path: root/src/gallium/drivers/r300/r300_blit.c

/*
 * Copyright 2009 Marek Olšák <maraeo@gmail.com>
 *
 * 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
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS 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. */

#include "r300_context.h"
#include "r300_texture.h"

#include "util/u_format.h"
#include "util/u_pack_color.h"

enum r300_blitter_op /* bitmask */
{
    R300_CLEAR         = 1,
    R300_CLEAR_SURFACE = 2,
    R300_COPY          = 4
};

static void r300_blitter_begin(struct r300_context* r300, enum r300_blitter_op op)
{
    if (r300->query_current) {
        r300->blitter_saved_query = r300->query_current;
        r300_stop_query(r300);
    }

    /* Yeah we have to save all those states to ensure the blitter operation
     * is really transparent. The states will be restored by the blitter once
     * copying is done. */
    util_blitter_save_blend(r300->blitter, r300->blend_state.state);
    util_blitter_save_depth_stencil_alpha(r300->blitter, r300->dsa_state.state);
    util_blitter_save_stencil_ref(r300->blitter, &(r300->stencil_ref));
    util_blitter_save_rasterizer(r300->blitter, r300->rs_state.state);
    util_blitter_save_fragment_shader(r300->blitter, r300->fs.state);
    util_blitter_save_vertex_shader(r300->blitter, r300->vs_state.state);
    util_blitter_save_viewport(r300->blitter, &r300->viewport);
    util_blitter_save_clip(r300->blitter, (struct pipe_clip_state*)r300->clip_state.state);
    util_blitter_save_vertex_elements(r300->blitter, r300->velems);
    util_blitter_save_vertex_buffers(r300->blitter, r300->vertex_buffer_count,
                                     r300->vertex_buffer);

    if (op & (R300_CLEAR_SURFACE | R300_COPY))
        util_blitter_save_framebuffer(r300->blitter, r300->fb_state.state);

    if (op & R300_COPY) {
        struct r300_textures_state* state =
            (struct r300_textures_state*)r300->textures_state.state;

        util_blitter_save_fragment_sampler_states(
            r300->blitter, state->sampler_state_count,
            (void**)state->sampler_states);

        util_blitter_save_fragment_sampler_views(
            r300->blitter, state->sampler_view_count,
            (struct pipe_sampler_view**)state->sampler_views);
    }
}

static void r300_blitter_end(struct r300_context *r300)
{
    if (r300->blitter_saved_query) {
        r300_resume_query(r300, r300->blitter_saved_query);
        r300->blitter_saved_query = NULL;
    }
}

static uint32_t r300_depth_clear_cb_value(enum pipe_format format,
					  const float* rgba)
{
    union util_color uc;
    util_pack_color(rgba, format, &uc);

    if (util_format_get_blocksizebits(format) == 32)
        return uc.ui;
    else
        return uc.us | (uc.us << 16);
}

static boolean r300_cbzb_clear_allowed(struct r300_context *r300,
                                       unsigned clear_buffers)
{
    struct pipe_framebuffer_state *fb =
        (struct pipe_framebuffer_state*)r300->fb_state.state;
    struct r300_surface *surf = r300_surface(fb->cbufs[0]);
    unsigned bpp;

    /* Only color clear allowed, and only one colorbuffer. */
    if (clear_buffers != PIPE_CLEAR_COLOR || fb->nr_cbufs != 1)
        return FALSE;

    /* The colorbuffer must be point-sampled. */
    if (surf->base.texture->nr_samples > 1)
        return FALSE;

    bpp = util_format_get_blocksizebits(surf->base.format);

    /* ZB can only work with the two pixel sizes. */
    if (bpp != 16 && bpp != 32)
        return FALSE;

    /* If the midpoint ZB offset is not aligned to 2048, it returns garbage
     * with certain texture sizes. Macrotiling ensures the alignment. */
    if (!r300_texture(surf->base.texture)->mip_macrotile[surf->base.level])
        return FALSE;

    return TRUE;
}

/* Clear currently bound buffers. */
static void r300_clear(struct pipe_context* pipe,
                       unsigned buffers,
                       const float* rgba,
                       double depth,
                       unsigned stencil)
{
    /* My notes about fastfill:
     *
     * 1) Only the zbuffer is cleared.
     *
     * 2) The zbuffer must be micro-tiled and whole microtiles must be
     *    written. If microtiling is disabled, it locks up.
     *
     * 3) There is Z Mask RAM which contains a compressed zbuffer and
     *    it interacts with fastfill. We should figure out how to use it
     *    to get more performance.
     *    This is what we know about the Z Mask:
     *
     *       Each dword of the Z Mask contains compression information
     *       for 16 4x4 pixel blocks, that is 2 bits for each block.
     *       On chips with 2 Z pipes, every other dword maps to a different
     *       pipe.
     *
     * 4) ZB_DEPTHCLEARVALUE is used to clear the zbuffer and the Z Mask must
     *    be equal to 0. (clear the Z Mask RAM with zeros)
     *
     * 5) For 16-bit zbuffer, compression causes a hung with one or
     *    two samples and should not be used.
     *
     * 6) FORCE_COMPRESSED_STENCIL_VALUE should be enabled for stencil clears
     *    to avoid needless decompression.
     *
     * 7) Fastfill must not be used if reading of compressed Z data is disabled
     *    and writing of compressed Z data is enabled (RD/WR_COMP_ENABLE),
     *    i.e. it cannot be used to compress the zbuffer.
     *
     * 8) ZB_CB_CLEAR does not interact with fastfill in any way.
     *
     * - Marek
     */

    struct r300_context* r300 = r300_context(pipe);
    struct pipe_framebuffer_state *fb =
        (struct pipe_framebuffer_state*)r300->fb_state.state;
    struct r300_hyperz_state *hyperz =
        (struct r300_hyperz_state*)r300->hyperz_state.state;
    uint32_t width = fb->width;
    uint32_t height = fb->height;

    /* Enable CBZB clear. */
    if (r300_cbzb_clear_allowed(r300, buffers)) {
        struct r300_surface *surf = r300_surface(fb->cbufs[0]);

        hyperz->zb_depthclearvalue =
                r300_depth_clear_cb_value(surf->base.format, rgba);

        width = surf->cbzb_width;
        height = surf->cbzb_height;

        r300->cbzb_clear = TRUE;
        r300_mark_fb_state_dirty(r300, R300_CHANGED_CBZB_FLAG);
    }

    /* Clear. */
    r300_blitter_begin(r300, R300_CLEAR);
    util_blitter_clear(r300->blitter,
                       width,
                       height,
                       fb->nr_cbufs,
                       buffers, rgba, depth, stencil);
    r300_blitter_end(r300);

    /* Disable CBZB clear. */
    if (r300->cbzb_clear) {
        r300->cbzb_clear = FALSE;
        r300_mark_fb_state_dirty(r300, R300_CHANGED_CBZB_FLAG);
    }

    /* XXX this flush "fixes" a hardlock in the cubestorm xscreensaver */
    if (r300->flush_counter == 0)
        pipe->flush(pipe, 0, NULL);
}

/* Clear a region of a color surface to a constant value. */
static void r300_clear_render_target(struct pipe_context *pipe,
                                     struct pipe_surface *dst,
                                     const float *rgba,
                                     unsigned dstx, unsigned dsty,
                                     unsigned width, unsigned height)
{
    struct r300_context *r300 = r300_context(pipe);

    r300_blitter_begin(r300, R300_CLEAR_SURFACE);
    util_blitter_clear_render_target(r300->blitter, dst, rgba,
                                     dstx, dsty, width, height);
    r300_blitter_end(r300);
}

