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MESA_GLX_ALPHA_BITS env var to force visual with alpha channel

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This commit is contained in:
Brian Paul 2005-11-04 16:41:06 +00:00
parent f805cdfedf
commit c12ee99d11
1 changed files with 19 additions and 2 deletions
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21
src/mesa/drivers/x11/fakeglx.c
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@ -378,6 +378,18 @@ default_depth_bits(void)
return zBits;
}
static GLint
default_alpha_bits(void)
{
int aBits;
const char *aEnv = _mesa_getenv("MESA_GLX_ALPHA_BITS");
if (aEnv)
aBits = _mesa_atoi(aEnv);
else
aBits = 0;
return aBits;
}
static GLint
default_accum_bits(void)
{
@ -400,6 +412,7 @@ create_glx_visual( Display *dpy, XVisualInfo *visinfo )
int vislevel;
GLint zBits = default_depth_bits();
GLint accBits = default_accum_bits();
GLboolean alphaFlag = default_alpha_bits() > 0;
vislevel = level_of_visual( dpy, visinfo );
if (vislevel) {
@ -437,7 +450,7 @@ create_glx_visual( Display *dpy, XVisualInfo *visinfo )
/* can be done? They should use glXChooseVisual(). */
return save_glx_visual( dpy, visinfo,
GL_TRUE, /* rgb */
GL_FALSE, /* alpha */
alphaFlag, /* alpha */
GL_TRUE, /* double */
GL_FALSE, /* stereo */
zBits,
@ -1013,7 +1026,7 @@ choose_visual( Display *dpy, int screen, const int *list, GLboolean fbConfig )
parselist++;
{
GLint size = *parselist++;
alpha_flag = size>0 ? 1 : 0;
alpha_flag = size ? GL_TRUE : GL_FALSE;
}
break;
case GLX_DEPTH_SIZE:
@ -1223,6 +1236,10 @@ choose_visual( Display *dpy, int screen, const int *list, GLboolean fbConfig )
depth_size = default_depth_bits();
}
if (!alpha_flag) {
alpha_flag = default_alpha_bits() > 0;
}
/* we only support one size of stencil and accum buffers. */
if (stencil_size > 0)
stencil_size = STENCIL_BITS;