从计算着色器生成深度图

Question

我对 opengl 很陌生，尤其是在纹理和贴图方面

const unsigned int SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;

unsigned int depthMapFBO;

glGenFramebuffers(1, &depthMapFBO);

// create depth texture

unsigned int depthMap;

glGenTextures(1, &depthMap);

glBindTexture(GL_TEXTURE_2D, depthMap);

glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

// attach depth texture as FBO's depth buffer

glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);

glDrawBuffer(GL_NONE);

glReadBuffer(GL_NONE);

glBindFramebuffer(GL_FRAMEBUFFER, 0);
glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);

    glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);

        glClear(GL_DEPTH_BUFFER_BIT);

        glActiveTexture(GL_TEXTURE0);

渲染场景（简单深度着色器）；

    glBindFramebuffer(GL_FRAMEBUFFER,0);
glBindFramebuffer(GL_FRAMEBUFFER,0);

glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glActiveTexture(GL_TEXTURE1);

glBindTexture(GL_TEXTURE_2D, depthMap);

renderScene(makeshadow);

第一次通过（simpleDepthShader）**着色器生成深度图，第二次通过**（makeshadow）**着色器使用深度图并在片段着色器中制作阴影

我如何使用从第一个着色器通道生成的深度图**（simpleDepthShader）**，然后将其作为第二个着色器通道传递给计算着色器，然后将其复制到计算着色器中，深度图的新副本将通过

(makeshadow)shader