Question

我想绘制纹理四边形，但纹理每帧都在变化。我的纹理是128x128 rgb数组。我将每个像素的rgb值存储在该数组中，我每帧都在更改该数组。我的窗口大小也是1024x1024。我希望我的像素阵列全屏，所以我创建一个纹理并将此纹理添加到一个全尺寸的四边形。我怎样才能做到这一点？

Answer 1

GLuint texID;

void initphase()
{
    /* create texture object */
    glGenTextures(1, &texID)
    /* bind texture and allocate storage */
    glBindTexture(GL_TEXTURE_2D, texID);
    glTexImage2D(GL_TEXTURE_2D,
        …,
        NULL /* just initialize */
    );
    /* alternative:
     * Use glTexStorage instead of glTexImage.
     * Requires a few changed in how texture is used though */

    /* set parameters like filtering mode, and such */
    glTexParameteri(…);
}

void player()
{
    while(playing){
        glClear(…);
        glViewport(…);

        /* draw other stuff */

        glBindTexture(GL_TEXTURE_2D, texID);
        /* copy image to texture */
        glTexSubImage2D(GL_TEXTURE_2D, 0, …, image_data);
        if( using_shaders ){
             glUseProgram(…);
             setup_modelview_and_projection_uniforms();
        } else {
             glEnable(GL_TEXTURE_2D);
             setup_modelview_and_projection_matrices();
        }
        glDraw…(…); /* draw quad */

        /* draw other stuff */
        swap_buffers();
    }
}

Opengl渲染动态纹理四边形

1 个答案: