OpenGL 3.1和Oculus Rift的glFramebufferTexture的替代品 [英] Alternative to glFramebufferTexture for OpenGL version 3.1 and Oculus Rift

问题描述

因此，Oculus Rift SDK接受使用 glFramebufferTexture 函数创建的帧缓冲纹理ID.

So the Oculus Rift SDK accepts a framebuffer texture ID which is created with the glFramebufferTexture function.

示例:

    [...]

GLuint l_FBOId;
glGenFramebuffers(1, &l_FBOId);
glBindFramebuffer(GL_FRAMEBUFFER, l_FBOId);

// The texture we're going to render to...
GLuint l_TextureId;
glGenTextures(1, &l_TextureId);
// "Bind" the newly created texture : all future texture functions will modify this texture...
glBindTexture(GL_TEXTURE_2D, l_TextureId);
// Give an empty image to OpenGL (the last "0")
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, l_TextureSize.w, l_TextureSize.h, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
// Linear filtering...
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

// Create Depth Buffer...
GLuint l_DepthBufferId;
glGenRenderbuffers(1, &l_DepthBufferId);
glBindRenderbuffer(GL_RENDERBUFFER, l_DepthBufferId);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, l_TextureSize.w, l_TextureSize.h);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, l_DepthBufferId);

[...]

/*

Oculus Rift API

*/

ovrGLTexture l_EyeTexture[2];
l_EyeTexture[0].OGL.Header.API = ovrRenderAPI_OpenGL;
l_EyeTexture[0].OGL.Header.TextureSize.w = l_TextureSize.w;
l_EyeTexture[0].OGL.Header.TextureSize.h = l_TextureSize.h;
l_EyeTexture[0].OGL.Header.RenderViewport = l_Eyes[0].RenderViewport;
l_EyeTexture[0].OGL.TexId = l_TextureId;

[...]

但是，glFramebufferTexture函数仅在OpenGL 3.2+中可用.

However, the glFramebufferTexture function is only available in OpenGL 3.2+.

是否可以创建一种在功能上与Oculus Rift SDK等效并可以接受的解决方法?

Is it possible to create a workaround that will be functionally equivalent and acceptable to the Oculus Rift SDK?

推荐答案

使用glFramebufferTexture2D().自OpenGL 3.0引入原始帧缓冲对象(FBO)功能以来，该功能便已可用.

Use glFramebufferTexture2D(). That function has been available since OpenGL 3.0, when the original framebuffer object (FBO) functionality was introduced.

glFramebufferTexture()，用于涉及立方体贴图和纹理阵列的更高级的FBO用例.对于简单的2D纹理，它基本上等效于glFramebufferTexture2D().

glFramebufferTexture() was added later for more advanced FBO use cases involving cube maps and texture arrays. For simple 2D textures, it's mostly equivalent to glFramebufferTexture2D().

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