src/gallium/drivers/r300/r300_context.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 "draw/draw_context.h"

 #include "util/u_memory.h"
 #include "util/u_sampler.h"
 #include "util/u_simple_list.h"
 #include "util/u_upload_mgr.h"

 #include "r300_cb.h"
 #include "r300_context.h"
 #include "r300_emit.h"
 #include "r300_screen.h"
 #include "r300_screen_buffer.h"
 #include "r300_state_invariant.h"
 #include "r300_winsys.h"

 #include <inttypes.h>

 static void r300_destroy_context(struct pipe_context* context)
 {
     struct r300_context* r300 = r300_context(context);
     struct r300_query *query, *temp;
     struct r300_atom *atom;

     if (r300->texkill_sampler) {
         pipe_sampler_view_reference(
                 (struct pipe_sampler_view**)&r300->texkill_sampler,
                 NULL);
     }

     util_blitter_destroy(r300->blitter);
     draw_destroy(r300->draw);

     /* Print stats, if enabled. */
     if (SCREEN_DBG_ON(r300->screen, DBG_STATS)) {
         fprintf(stderr, "r300: Stats for context %p:\n", r300);
         fprintf(stderr, "    : Flushes: %" PRIu64 "\n", r300->flush_counter);
         foreach(atom, &r300->atom_list) {
             fprintf(stderr, "    : %s: %" PRIu64 " emits\n",
                 atom->name, atom->counter);
         }
     }

     /* If there are any queries pending or not destroyed, remove them now. */
     foreach_s(query, temp, &r300->query_list) {
         remove_from_list(query);
         FREE(query);
     }

     u_upload_destroy(r300->upload_vb);
     u_upload_destroy(r300->upload_ib);

     translate_cache_destroy(r300->tran.translate_cache);

     FREE(r300->blend_color_state.state);
     FREE(r300->clip_state.state);
     FREE(r300->fb_state.state);
     FREE(r300->rs_block_state.state);
     FREE(r300->scissor_state.state);
     FREE(r300->textures_state.state);
     FREE(r300->viewport_state.state);
     FREE(r300->ztop_state.state);
     FREE(r300->fs_constants.state);
     FREE(r300->vs_constants.state);
     if (!r300->screen->caps.has_tcl) {
         FREE(r300->vertex_stream_state.state);
     }
     FREE(r300);
 }

 static void r300_flush_cb(void *data)
 {
     struct r300_context* const cs_context_copy = data;

     cs_context_copy->context.flush(&cs_context_copy->context, 0, NULL);
 }

 #define R300_INIT_ATOM(atomname, atomsize) \
     r300->atomname.name = #atomname; \
     r300->atomname.state = NULL; \
     r300->atomname.size = atomsize; \
     r300->atomname.emit = r300_emit_##atomname; \
     r300->atomname.dirty = FALSE; \
     insert_at_tail(&r300->atom_list, &r300->atomname);

 static void r300_setup_atoms(struct r300_context* r300)
 {
     boolean is_r500 = r300->screen->caps.is_r500;
     boolean has_tcl = r300->screen->caps.has_tcl;

     /* Create the actual atom list.
      *
      * Each atom is examined and emitted in the order it appears here, which
      * can affect performance and conformance if not handled with care.
      *
      * Some atoms never change size, others change every emit - those have
      * the size of 0 here. */
     make_empty_list(&r300->atom_list);
     /* XXX unsorted. */
     R300_INIT_ATOM(invariant_state, 71);
     /* RB3D (unpipelined), ZB (unpipelined), US, SC. */
     R300_INIT_ATOM(fb_state, 0);
     R300_INIT_ATOM(ztop_state, 2);
     R300_INIT_ATOM(dsa_state, is_r500 ? 8 : 6);
     R300_INIT_ATOM(blend_state, 8);
     R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2);
     R300_INIT_ATOM(scissor_state, 3);
     /* VAP. */
     R300_INIT_ATOM(viewport_state, 9);
     R300_INIT_ATOM(pvs_flush, 2);
     R300_INIT_ATOM(vertex_stream_state, 0);
     R300_INIT_ATOM(vs_state, 0);
     R300_INIT_ATOM(vs_constants, 0);
     R300_INIT_ATOM(clip_state, has_tcl ? 5 + (6 * 4) : 2);
     /* VAP, RS, GA, GB. */
     R300_INIT_ATOM(rs_block_state, 0);
     R300_INIT_ATOM(rs_state, 0);
     /* US. */
     R300_INIT_ATOM(fs, 0);
     R300_INIT_ATOM(fs_rc_constant_state, 0);
     R300_INIT_ATOM(fs_constants, 0);
     /* TX. */
     R300_INIT_ATOM(texture_cache_inval, 2);
     R300_INIT_ATOM(textures_state, 0);
     /* ZB (unpipelined), SU. */
     R300_INIT_ATOM(query_start, 4);

