src/gallium/drivers/r300/r300_texture.c - fp2-dev/platform/external/mesa3d - Gitiles

 /*
  * Copyright 2008 Corbin Simpson <MostAwesomeDude@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 "pipe/p_screen.h"

 #include "util/u_format.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"

 #include "r300_context.h"
 #include "r300_texture.h"
 #include "r300_screen.h"

 #include "radeon_winsys.h"

 #define TILE_WIDTH 0
 #define TILE_HEIGHT 1

 static const unsigned microblock_table[5][3][2] = {
     /*linear  tiled   square-tiled */
     {{32, 1}, {8, 4}, {0, 0}}, /*   8 bits per pixel */
     {{16, 1}, {8, 2}, {4, 4}}, /*  16 bits per pixel */
     {{ 8, 1}, {4, 2}, {0, 0}}, /*  32 bits per pixel */
     {{ 4, 1}, {0, 0}, {2, 2}}, /*  64 bits per pixel */
     {{ 2, 1}, {0, 0}, {0, 0}}  /* 128 bits per pixel */
 };

 static void r300_setup_texture_state(struct r300_screen* screen, struct r300_texture* tex)
 {
     struct r300_texture_state* state = &tex->state;
     struct pipe_texture *pt = &tex->tex;
     boolean is_r500 = screen->caps->is_r500;

     state->format0 = R300_TX_WIDTH((pt->width0 - 1) & 0x7ff) |
                      R300_TX_HEIGHT((pt->height0 - 1) & 0x7ff);

     if (tex->is_npot) {
         /* rectangles love this */
         state->format0 |= R300_TX_PITCH_EN;
         state->format2 = (tex->pitch[0] - 1) & 0x1fff;
     } else {
         /* power of two textures (3D, mipmaps, and no pitch) */
         state->format0 |= R300_TX_DEPTH(util_logbase2(pt->depth0) & 0xf);
     }

     state->format1 = r300_translate_texformat(pt->format);
     if (pt->target == PIPE_TEXTURE_CUBE) {
         state->format1 |= R300_TX_FORMAT_CUBIC_MAP;
     }
     if (pt->target == PIPE_TEXTURE_3D) {
         state->format1 |= R300_TX_FORMAT_3D;
     }

     /* large textures on r500 */
     if (is_r500)
     {
         if (pt->width0 > 2048) {
             state->format2 |= R500_TXWIDTH_BIT11;
         }
         if (pt->height0 > 2048) {
             state->format2 |= R500_TXHEIGHT_BIT11;
         }
     }
     assert(is_r500 || (pt->width0 <= 2048 && pt->height0 <= 2048));

     SCREEN_DBG(screen, DBG_TEX, "r300: Set texture state (%dx%d, %d levels)\n",
                pt->width0, pt->height0, pt->last_level);
 }

 unsigned r300_texture_get_offset(struct r300_texture* tex, unsigned level,
                                  unsigned zslice, unsigned face)
 {
     unsigned offset = tex->offset[level];

     switch (tex->tex.target) {
         case PIPE_TEXTURE_3D:
             assert(face == 0);
             return offset + zslice * tex->layer_size[level];

         case PIPE_TEXTURE_CUBE:
             assert(zslice == 0);
             return offset + face * tex->layer_size[level];

         default:
             assert(zslice == 0 && face == 0);
             return offset;
     }
 }

 /**
  * Return the width (dim==TILE_WIDTH) or height (dim==TILE_HEIGHT) of one tile
  * of the given texture.
  */
 static unsigned r300_texture_get_tile_size(struct r300_texture* tex, int dim)
 {
     unsigned pixsize, tile_size;

     pixsize = util_format_get_blocksize(tex->tex.format);
     tile_size = microblock_table[util_logbase2(pixsize)][tex->microtile][dim] *
                 (tex->macrotile == R300_BUFFER_TILED ? 8 : 1);

     assert(tile_size);
     return tile_size;
 }

 /**
  * Return the stride, in bytes, of the texture images of the given texture
  * at the given level.
  */
 unsigned r300_texture_get_stride(struct r300_screen* screen,
                                  struct r300_texture* tex, unsigned level)
 {
     unsigned tile_width, width;

     if (tex->stride_override)
         return tex->stride_override;

     /* Check the level. */
     if (level > tex->tex.last_level) {
         SCREEN_DBG(screen, DBG_TEX, "%s: level (%u) > last_level (%u)\n",
                    __FUNCTION__, level, tex->tex.last_level);
         return 0;
     }

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

     if (!util_format_is_compressed(tex->tex.format)) {
         tile_width = r300_texture_get_tile_size(tex, TILE_WIDTH);
         width = align(width, tile_width);
         return util_format_get_stride(tex->tex.format, width);
     } else {
         return align(util_format_get_stride(tex->tex.format, width), 32);
     }
 }

 static unsigned r300_texture_get_nblocksy(struct r300_texture* tex,
                                           unsigned level)
 {
     unsigned height, tile_height;

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

     if (!util_format_is_compressed(tex->tex.format)) {
         tile_height = r300_texture_get_tile_size(tex, TILE_HEIGHT);
         height = align(height, tile_height);
     }

     return util_format_get_nblocksy(tex->tex.format, height);
 }

 static void r300_setup_miptree(struct r300_screen* screen,
                                struct r300_texture* tex)
 {
     struct pipe_texture* base = &tex->tex;
     unsigned stride, size, layer_size, nblocksy, i;

     SCREEN_DBG(screen, DBG_TEX, "r300: Making miptree for texture, format %s\n",
                pf_name(base->format));

     for (i = 0; i <= base->last_level; i++) {
         stride = r300_texture_get_stride(screen, tex, i);
         nblocksy = r300_texture_get_nblocksy(tex, i);
         layer_size = stride * nblocksy;

         if (base->target == PIPE_TEXTURE_CUBE)
             size = layer_size * 6;
         else
             size = layer_size * u_minify(base->depth0, i);

         tex->offset[i] = align(tex->size, 32);
         tex->size = tex->offset[i] + size;
         tex->layer_size[i] = layer_size;
         tex->pitch[i] = stride / util_format_get_blocksize(base->format);

         SCREEN_DBG(screen, DBG_TEX, "r300: Texture miptree: Level %d "
                 "(%dx%dx%d px, pitch %d bytes) %d bytes total\n",
                 i, u_minify(base->width0, i), u_minify(base->height0, i),
                 u_minify(base->depth0, i), stride, tex->size);
     }
 }

 static void r300_setup_flags(struct r300_texture* tex)
 {
     tex->is_npot = !util_is_power_of_two(tex->tex.width0) ||
                    !util_is_power_of_two(tex->tex.height0);
 }

 /* Create a new texture. */
 static struct pipe_texture*
     r300_texture_create(struct pipe_screen* screen,
                         const struct pipe_texture* template)
 {
     struct r300_texture* tex = CALLOC_STRUCT(r300_texture);
     struct r300_screen* rscreen = r300_screen(screen);
     struct radeon_winsys* winsys = (struct radeon_winsys*)screen->winsys;

     if (!tex) {
         return NULL;
     }

     tex->tex = *template;
     pipe_reference_init(&tex->tex.reference, 1);
     tex->tex.screen = screen;

     r300_setup_flags(tex);
     r300_setup_miptree(rscreen, tex);
     r300_setup_texture_state(rscreen, tex);

     tex->buffer = screen->buffer_create(screen, 2048,
                                         PIPE_BUFFER_USAGE_PIXEL,
                                         tex->size);
     winsys->buffer_set_tiling(winsys, tex->buffer,
                               tex->pitch[0],
                               tex->microtile != R300_BUFFER_LINEAR,
                               tex->macrotile != R300_BUFFER_LINEAR);

     if (!tex->buffer) {
         FREE(tex);
         return NULL;
     }

     return (struct pipe_texture*)tex;
 }

 static void r300_texture_destroy(struct pipe_texture* texture)
 {
     struct r300_texture* tex = (struct r300_texture*)texture;

     pipe_buffer_reference(&tex->buffer, NULL);

     FREE(tex);
 }

 static struct pipe_surface* r300_get_tex_surface(struct pipe_screen* screen,
                                                  struct pipe_texture* texture,
                                                  unsigned face,
                                                  unsigned level,
                                                  unsigned zslice,
                                                  unsigned flags)
 {
     struct r300_texture* tex = (struct r300_texture*)texture;
     struct pipe_surface* surface = CALLOC_STRUCT(pipe_surface);
     unsigned offset;

     offset = r300_texture_get_offset(tex, level, zslice, face);

     if (surface) {
         pipe_reference_init(&surface->reference, 1);
         pipe_texture_reference(&surface->texture, texture);
         surface->format = texture->format;
         surface->width = u_minify(texture->width0, level);
         surface->height = u_minify(texture->height0, level);
         surface->offset = offset;
         surface->usage = flags;
         surface->zslice = zslice;
         surface->texture = texture;
         surface->face = face;
         surface->level = level;
     }

     return surface;
 }

 static void r300_tex_surface_destroy(struct pipe_surface* s)
 {
     pipe_texture_reference(&s->texture, NULL);
     FREE(s);
 }

 static struct pipe_texture*
     r300_texture_blanket(struct pipe_screen* screen,
                          const struct pipe_texture* base,
                          const unsigned* stride,
                          struct pipe_buffer* buffer)
 {
     struct r300_texture* tex;
     struct r300_screen* rscreen = r300_screen(screen);

     /* Support only 2D textures without mipmaps */
     if (base->target != PIPE_TEXTURE_2D ||
         base->depth0 != 1 ||
         base->last_level != 0) {
         return NULL;
     }

     tex = CALLOC_STRUCT(r300_texture);
     if (!tex) {
         return NULL;
     }

     tex->tex = *base;
     pipe_reference_init(&tex->tex.reference, 1);
     tex->tex.screen = screen;

     tex->stride_override = *stride;
     tex->pitch[0] = *stride / util_format_get_blocksize(base->format);

     r300_setup_flags(tex);
     r300_setup_texture_state(rscreen, tex);

     pipe_buffer_reference(&tex->buffer, buffer);

     return (struct pipe_texture*)tex;
 }

 static struct pipe_video_surface *
 r300_video_surface_create(struct pipe_screen *screen,
                           enum pipe_video_chroma_format chroma_format,
                           unsigned width, unsigned height)
 {
     struct r300_video_surface *r300_vsfc;
     struct pipe_texture template;

     assert(screen);
     assert(width && height);

     r300_vsfc = CALLOC_STRUCT(r300_video_surface);
     if (!r300_vsfc)
        return NULL;

     pipe_reference_init(&r300_vsfc->base.reference, 1);
     r300_vsfc->base.screen = screen;
     r300_vsfc->base.chroma_format = chroma_format;
     r300_vsfc->base.width = width;
     r300_vsfc->base.height = height;

     memset(&template, 0, sizeof(struct pipe_texture));
     template.target = PIPE_TEXTURE_2D;
     template.format = PIPE_FORMAT_X8R8G8B8_UNORM;
     template.last_level = 0;
     template.width0 = util_next_power_of_two(width);
     template.height0 = util_next_power_of_two(height);
     template.depth0 = 1;
     template.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER |
                          PIPE_TEXTURE_USAGE_RENDER_TARGET;

     r300_vsfc->tex = screen->texture_create(screen, &template);
     if (!r300_vsfc->tex)
     {
         FREE(r300_vsfc);
         return NULL;
     }

     return &r300_vsfc->base;
 }

 static void r300_video_surface_destroy(struct pipe_video_surface *vsfc)
 {
     struct r300_video_surface *r300_vsfc = r300_video_surface(vsfc);
     pipe_texture_reference(&r300_vsfc->tex, NULL);
     FREE(r300_vsfc);
 }

 void r300_init_screen_texture_functions(struct pipe_screen* screen)
 {
     screen->texture_create = r300_texture_create;
     screen->texture_destroy = r300_texture_destroy;
     screen->get_tex_surface = r300_get_tex_surface;
     screen->tex_surface_destroy = r300_tex_surface_destroy;
     screen->texture_blanket = r300_texture_blanket;

     screen->video_surface_create = r300_video_surface_create;
     screen->video_surface_destroy= r300_video_surface_destroy;
 }

 boolean r300_get_texture_buffer(struct pipe_screen* screen,
                                 struct pipe_texture* texture,
                                 struct pipe_buffer** buffer,
                                 unsigned* stride)
 {
     struct r300_texture* tex = (struct r300_texture*)texture;
     if (!tex) {
         return FALSE;
     }

     pipe_buffer_reference(buffer, tex->buffer);

     if (stride) {
         *stride = r300_texture_get_stride(r300_screen(screen), tex, 0);
     }

     return TRUE;
 }
	/*
	* Copyright 2008 Corbin Simpson <MostAwesomeDude@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 "pipe/p_screen.h"

	#include "util/u_format.h"
	#include "util/u_math.h"
	#include "util/u_memory.h"

	#include "r300_context.h"
	#include "r300_texture.h"
	#include "r300_screen.h"

	#include "radeon_winsys.h"

	#define TILE_WIDTH 0
	#define TILE_HEIGHT 1

	static const unsigned microblock_table[5][3][2] = {
	/linear tiled square-tiled /
	{{32, 1}, {8, 4}, {0, 0}}, /* 8 bits per pixel */
	{{16, 1}, {8, 2}, {4, 4}}, /* 16 bits per pixel */
	{{ 8, 1}, {4, 2}, {0, 0}}, /* 32 bits per pixel */
	{{ 4, 1}, {0, 0}, {2, 2}}, /* 64 bits per pixel */
	{{ 2, 1}, {0, 0}, {0, 0}} /* 128 bits per pixel */
	};

	static void r300_setup_texture_state(struct r300_screen* screen, struct r300_texture* tex)
	{
	struct r300_texture_state* state = &tex->state;
	struct pipe_texture *pt = &tex->tex;
	boolean is_r500 = screen->caps->is_r500;

	state->format0 = R300_TX_WIDTH((pt->width0 - 1) & 0x7ff) \|
	R300_TX_HEIGHT((pt->height0 - 1) & 0x7ff);

	if (tex->is_npot) {
	/* rectangles love this */
	state->format0 \|= R300_TX_PITCH_EN;
	state->format2 = (tex->pitch[0] - 1) & 0x1fff;
	} else {
	/* power of two textures (3D, mipmaps, and no pitch) */
	state->format0 \|= R300_TX_DEPTH(util_logbase2(pt->depth0) & 0xf);
	}

	state->format1 = r300_translate_texformat(pt->format);
	if (pt->target == PIPE_TEXTURE_CUBE) {
	state->format1 \|= R300_TX_FORMAT_CUBIC_MAP;
	}
	if (pt->target == PIPE_TEXTURE_3D) {
	state->format1 \|= R300_TX_FORMAT_3D;
	}

	/* large textures on r500 */
	if (is_r500)
	{
	if (pt->width0 > 2048) {
	state->format2 \|= R500_TXWIDTH_BIT11;
	}
	if (pt->height0 > 2048) {
	state->format2 \|= R500_TXHEIGHT_BIT11;
	}
	}
	assert(is_r500 \|\| (pt->width0 <= 2048 && pt->height0 <= 2048));

	SCREEN_DBG(screen, DBG_TEX, "r300: Set texture state (%dx%d, %d levels)\n",
	pt->width0, pt->height0, pt->last_level);
	}

	unsigned r300_texture_get_offset(struct r300_texture* tex, unsigned level,
	unsigned zslice, unsigned face)
	{
	unsigned offset = tex->offset[level];

	switch (tex->tex.target) {
	case PIPE_TEXTURE_3D:
	assert(face == 0);
	return offset + zslice * tex->layer_size[level];

	case PIPE_TEXTURE_CUBE:
	assert(zslice == 0);
	return offset + face * tex->layer_size[level];

	default:
	assert(zslice == 0 && face == 0);
	return offset;
	}
	}

	/**
	* Return the width (dim==TILE_WIDTH) or height (dim==TILE_HEIGHT) of one tile
	* of the given texture.
	*/
	static unsigned r300_texture_get_tile_size(struct r300_texture* tex, int dim)
	{
	unsigned pixsize, tile_size;

	pixsize = util_format_get_blocksize(tex->tex.format);
	tile_size = microblock_table[util_logbase2(pixsize)][tex->microtile][dim] *
	(tex->macrotile == R300_BUFFER_TILED ? 8 : 1);

	assert(tile_size);
	return tile_size;
	}

	/**
	* Return the stride, in bytes, of the texture images of the given texture
	* at the given level.
	*/
	unsigned r300_texture_get_stride(struct r300_screen* screen,
	struct r300_texture* tex, unsigned level)
	{
	unsigned tile_width, width;

	if (tex->stride_override)
	return tex->stride_override;

	/* Check the level. */
	if (level > tex->tex.last_level) {
	SCREEN_DBG(screen, DBG_TEX, "%s: level (%u) > last_level (%u)\n",
	__FUNCTION__, level, tex->tex.last_level);
	return 0;
	}

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

	if (!util_format_is_compressed(tex->tex.format)) {
	tile_width = r300_texture_get_tile_size(tex, TILE_WIDTH);
	width = align(width, tile_width);
	return util_format_get_stride(tex->tex.format, width);
	} else {
	return align(util_format_get_stride(tex->tex.format, width), 32);
	}
	}

	static unsigned r300_texture_get_nblocksy(struct r300_texture* tex,
	unsigned level)
	{
	unsigned height, tile_height;

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

	if (!util_format_is_compressed(tex->tex.format)) {
	tile_height = r300_texture_get_tile_size(tex, TILE_HEIGHT);
	height = align(height, tile_height);
	}

	return util_format_get_nblocksy(tex->tex.format, height);
	}

	static void r300_setup_miptree(struct r300_screen* screen,
	struct r300_texture* tex)
	{
	struct pipe_texture* base = &tex->tex;
	unsigned stride, size, layer_size, nblocksy, i;

	SCREEN_DBG(screen, DBG_TEX, "r300: Making miptree for texture, format %s\n",
	pf_name(base->format));

	for (i = 0; i <= base->last_level; i++) {
	stride = r300_texture_get_stride(screen, tex, i);
	nblocksy = r300_texture_get_nblocksy(tex, i);
	layer_size = stride * nblocksy;

	if (base->target == PIPE_TEXTURE_CUBE)
	size = layer_size * 6;
	else
	size = layer_size * u_minify(base->depth0, i);

	tex->offset[i] = align(tex->size, 32);
	tex->size = tex->offset[i] + size;
	tex->layer_size[i] = layer_size;
	tex->pitch[i] = stride / util_format_get_blocksize(base->format);

	SCREEN_DBG(screen, DBG_TEX, "r300: Texture miptree: Level %d "
	"(%dx%dx%d px, pitch %d bytes) %d bytes total\n",
	i, u_minify(base->width0, i), u_minify(base->height0, i),
	u_minify(base->depth0, i), stride, tex->size);
	}
	}

	static void r300_setup_flags(struct r300_texture* tex)
	{
	tex->is_npot = !util_is_power_of_two(tex->tex.width0) \|\|
	!util_is_power_of_two(tex->tex.height0);
	}

	/* Create a new texture. */
	static struct pipe_texture*
	r300_texture_create(struct pipe_screen* screen,
	const struct pipe_texture* template)
	{
	struct r300_texture* tex = CALLOC_STRUCT(r300_texture);
	struct r300_screen* rscreen = r300_screen(screen);
	struct radeon_winsys* winsys = (struct radeon_winsys*)screen->winsys;

	if (!tex) {
	return NULL;
	}

	tex->tex = *template;
	pipe_reference_init(&tex->tex.reference, 1);
	tex->tex.screen = screen;

	r300_setup_flags(tex);
	r300_setup_miptree(rscreen, tex);
	r300_setup_texture_state(rscreen, tex);

	tex->buffer = screen->buffer_create(screen, 2048,
	PIPE_BUFFER_USAGE_PIXEL,
	tex->size);
	winsys->buffer_set_tiling(winsys, tex->buffer,
	tex->pitch[0],
	tex->microtile != R300_BUFFER_LINEAR,
	tex->macrotile != R300_BUFFER_LINEAR);

	if (!tex->buffer) {
	FREE(tex);
	return NULL;
	}

	return (struct pipe_texture*)tex;
	}

	static void r300_texture_destroy(struct pipe_texture* texture)
	{
	struct r300_texture* tex = (struct r300_texture*)texture;

	pipe_buffer_reference(&tex->buffer, NULL);

	FREE(tex);
	}

	static struct pipe_surface* r300_get_tex_surface(struct pipe_screen* screen,
	struct pipe_texture* texture,
	unsigned face,
	unsigned level,
	unsigned zslice,
	unsigned flags)
	{
	struct r300_texture* tex = (struct r300_texture*)texture;
	struct pipe_surface* surface = CALLOC_STRUCT(pipe_surface);
	unsigned offset;

	offset = r300_texture_get_offset(tex, level, zslice, face);

	if (surface) {
	pipe_reference_init(&surface->reference, 1);
	pipe_texture_reference(&surface->texture, texture);
	surface->format = texture->format;
	surface->width = u_minify(texture->width0, level);
	surface->height = u_minify(texture->height0, level);
	surface->offset = offset;
	surface->usage = flags;
	surface->zslice = zslice;
	surface->texture = texture;
	surface->face = face;
	surface->level = level;
	}

	return surface;
	}

	static void r300_tex_surface_destroy(struct pipe_surface* s)
	{
	pipe_texture_reference(&s->texture, NULL);
	FREE(s);
	}

	static struct pipe_texture*
	r300_texture_blanket(struct pipe_screen* screen,
	const struct pipe_texture* base,
	const unsigned* stride,
	struct pipe_buffer* buffer)
	{
	struct r300_texture* tex;
	struct r300_screen* rscreen = r300_screen(screen);

	/* Support only 2D textures without mipmaps */
	if (base->target != PIPE_TEXTURE_2D \|\|
	base->depth0 != 1 \|\|
	base->last_level != 0) {
	return NULL;
	}

	tex = CALLOC_STRUCT(r300_texture);
	if (!tex) {
	return NULL;
	}

	tex->tex = *base;
	pipe_reference_init(&tex->tex.reference, 1);
	tex->tex.screen = screen;

	tex->stride_override = *stride;
	tex->pitch[0] = *stride / util_format_get_blocksize(base->format);

	r300_setup_flags(tex);
	r300_setup_texture_state(rscreen, tex);

	pipe_buffer_reference(&tex->buffer, buffer);

	return (struct pipe_texture*)tex;
	}

	static struct pipe_video_surface *
	r300_video_surface_create(struct pipe_screen *screen,
	enum pipe_video_chroma_format chroma_format,
	unsigned width, unsigned height)
	{
	struct r300_video_surface *r300_vsfc;
	struct pipe_texture template;

	assert(screen);
	assert(width && height);

	r300_vsfc = CALLOC_STRUCT(r300_video_surface);
	if (!r300_vsfc)
	return NULL;

	pipe_reference_init(&r300_vsfc->base.reference, 1);
	r300_vsfc->base.screen = screen;
	r300_vsfc->base.chroma_format = chroma_format;
	r300_vsfc->base.width = width;
	r300_vsfc->base.height = height;

	memset(&template, 0, sizeof(struct pipe_texture));
	template.target = PIPE_TEXTURE_2D;
	template.format = PIPE_FORMAT_X8R8G8B8_UNORM;
	template.last_level = 0;
	template.width0 = util_next_power_of_two(width);
	template.height0 = util_next_power_of_two(height);
	template.depth0 = 1;
	template.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER \|
	PIPE_TEXTURE_USAGE_RENDER_TARGET;

	r300_vsfc->tex = screen->texture_create(screen, &template);
	if (!r300_vsfc->tex)
	{
	FREE(r300_vsfc);
	return NULL;
	}

	return &r300_vsfc->base;
	}

	static void r300_video_surface_destroy(struct pipe_video_surface *vsfc)
	{
	struct r300_video_surface *r300_vsfc = r300_video_surface(vsfc);
	pipe_texture_reference(&r300_vsfc->tex, NULL);
	FREE(r300_vsfc);
	}

	void r300_init_screen_texture_functions(struct pipe_screen* screen)
	{
	screen->texture_create = r300_texture_create;
	screen->texture_destroy = r300_texture_destroy;
	screen->get_tex_surface = r300_get_tex_surface;
	screen->tex_surface_destroy = r300_tex_surface_destroy;
	screen->texture_blanket = r300_texture_blanket;

	screen->video_surface_create = r300_video_surface_create;
	screen->video_surface_destroy= r300_video_surface_destroy;
	}

	boolean r300_get_texture_buffer(struct pipe_screen* screen,
	struct pipe_texture* texture,
	struct pipe_buffer** buffer,
	unsigned* stride)
	{
	struct r300_texture* tex = (struct r300_texture*)texture;
	if (!tex) {
	return FALSE;
	}

	pipe_buffer_reference(buffer, tex->buffer);

	if (stride) {
	*stride = r300_texture_get_stride(r300_screen(screen), tex, 0);
	}

	return TRUE;
	}