summaryrefslogtreecommitdiff
path: root/lib/mesa/src/gallium/drivers/r300/r300_context.c
diff options
context:
space:
mode:
authorJonathan Gray <jsg@cvs.openbsd.org>2015-11-22 02:46:45 +0000
committerJonathan Gray <jsg@cvs.openbsd.org>2015-11-22 02:46:45 +0000
commit0784c49c0f8fcc8b3abd4c9286d9fd8bc089dd7d (patch)
treea6394e3e264a0f80b57f4ce0f5d9526aa543d4b0 /lib/mesa/src/gallium/drivers/r300/r300_context.c
parentd91d0007eecf589ea5699e34aa4d748fce2c57b2 (diff)
import Mesa 11.0.6
Diffstat (limited to 'lib/mesa/src/gallium/drivers/r300/r300_context.c')
-rw-r--r--lib/mesa/src/gallium/drivers/r300/r300_context.c514
1 files changed, 514 insertions, 0 deletions
diff --git a/lib/mesa/src/gallium/drivers/r300/r300_context.c b/lib/mesa/src/gallium/drivers/r300/r300_context.c
new file mode 100644
index 000000000..8c24ad6d9
--- /dev/null
+++ b/lib/mesa/src/gallium/drivers/r300/r300_context.c
@@ -0,0 +1,514 @@
+/*
+ * 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/simple_list.h"
+#include "util/u_upload_mgr.h"
+#include "os/os_time.h"
+#include "vl/vl_decoder.h"
+#include "vl/vl_video_buffer.h"
+
+#include "r300_cb.h"
+#include "r300_context.h"
+#include "r300_emit.h"
+#include "r300_screen.h"
+#include "r300_screen_buffer.h"
+#include "compiler/radeon_regalloc.h"
+
+#include <inttypes.h>
+
+static void r300_release_referenced_objects(struct r300_context *r300)
+{
+ struct pipe_framebuffer_state *fb =
+ (struct pipe_framebuffer_state*)r300->fb_state.state;
+ struct r300_textures_state *textures =
+ (struct r300_textures_state*)r300->textures_state.state;
+ unsigned i;
+
+ /* Framebuffer state. */
+ util_unreference_framebuffer_state(fb);
+
+ /* Textures. */
+ for (i = 0; i < textures->sampler_view_count; i++)
+ pipe_sampler_view_reference(
+ (struct pipe_sampler_view**)&textures->sampler_views[i], NULL);
+
+ /* The special dummy texture for texkill. */
+ if (r300->texkill_sampler) {
+ pipe_sampler_view_reference(
+ (struct pipe_sampler_view**)&r300->texkill_sampler,
+ NULL);
+ }
+
+ /* Manually-created vertex buffers. */
+ pipe_resource_reference(&r300->dummy_vb.buffer, NULL);
+ pb_reference(&r300->vbo, NULL);
+
+ r300->context.delete_depth_stencil_alpha_state(&r300->context,
+ r300->dsa_decompress_zmask);
+}
+
+static void r300_destroy_context(struct pipe_context* context)
+{
+ struct r300_context* r300 = r300_context(context);
+
+ if (r300->cs && r300->hyperz_enabled) {
+ r300->rws->cs_request_feature(r300->cs, RADEON_FID_R300_HYPERZ_ACCESS, FALSE);
+ }
+ if (r300->cs && r300->cmask_access) {
+ r300->rws->cs_request_feature(r300->cs, RADEON_FID_R300_CMASK_ACCESS, FALSE);
+ }
+
+ if (r300->blitter)
+ util_blitter_destroy(r300->blitter);
+ if (r300->draw)
+ draw_destroy(r300->draw);
+
+ if (r300->uploader)
+ u_upload_destroy(r300->uploader);
+
+ /* XXX: This function assumes r300->query_list was initialized */
+ r300_release_referenced_objects(r300);
+
+ if (r300->cs)
+ r300->rws->cs_destroy(r300->cs);
+ if (r300->ctx)
+ r300->rws->ctx_destroy(r300->ctx);
+
+ rc_destroy_regalloc_state(&r300->fs_regalloc_state);
+