     /* Replace emission functions for r500. */
     if (r300->screen->caps.is_r500) {
         r300->fs.emit = r500_emit_fs;
         r300->fs_rc_constant_state.emit = r500_emit_fs_rc_constant_state;
         r300->fs_constants.emit = r500_emit_fs_constants;
     }

     /* Some non-CSO atoms need explicit space to store the state locally. */
     r300->blend_color_state.state = CALLOC_STRUCT(r300_blend_color_state);
     r300->clip_state.state = CALLOC_STRUCT(r300_clip_state);
     r300->fb_state.state = CALLOC_STRUCT(pipe_framebuffer_state);
     r300->rs_block_state.state = CALLOC_STRUCT(r300_rs_block);
     r300->scissor_state.state = CALLOC_STRUCT(pipe_scissor_state);
     r300->textures_state.state = CALLOC_STRUCT(r300_textures_state);
     r300->viewport_state.state = CALLOC_STRUCT(r300_viewport_state);
     r300->ztop_state.state = CALLOC_STRUCT(r300_ztop_state);
     r300->fs_constants.state = CALLOC_STRUCT(r300_constant_buffer);
     r300->vs_constants.state = CALLOC_STRUCT(r300_constant_buffer);
     if (!r300->screen->caps.has_tcl) {
         r300->vertex_stream_state.state = CALLOC_STRUCT(r300_vertex_stream_state);
     }

     /* Some non-CSO atoms don't use the state pointer. */
     r300->invariant_state.allow_null_state = TRUE;
     r300->fs_rc_constant_state.allow_null_state = TRUE;
     r300->pvs_flush.allow_null_state = TRUE;
     r300->query_start.allow_null_state = TRUE;
     r300->texture_cache_inval.allow_null_state = TRUE;
 }

 /* Not every state tracker calls every driver function before the first draw
  * call and we must initialize the command buffers somehow. */
 static void r300_init_states(struct pipe_context *pipe)
 {
     struct pipe_blend_color bc = {{0}};
     struct pipe_clip_state cs = {{{0}}};
     struct pipe_scissor_state ss = {0};
     struct r300_clip_state *clip =
             (struct r300_clip_state*)r300_context(pipe)->clip_state.state;
     CB_LOCALS;

     pipe->set_blend_color(pipe, &bc);
     pipe->set_scissor_state(pipe, &ss);

     if (r300_context(pipe)->screen->caps.has_tcl) {
         pipe->set_clip_state(pipe, &cs);
     } else {
         BEGIN_CB(clip->cb, 2);
         OUT_CB_REG(R300_VAP_CLIP_CNTL, R300_CLIP_DISABLE);
         END_CB;
     }
 }

 struct pipe_context* r300_create_context(struct pipe_screen* screen,
                                          void *priv)
 {
     struct r300_context* r300 = CALLOC_STRUCT(r300_context);
     struct r300_screen* r300screen = r300_screen(screen);
     struct r300_winsys_screen *rws = r300screen->rws;

     if (!r300)
         return NULL;

     r300->rws = rws;
     r300->screen = r300screen;

     r300->context.winsys = (struct pipe_winsys*)rws;
     r300->context.screen = screen;
     r300->context.priv = priv;

     r300->context.destroy = r300_destroy_context;

     if (!r300screen->caps.has_tcl) {
         /* Create a Draw. This is used for SW TCL. */
         r300->draw = draw_create(&r300->context);
         /* Enable our renderer. */
         draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
         /* Enable Draw's clipping. */
         draw_set_driver_clipping(r300->draw, FALSE);
         /* Disable converting points/lines to triangles. */
         draw_wide_line_threshold(r300->draw, 10000000.f);
         draw_wide_point_threshold(r300->draw, 10000000.f);
     }

     r300_setup_atoms(r300);

     make_empty_list(&r300->query_list);

     r300_init_blit_functions(r300);
     r300_init_flush_functions(r300);
     r300_init_query_functions(r300);
     r300_init_render_functions(r300);
     r300_init_state_functions(r300);
     r300_init_resource_functions(r300);

     r300->invariant_state.dirty = TRUE;

     rws->set_flush_cb(r300->rws, r300_flush_cb, r300);
     r300->dirty_hw++;

     r300->blitter = util_blitter_create(&r300->context);

     r300->upload_ib = u_upload_create(&r300->context,
 				      32 * 1024, 16,
 				      PIPE_BIND_INDEX_BUFFER);

     if (r300->upload_ib == NULL)
         goto no_upload_ib;

     r300->upload_vb = u_upload_create(&r300->context,
 				      128 * 1024, 16,
 				      PIPE_BIND_VERTEX_BUFFER);
     if (r300->upload_vb == NULL)
         goto no_upload_vb;

     r300->tran.translate_cache = translate_cache_create();

     r300_init_states(&r300->context);

     /* The KIL opcode needs the first texture unit to be enabled
      * on r3xx-r4xx. In order to calm down the CS checker, we bind this
      * dummy texture there. */
     if (!r300->screen->caps.is_r500) {
         struct pipe_resource *tex;
         struct pipe_resource rtempl = {{0}};
         struct pipe_sampler_view vtempl = {{0}};

         rtempl.target = PIPE_TEXTURE_2D;
         rtempl.format = PIPE_FORMAT_I8_UNORM;
         rtempl.bind = PIPE_BIND_SAMPLER_VIEW;
         rtempl.width0 = 1;
         rtempl.height0 = 1;
         rtempl.depth0 = 1;
         tex = screen->resource_create(screen, &rtempl);

         u_sampler_view_default_template(&vtempl, tex, tex->format);

         r300->texkill_sampler = (struct r300_sampler_view*)
             r300->context.create_sampler_view(&r300->context, tex, &vtempl);

         pipe_resource_reference(&tex, NULL);

         /* This will make sure that the dummy texture is set up
          * from the beginning even if an application does not use
          * textures. */
         r300->textures_state.dirty = TRUE;
     }

     return &r300->context;

  no_upload_ib:
     u_upload_destroy(r300->upload_ib);
  no_upload_vb:
     FREE(r300);
     return NULL;
 }

 boolean r300_check_cs(struct r300_context *r300, unsigned size)
 {
     return size <= r300->rws->get_cs_free_dwords(r300->rws);
 }

 void r300_finish(struct r300_context *r300)
 {
     struct pipe_framebuffer_state *fb;
     unsigned i;

     /* This is a preliminary implementation of glFinish.
      *
      * The ideal implementation should use something like EmitIrqLocked and
      * WaitIrq, or better, real fences.
      */
     if (r300->fb_state.state) {
         fb = r300->fb_state.state;

         for (i = 0; i < fb->nr_cbufs; i++) {
             if (fb->cbufs[i]->texture) {
                 r300->rws->buffer_wait(r300->rws,
                     r300_texture(fb->cbufs[i]->texture)->buffer);
                 return;
             }
         }
         if (fb->zsbuf && fb->zsbuf->texture) {
             r300->rws->buffer_wait(r300->rws,
                 r300_texture(fb->zsbuf->texture)->buffer);
         }
     }
 }
	/*
	* 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 "draw/draw_context.h"

	#include "util/u_memory.h"
	#include "util/u_sampler.h"
	#include "util/u_simple_list.h"
	#include "util/u_upload_mgr.h"

	#include "r300_cb.h"
	#include "r300_context.h"
	#include "r300_emit.h"
	#include "r300_screen.h"
	#include "r300_screen_buffer.h"
	#include "r300_state_invariant.h"
	#include "r300_winsys.h"

	#include <inttypes.h>

	static void r300_destroy_context(struct pipe_context* context)
	{
	struct r300_context* r300 = r300_context(context);
	struct r300_query query, temp;
	struct r300_atom *atom;

	if (r300->texkill_sampler) {
	pipe_sampler_view_reference(
	(struct pipe_sampler_view**)&r300->texkill_sampler,
	NULL);
	}

	util_blitter_destroy(r300->blitter);
	draw_destroy(r300->draw);

	/* Print stats, if enabled. */
	if (SCREEN_DBG_ON(r300->screen, DBG_STATS)) {
	fprintf(stderr, "r300: Stats for context %p:\n", r300);
	fprintf(stderr, " : Flushes: %" PRIu64 "\n", r300->flush_counter);
	foreach(atom, &r300->atom_list) {
	fprintf(stderr, " : %s: %" PRIu64 " emits\n",
	atom->name, atom->counter);
	}
	}

	/* If there are any queries pending or not destroyed, remove them now. */
	foreach_s(query, temp, &r300->query_list) {
	remove_from_list(query);
	FREE(query);
	}

	u_upload_destroy(r300->upload_vb);
	u_upload_destroy(r300->upload_ib);

	translate_cache_destroy(r300->tran.translate_cache);

	FREE(r300->blend_color_state.state);
	FREE(r300->clip_state.state);
	FREE(r300->fb_state.state);
	FREE(r300->rs_block_state.state);
	FREE(r300->scissor_state.state);
	FREE(r300->textures_state.state);
	FREE(r300->viewport_state.state);
	FREE(r300->ztop_state.state);
	FREE(r300->fs_constants.state);
	FREE(r300->vs_constants.state);
	if (!r300->screen->caps.has_tcl) {
	FREE(r300->vertex_stream_state.state);
	}
	FREE(r300);
	}

	static void r300_flush_cb(void *data)
	{
	struct r300_context* const cs_context_copy = data;

	cs_context_copy->context.flush(&cs_context_copy->context, 0, NULL);
	}

	#define R300_INIT_ATOM(atomname, atomsize) \
	r300->atomname.name = #atomname; \
	r300->atomname.state = NULL; \
	r300->atomname.size = atomsize; \
	r300->atomname.emit = r300_emit_##atomname; \
	r300->atomname.dirty = FALSE; \
	insert_at_tail(&r300->atom_list, &r300->atomname);

	static void r300_setup_atoms(struct r300_context* r300)
	{
	boolean is_r500 = r300->screen->caps.is_r500;
	boolean has_tcl = r300->screen->caps.has_tcl;

	/* Create the actual atom list.
	*
	* Each atom is examined and emitted in the order it appears here, which
	* can affect performance and conformance if not handled with care.
	*
	* Some atoms never change size, others change every emit - those have
	* the size of 0 here. */
	make_empty_list(&r300->atom_list);
	/* XXX unsorted. */
	R300_INIT_ATOM(invariant_state, 71);
	/* RB3D (unpipelined), ZB (unpipelined), US, SC. */
	R300_INIT_ATOM(fb_state, 0);
	R300_INIT_ATOM(ztop_state, 2);
	R300_INIT_ATOM(dsa_state, is_r500 ? 8 : 6);
	R300_INIT_ATOM(blend_state, 8);
	R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2);
	R300_INIT_ATOM(scissor_state, 3);
	/* VAP. */
	R300_INIT_ATOM(viewport_state, 9);
	R300_INIT_ATOM(pvs_flush, 2);
	R300_INIT_ATOM(vertex_stream_state, 0);
	R300_INIT_ATOM(vs_state, 0);
	R300_INIT_ATOM(vs_constants, 0);
	R300_INIT_ATOM(clip_state, has_tcl ? 5 + (6 * 4) : 2);
	/* VAP, RS, GA, GB. */
	R300_INIT_ATOM(rs_block_state, 0);
	R300_INIT_ATOM(rs_state, 0);
	/* US. */
	R300_INIT_ATOM(fs, 0);
	R300_INIT_ATOM(fs_rc_constant_state, 0);
	R300_INIT_ATOM(fs_constants, 0);
	/* TX. */
	R300_INIT_ATOM(texture_cache_inval, 2);
	R300_INIT_ATOM(textures_state, 0);
	/* ZB (unpipelined), SU. */
	R300_INIT_ATOM(query_start, 4);

	/* Replace emission functions for r500. */
	if (r300->screen->caps.is_r500) {
	r300->fs.emit = r500_emit_fs;
	r300->fs_rc_constant_state.emit = r500_emit_fs_rc_constant_state;
	r300->fs_constants.emit = r500_emit_fs_constants;
	}

	/* Some non-CSO atoms need explicit space to store the state locally. */
	r300->blend_color_state.state = CALLOC_STRUCT(r300_blend_color_state);
	r300->clip_state.state = CALLOC_STRUCT(r300_clip_state);
	r300->fb_state.state = CALLOC_STRUCT(pipe_framebuffer_state);
	r300->rs_block_state.state = CALLOC_STRUCT(r300_rs_block);
	r300->scissor_state.state = CALLOC_STRUCT(pipe_scissor_state);
	r300->textures_state.state = CALLOC_STRUCT(r300_textures_state);
	r300->viewport_state.state = CALLOC_STRUCT(r300_viewport_state);
	r300->ztop_state.state = CALLOC_STRUCT(r300_ztop_state);
	r300->fs_constants.state = CALLOC_STRUCT(r300_constant_buffer);
	r300->vs_constants.state = CALLOC_STRUCT(r300_constant_buffer);
	if (!r300->screen->caps.has_tcl) {
	r300->vertex_stream_state.state = CALLOC_STRUCT(r300_vertex_stream_state);
	}

	/* Some non-CSO atoms don't use the state pointer. */
	r300->invariant_state.allow_null_state = TRUE;
	r300->fs_rc_constant_state.allow_null_state = TRUE;
	r300->pvs_flush.allow_null_state = TRUE;
	r300->query_start.allow_null_state = TRUE;
	r300->texture_cache_inval.allow_null_state = TRUE;
	}

	/* Not every state tracker calls every driver function before the first draw
	* call and we must initialize the command buffers somehow. */
	static void r300_init_states(struct pipe_context *pipe)
	{
	struct pipe_blend_color bc = {{0}};
	struct pipe_clip_state cs = {{{0}}};
	struct pipe_scissor_state ss = {0};
	struct r300_clip_state *clip =
	(struct r300_clip_state*)r300_context(pipe)->clip_state.state;
	CB_LOCALS;

	pipe->set_blend_color(pipe, &bc);
	pipe->set_scissor_state(pipe, &ss);

	if (r300_context(pipe)->screen->caps.has_tcl) {
	pipe->set_clip_state(pipe, &cs);
	} else {
	BEGIN_CB(clip->cb, 2);
	OUT_CB_REG(R300_VAP_CLIP_CNTL, R300_CLIP_DISABLE);
	END_CB;
	}
	}

	struct pipe_context* r300_create_context(struct pipe_screen* screen,
	void *priv)
	{
	struct r300_context* r300 = CALLOC_STRUCT(r300_context);
	struct r300_screen* r300screen = r300_screen(screen);
	struct r300_winsys_screen *rws = r300screen->rws;

	if (!r300)
	return NULL;

	r300->rws = rws;
	r300->screen = r300screen;

