OpenGL 的glDisable(GL_TEXTURE_2D)函数和glBindTexture(GL_TEXTURE_2D,0)有什么区别？

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OpenGL 的glDisable(GL_TEXTURE_2D)函数和glBindTexture(GL_TEXTURE_2D,0)有什么区别？


OpenGL glDisable(GL_TEXTURE_2D) vs glBindTexture(GL_TEXTURE_2D,0)

These are two fundamentally different things.


glDisable(GL_TEXTURE_2D);

glBindTexture(GL_TEXTURE_2D,0)

glDisable (GL_TEXTURE_2D)

  • Disables 2D textures for the active Texture Unit in the fixed-function OpenGL pipeline.
  • In programmable OpenGL (GLSL or the older ARB VP/FP assembly languages), enabling or disabling GL_TEXTURE_2D is meaningless.

glBindTexture (GL_TEXTURE_2D,0)

  • Binds the "default" texture to the active Texture Image Unit.
  • For all intents and purposes, there is always a texture bound to a Texture Image Unit; 0 is just a special-case with an initially incomplete set of states, thus complicating validation (see below).

There is a little bit of validation overhead associated with binding any OpenGL resource (GLSL programs and FBOs tend to have the most complicated validation). In general, changing an object binding tends to be more expensive than changing one or two states associated with a bound object.

Therefore, unnecessarily changing the bound texture is inadvisable.

If your intention by binding 0 was simply to "disable" a texture, you would be better off setting a uniform value to communicate this intent to a shader. Uniforms are extremely cheap to set (assuming you do not do something stupid like query their location everytime you set them). Changing a uniform is orders of magnitude quicker than binding a different texture or even worse a different GLSL program.


If you are using fixed-function OpenGL: OpenGL1.0

  • Disabling GL_TEXTURE_2D is a better way of approaching this problem.
  • Changing bound objects should be done as little as possible.

If you are using programmable OpenGL: OpenGL2.0

  • Neither of these things make much sense.
  • Work your desired behavior into your shaders.

https://gamedev.stackexchange.com/questions/74583/opengl-gldisablegl-texture-2d-vs-glbindtexturegl-texture-2d-0/74584

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glBindTexture是OpenGL核心函数库中的一个函数。函数说明：允许建立一个绑定到目标纹理的有名称的纹理。例如，一幅具有真实感的图像或者照片作为纹理贴到一个矩形上，就可以在定义纹理对象生成纹理对象数组后，通过使用glBindTexture选择纹理对象，来完成该纹理对象的定义。 转载于:https://www.cnblogs.com/yujunyong/archive/2011/04/16...
GLES2.0中文API-glBindTexture
flycatdeng的专栏
09-16 2961
名称 glBindTexture- 将一个指定的纹理ID绑定到一个纹理目标上 C规范   void glBindTexture(GLenum target, GLuint texture); 参数 target     指定之前激活了的纹理要绑定到的一个目标。必须是GL_TEXTURE_2D 或GL_TEXTURE_CUBE_MAP。 texture     指定纹理ID。 描...
OpenGL ES TEXTURE_2D
明明像笨蛋的博客
08-18 2946
1、Draw.java 新增画矩形方法 /* * 绘制矩形 */ public static void drawRect(GL10 gl ,float []pos){ gl.glVertexPointer(3, GL10.GL_FLOAT, 0, BufferUtil.arr2ByteBuffer(pos)); gl.glDrawArrays(GL10.GL_TRIANGLE_
openGL之API学习（四十三）glBindTexture
hankern的专栏
04-10 1486
决定使用哪个纹理对象。 void glBindTexture( GLenum target, GLuint texture); target Specifies the target to which the texture is bound. Must be one of GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, ...
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