Why doesn't mac opengl support alpha textures?

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Created 5d

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I have used the Mac M1 and M4. Developing OpenGL projects on machines running macOS 15.2 and 13.6. Call the OpenGL library functions of Mac. glTexImage2D If you use GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_ALPHA these three textures, you will get an error gl 500. It makes me unable to draw normally on Mac. What's the reason for this? Don't they support it?

Answered by Graphics and Games Engineer in 822349022

Can you show how you are creating your context? Keep in mind that, as documented, the legacy profile for OpenGL on macOS only supports the exact feature set that was available prior to macOS 10.7. You cannot create an OpenGl 3.2 or later compatibility context on macOS.

For what it’s worth, GL_LUMINANCE, GL_ALPHA, and GL_LUMINANCE_ALPHA were deprecated in OpenGL 3.0. If you are using a shader-based pipeline, you can directly replace these with GL_RED and GL_RG .

Finally, please don’t use OpenGL for new applications on Apple platforms. OpenGL has been deprecated since macOS 10.14. Please use Metal instead.

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Answer 1

Graphics and Games Engineer OP

Apple

4d

GL_ALPHA, GL_LUMINANCE, and GL_LUMINANCE_ALPHA are only present in the Compatibility profile. Are you creating a Compatibility context or a Core context?

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Answer 2

Graphics and Games Engineer OP

Apple

3d

Recommended

Can you show how you are creating your context? Keep in mind that, as documented, the legacy profile for OpenGL on macOS only supports the exact feature set that was available prior to macOS 10.7. You cannot create an OpenGl 3.2 or later compatibility context on macOS.

For what it’s worth, GL_LUMINANCE, GL_ALPHA, and GL_LUMINANCE_ALPHA were deprecated in OpenGL 3.0. If you are using a shader-based pipeline, you can directly replace these with GL_RED and GL_RG .

Finally, please don’t use OpenGL for new applications on Apple platforms. OpenGL has been deprecated since macOS 10.14. Please use Metal instead.

0