	r300->context.winsys = (struct pipe_winsys*)rws;
	r300->context.screen = screen;
	r300->context.priv = priv;

	r300->context.destroy = r300_destroy_context;

	if (!r300screen->caps.has_tcl) {
	/* Create a Draw. This is used for SW TCL. */
	r300->draw = draw_create(&r300->context);
	/* Enable our renderer. */
	draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
	/* Enable Draw's clipping. */
	draw_set_driver_clipping(r300->draw, FALSE);
	/* Disable converting points/lines to triangles. */
	draw_wide_line_threshold(r300->draw, 10000000.f);
	draw_wide_point_threshold(r300->draw, 10000000.f);
	}

	r300_setup_atoms(r300);

	make_empty_list(&r300->query_list);

	r300_init_blit_functions(r300);
	r300_init_flush_functions(r300);
	r300_init_query_functions(r300);
	r300_init_render_functions(r300);
	r300_init_state_functions(r300);
	r300_init_resource_functions(r300);

	r300->invariant_state.dirty = TRUE;

	rws->set_flush_cb(r300->rws, r300_flush_cb, r300);
	r300->dirty_hw++;

	r300->blitter = util_blitter_create(&r300->context);

	r300->upload_ib = u_upload_create(&r300->context,
	32 * 1024, 16,
	PIPE_BIND_INDEX_BUFFER);

	if (r300->upload_ib == NULL)
	goto no_upload_ib;

	r300->upload_vb = u_upload_create(&r300->context,
	128 * 1024, 16,
	PIPE_BIND_VERTEX_BUFFER);
	if (r300->upload_vb == NULL)
	goto no_upload_vb;

	r300->tran.translate_cache = translate_cache_create();

	r300_init_states(&r300->context);

	/* The KIL opcode needs the first texture unit to be enabled
	* on r3xx-r4xx. In order to calm down the CS checker, we bind this
	* dummy texture there. */
	if (!r300->screen->caps.is_r500) {
	struct pipe_resource *tex;
	struct pipe_resource rtempl = {{0}};
	struct pipe_sampler_view vtempl = {{0}};

	rtempl.target = PIPE_TEXTURE_2D;
	rtempl.format = PIPE_FORMAT_I8_UNORM;
	rtempl.bind = PIPE_BIND_SAMPLER_VIEW;
	rtempl.width0 = 1;
	rtempl.height0 = 1;
	rtempl.depth0 = 1;
	tex = screen->resource_create(screen, &rtempl);

	u_sampler_view_default_template(&vtempl, tex, tex->format);

	r300->texkill_sampler = (struct r300_sampler_view*)
	r300->context.create_sampler_view(&r300->context, tex, &vtempl);

	pipe_resource_reference(&tex, NULL);

	/* This will make sure that the dummy texture is set up
	* from the beginning even if an application does not use
	* textures. */
	r300->textures_state.dirty = TRUE;
	}

	return &r300->context;

	no_upload_ib:
	u_upload_destroy(r300->upload_ib);
	no_upload_vb:
	FREE(r300);
	return NULL;
	}

	boolean r300_check_cs(struct r300_context *r300, unsigned size)
	{
	return size <= r300->rws->get_cs_free_dwords(r300->rws);
	}

	void r300_finish(struct r300_context *r300)
	{
	struct pipe_framebuffer_state *fb;
	unsigned i;

	/* This is a preliminary implementation of glFinish.
	*
	* The ideal implementation should use something like EmitIrqLocked and
	* WaitIrq, or better, real fences.
	*/
	if (r300->fb_state.state) {
	fb = r300->fb_state.state;

	for (i = 0; i < fb->nr_cbufs; i++) {
	if (fb->cbufs[i]->texture) {
	r300->rws->buffer_wait(r300->rws,
	r300_texture(fb->cbufs[i]->texture)->buffer);
	return;
	}
	}
	if (fb->zsbuf && fb->zsbuf->texture) {
	r300->rws->buffer_wait(r300->rws,
	r300_texture(fb->zsbuf->texture)->buffer);
	}
	}
	}