/*
 * Copyright 2009 Corbin Simpson <MostAwesomeDude@gmail.com>
 * SPDX-License-Identifier: MIT
 */

#include "util/u_memory.h"
#include "util/os_time.h"

#include "r300_context.h"
#include "r300_screen.h"
#include "r300_emit.h"

#include <stdio.h>

static struct pipe_query *r300_create_query(struct pipe_context *pipe,
                                            unsigned query_type,
                                            unsigned index)
{
    struct r300_context *r300 = r300_context(pipe);
    struct r300_screen *r300screen = r300->screen;
    struct r300_query *q;

    if (query_type != PIPE_QUERY_OCCLUSION_COUNTER &&
        query_type != PIPE_QUERY_OCCLUSION_PREDICATE &&
        query_type != PIPE_QUERY_OCCLUSION_PREDICATE_CONSERVATIVE &&
        query_type != PIPE_QUERY_GPU_FINISHED) {
        return NULL;
    }

    q = CALLOC_STRUCT(r300_query);
    if (!q)
        return NULL;

    q->type = query_type;

    if (query_type == PIPE_QUERY_GPU_FINISHED) {
        return (struct pipe_query*)q;
    }

    if (r300screen->caps.family == CHIP_RV530)
        q->num_pipes = r300screen->info.r300_num_z_pipes;
    else
        q->num_pipes = r300screen->info.r300_num_gb_pipes;

    q->buf = r300->rws->buffer_create(r300->rws,
                                      r300screen->info.gart_page_size,
                                      r300screen->info.gart_page_size,
                                      RADEON_DOMAIN_GTT,
                                      RADEON_FLAG_NO_INTERPROCESS_SHARING);
    if (!q->buf) {
        FREE(q);
        return NULL;
    }
    return (struct pipe_query*)q;
}

static void r300_destroy_query(struct pipe_context* pipe,
                               struct pipe_query* query)
{
    struct r300_context *r300 = r300_context(pipe);
    struct r300_query* q = r300_query(query);

    radeon_bo_reference(r300->rws, &q->buf, NULL);
    FREE(query);
}

void r300_resume_query(struct r300_context *r300,
                       struct r300_query *query)
{
    r300->query_current = query;
    r300_mark_atom_dirty(r300, &r300->query_start);
}

static bool r300_begin_query(struct pipe_context* pipe,
                             struct pipe_query* query)
{
    struct r300_context* r300 = r300_context(pipe);
    struct r300_query* q = r300_query(query);

    if (q->type == PIPE_QUERY_GPU_FINISHED)
        return true;

    if (r300->query_current != NULL) {
        fprintf(stderr, "r300: begin_query: "
                "Some other query has already been started.\n");
        assert(0);
        return false;
    }

    q->num_results = 0;
    r300_resume_query(r300, q);
    return true;
}

void r300_stop_query(struct r300_context *r300)
{
    r300_emit_query_end(r300);
    r300->query_current = NULL;
}

static bool r300_end_query(struct pipe_context* pipe,
	                   struct pipe_query* query)
{
    struct r300_context* r300 = r300_context(pipe);
    struct r300_query *q = r300_query(query);

    if (q->type == PIPE_QUERY_GPU_FINISHED) {
        radeon_bo_reference(r300->rws, &q->buf, NULL);
        r300_flush(pipe, PIPE_FLUSH_ASYNC,
                   (struct pipe_fence_handle**)&q->buf);
        return true;
    }

    if (q != r300->query_current) {
        fprintf(stderr, "r300: end_query: Got invalid query.\n");
        assert(0);
        return false;
    }

    r300_stop_query(r300);

    return true;
}

static bool r300_get_query_result(struct pipe_context* pipe,
                                  struct pipe_query* query,
                                  bool wait,
                                  union pipe_query_result *vresult)
{
    struct r300_context* r300 = r300_context(pipe);
    struct r300_query *q = r300_query(query);
    unsigned i;
    uint32_t temp, *map;

