/*
 * Copyright (C) 2016 Rob Clark <robclark@freedesktop.org>
 * Copyright © 2018 Google, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Authors:
 *    Rob Clark <robclark@freedesktop.org>
 */

#ifndef FD6_BLEND_H_
#define FD6_BLEND_H_

#include "pipe/p_state.h"
#include "pipe/p_context.h"

#include "freedreno_context.h"
#include "freedreno_util.h"

/**
 * Since the sample-mask is part of the hw blend state, we need to have state
 * variants per sample-mask value.  But we don't expect the sample-mask state
 * to change frequently.
 */
struct fd6_blend_variant {
	unsigned sample_mask;
	struct fd_ringbuffer *stateobj;
};

struct fd6_blend_stateobj {
	struct pipe_blend_state base;

	struct fd_context *ctx;
	bool reads_dest;
	struct util_dynarray variants;
};

static inline struct fd6_blend_stateobj *
fd6_blend_stateobj(struct pipe_blend_state *blend)
{
	return (struct fd6_blend_stateobj *)blend;
}

struct fd6_blend_variant * __fd6_setup_blend_variant(
		struct fd6_blend_stateobj *blend, unsigned sample_mask);

static inline struct fd6_blend_variant *
fd6_blend_variant(struct pipe_blend_state *cso,
		unsigned nr_samples, unsigned sample_mask)
{
	struct fd6_blend_stateobj *blend = fd6_blend_stateobj(cso);
	unsigned mask = BITFIELD_MASK(nr_samples);

	util_dynarray_foreach(&blend->variants, struct fd6_blend_variant *, vp) {
		struct fd6_blend_variant *v = *vp;

		/* mask out sample-mask bits that we don't care about to avoid
		 * creating unnecessary variants
		 */
		if ((mask & v->sample_mask) == (mask & sample_mask)) {
			return v;
		}
	}

	return __fd6_setup_blend_variant(blend, sample_mask);
}

void * fd6_blend_state_create(struct pipe_context *pctx,
		const struct pipe_blend_state *cso);
void fd6_blend_state_delete(struct pipe_context *, void *hwcso);

#endif /* FD6_BLEND_H_ */
