glBindRenderbufferEXT(GL.GL_RENDERBUFFER_EXT, bgl_renderbuffer[0]);
        mGL.glRenderbufferStorageEXT(GL.GL_RENDERBUFFER_EXT, GL.GL_DEPTH_COMPONENT24, bgl_size_w, bgl_size_h);


        mGL.glFramebufferTexture2DEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_COLOR_ATTACHMENT0_EXT,
            GL.GL_TEXTURE_2D, bgl_texture[0], 0);
        mGL.glFramebufferRenderbufferEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_DEPTH_ATTACHMENT_EXT,
            GL.GL_RENDERBUFFER_EXT, bgl_renderbuffer[0]);

        // Errors?
        int status = mGL.glCheckFramebufferStatusEXT(GL.GL_FRAMEBUFFER_EXT);
        if (status != GL.GL_FRAMEBUFFER_COMPLETE_EXT || mGL.glGetError() != GL.GL_NO_ERROR)
        {
            mGL.glFramebufferTexture2DEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_COLOR_ATTACHMENT0_EXT,
                GL.GL_TEXTURE_2D, 0, 0);
            mGL.glFramebufferRenderbufferEXT(GL.GL_FRAMEBUFFER_EXT, GL.GL_DEPTH_ATTACHMENT_EXT,
                GL.GL_RENDERBUFFER_EXT, 0);

            mGL.glBindTexture(GL.GL_TEXTURE_2D, 0);
            mGL.glDeleteTextures(1, bgl_texture);
            mGL.glBindRenderbufferEXT(GL.GL_RENDERBUFFER_EXT, 0);
            mGL.glDeleteRenderbuffersEXT(1, bgl_renderbuffer);
            mGL.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, 0);
            mGL.glDeleteFramebuffersEXT(1, bgl_framebuffer);

            throw new Exception("Bad framebuffer.");
        }

        mGL.glDrawBuffer(GL.GL_COLOR_ATTACHMENT0_EXT);
        mGL.glReadBuffer(GL.GL_COLOR_ATTACHMENT0_EXT); // For glReadPixels()

        mGL.glBindFramebufferEXT(GL.GL_FRAMEBUFFER_EXT, 0);

        mGL.glDrawBuffer(GL.GL_BACK);
        mGL.glReadBuffer(GL.GL_BACK);
        mGL.glBindTexture(GL.GL_TEXTURE_2D, 0);

        bgl_rgbaData = new byte[bgl_size_w * bgl_size_h * 4];
    }

ここに画像の説明を入力

opengl - OpenGL + PBO + FBO + 一部の ATI カード - 色とピクセルのシフト

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