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Restore OpenGL 1.1 support (GL_CLAMP)

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GL_CLAMP (clamp to border) was changed to GL_CLAMP_TO_EDGE in 2008
(f2baf359). In 2018 (ce1d5406) I made OpenGL 1.2 be required since
GL_CLAMP_TO_EDGE is used.

Restore support for GL_CLAMP in order to support OpenGL 1.1 like vanilla
Quake 3 does. This should allow using the default Microsoft Windows
GDI Generic OpenGL 1.1 driver (untested but it won't fail the version
check at least).

From gpuinfo.org, it looks like drivers stopped advertising support for
GL_SGIS_texture_edge_clamp so use a version check in addition to the
extension check.

r_allowExtensions 0 disables using GL_CLAMP_TO_EDGE in the opengl1
renderer. GL_CLAMP support wasn't added to the opengl2 renderer.
This commit is contained in:
Zack Middleton 2019-05-28 22:44:57 -05:00
parent 0fbde293db
commit 350b8f9c7c
6 changed files with 21 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

2
code/renderergl2/tr_init.c
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@ -30,6 +30,7 @@ glRefConfig_t glRefConfig;
qboolean textureFilterAnisotropic = qfalse;
int maxAnisotropy = 0;
float displayAspect = 0.0f;
qboolean haveClampToEdge = qfalse;
glstate_t glState;
@ -1552,6 +1553,7 @@ void RE_Shutdown( qboolean destroyWindow ) {
textureFilterAnisotropic = qfalse;
maxAnisotropy = 0;
displayAspect = 0.0f;
haveClampToEdge = qfalse;
Com_Memset( &glState, 0, sizeof( glState ) );
}