    if (q->type == PIPE_QUERY_GPU_FINISHED) {
        if (wait) {
            r300->rws->buffer_wait(r300->rws, q->buf, OS_TIMEOUT_INFINITE,
                                   RADEON_USAGE_READWRITE);
            vresult->b = true;
        } else {
            vresult->b = r300->rws->buffer_wait(r300->rws, q->buf, 0, RADEON_USAGE_READWRITE);
        }
        return vresult->b;
    }

    if (q->num_results == 0) {
        if (wait) {
            struct pipe_fence_handle *fence = NULL;

            r300_flush(pipe, PIPE_FLUSH_ASYNC, &fence);
            if (fence) {
                pipe->screen->fence_finish(pipe->screen, pipe, fence,
                                           OS_TIMEOUT_INFINITE);
                pipe->screen->fence_reference(pipe->screen, &fence, NULL);
            }
        }

        if (q->type == PIPE_QUERY_OCCLUSION_PREDICATE ||
            q->type == PIPE_QUERY_OCCLUSION_PREDICATE_CONSERVATIVE) {
            vresult->b = false;
        } else {
            vresult->u64 = 0;
        }
        return true;
    }

    map = r300->rws->buffer_map(r300->rws, q->buf, &r300->cs,
                                PIPE_MAP_READ |
                                (!wait ? PIPE_MAP_DONTBLOCK : 0));
    if (!map)
        return false;

    /* Sum up the results. */
    temp = 0;
    for (i = 0; i < q->num_results; i++) {
        /* Convert little endian values written by GPU to CPU byte order */
        temp += util_le32_to_cpu(*map);
        map++;
    }

    if (q->type == PIPE_QUERY_OCCLUSION_PREDICATE ||
        q->type == PIPE_QUERY_OCCLUSION_PREDICATE_CONSERVATIVE) {
        vresult->b = temp != 0;
    } else {
        vresult->u64 = temp;
    }
    return true;
}

static void r300_render_condition(struct pipe_context *pipe,
                                  struct pipe_query *query,
                                  bool condition,
                                  enum pipe_render_cond_flag mode)
{
    struct r300_context *r300 = r300_context(pipe);
    union pipe_query_result result;
    bool wait;

    r300->skip_rendering = false;

    if (query) {
        wait = mode == PIPE_RENDER_COND_WAIT ||
               mode == PIPE_RENDER_COND_BY_REGION_WAIT;

        if (r300_get_query_result(pipe, query, wait, &result)) {
            if (r300_query(query)->type == PIPE_QUERY_OCCLUSION_PREDICATE ||
                r300_query(query)->type == PIPE_QUERY_OCCLUSION_PREDICATE_CONSERVATIVE) {
                r300->skip_rendering = condition == result.b;
            } else {
                r300->skip_rendering = condition == !!result.u64;
            }
        }
    }
}

static void
r300_set_active_query_state(struct pipe_context *pipe, bool enable)
{
    struct r300_context *r300 = r300_context(pipe);

    if (enable) {
        if (r300->blitter_saved_query && !r300->query_current) {
            r300_resume_query(r300, r300->blitter_saved_query);
            r300->blitter_saved_query = NULL;
        }
    } else {
        if (r300->query_current && !r300->blitter_saved_query) {
            r300->blitter_saved_query = r300->query_current;
            r300_stop_query(r300);
        }
    }
}

void r300_init_query_functions(struct r300_context* r300)
{
    r300->context.create_query = r300_create_query;
    r300->context.destroy_query = r300_destroy_query;
    r300->context.begin_query = r300_begin_query;
    r300->context.end_query = r300_end_query;
    r300->context.get_query_result = r300_get_query_result;
    r300->context.set_active_query_state = r300_set_active_query_state;
    r300->context.render_condition = r300_render_condition;
}
