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Copyright (C) Intel Corp. 2006. All Rights Reserved.
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Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
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develop this 3D driver.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice (including the
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next paragraph) shall be included in all copies or substantial
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portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**********************************************************************/
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* Keith Whitwell <keith@tungstengraphics.com>
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#include "shader/prog_parameter.h"
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#include "shader/prog_statevars.h"
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#include "intel_batchbuffer.h"
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#include "brw_context.h"
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#include "brw_defines.h"
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#include "brw_state.h"
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/* Partition the CURBE between the various users of constant values:
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static void calculate_curbe_offsets( struct brw_context *brw )
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/* CACHE_NEW_WM_PROG */
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GLuint nr_fp_regs = (brw->wm.prog_data->nr_params + 15) / 16;
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/* BRW_NEW_VERTEX_PROGRAM */
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struct brw_vertex_program *vp = (struct brw_vertex_program *)brw->vertex_program;
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GLuint nr_vp_regs = (vp->program.Base.Parameters->NumParameters * 4 + 15) / 16;
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GLuint nr_clip_regs = 0;
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if (brw->attribs.Transform->ClipPlanesEnabled) {
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GLuint nr_planes = 6 + brw_count_bits(brw->attribs.Transform->ClipPlanesEnabled);
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nr_clip_regs = (nr_planes * 4 + 15) / 16;
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total_regs = nr_fp_regs + nr_vp_regs + nr_clip_regs;
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/* This can happen - what to do? Probably rather than falling
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* back, the best thing to do is emit programs which code the
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* constants as immediate values. Could do this either as a static
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* cap on WM and VS, or adaptively.
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* Unfortunately, this is currently dependent on the results of the
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* program generation process (in the case of wm), so this would
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* introduce the need to re-generate programs in the event of a
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* curbe allocation failure.
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/* Max size is 32 - just large enough to
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* hold the 128 parameters allowed by
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* the fragment and vertex program
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* api's. It's not clear what happens
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* when both VP and FP want to use 128
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assert(total_regs <= 32);
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if (nr_fp_regs > brw->curbe.wm_size ||
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nr_vp_regs > brw->curbe.vs_size ||
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nr_clip_regs != brw->curbe.clip_size ||
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(total_regs < brw->curbe.total_size / 4 &&
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brw->curbe.total_size > 16)) {
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/* Calculate a new layout:
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brw->curbe.wm_start = reg;
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brw->curbe.wm_size = nr_fp_regs; reg += nr_fp_regs;
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brw->curbe.clip_start = reg;
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brw->curbe.clip_size = nr_clip_regs; reg += nr_clip_regs;
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brw->curbe.vs_start = reg;
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brw->curbe.vs_size = nr_vp_regs; reg += nr_vp_regs;
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brw->curbe.total_size = reg;
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_mesa_printf("curbe wm %d+%d clip %d+%d vs %d+%d\n",
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brw->curbe.clip_start,
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brw->curbe.clip_size,
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brw->curbe.vs_size );
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brw->state.dirty.brw |= BRW_NEW_CURBE_OFFSETS;
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const struct brw_tracked_state brw_curbe_offsets = {
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.mesa = _NEW_TRANSFORM,
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.brw = BRW_NEW_VERTEX_PROGRAM,
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.cache = CACHE_NEW_WM_PROG
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.update = calculate_curbe_offsets
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/* Define the number of curbes within CS's urb allocation. Multiple
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* urb entries -> multiple curbes. These will be used by
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* fixed-function hardware in a double-buffering scheme to avoid a
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* pipeline stall each time the contents of the curbe is changed.
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void brw_upload_constant_buffer_state(struct brw_context *brw)
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struct brw_constant_buffer_state cbs;
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memset(&cbs, 0, sizeof(cbs));
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/* It appears that this is the state packet for the CS unit, ie. the
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* urb entries detailed here are housed in the CS range from the
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cbs.header.opcode = CMD_CONST_BUFFER_STATE;
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cbs.header.length = sizeof(cbs)/4 - 2;
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/* BRW_NEW_URB_FENCE */
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cbs.bits0.nr_urb_entries = brw->urb.nr_cs_entries;
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cbs.bits0.urb_entry_size = brw->urb.csize - 1;
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assert(brw->urb.nr_cs_entries);
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BRW_CACHED_BATCH_STRUCT(brw, &cbs);
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const struct brw_tracked_state brw_constant_buffer_state = {
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.brw = BRW_NEW_URB_FENCE,
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.update = brw_upload_constant_buffer_state
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static GLfloat fixed_plane[6][4] = {
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/* Upload a new set of constants. Too much variability to go into the
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* cache mechanism, but maybe would benefit from a comparison against
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* the current uploaded set of constants.
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static void upload_constant_buffer(struct brw_context *brw)
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GLcontext *ctx = &brw->intel.ctx;
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struct brw_vertex_program *vp = (struct brw_vertex_program *)brw->vertex_program;
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struct brw_fragment_program *fp = (struct brw_fragment_program *)brw->fragment_program;
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struct brw_mem_pool *pool = &brw->pool[BRW_GS_POOL];
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GLuint sz = brw->curbe.total_size;
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GLuint bufsz = sz * 16 * sizeof(GLfloat);
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/* Update our own dependency flags. This works because this
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* function will also be called whenever fp or vp changes.
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brw->curbe.tracked_state.dirty.mesa = (_NEW_TRANSFORM|_NEW_PROJECTION);
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brw->curbe.tracked_state.dirty.mesa |= vp->param_state;
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brw->curbe.tracked_state.dirty.mesa |= fp->param_state;
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struct brw_constant_buffer cb;
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cb.header.opcode = CMD_CONST_BUFFER;
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cb.header.length = sizeof(cb)/4 - 2;
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cb.bits0.buffer_length = 0;
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cb.bits0.buffer_address = 0;
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BRW_BATCH_STRUCT(brw, &cb);
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if (brw->curbe.last_buf) {
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free(brw->curbe.last_buf);
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brw->curbe.last_buf = NULL;
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brw->curbe.last_bufsz = 0;
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buf = (GLfloat *)malloc(bufsz);
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memset(buf, 0, bufsz);
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if (brw->curbe.wm_size) {
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GLuint offset = brw->curbe.wm_start * 16;
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_mesa_load_state_parameters(ctx, fp->program.Base.Parameters);
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for (i = 0; i < brw->wm.prog_data->nr_params; i++)
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buf[offset + i] = brw->wm.prog_data->param[i][0];
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/* The clipplanes are actually delivered to both CLIP and VS units.
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* VS uses them to calculate the outcode bitmasks.
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if (brw->curbe.clip_size) {
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GLuint offset = brw->curbe.clip_start * 16;
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/* If any planes are going this way, send them all this way:
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for (i = 0; i < 6; i++) {
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buf[offset + i * 4 + 0] = fixed_plane[i][0];
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buf[offset + i * 4 + 1] = fixed_plane[i][1];
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buf[offset + i * 4 + 2] = fixed_plane[i][2];
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buf[offset + i * 4 + 3] = fixed_plane[i][3];
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/* Clip planes: _NEW_TRANSFORM plus _NEW_PROJECTION to get to
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assert(MAX_CLIP_PLANES == 6);
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for (j = 0; j < MAX_CLIP_PLANES; j++) {
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if (brw->attribs.Transform->ClipPlanesEnabled & (1<<j)) {
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buf[offset + i * 4 + 0] = brw->attribs.Transform->_ClipUserPlane[j][0];
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buf[offset + i * 4 + 1] = brw->attribs.Transform->_ClipUserPlane[j][1];
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buf[offset + i * 4 + 2] = brw->attribs.Transform->_ClipUserPlane[j][2];
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buf[offset + i * 4 + 3] = brw->attribs.Transform->_ClipUserPlane[j][3];
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if (brw->curbe.vs_size) {
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GLuint offset = brw->curbe.vs_start * 16;
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GLuint nr = vp->program.Base.Parameters->NumParameters;
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_mesa_load_state_parameters(ctx, vp->program.Base.Parameters);
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for (i = 0; i < nr; i++) {
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buf[offset + i * 4 + 0] = vp->program.Base.Parameters->ParameterValues[i][0];
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buf[offset + i * 4 + 1] = vp->program.Base.Parameters->ParameterValues[i][1];
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buf[offset + i * 4 + 2] = vp->program.Base.Parameters->ParameterValues[i][2];
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buf[offset + i * 4 + 3] = vp->program.Base.Parameters->ParameterValues[i][3];
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for (i = 0; i < sz*16; i+=4)
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_mesa_printf("curbe %d.%d: %f %f %f %f\n", i/8, i&4,
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buf[i+0], buf[i+1], buf[i+2], buf[i+3]);
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_mesa_printf("last_buf %p buf %p sz %d/%d cmp %d\n",
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brw->curbe.last_buf, buf,
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bufsz, brw->curbe.last_bufsz,
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brw->curbe.last_buf ? memcmp(buf, brw->curbe.last_buf, bufsz) : -1);
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if (brw->curbe.last_buf &&
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bufsz == brw->curbe.last_bufsz &&
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memcmp(buf, brw->curbe.last_buf, bufsz) == 0) {
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if (brw->curbe.last_buf)
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free(brw->curbe.last_buf);
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brw->curbe.last_buf = buf;
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brw->curbe.last_bufsz = bufsz;
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if (!brw_pool_alloc(pool,
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&brw->curbe.gs_offset)) {
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_mesa_printf("out of GS memory for curbe\n");
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/* Copy data to the buffer:
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bmBufferSubDataAUB(&brw->intel,
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brw->curbe.gs_offset,
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/* TODO: only emit the constant_buffer packet when necessary, ie:
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- contents have changed
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- hw requirements due to other packets emitted.
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struct brw_constant_buffer cb;
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memset(&cb, 0, sizeof(cb));
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cb.header.opcode = CMD_CONST_BUFFER;
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cb.header.length = sizeof(cb)/4 - 2;
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cb.bits0.buffer_length = sz - 1;
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cb.bits0.buffer_address = brw->curbe.gs_offset >> 6;
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/* Because this provokes an action (ie copy the constants into the
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* URB), it shouldn't be shortcircuited if identical to the
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* previous time - because eg. the urb destination may have
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* changed, or the urb contents different to last time.
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* Note that the data referred to is actually copied internally,
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* not just used in place according to passed pointer.
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* It appears that the CS unit takes care of using each available
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* URB entry (Const URB Entry == CURBE) in turn, and issuing
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* flushes as necessary when doublebuffering of CURBEs isn't
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/* intel_batchbuffer_align(brw->intel.batch, 64, sizeof(cb)); */
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BRW_BATCH_STRUCT(brw, &cb);
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/* intel_batchbuffer_align(brw->intel.batch, 64, 0); */
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/* This tracked state is unique in that the state it monitors varies
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* dynamically depending on the parameters tracked by the fragment and
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* vertex programs. This is the template used as a starting point,
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* each context will maintain a copy of this internally and update as
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const struct brw_tracked_state brw_constant_buffer = {
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.mesa = (_NEW_TRANSFORM|_NEW_PROJECTION), /* plus fp and vp flags */
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.brw = (BRW_NEW_FRAGMENT_PROGRAM |
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BRW_NEW_VERTEX_PROGRAM |
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BRW_NEW_URB_FENCE | /* Implicit - hardware requires this, not used above */
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BRW_NEW_PSP | /* Implicit - hardware requires this, not used above */
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BRW_NEW_CURBE_OFFSETS),
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.cache = (CACHE_NEW_WM_PROG)
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.update = upload_constant_buffer