相关疑难解决方法(0)

我已经看过很多关于这个主题的材料,但是我发现的例子之间存在一些差异,而且我很难深入了解正确的过程.希望有人可以告诉我,如果我走在正确的轨道上.我还应该提到我在OS X Snow Leopard和最新版本的Xcode 3上做这个.

举个例子,假设我想写两个目标,一个用于普通,一个用于颜色.为此,我创建了一个帧缓冲区并将两个纹理绑定到它,以及深度纹理:

glGenFramebuffersEXT(1, &mFBO);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, mFBO);

glGenTextures(1, &mTexColor);
glBindTexture(GL_TEXTURE_2D, mTexColor);
//<texture params>
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, mTexColor, 0);

glGenTextures(1, &mTexNormal);
glBindTexture(GL_TEXTURE_2D, mTexNormal);
//<Texture params>
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT, GL_TEXTURE_2D, mTexNormal, 0);

glGenTextures(1, &mTexDepth);
glBindTexture(GL_TEXTURE_2D, mTexDepth);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, w, h, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_TEXTURE_2D, mTexDepth, 0);

glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0)

在渲染之前,我会再次绑定帧缓冲,然后执行:

GLenum buffers[] = { GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT };
glDrawBuffers(2, buffers); …