Question

我正在CUDA中编写一个渲染系统，希望通过OpenGL快速显示结果，而不需要触及主内存。我基本上做了以下事情：

创建并初始化OpenGL纹理，并在CUDA中将其注册为cudaGraphicsResource

GLuint viewGLTexture;
cudaGraphicsResource_t viewCudaResource;

void initialize() {
    glEnable(GL_TEXTURE_2D);
    glGenTextures(1, &viewGLTexture);

    glBindTexture(GL_TEXTURE_2D, viewGLTexture); 
    {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, view.getWidth(), view.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    } 
    glBindTexture(GL_TEXTURE_2D, 0);

    cudaGraphicsGLRegisterImage(&viewCudaResource, viewGLTexture, GL_TEXTURE_2D, cudaGraphicsRegisterFlagsWriteDiscard)
}

每当调整视图大小时，我都会适当调整视口和纹理图像的大小：

void resize() {
    glViewport(0, 0, view.getWidth(), view.getHeight());

    glBindTexture(GL_TEXTURE_2D, viewGLTexture); 
    {
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, view.getWidth(), view.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    } 
    glBindTexture(GL_TEXTURE_2D, 0);
}

然后每个帧我通过cudaArray将graphicsResource映射为cudaSurfaceObject，在其上调用渲染内核，取消映射并同步以让OpenGL使用此纹理绘制全屏四边形：

void renderFrame() {
    cudaGraphicsMapResources(1, &viewCudaResource); 
    {
        cudaArray_t viewCudaArray;
        cudaGraphicsSubResourceGetMappedArray(&viewCudaArray, viewCudaResource, 0, 0);
        cudaResourceDesc viewCudaArrayResourceDesc;
        {
            viewCudaArrayResourceDesc.resType = cudaResourceTypeArray;
            viewCudaArrayResourceDesc.res.array.array = viewCudaArray;
        }
        cudaSurfaceObject_t viewCudaSurfaceObject;
        cudaCreateSurfaceObject(&viewCudaSurfaceObject, &viewCudaArrayResourceDesc); 
        {
            invokeRenderingKernel(viewCudaSurfaceObject);
        } 
        cudaDestroySurfaceObject(viewCudaSurfaceObject));
    } 
    cudaGraphicsUnmapResources(1, &viewCudaResource);

    cudaStreamSynchronize(0);

    glBindTexture(GL_TEXTURE_2D, viewGLTexture); 
    {
        glBegin(GL_QUADS); 
        {
            glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f);
            glTexCoord2f(1.0f, 0.0f); glVertex2f(+1.0f, -1.0f);
            glTexCoord2f(1.0f, 1.0f); glVertex2f(+1.0f, +1.0f);
            glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, +1.0f);
        } 
        glEnd();
    }
    glBindTexture(GL_TEXTURE_2D, 0);

    glFinish();
}

问题是：每当视图调整大小时，所有CUDA调用都会开始喷出＆＃34;未知错误＆＃34; s并且在视觉上看起来纹理实际上没有调整大小，只是在整个视图中拉伸。为什么会发生这种情况？如何解决？

Answer 1

似乎互操作需要在调整大小时重新注册纹理。以下作品：

void resize() {
    glViewport(0, 0, view.getWidth(), view.getHeight());

        // unregister
    cudaGraphicsUnregisterResource(viewCudaResource);
        // resize
    glBindTexture(GL_TEXTURE_2D, viewGLTexture);
    {
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, view.getWidth(), view.getHeight(), 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    }
    glBindTexture(GL_TEXTURE_2D, 0);
        // register back
    cudaGraphicsGLRegisterImage(&viewCudaResource, viewGLTexture, GL_TEXTURE_2D, cudaGraphicsRegisterFlagsWriteDiscard);
}

CUDA / OpenGL互操作，用CUDA绘制到OpenGL纹理

1 个答案: