src/gallium/drivers/i915/i915_surface.c - platform/external/mesa3d - Git at Google

 /**************************************************************************
  *
  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
  * 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 TUNGSTEN GRAPHICS 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"

 /*
  * surface functions using the render engine
  */

 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);

    /* 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;
    }

    if (!util_blitter_is_copy_supported(i915->blitter, dst, src,
                                        PIPE_MASK_RGBAZS)) {
       util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
                                 src, src_level, src_box);
       return;
    }

    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->saved_fs);
    util_blitter_save_vertex_shader(i915->blitter, i915->saved_vs);
    util_blitter_save_viewport(i915->blitter, &i915->viewport);
    util_blitter_save_vertex_elements(i915->blitter, i915->saved_velems);
    util_blitter_save_vertex_buffers(i915->blitter, i915->saved_nr_vertex_buffers,
                                     i915->saved_vertex_buffers);

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

    util_blitter_save_fragment_sampler_states(i915->blitter,
                                              i915->saved_nr_samplers,
                                              i915->saved_samplers);
    util_blitter_save_fragment_sampler_views(i915->blitter,
                                             i915->saved_nr_sampler_views,
                                             i915->saved_sampler_views);

    util_blitter_copy_texture(i915->blitter, dst, dst_level, ~0, dstx, dsty, dstz,
                             src, src_level, 0, 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_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 );
 }

 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(struct pipe_context *ctx,
                     struct pipe_resource *pt,
                     const struct pipe_surface *surf_tmpl)
 {
    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(pt->width0, surf_tmpl->u.tex.level);
       ps->height = u_minify(pt->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->usage = surf_tmpl->usage;
       ps->context = ctx;
    }
    return ps;
 }

 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.create_surface = i915_create_surface;
    i915->base.surface_destroy = i915_surface_destroy;
 }
	/**************************************************************************
	*
	* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
	* 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 TUNGSTEN GRAPHICS 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"

	/*
	* surface functions using the render engine
	*/

	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);

	/* 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;
	}

	if (!util_blitter_is_copy_supported(i915->blitter, dst, src,
	PIPE_MASK_RGBAZS)) {
	util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
	src, src_level, src_box);
	return;
	}

	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->saved_fs);
	util_blitter_save_vertex_shader(i915->blitter, i915->saved_vs);
	util_blitter_save_viewport(i915->blitter, &i915->viewport);
	util_blitter_save_vertex_elements(i915->blitter, i915->saved_velems);
	util_blitter_save_vertex_buffers(i915->blitter, i915->saved_nr_vertex_buffers,
	i915->saved_vertex_buffers);

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

	util_blitter_save_fragment_sampler_states(i915->blitter,
	i915->saved_nr_samplers,
	i915->saved_samplers);
	util_blitter_save_fragment_sampler_views(i915->blitter,
	i915->saved_nr_sampler_views,
	i915->saved_sampler_views);

	util_blitter_copy_texture(i915->blitter, dst, dst_level, ~0, dstx, dsty, dstz,
	src, src_level, 0, 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_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 );
	}

	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(struct pipe_context *ctx,
	struct pipe_resource *pt,
	const struct pipe_surface *surf_tmpl)
	{
	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(pt->width0, surf_tmpl->u.tex.level);
	ps->height = u_minify(pt->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->usage = surf_tmpl->usage;
	ps->context = ctx;
	}
	return ps;
	}

	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.create_surface = i915_create_surface;
	i915->base.surface_destroy = i915_surface_destroy;
	}