+ /* XXX: No way to tell if this was initialized or not? */
+ util_slab_destroy(&r300->pool_transfers);
+
+ /* Free the structs allocated in r300_setup_atoms() */
+ if (r300->aa_state.state) {
+ FREE(r300->aa_state.state);
+ FREE(r300->blend_color_state.state);
+ FREE(r300->clip_state.state);
+ FREE(r300->fb_state.state);
+ FREE(r300->gpu_flush.state);
+ FREE(r300->hyperz_state.state);
+ FREE(r300->invariant_state.state);
+ FREE(r300->rs_block_state.state);
+ FREE(r300->sample_mask.state);
+ FREE(r300->scissor_state.state);
+ FREE(r300->textures_state.state);
+ FREE(r300->vap_invariant_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_callback(void *data, unsigned flags,
+ struct pipe_fence_handle **fence)
+{
+ struct r300_context* const cs_context_copy = data;
+
+ r300_flush(&cs_context_copy->context, flags, fence);
+}
+
+#define R300_INIT_ATOM(atomname, atomsize) \
+ do { \
+ r300->atomname.name = #atomname; \
+ r300->atomname.state = NULL; \
+ r300->atomname.size = atomsize; \
+ r300->atomname.emit = r300_emit_##atomname; \
+ r300->atomname.dirty = FALSE; \
+ } while (0)
+
+#define R300_ALLOC_ATOM(atomname, statetype) \
+do { \
+ r300->atomname.state = CALLOC_STRUCT(statetype); \
+ if (r300->atomname.state == NULL) \
+ return FALSE; \
+} while (0)
+
+static boolean r300_setup_atoms(struct r300_context* r300)
+{
+ boolean is_rv350 = r300->screen->caps.is_rv350;
+ boolean is_r500 = r300->screen->caps.is_r500;
+ boolean has_tcl = r300->screen->caps.has_tcl;
+ boolean drm_2_6_0 = r300->screen->info.drm_minor >= 6;
+
+ /* Create the actual atom list.
+ *
+ * Some atoms never change size, others change every emit - those have
+ * the size of 0 here.
+ *
+ * NOTE: The framebuffer state is split into these atoms:
+ * - gpu_flush (unpipelined regs)
+ * - aa_state (unpipelined regs)
+ * - fb_state (unpipelined regs)
+ * - hyperz_state (unpipelined regs followed by pipelined ones)
+ * - fb_state_pipelined (pipelined regs)
+ * The motivation behind this is to be able to emit a strict
+ * subset of the regs, and to have reasonable register ordering. */
+ /* SC, GB (unpipelined), RB3D (unpipelined), ZB (unpipelined). */
+ R300_INIT_ATOM(gpu_flush, 9);
+ R300_INIT_ATOM(aa_state, 4);
+ R300_INIT_ATOM(fb_state, 0);
+ R300_INIT_ATOM(hyperz_state, is_r500 || (is_rv350 && drm_2_6_0) ? 10 : 8);
+ /* ZB (unpipelined), SC. */
+ R300_INIT_ATOM(ztop_state, 2);
+ /* ZB, FG. */
+ R300_INIT_ATOM(dsa_state, is_r500 ? (drm_2_6_0 ? 10 : 8) : 6);
+ /* RB3D. */
+ R300_INIT_ATOM(blend_state, 8);
+ R300_INIT_ATOM(blend_color_state, is_r500 ? 3 : 2);
+ /* SC. */
+ R300_INIT_ATOM(sample_mask, 2);
+ R300_INIT_ATOM(scissor_state, 3);
+ /* GB, FG, GA, SU, SC, RB3D. */
+ R300_INIT_ATOM(invariant_state, 14 + (is_rv350 ? 4 : 0) + (is_r500 ? 4 : 0));
+ /* VAP. */
+ R300_INIT_ATOM(viewport_state, 9);
+ R300_INIT_ATOM(pvs_flush, 2);
+ R300_INIT_ATOM(vap_invariant_state, is_r500 ? 11 : 9);
+ 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 ? 3 + (6 * 4) : 0);
+ /* VAP, RS, GA, GB, SU, SC. */
+ R300_INIT_ATOM(rs_block_state, 0);
+ R300_INIT_ATOM(rs_state, 0);
+ /* SC, US. */
+ R300_INIT_ATOM(fb_state_pipelined, 8);
+ /* 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);
+ /* Clear commands */
+ R300_INIT_ATOM(hiz_clear, r300->screen->caps.hiz_ram > 0 ? 4 : 0);
+ R300_INIT_ATOM(zmask_clear, r300->screen->caps.zmask_ram > 0 ? 4 : 0);
+ R300_INIT_ATOM(cmask_clear, 4);
+ /* ZB (unpipelined), SU. */
+ R300_INIT_ATOM(query_start, 4);
+
+ /* Replace emission functions for r500. */
+ if (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_ALLOC_ATOM(aa_state, r300_aa_state);
+ R300_ALLOC_ATOM(blend_color_state, r300_blend_color_state);
+ R300_ALLOC_ATOM(clip_state, r300_clip_state);
+ R300_ALLOC_ATOM(hyperz_state, r300_hyperz_state);
+ R300_ALLOC_ATOM(invariant_state, r300_invariant_state);
+ R300_ALLOC_ATOM(textures_state, r300_textures_state);
+ R300_ALLOC_ATOM(vap_invariant_state, r300_vap_invariant_state);
+ R300_ALLOC_ATOM(viewport_state, r300_viewport_state);
+ R300_ALLOC_ATOM(ztop_state, r300_ztop_state);
+ R300_ALLOC_ATOM(fb_state, pipe_framebuffer_state);
+ R300_ALLOC_ATOM(gpu_flush, pipe_framebuffer_state);
+ r300->sample_mask.state = malloc(4);
+ R300_ALLOC_ATOM(scissor_state, pipe_scissor_state);
+ R300_ALLOC_ATOM(rs_block_state, r300_rs_block);
+ R300_ALLOC_ATOM(fs_constants, r300_constant_buffer);
+ R300_ALLOC_ATOM(vs_constants, r300_constant_buffer);
+ if (!r300->screen->caps.has_tcl) {
+ R300_ALLOC_ATOM(vertex_stream_state, r300_vertex_stream_state);
+ }
+
+ /* Some non-CSO atoms don't use the state pointer. */
+ r300->fb_state_pipelined.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;
+
+ /* Some states must be marked as dirty here to properly set up
+ * hardware in the first command stream. */
+ r300_mark_atom_dirty(r300, &r300->invariant_state);
+ r300_mark_atom_dirty(r300, &r300->pvs_flush);
+ r300_mark_atom_dirty(r300, &r300->vap_invariant_state);
+ r300_mark_atom_dirty(r300, &r300->texture_cache_inval);
+ r300_mark_atom_dirty(r300, &r300->textures_state);
+
+ return 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 r300_context *r300 = r300_context(pipe);
+ struct pipe_blend_color bc = {{0}};
+ struct pipe_clip_state cs = {{{0}}};
+ struct pipe_scissor_state ss = {0};
+ struct r300_gpu_flush *gpuflush =
+ (struct r300_gpu_flush*)r300->gpu_flush.state;
+ struct r300_vap_invariant_state *vap_invariant =
+ (struct r300_vap_invariant_state*)r300->vap_invariant_state.state;
+ struct r300_invariant_state *invariant =
+ (struct r300_invariant_state*)r300->invariant_state.state;
+
+ CB_LOCALS;
+
+ pipe->set_blend_color(pipe, &bc);
+ pipe->set_clip_state(pipe, &cs);
+ pipe->set_scissor_states(pipe, 0, 1, &ss);
+ pipe->set_sample_mask(pipe, ~0);
+
+ /* Initialize the GPU flush. */
+ {
+ BEGIN_CB(gpuflush->cb_flush_clean, 6);
+
+ /* Flush and free renderbuffer caches. */
+ OUT_CB_REG(R300_RB3D_DSTCACHE_CTLSTAT,
+ R300_RB3D_DSTCACHE_CTLSTAT_DC_FREE_FREE_3D_TAGS |
+ R300_RB3D_DSTCACHE_CTLSTAT_DC_FLUSH_FLUSH_DIRTY_3D);
+ OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
+ R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE |
+ R300_ZB_ZCACHE_CTLSTAT_ZC_FREE_FREE);
+
+ /* Wait until the GPU is idle.
+ * This fixes random pixels sometimes appearing probably caused
+ * by incomplete rendering. */
+ OUT_CB_REG(RADEON_WAIT_UNTIL, RADEON_WAIT_3D_IDLECLEAN);
+ END_CB;
+ }
+
+ /* Initialize the VAP invariant state. */
+ {
+ BEGIN_CB(vap_invariant->cb, r300->vap_invariant_state.size);
+ OUT_CB_REG(VAP_PVS_VTX_TIMEOUT_REG, 0xffff);
+ OUT_CB_REG_SEQ(R300_VAP_GB_VERT_CLIP_ADJ, 4);
+ OUT_CB_32F(1.0);
+ OUT_CB_32F(1.0);
+ OUT_CB_32F(1.0);
+ OUT_CB_32F(1.0);
+ OUT_CB_REG(R300_VAP_PSC_SGN_NORM_CNTL, R300_SGN_NORM_NO_ZERO);
+
+ if (r300->screen->caps.is_r500) {
+ OUT_CB_REG(R500_VAP_TEX_TO_COLOR_CNTL, 0);
+ }
+ END_CB;
+ }
+
+ /* Initialize the invariant state. */
+ {
+ BEGIN_CB(invariant->cb, r300->invariant_state.size);
+ OUT_CB_REG(R300_GB_SELECT, 0);
+ OUT_CB_REG(R300_FG_FOG_BLEND, 0);
+ OUT_CB_REG(R300_GA_OFFSET, 0);
+ OUT_CB_REG(R300_SU_TEX_WRAP, 0);
+ OUT_CB_REG(R300_SU_DEPTH_SCALE, 0x4B7FFFFF);
+ OUT_CB_REG(R300_SU_DEPTH_OFFSET, 0);
+ OUT_CB_REG(R300_SC_EDGERULE, 0x2DA49525);
+
+ if (r300->screen->caps.is_rv350) {
+ OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_LTE_THRESHOLD, 0x01010101);
+ OUT_CB_REG(R500_RB3D_DISCARD_SRC_PIXEL_GTE_THRESHOLD, 0xFEFEFEFE);
+ }
+
+ if (r300->screen->caps.is_r500) {
+ OUT_CB_REG(R500_GA_COLOR_CONTROL_PS3, 0);
+ OUT_CB_REG(R500_SU_TEX_WRAP_PS3, 0);
+ }
+ END_CB;
+ }
+
+ /* Initialize the hyperz state. */
+ {
+ struct r300_hyperz_state *hyperz =
+ (struct r300_hyperz_state*)r300->hyperz_state.state;
+ BEGIN_CB(&hyperz->cb_flush_begin, r300->hyperz_state.size);
+ OUT_CB_REG(R300_ZB_ZCACHE_CTLSTAT,
+ R300_ZB_ZCACHE_CTLSTAT_ZC_FLUSH_FLUSH_AND_FREE);
+ OUT_CB_REG(R300_ZB_BW_CNTL, 0);
+ OUT_CB_REG(R300_ZB_DEPTHCLEARVALUE, 0);
+ OUT_CB_REG(R300_SC_HYPERZ, R300_SC_HYPERZ_ADJ_2);
+
+ if (r300->screen->caps.is_r500 ||
+ (r300->screen->caps.is_rv350 &&
+ r300->screen->info.drm_minor >= 6)) {
+ OUT_CB_REG(R300_GB_Z_PEQ_CONFIG, 0);
+ }
+ 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 radeon_winsys *rws = r300screen->rws;
+
+ if (!r300)
+ return NULL;
+
+ r300->rws = rws;
+ r300->screen = r300screen;
+
+ r300->context.screen = screen;
+ r300->context.priv = priv;
+
+ r300->context.destroy = r300_destroy_context;
+
+ util_slab_create(&r300->pool_transfers,
+ sizeof(struct pipe_transfer), 64,
+ UTIL_SLAB_SINGLETHREADED);
+
+ r300->ctx = rws->ctx_create(rws);
+ if (!r300->ctx)
+ goto fail;
+
+ r300->cs = rws->cs_create(r300->ctx, RING_GFX, r300_flush_callback, r300, NULL);
+ if (r300->cs == NULL)
+ goto fail;
+
+ if (!r300screen->caps.has_tcl) {
+ /* Create a Draw. This is used for SW TCL. */
+ r300->draw = draw_create(&r300->context);
+ if (r300->draw == NULL)
+ goto fail;
+ /* Enable our renderer. */
+ draw_set_rasterize_stage(r300->draw, r300_draw_stage(r300));
+ /* Disable converting points/lines to triangles. */
+ draw_wide_line_threshold(r300->draw, 10000000.f);
+ draw_wide_point_threshold(r300->draw, 10000000.f);
+ draw_wide_point_sprites(r300->draw, FALSE);
+ draw_enable_line_stipple(r300->draw, TRUE);
+ draw_enable_point_sprites(r300->draw, FALSE);
+ }
+
+ if (!r300_setup_atoms(r300))
+ goto fail;
+
+ r300_init_blit_functions(r300);
+ r300_init_flush_functions(r300);
+ r300_init_query_functions(r300);
+ r300_init_state_functions(r300);
+ r300_init_resource_functions(r300);
+ r300_init_render_functions(r300);
+ r300_init_states(&r300->context);
+
+ r300->context.create_video_codec = vl_create_decoder;
+ r300->context.create_video_buffer = vl_video_buffer_create;
+
+ r300->uploader = u_upload_create(&r300->context, 256 * 1024, 4,
+ PIPE_BIND_CUSTOM);
+
+ r300->blitter = util_blitter_create(&r300->context);
+ if (r300->blitter == NULL)
+ goto fail;
+ r300->blitter->draw_rectangle = r300_blitter_draw_rectangle;
+
+ /* 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.usage = PIPE_USAGE_IMMUTABLE;
+ 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);
+ }
+
+ if (r300screen->caps.has_tcl) {
+ struct pipe_resource vb;
+ memset(&vb, 0, sizeof(vb));
+ vb.target = PIPE_BUFFER;
+ vb.format = PIPE_FORMAT_R8_UNORM;
+ vb.usage = PIPE_USAGE_DEFAULT;
+ vb.width0 = sizeof(float) * 16;
+ vb.height0 = 1;
+ vb.depth0 = 1;
+
+ r300->dummy_vb.buffer = screen->resource_create(screen, &vb);
+ r300->context.set_vertex_buffers(&r300->context, 0, 1, &r300->dummy_vb);
+ }
+
+ {
+ struct pipe_depth_stencil_alpha_state dsa;
+ memset(&dsa, 0, sizeof(dsa));
+ dsa.depth.writemask = 1;
+
+ r300->dsa_decompress_zmask =
+ r300->context.create_depth_stencil_alpha_state(&r300->context,
+ &dsa);
+ }
+
+ r300->hyperz_time_of_last_flush = os_time_get();
+
+ /* Register allocator state */
+ rc_init_regalloc_state(&r300->fs_regalloc_state);
+
+ /* Print driver info. */
+#ifdef DEBUG
+ {
+#else
+ if (DBG_ON(r300, DBG_INFO)) {
+#endif
+ fprintf(stderr,
+ "r300: DRM version: %d.%d.%d, Name: %s, ID: 0x%04x, GB: %d, Z: %d\n"
+ "r300: GART size: %"PRIu64" MB, VRAM size: %"PRIu64" MB\n"
+ "r300: AA compression RAM: %s, Z compression RAM: %s, HiZ RAM: %s\n",
+ r300->screen->info.drm_major,
+ r300->screen->info.drm_minor,
+ r300->screen->info.drm_patchlevel,
+ screen->get_name(screen),
+ r300->screen->info.pci_id,
+ r300->screen->info.r300_num_gb_pipes,
+ r300->screen->info.r300_num_z_pipes,
+ r300->screen->info.gart_size >> 20,
+ r300->screen->info.vram_size >> 20,
+ "YES", /* XXX really? */
+ r300->screen->caps.zmask_ram ? "YES" : "NO",
+ r300->screen->caps.hiz_ram ? "YES" : "NO");
+ }
+
+ return &r300->context;
+
+fail:
+ r300_destroy_context(&r300->context);
+ return NULL;
+}