/* Clear a region of a depth stencil surface. */
static void r300_clear_depth_stencil(struct pipe_context *pipe,
                                     struct pipe_surface *dst,
                                     unsigned clear_flags,
                                     double depth,
                                     unsigned stencil,
                                     unsigned dstx, unsigned dsty,
                                     unsigned width, unsigned height)
{
    struct r300_context *r300 = r300_context(pipe);

    r300_blitter_begin(r300, R300_CLEAR_SURFACE);
    util_blitter_clear_depth_stencil(r300->blitter, dst, clear_flags, depth, stencil,
                                     dstx, dsty, width, height);
    r300_blitter_end(r300);
}

/* Copy a block of pixels from one surface to another using HW. */
static void r300_hw_copy_region(struct pipe_context* pipe,
                                struct pipe_resource *dst,
                                struct pipe_subresource subdst,
                                unsigned dstx, unsigned dsty, unsigned dstz,
                                struct pipe_resource *src,
                                struct pipe_subresource subsrc,
                                unsigned srcx, unsigned srcy, unsigned srcz,
                                unsigned width, unsigned height)
{
    struct r300_context* r300 = r300_context(pipe);

    r300_blitter_begin(r300, R300_COPY);
    util_blitter_copy_region(r300->blitter, dst, subdst, dstx, dsty, dstz,
                             src, subsrc, srcx, srcy, srcz, width, height,
                             TRUE);
    r300_blitter_end(r300);
}

/* Copy a block of pixels from one surface to another. */
static void r300_resource_copy_region(struct pipe_context *pipe,
                                      struct pipe_resource *dst,
                                      struct pipe_subresource subdst,
                                      unsigned dstx, unsigned dsty, unsigned dstz,
                                      struct pipe_resource *src,
                                      struct pipe_subresource subsrc,
                                      unsigned srcx, unsigned srcy, unsigned srcz,
                                      unsigned width, unsigned height)
{
    enum pipe_format old_format = dst->format;
    enum pipe_format new_format = old_format;

    if (!pipe->screen->is_format_supported(pipe->screen,
                                           old_format, src->target,
                                           src->nr_samples,
                                           PIPE_BIND_RENDER_TARGET |
                                           PIPE_BIND_SAMPLER_VIEW, 0) &&
        util_format_is_plain(old_format)) {
        switch (util_format_get_blocksize(old_format)) {
            case 1:
                new_format = PIPE_FORMAT_I8_UNORM;
                break;
            case 2:
                new_format = PIPE_FORMAT_B4G4R4A4_UNORM;
                break;
            case 4:
                new_format = PIPE_FORMAT_B8G8R8A8_UNORM;
                break;
            case 8:
                new_format = PIPE_FORMAT_R16G16B16A16_UNORM;
                break;
            default:
                debug_printf("r300: surface_copy: Unhandled format: %s. Falling back to software.\n"
                             "r300: surface_copy: Software fallback doesn't work for tiled textures.\n",
                             util_format_short_name(old_format));
        }
    }

    if (old_format != new_format) {
        dst->format = new_format;
        src->format = new_format;

        r300_texture_reinterpret_format(pipe->screen,
                                        dst, new_format);
        r300_texture_reinterpret_format(pipe->screen,
                                        src, new_format);
    }

    r300_hw_copy_region(pipe, dst, subdst, dstx, dsty, dstz,
                        src, subsrc, srcx, srcy, srcz, width, height);

    if (old_format != new_format) {
        dst->format = old_format;
        src->format = old_format;

        r300_texture_reinterpret_format(pipe->screen,
                                        dst, old_format);
        r300_texture_reinterpret_format(pipe->screen,
                                        src, old_format);
    }
}

void r300_init_blit_functions(struct r300_context *r300)
{
    r300->context.clear = r300_clear;
    r300->context.clear_render_target = r300_clear_render_target;
    r300->context.clear_depth_stencil = r300_clear_depth_stencil;
    r300->context.resource_copy_region = r300_resource_copy_region;
}