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panfrost: Implement gl_FrontFacing

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Interestingly, this requires no compiler changes. It's just exposed as a
special varying.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-07-31 12:24:32 -07:00
parent f3e15122d4
commit e913986868
4 changed files with 27 additions and 0 deletions
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6
src/gallium/drivers/panfrost/pan_assemble.c
View file

@ -144,6 +144,12 @@ panfrost_shader_compile(struct panfrost_context *ctx, struct mali_shader_meta *m
v.swizzle = default_vec2_swizzle;
state->reads_point_coord = true;
} else if (location == VARYING_SLOT_FACE) {
v.index = 4;
v.format = MALI_R32I;
v.swizzle = default_vec1_swizzle;
state->reads_face = true;
} else {
v.index = 0;
}

15
src/gallium/drivers/panfrost/pan_context.c
View file

@ -516,6 +516,12 @@ panfrost_emit_point_coord(union mali_attr *slot)
slot->stride = slot->size = slot->shift = slot->extra_flags = 0;
}
static void
panfrost_emit_front_face(union mali_attr *slot)
{
slot->elements = MALI_VARYING_FRONT_FACING | MALI_ATTR_INTERNAL;
}
static void
panfrost_emit_varying_descriptor(
struct panfrost_context *ctx,
@ -618,11 +624,20 @@ panfrost_emit_varying_descriptor(
ctx->payload_tiler.primitive_size.pointer =
panfrost_emit_varyings(ctx, &varyings[idx++],
2, vertex_count);
} else if (fs->reads_face) {
/* Dummy to advance index */
++idx;
}
if (fs->reads_point_coord) {
/* Special descriptor */
panfrost_emit_point_coord(&varyings[idx++]);
} else if (fs->reads_face) {
++idx;
}
if (fs->reads_face) {
panfrost_emit_front_face(&varyings[idx++]);
}
mali_ptr varyings_p = panfrost_upload_transient(ctx, &varyings, idx * sizeof(union mali_attr));

1
src/gallium/drivers/panfrost/pan_context.h
View file

@ -218,6 +218,7 @@ struct panfrost_shader_state {
bool can_discard;
bool writes_point_size;
bool reads_point_coord;
bool reads_face;
struct mali_attr_meta varyings[PIPE_MAX_ATTRIBS];
gl_varying_slot varyings_loc[PIPE_MAX_ATTRIBS];

5
src/gallium/drivers/panfrost/pan_screen.c
View file

@ -168,6 +168,11 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
case PIPE_CAP_GENERATE_MIPMAP:
return 1;
/* We would prefer varyings */
case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
return 0;
case PIPE_CAP_SEAMLESS_CUBE_MAP:
case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
return 1;