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gl: Fail if GL implementation doesn't support shaders

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The non-shaders implementation was never tuned for fixed-function GL
implementation, the maintainers are not interested in supporting it,
and the hardware is rather rare at this point.  This lets us focus on
the implementation for modern hardware, which needs plenty of work
still.

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Alexandros Frantzis 2011-01-28 15:02:52 +02:00 • committed by Eric Anholt
parent 0e08e7adfc
commit 037c9ba7e2
1 changed files with 6 additions and 0 deletions
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6
src/cairo-gl-shaders.c
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@ -359,9 +359,15 @@ _cairo_gl_context_init_shaders (cairo_gl_context_t *ctx)
(_cairo_gl_has_extension ("GL_ARB_shader_objects") &&
_cairo_gl_has_extension ("GL_ARB_fragment_shader") &&
_cairo_gl_has_extension ("GL_ARB_vertex_shader")))
{
ctx->shader_impl = &shader_impl_core_2_0;
}
else
{
ctx->shader_impl = NULL;
fprintf (stderr, "Error: The cairo gl backend requires shader support!\n");
return CAIRO_STATUS_DEVICE_ERROR;
}
memset (ctx->vertex_shaders, 0, sizeof (ctx->vertex_shaders));