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mesa/st: add PIPE_CAP_DITHERING 

this is for drivers like zink that may or may not
handle dithering and so getting blend state changes
when this state changes isn't useful

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17043>
This commit is contained in:
Mike Blumenkrantz 2020-09-23 10:06:53 -04:00 committed by Marge Bot
parent 8a9f7087a1
commit 371660b877
6 changed files with 8 additions and 1 deletions
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1
docs/gallium/screen.rst
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@ -572,6 +572,7 @@ The integer capabilities:
* ``PIPE_CAP_ATOMIC_FLOAT_MINMAX``: Atomic float point minimum,
maximum, exchange and compare-and-swap support to buffer and shared variables.
* ``PIPE_CAP_TGSI_DIV``: Whether opcode DIV is supported
* ``PIPE_CAP_DITHERING``: Whether dithering is supported
* ``PIPE_CAP_FRAGMENT_SHADER_TEXTURE_LOD``: Whether texture lookups with
explicit LOD is supported in the fragment shader.
* ``PIPE_CAP_FRAGMENT_SHADER_DERIVATIVES``: True if the driver supports

1
src/gallium/auxiliary/util/u_screen.c
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@ -49,6 +49,7 @@ u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
case PIPE_CAP_GRAPHICS:
case PIPE_CAP_GL_CLAMP:
case PIPE_CAP_MAX_RENDER_TARGETS:
case PIPE_CAP_DITHERING:
return 1;
case PIPE_CAP_OCCLUSION_QUERY:

1
src/gallium/include/pipe/p_defines.h
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@ -1010,6 +1010,7 @@ enum pipe_cap
PIPE_CAP_ALLOW_DRAW_OUT_OF_ORDER,
PIPE_CAP_MAX_CONSTANT_BUFFER_SIZE_UINT,
PIPE_CAP_HARDWARE_GL_SELECT,
PIPE_CAP_DITHERING,
PIPE_CAP_LAST,
/* XXX do not add caps after PIPE_CAP_LAST! */

3
src/mesa/state_tracker/st_atom_blend.c
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@ -283,7 +283,8 @@ st_update_blend( struct st_context *st )
/* no blending / logicop */
}
blend->dither = ctx->Color.DitherFlag;
if (st->can_dither)
blend->dither = ctx->Color.DitherFlag;
if (_mesa_is_multisample_enabled(ctx) &&
!(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {

2
src/mesa/state_tracker/st_context.c
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@ -613,6 +613,8 @@ st_create_context_priv(struct gl_context *ctx, struct pipe_context *pipe,
screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC);
st->needs_rgb_dst_alpha_override =
screen->get_param(screen, PIPE_CAP_RGB_OVERRIDE_DST_ALPHA_BLEND);
st->can_dither =
screen->get_param(screen, PIPE_CAP_DITHERING);
st->lower_flatshade =
!screen->get_param(screen, PIPE_CAP_FLATSHADE);
st->lower_alpha_test =

1
src/mesa/state_tracker/st_context.h
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@ -153,6 +153,7 @@ struct st_context
boolean has_single_pipe_stat;
boolean has_indep_blend_func;
boolean needs_rgb_dst_alpha_override;
boolean can_dither;
boolean can_bind_const_buffer_as_vertex;
boolean lower_flatshade;
boolean lower_alpha_test;