Hi, I’m trying to have a FBO with separate depth and stencil buffers.
I know that NVidia GPU’s historically only supported packed depth/stencil.
However I stumbled on the ARB_texture_stencil8 extension and wonder how to use it against a FBO.
My code gives gl error 1159 on glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_TEXTURE_2D, fboStencilTexture, 0):
static GLuint fboId, rboDepth, rboStencil, TEXTURE_WIDTH, TEXTURE_HEIGHT;
if (!fboColorTexture) {
fboDepthTexture = fboId = rboDepth = rboStencil = TEXTURE_WIDTH = TEXTURE_HEIGHT = 0; // vid restart?
glGenTextures(1, &fboColorTexture);
glBindTexture(GL_TEXTURE_2D, fboColorTexture);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
if (!fboDepthTexture) {
glGenTextures(1, &fboDepthTexture);
glBindTexture(GL_TEXTURE_2D, fboDepthTexture);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
if (!fboStencilTexture) {
glGenTextures(1, &fboStencilTexture);
glBindTexture(GL_TEXTURE_2D, fboStencilTexture);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
qglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
GLuint curWidth = r_virtualResolution.GetFloat() * glConfig.vidWidth, curHeight = r_virtualResolution.GetFloat() * glConfig.vidHeight;
if (curWidth != TEXTURE_WIDTH || curHeight != TEXTURE_HEIGHT) {
TEXTURE_WIDTH = curWidth;
TEXTURE_HEIGHT = curHeight;
glBindTexture(GL_TEXTURE_2D, fboColorTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5_A1, TEXTURE_WIDTH, TEXTURE_HEIGHT, 0, GL_BGRA, GL_UNSIGNED_BYTE, NULL); //NULL means reserve texture memory, but texels are undefined
glBindTexture(GL_TEXTURE_2D, fboDepthTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT16, TEXTURE_WIDTH, TEXTURE_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
glBindTexture(GL_TEXTURE_2D, fboStencilTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_STENCIL_INDEX8, TEXTURE_WIDTH, TEXTURE_HEIGHT, 0, GL_STENCIL_INDEX, GL_FLOAT, 0);
}
//-------------------------
if (!fboId) {
// create a framebuffer object, you need to delete them when program exits.
glGenFramebuffersEXT(1, &fboId);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboId);
// attach a texture to FBO color attachement point
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, fboColorTexture, 0);
// attach a renderbuffer to depth attachment point
//glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, rboDepth);
//glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, separateStencil ? rboStencil : rboDepth);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, fboDepthTexture, 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_TEXTURE_2D, fboStencilTexture, 0);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboId);