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/**************************************************************************

 *

 * Copyright 2003 VMware, Inc.

 * All Rights Reserved.

 *

 * 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, 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 VMWARE AND/OR ITS 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 "i915_surface.h"

#include "i915_resource.h"

#include "i915_state.h"

#include "i915_blit.h"

#include "i915_reg.h"

#include "i915_screen.h"

#include "pipe/p_defines.h"

#include "util/u_inlines.h"

#include "util/u_math.h"

#include "util/u_format.h"

#include "util/u_memory.h"

#include "util/u_pack_color.h"

#include "util/u_surface.h"

static struct pipe_surface *

i915_create_surface_custom(struct pipe_context *ctx,

                           struct pipe_resource *pt,

                           const struct pipe_surface *surf_tmpl,

                           unsigned width0,

                           unsigned height0);

/*

 * surface functions using the render engine

 */

static void

i915_util_blitter_save_states(struct i915_context *i915)

{

   util_blitter_save_blend(i915->blitter, (void *)i915->blend);

   util_blitter_save_depth_stencil_alpha(i915->blitter, (void *)i915->depth_stencil);

   util_blitter_save_stencil_ref(i915->blitter, &i915->stencil_ref);

   util_blitter_save_rasterizer(i915->blitter, (void *)i915->rasterizer);

   util_blitter_save_fragment_shader(i915->blitter, i915->fs);

   util_blitter_save_vertex_shader(i915->blitter, i915->vs);

   util_blitter_save_viewport(i915->blitter, &i915->viewport);

   util_blitter_save_scissor(i915->blitter, &i915->scissor);

   util_blitter_save_vertex_elements(i915->blitter, i915->velems);

   util_blitter_save_vertex_buffer_slot(i915->blitter,

                                    i915->vertex_buffers);

   util_blitter_save_framebuffer(i915->blitter, &i915->framebuffer);

   util_blitter_save_fragment_sampler_states(i915->blitter,

                                             i915->num_samplers,

                                             (void**)i915->fragment_sampler);

   util_blitter_save_fragment_sampler_views(i915->blitter,

                                            i915->num_fragment_sampler_views,

                                            i915->fragment_sampler_views);

}

static void

i915_surface_copy_render(struct pipe_context *pipe,

                         struct pipe_resource *dst, unsigned dst_level,

                         unsigned dstx, unsigned dsty, unsigned dstz,

                         struct pipe_resource *src, unsigned src_level,

                         const struct pipe_box *src_box)

{

   struct i915_context *i915 = i915_context(pipe);

   unsigned src_width0 = src->width0;

   unsigned src_height0 = src->height0;

   unsigned dst_width0 = dst->width0;

   unsigned dst_height0 = dst->height0;

   struct pipe_box dstbox;

   struct pipe_sampler_view src_templ, *src_view;

   struct pipe_surface dst_templ, *dst_view;

   const struct util_format_description *desc;

   /* Fallback for buffers. */

   if (dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER)

      goto fallback;

   /* Fallback for depth&stencil. XXX: see if we can use a proxy format */

   desc = util_format_description(src->format);

   if (desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)

      goto fallback;

   desc = util_format_description(dst->format);

   if (desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)

      goto fallback;

   util_blitter_default_dst_texture(&dst_templ, dst, dst_level, dstz);

   util_blitter_default_src_texture(&src_templ, src, src_level);

   if (!util_blitter_is_copy_supported(i915->blitter, dst, src))

      goto fallback;

   i915_util_blitter_save_states(i915);

   dst_view = i915_create_surface_custom(pipe, dst, &dst_templ, dst_width0, dst_height0);

   src_view = i915_create_sampler_view_custom(pipe, src, &src_templ, src_width0, src_height0);

   u_box_3d(dstx, dsty, dstz, abs(src_box->width), abs(src_box->height),

            abs(src_box->depth), &dstbox);

   util_blitter_blit_generic(i915->blitter, dst_view, &dstbox,

                             src_view, src_box, src_width0, src_height0,

                             PIPE_MASK_RGBAZS, PIPE_TEX_FILTER_NEAREST, NULL);

   return;

fallback:

   util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,

                             src, src_level, src_box);

}

static void

i915_clear_render_target_render(struct pipe_context *pipe,

                                struct pipe_surface *dst,

                                const union pipe_color_union *color,

                                unsigned dstx, unsigned dsty,

                                unsigned width, unsigned height)

{

   struct i915_context *i915 = i915_context(pipe);

   struct pipe_framebuffer_state fb_state;

   util_blitter_save_framebuffer(i915->blitter, &i915->framebuffer);

   fb_state.width = dst->width;

   fb_state.height = dst->height;

   fb_state.nr_cbufs = 1;

   fb_state.cbufs[0] = dst;

   fb_state.zsbuf = NULL;

   pipe->set_framebuffer_state(pipe, &fb_state);

   if (i915->dirty)

      i915_update_derived(i915);

   i915_clear_emit(pipe, PIPE_CLEAR_COLOR, color, 0.0, 0x0,

                   dstx, dsty, width, height);

   pipe->set_framebuffer_state(pipe, &i915->blitter->saved_fb_state);

   util_unreference_framebuffer_state(&i915->blitter->saved_fb_state);

   i915->blitter->saved_fb_state.nr_cbufs = ~0;

}

static void

i915_clear_depth_stencil_render(struct pipe_context *pipe,

                                struct pipe_surface *dst,

                                unsigned clear_flags,

                                double depth,

                                unsigned stencil,

                                unsigned dstx, unsigned dsty,

                                unsigned width, unsigned height)

{

   struct i915_context *i915 = i915_context(pipe);

   struct pipe_framebuffer_state fb_state;

   util_blitter_save_framebuffer(i915->blitter, &i915->framebuffer);

   fb_state.width = dst->width;

   fb_state.height = dst->height;

   fb_state.nr_cbufs = 0;

   fb_state.zsbuf = dst;

   pipe->set_framebuffer_state(pipe, &fb_state);

   if (i915->dirty)

      i915_update_derived(i915);

   i915_clear_emit(pipe, clear_flags & PIPE_CLEAR_DEPTHSTENCIL,

                   NULL, depth, stencil,

                   dstx, dsty, width, height);

   pipe->set_framebuffer_state(pipe, &i915->blitter->saved_fb_state);

   util_unreference_framebuffer_state(&i915->blitter->saved_fb_state);

   i915->blitter->saved_fb_state.nr_cbufs = ~0;

}

/*

 * surface functions using the blitter

 */

/* Assumes all values are within bounds -- no checking at this level -

 * do it higher up if required.

 */

static void

i915_surface_copy_blitter(struct pipe_context *pipe,

                          struct pipe_resource *dst, unsigned dst_level,

                          unsigned dstx, unsigned dsty, unsigned dstz,

                          struct pipe_resource *src, unsigned src_level,

                          const struct pipe_box *src_box)

{

   struct i915_texture *dst_tex = i915_texture(dst);

   struct i915_texture *src_tex = i915_texture(src);

   struct pipe_resource *dpt = &dst_tex->b.b;

   struct pipe_resource *spt = &src_tex->b.b;

   unsigned dst_offset, src_offset;  /* in bytes */

   /* Fallback for buffers. */

   if (dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) {

      util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,

                                src, src_level, src_box);

      return;

   }

   /* XXX cannot copy 3d regions at this time */

   assert(src_box->depth == 1);

   if (dst->target != PIPE_TEXTURE_CUBE &&

       dst->target != PIPE_TEXTURE_3D)

      assert(dstz == 0);

   dst_offset = i915_texture_offset(dst_tex, dst_level, dstz);

   if (src->target != PIPE_TEXTURE_CUBE &&

       src->target != PIPE_TEXTURE_3D)

      assert(src_box->z == 0);

   src_offset = i915_texture_offset(src_tex, src_level, src_box->z);

   assert( util_format_get_blocksize(dpt->format) == util_format_get_blocksize(spt->format) );

   assert( util_format_get_blockwidth(dpt->format) == util_format_get_blockwidth(spt->format) );

   assert( util_format_get_blockheight(dpt->format) == util_format_get_blockheight(spt->format) );

   assert( util_format_get_blockwidth(dpt->format) == 1 );

   assert( util_format_get_blockheight(dpt->format) == 1 );

   i915_copy_blit( i915_context(pipe),

                   util_format_get_blocksize(dpt->format),

                   (unsigned short) src_tex->stride, src_tex->buffer, src_offset,

                   (unsigned short) dst_tex->stride, dst_tex->buffer, dst_offset,

                   (short) src_box->x, (short) src_box->y, (short) dstx, (short) dsty,

                   (short) src_box->width, (short) src_box->height );

}

static void

i915_blit(struct pipe_context *pipe, const struct pipe_blit_info *blit_info)

{

   struct i915_context *i915 = i915_context(pipe);

   struct pipe_blit_info info = *blit_info;

   if (util_try_blit_via_copy_region(pipe, &info)) {

      return; /* done */

   }

   if (info.mask & PIPE_MASK_S) {

      debug_printf("i915: cannot blit stencil, skipping\n");

      info.mask &= ~PIPE_MASK_S;

   }

   if (!util_blitter_is_blit_supported(i915->blitter, &info)) {

      debug_printf("i915: blit unsupported %s -> %s\n",

                   util_format_short_name(info.src.resource->format),

                   util_format_short_name(info.dst.resource->format));

      return;

   }

   i915_util_blitter_save_states(i915);

   util_blitter_blit(i915->blitter, &info);

}

static void

i915_flush_resource(struct pipe_context *ctx, struct pipe_resource *resource)

{

}

static void

i915_clear_render_target_blitter(struct pipe_context *pipe,

                                 struct pipe_surface *dst,

                                 const union pipe_color_union *color,

                                 unsigned dstx, unsigned dsty,

                                 unsigned width, unsigned height)

{

   struct i915_texture *tex = i915_texture(dst->texture);

   struct pipe_resource *pt = &tex->b.b;

   union util_color uc;

   unsigned offset = i915_texture_offset(tex, dst->u.tex.level, dst->u.tex.first_layer);

   assert(util_format_get_blockwidth(pt->format) == 1);

   assert(util_format_get_blockheight(pt->format) == 1);

   util_pack_color(color->f, dst->format, &uc);

   i915_fill_blit( i915_context(pipe),

                   util_format_get_blocksize(pt->format),

                   XY_COLOR_BLT_WRITE_ALPHA | XY_COLOR_BLT_WRITE_RGB,

                   (unsigned short) tex->stride,

                   tex->buffer, offset,

                   (short) dstx, (short) dsty,

                   (short) width, (short) height,

                   uc.ui[0] );

}

static void

i915_clear_depth_stencil_blitter(struct pipe_context *pipe,

                                 struct pipe_surface *dst,

                                 unsigned clear_flags,

                                 double depth,

                                 unsigned stencil,

                                 unsigned dstx, unsigned dsty,

                                 unsigned width, unsigned height)

{

   struct i915_texture *tex = i915_texture(dst->texture);

   struct pipe_resource *pt = &tex->b.b;

   unsigned packedds;

   unsigned mask = 0;

   unsigned offset = i915_texture_offset(tex, dst->u.tex.level, dst->u.tex.first_layer);

   assert(util_format_get_blockwidth(pt->format) == 1);

   assert(util_format_get_blockheight(pt->format) == 1);

   packedds = util_pack_z_stencil(dst->format, depth, stencil);

   if (clear_flags & PIPE_CLEAR_DEPTH)

      mask |= XY_COLOR_BLT_WRITE_RGB;

   /* XXX presumably this does read-modify-write

      (otherwise this won't work anyway). Hence will only want to

      do it if really have stencil and it isn't cleared */

   if ((clear_flags & PIPE_CLEAR_STENCIL) ||

       (dst->format != PIPE_FORMAT_Z24_UNORM_S8_UINT))

      mask |= XY_COLOR_BLT_WRITE_ALPHA;

   i915_fill_blit( i915_context(pipe),

                   util_format_get_blocksize(pt->format),

                   mask,

                   (unsigned short) tex->stride,

                   tex->buffer, offset,

                   (short) dstx, (short) dsty,

                   (short) width, (short) height,

                   packedds );

}

/*

 * Screen surface functions

 */

static struct pipe_surface *

i915_create_surface_custom(struct pipe_context *ctx,

                           struct pipe_resource *pt,

                           const struct pipe_surface *surf_tmpl,

                           unsigned width0,

                           unsigned height0)

{

   struct pipe_surface *ps;

   assert(surf_tmpl->u.tex.first_layer == surf_tmpl->u.tex.last_layer);

   if (pt->target != PIPE_TEXTURE_CUBE &&

       pt->target != PIPE_TEXTURE_3D)

      assert(surf_tmpl->u.tex.first_layer == 0);

   ps = CALLOC_STRUCT(pipe_surface);

   if (ps) {

      /* could subclass pipe_surface and store offset as it used to do */

      pipe_reference_init(&ps->reference, 1);

      pipe_resource_reference(&ps->texture, pt);

      ps->format = surf_tmpl->format;

      ps->width = u_minify(width0, surf_tmpl->u.tex.level);

      ps->height = u_minify(height0, surf_tmpl->u.tex.level);

      ps->u.tex.level = surf_tmpl->u.tex.level;

      ps->u.tex.first_layer = surf_tmpl->u.tex.first_layer;

      ps->u.tex.last_layer = surf_tmpl->u.tex.last_layer;

      ps->context = ctx;

   }

   return ps;

}

static struct pipe_surface *

i915_create_surface(struct pipe_context *ctx,

                    struct pipe_resource *pt,

                    const struct pipe_surface *surf_tmpl)

{

   return i915_create_surface_custom(ctx, pt, surf_tmpl,

                                     pt->width0, pt->height0);

}

static void

i915_surface_destroy(struct pipe_context *ctx,

                     struct pipe_surface *surf)

{

   pipe_resource_reference(&surf->texture, NULL);

   FREE(surf);

}

void

i915_init_surface_functions(struct i915_context *i915)

{

   if (i915_screen(i915->base.screen)->debug.use_blitter) {

      i915->base.resource_copy_region = i915_surface_copy_blitter;

      i915->base.clear_render_target = i915_clear_render_target_blitter;

      i915->base.clear_depth_stencil = i915_clear_depth_stencil_blitter;

   } else {

      i915->base.resource_copy_region = i915_surface_copy_render;

      i915->base.clear_render_target = i915_clear_render_target_render;

      i915->base.clear_depth_stencil = i915_clear_depth_stencil_render;

   }

   i915->base.blit = i915_blit;

   i915->base.flush_resource = i915_flush_resource;

   i915->base.create_surface = i915_create_surface;

   i915->base.surface_destroy = i915_surface_destroy;

}