/*
 * Copyright (C) 2015-2018 Rob Clark <robclark@freedesktop.org>
 *
 * 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 IR3_CONTEXT_H_
#define IR3_CONTEXT_H_

#include "ir3_compiler.h"
#include "ir3_nir.h"
#include "ir3.h"

/* for conditionally setting boolean flag(s): */
#define COND(bool, val) ((bool) ? (val) : 0)

#define DBG(fmt, ...) \
		do { debug_printf("%s:%d: "fmt "\n", \
				__FUNCTION__, __LINE__, ##__VA_ARGS__); } while (0)

/**
 * The context for compilation of a single shader.
 */
struct ir3_context {
	struct ir3_compiler *compiler;
	const struct ir3_context_funcs *funcs;

	struct nir_shader *s;

	struct nir_instr *cur_instr;  /* current instruction, just for debug */

	struct ir3 *ir;
	struct ir3_shader_variant *so;

	struct ir3_block *block;      /* the current block */
	struct ir3_block *in_block;   /* block created for shader inputs */

	nir_function_impl *impl;

	/* For fragment shaders, varyings are not actual shader inputs,
	 * instead the hw passes a ij coord which is used with
	 * bary.f.
	 *
	 * But NIR doesn't know that, it still declares varyings as
	 * inputs.  So we do all the input tracking normally and fix
	 * things up after compile_instructions()
	 */
	struct ir3_instruction *ij_pixel, *ij_sample, *ij_centroid, *ij_size;

	/* for fragment shaders, for gl_FrontFacing and gl_FragCoord: */
	struct ir3_instruction *frag_face, *frag_coord;

	/* For vertex shaders, keep track of the system values sources */
	struct ir3_instruction *vertex_id, *basevertex, *instance_id;

	/* For fragment shaders: */
	struct ir3_instruction *samp_id, *samp_mask_in;

	/* Compute shader inputs: */
	struct ir3_instruction *local_invocation_id, *work_group_id;

	/* mapping from nir_register to defining instruction: */
	struct hash_table *def_ht;

	unsigned num_arrays;

	/* Tracking for max level of flowcontrol (branchstack) needed
	 * by a5xx+:
	 */
	unsigned stack, max_stack;

	/* a common pattern for indirect addressing is to request the
	 * same address register multiple times.  To avoid generating
	 * duplicate instruction sequences (which our backend does not
	 * try to clean up, since that should be done as the NIR stage)
	 * we cache the address value generated for a given src value:
	 *
	 * Note that we have to cache these per alignment, since same
	 * src used for an array of vec1 cannot be also used for an
	 * array of vec4.
	 */
	struct hash_table *addr_ht[4];

	/* last dst array, for indirect we need to insert a var-store.
	 */
	struct ir3_instruction **last_dst;
	unsigned last_dst_n;

	/* maps nir_block to ir3_block, mostly for the purposes of
	 * figuring out the blocks successors
	 */
	struct hash_table *block_ht;

	/* on a4xx, bitmask of samplers which need astc+srgb workaround: */
	unsigned astc_srgb;

	unsigned samples;             /* bitmask of x,y sample shifts */

	unsigned max_texture_index;

	/* set if we encounter something we can't handle yet, so we
	 * can bail cleanly and fallback to TGSI compiler f/e
	 */
	bool error;
};

struct ir3_context_funcs {
	void (*emit_intrinsic_load_ssbo)(struct ir3_context *ctx, nir_intrinsic_instr *intr,
			struct ir3_instruction **dst);
	void (*emit_intrinsic_store_ssbo)(struct ir3_context *ctx, nir_intrinsic_instr *intr);
	struct ir3_instruction * (*emit_intrinsic_atomic_ssbo)(struct ir3_context *ctx, nir_intrinsic_instr *intr);
	void (*emit_intrinsic_store_image)(struct ir3_context *ctx, nir_intrinsic_instr *intr);
	struct ir3_instruction * (*emit_intrinsic_atomic_image)(struct ir3_context *ctx, nir_intrinsic_instr *intr);
};

extern const struct ir3_context_funcs ir3_a4xx_funcs;
extern const struct ir3_context_funcs ir3_a6xx_funcs;

struct ir3_context * ir3_context_init(struct ir3_compiler *compiler,
		struct ir3_shader_variant *so);
void ir3_context_free(struct ir3_context *ctx);

struct ir3_instruction ** ir3_get_dst_ssa(struct ir3_context *ctx, nir_ssa_def *dst, unsigned n);
struct ir3_instruction ** ir3_get_dst(struct ir3_context *ctx, nir_dest *dst, unsigned n);
struct ir3_instruction * const * ir3_get_src(struct ir3_context *ctx, nir_src *src);
void ir3_put_dst(struct ir3_context *ctx, nir_dest *dst);
struct ir3_instruction * ir3_create_collect(struct ir3_context *ctx,
		struct ir3_instruction *const *arr, unsigned arrsz);
void ir3_split_dest(struct ir3_block *block, struct ir3_instruction **dst,
		struct ir3_instruction *src, unsigned base, unsigned n);

NORETURN void ir3_context_error(struct ir3_context *ctx, const char *format, ...);

#define compile_assert(ctx, cond) do { \
		if (!(cond)) ir3_context_error((ctx), "failed assert: "#cond"\n"); \
	} while (0)

struct ir3_instruction * ir3_get_addr(struct ir3_context *ctx,
		struct ir3_instruction *src, int align);
struct ir3_instruction * ir3_get_predicate(struct ir3_context *ctx,
		struct ir3_instruction *src);

void ir3_declare_array(struct ir3_context *ctx, nir_register *reg);
struct ir3_array * ir3_get_array(struct ir3_context *ctx, nir_register *reg);
struct ir3_instruction *ir3_create_array_load(struct ir3_context *ctx,
		struct ir3_array *arr, int n, struct ir3_instruction *address,
		unsigned bitsize);
void ir3_create_array_store(struct ir3_context *ctx, struct ir3_array *arr, int n,
		struct ir3_instruction *src, struct ir3_instruction *address);

static inline type_t utype_for_size(unsigned bit_size)
{
	switch (bit_size) {
	case 32: return TYPE_U32;
	case 16: return TYPE_U16;
	case  8: return TYPE_U8;
	default: unreachable("bad bitsize"); return ~0;
	}
}

static inline type_t utype_src(nir_src src)
{ return utype_for_size(nir_src_bit_size(src)); }

static inline type_t utype_dst(nir_dest dst)
{ return utype_for_size(nir_dest_bit_size(dst)); }

#endif /* IR3_CONTEXT_H_ */