opengl.h: fixed gl3ext header

mitsuba-renderer / nanogui

Minimalistic C++/Python GUI library for OpenGL, GLES2/3, Metal, and WebAssembly/WebGL

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Open kallaballa opened 1 year ago

kallaballa commented 1 year ago

When NANOGUI_GLES_VERSION is set to 3 gl3ext.h should be included, not gl2ext.h. This PR fixes the inclusion.

kallaballa commented 1 year ago

Also: GL_TEXTURE_2D_MULTISAMPLE is not available in ES.