OpenGL C++闭包查询

Question

在赫里斯特·埃里克森的“碰撞检测”一书中，他给出了一种用以下算法检测凸多边形间碰撞的加速GPU方法。

我对OpenGL完全陌生，我的问题是，给出两个std::vector点如下：

struct Point{
    double x,
    double y, 
}

如何将此std::vector<Point>传递给以下函数并在C++中返回结果？我的向量是凸多边形序CCW。

// Initialize depth buffer to far Z (1.0)
glClearDepth(1.0f);
glClear(GL_DEPTH_BUFFER_BIT);
// Disable color buffer writes
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
// Enable depth testing
glEnable(GL_DEPTH_TEST);
// Initialize occlusion queries
Gluint query[1], numSamplesRendered;
glGenQueries(1, query);
// Set pixels to always write depth
glDepthFunc(GL_ALWAYS);
glDepthMask(GL_TRUE);
// Draw front faces of object A
glCullFace(GL_BACK);
RenderObject(A);
// Pass pixels if depth is greater than current depth value
glDepthFunc(GL_GREATER);
// Disable depth buffer updates
glDepthMask(GL_FALSE);
// Render back faces of B with occlusion testing enabled
glBeginQuery(GL_SAMPLES_PASSED, query[0]);
glCullFace(GL_FRONT);
RenderObject(B);
glEndQuery(GL_SAMPLES_PASSED);
// If occlusion test indicates no samples rendered, exit with no collision
glGetQueryObjectuiv(query[0], GL_QUERY_RESULT, &numSamplesRendered);
if (numSamplesRendered == 0) return NO_COLLISION;
// Set pixels to always write depth
glDepthFunc(GL_ALWAYS);
glDepthMask(GL_TRUE);
// Draw front faces of object B
glCullFace(GL_BACK);
RenderObject(B);
// Pass pixels if depth is greater than current depth value
glDepthFunc(GL_GREATER);
// Disable depth buffer updates
glDepthMask(GL_FALSE);
// Render back faces of A with occlusion testing enabled
glBeginQuery(GL_SAMPLES_PASSED, query[0]);
glCullFace(GL_FRONT);
RenderObject(A);
glEndQuery(GL_SAMPLES_PASSED);
// If occlusion test indicates no pixels rendered, exit with no collision
glGetQueryObjectuiv(query[0], GL_QUERY_RESULT, &numSamplesRendered);
if (numSamplesRendered == 0) return NO_COLLISION;
// Objects A and B must be intersecting
return COLLISION;

Answer 1

一种可能的方式是：

1. 您需要将您的std::vector<Point>传递给一个函数，该函数将更新对象的缓冲区(顶点/索引) (A或B或两者兼有)。
2. 调用将执行遮挡查询和返回结果的函数。可能是你的情况下的布尔值