Question

我有一个应用程序，我想使用模板蒙版为纹理渲染深度。我尝试了GL_DEPTH_STENCIL_OES：

创建纹理：

glGenFramebuffers(1, fbo);
glBindFramebuffer(GL_FRAMEBUFFER, *fbo);

glGenTextures(1, depthTexture);
glBindTexture(GL_TEXTURE_2D, *depthTexture);
// using combined format: depth + stencil
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_OES, w, h, 0, GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);

// attaching both depth and stencil
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, *depthTexture, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, *depthTexture, 0);

// No color output in the bound framebuffer, only depth.
GLenum drawbuffers[] = { GL_NONE };
glDrawBuffers(1, drawbuffers);

GL_CHECK(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE);

为阴影贴图创建模板蒙版：

// bind to depth fbo
glBindFramebuffer(GL_FRAMEBUFFER, *fbo);

glEnable(GL_STENCIL_TEST);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glClear(GL_STENCIL_BUFFER_BIT);

// write to stencil when objects are rendered
glStencilFunc(GL_ALWAYS, 1, 0xFF);
glStencilMask(0xFF);

drawVisibleObjects();

使用模板掩模渲染深度：

glBindFramebuffer(GL_FRAMEBUFFER, *fbo);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_EQUAL, 1, 0xFF); // Pass test if stencil value is 1
glStencilMask(0x00); // Don't write anything to stencil buffer
glDepthMask(GL_TRUE); // Write to depth buffer

drawObjects();

执行代码时，屏幕为黑色。这是意料之外的，因为我不会将深度渲染到默认的帧缓冲区，而是渲染到纹理。由于模板值存储在纹理中，我是否必须以不同方式使用它们？

使用组合深度模板纹理GL_DEPTH_STENCIL_OES时，使用模板附件的正确方法是什么？

Answer 1

模板值是您渲染到的帧缓冲区的属性。如果要在FBO0中使用模板掩码，则需要在FBO0中请求模板（并在渲染到FBO0时填充掩码等）。

如何使用模板，OpenGL ES 3.0使用深度纹理

1 个答案: