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Diffstat (limited to 'src/gallium/drivers/i965/brw_curbe.c')
-rw-r--r--src/gallium/drivers/i965/brw_curbe.c390
1 files changed, 390 insertions, 0 deletions
diff --git a/src/gallium/drivers/i965/brw_curbe.c b/src/gallium/drivers/i965/brw_curbe.c
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+/*
+ Copyright (C) Intel Corp. 2006. All Rights Reserved.
+ Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
+ develop this 3D driver.
+
+ 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, sublicense, 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 NONINFRINGEMENT.
+ IN NO EVENT SHALL THE COPYRIGHT OWNER(S) 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.
+
+ **********************************************************************/
+ /*
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "util/u_memory.h"
+#include "util/u_math.h"
+
+#include "brw_batchbuffer.h"
+#include "brw_context.h"
+#include "brw_defines.h"
+#include "brw_state.h"
+#include "brw_util.h"
+#include "brw_debug.h"
+#include "brw_screen.h"
+
+
+/**
+ * Partition the CURBE between the various users of constant values:
+ * Note that vertex and fragment shaders can now fetch constants out
+ * of constant buffers. We no longer allocatea block of the GRF for
+ * constants. That greatly reduces the demand for space in the CURBE.
+ * Some of the comments within are dated...
+ */
+static int calculate_curbe_offsets( struct brw_context *brw )
+{
+ /* CACHE_NEW_WM_PROG */
+ const GLuint nr_fp_regs = brw->wm.prog_data->curb_read_length;
+
+ /* BRW_NEW_VERTEX_PROGRAM */
+ const GLuint nr_vp_regs = brw->vs.prog_data->curb_read_length;
+ GLuint nr_clip_regs = 0;
+ GLuint total_regs;
+
+ /* PIPE_NEW_CLIP */
+ if (brw->curr.ucp.nr) {
+ GLuint nr_planes = 6 + brw->curr.ucp.nr;
+ nr_clip_regs = (nr_planes * 4 + 15) / 16;
+ }
+
+
+ total_regs = nr_fp_regs + nr_vp_regs + nr_clip_regs;
+
+ /* When this is > 32, want to use a true constant buffer to hold
+ * the extra constants.
+ */
+ assert(total_regs <= 32);
+
+ /* Lazy resize:
+ */
+ if (nr_fp_regs > brw->curbe.wm_size ||
+ nr_vp_regs > brw->curbe.vs_size ||
+ nr_clip_regs != brw->curbe.clip_size ||
+ (total_regs < brw->curbe.total_size / 4 &&
+ brw->curbe.total_size > 16)) {
+
+ GLuint reg = 0;
+
+ /* Calculate a new layout:
+ */
+ reg = 0;
+ brw->curbe.wm_start = reg;
+ brw->curbe.wm_size = nr_fp_regs; reg += nr_fp_regs;
+ brw->curbe.clip_start = reg;
+ brw->curbe.clip_size = nr_clip_regs; reg += nr_clip_regs;
+ brw->curbe.vs_start = reg;
+ brw->curbe.vs_size = nr_vp_regs; reg += nr_vp_regs;
+ brw->curbe.total_size = reg;
+
+ if (BRW_DEBUG & DEBUG_CURBE)
+ debug_printf("curbe wm %d+%d clip %d+%d vs %d+%d\n",
+ brw->curbe.wm_start,
+ brw->curbe.wm_size,
+ brw->curbe.clip_start,
+ brw->curbe.clip_size,
+ brw->curbe.vs_start,
+ brw->curbe.vs_size );
+
+ brw->state.dirty.brw |= BRW_NEW_CURBE_OFFSETS;
+ }
+
+ return 0;
+}
+
+
+const struct brw_tracked_state brw_curbe_offsets = {
+ .dirty = {
+ .mesa = PIPE_NEW_CLIP,
+ .brw = BRW_NEW_VERTEX_PROGRAM,
+ .cache = CACHE_NEW_WM_PROG
+ },
+ .prepare = calculate_curbe_offsets
+};
+
+
+
+
+/* Define the number of curbes within CS's urb allocation. Multiple
+ * urb entries -> multiple curbes. These will be used by
+ * fixed-function hardware in a double-buffering scheme to avoid a
+ * pipeline stall each time the contents of the curbe is changed.
+ */
+int brw_upload_cs_urb_state(struct brw_context *brw)
+{
+ struct brw_cs_urb_state cs_urb;
+ memset(&cs_urb, 0, sizeof(cs_urb));
+
+ /* It appears that this is the state packet for the CS unit, ie. the
+ * urb entries detailed here are housed in the CS range from the
+ * URB_FENCE command.
+ */
+ cs_urb.header.opcode = CMD_CS_URB_STATE;
+ cs_urb.header.length = sizeof(cs_urb)/4 - 2;
+
+ /* BRW_NEW_URB_FENCE */
+ cs_urb.bits0.nr_urb_entries = brw->urb.nr_cs_entries;
+ cs_urb.bits0.urb_entry_size = brw->urb.csize - 1;
+
+ assert(brw->urb.nr_cs_entries);
+ BRW_CACHED_BATCH_STRUCT(brw, &cs_urb);
+ return 0;
+}
+
+static GLfloat fixed_plane[6][4] = {
+ { 0, 0, -1, 1 },
+ { 0, 0, 1, 1 },
+ { 0, -1, 0, 1 },
+ { 0, 1, 0, 1 },
+ {-1, 0, 0, 1 },
+ { 1, 0, 0, 1 }
+};
+
+/* Upload a new set of constants. Too much variability to go into the
+ * cache mechanism, but maybe would benefit from a comparison against
+ * the current uploaded set of constants.
+ */
+static enum pipe_error prepare_curbe_buffer(struct brw_context *brw)
+{
+ struct pipe_screen *screen = brw->base.screen;
+ const GLuint sz = brw->curbe.total_size;
+ const GLuint bufsz = sz * 16 * sizeof(GLfloat);
+ enum pipe_error ret;
+ GLfloat *buf;
+ GLuint i;
+
+ if (sz == 0) {
+ if (brw->curbe.last_buf) {
+ free(brw->curbe.last_buf);
+ brw->curbe.last_buf = NULL;
+ brw->curbe.last_bufsz = 0;
+ }
+ return 0;
+ }
+
+ buf = (GLfloat *) CALLOC(bufsz, 1);
+
+ /* fragment shader constants */
+ if (brw->curbe.wm_size) {
+ const struct brw_fragment_shader *fs = brw->curr.fragment_shader;
+ GLuint offset = brw->curbe.wm_start * 16;
+ GLuint nr_immediate, nr_const;
+
+ nr_immediate = fs->immediates.nr;
+ if (nr_immediate) {
+ memcpy(&buf[offset],
+ fs->immediates.data,
+ nr_immediate * 4 * sizeof(float));
+
+ offset += nr_immediate * 4;
+ }
+
+ nr_const = fs->info.file_max[TGSI_FILE_CONSTANT] + 1;
+/* nr_const = brw->wm.prog_data->nr_params; */
+ if (nr_const) {
+ const GLfloat *value = screen->buffer_map( screen,
+ brw->curr.fragment_constants,
+ PIPE_BUFFER_USAGE_CPU_READ);
+
+ memcpy(&buf[offset], value,
+ nr_const * 4 * sizeof(float));
+
+ screen->buffer_unmap( screen,
+ brw->curr.fragment_constants );
+ }
+ }
+
+
+ /* The clipplanes are actually delivered to both CLIP and VS units.
+ * VS uses them to calculate the outcode bitmasks.
+ */
+ if (brw->curbe.clip_size) {
+ GLuint offset = brw->curbe.clip_start * 16;
+ GLuint j;
+
+ /* If any planes are going this way, send them all this way:
+ */
+ for (i = 0; i < 6; i++) {
+ buf[offset + i * 4 + 0] = fixed_plane[i][0];
+ buf[offset + i * 4 + 1] = fixed_plane[i][1];
+ buf[offset + i * 4 + 2] = fixed_plane[i][2];
+ buf[offset + i * 4 + 3] = fixed_plane[i][3];
+ }
+
+ /* Clip planes:
+ */
+ assert(brw->curr.ucp.nr <= 6);
+ for (j = 0; j < brw->curr.ucp.nr; j++) {
+ buf[offset + i * 4 + 0] = brw->curr.ucp.ucp[j][0];
+ buf[offset + i * 4 + 1] = brw->curr.ucp.ucp[j][1];
+ buf[offset + i * 4 + 2] = brw->curr.ucp.ucp[j][2];
+ buf[offset + i * 4 + 3] = brw->curr.ucp.ucp[j][3];
+ i++;
+ }
+ }
+
+ /* vertex shader constants */
+ if (brw->curbe.vs_size) {
+ GLuint offset = brw->curbe.vs_start * 16;
+ const struct brw_vertex_shader *vs = brw->curr.vertex_shader;
+ GLuint nr_immediate, nr_const;
+
+ nr_immediate = vs->immediates.nr;
+ if (nr_immediate) {
+ memcpy(&buf[offset],
+ vs->immediates.data,
+ nr_immediate * 4 * sizeof(float));
+
+ offset += nr_immediate * 4;
+ }
+
+ nr_const = vs->info.file_max[TGSI_FILE_CONSTANT] + 1;
+ if (nr_const) {
+ /* XXX: note that constant buffers are currently *already* in
+ * buffer objects. If we want to keep on putting them into the
+ * curbe, makes sense to treat constbuf's specially with malloc.
+ */
+ const GLfloat *value = screen->buffer_map( screen,
+ brw->curr.vertex_constants,
+ PIPE_BUFFER_USAGE_CPU_READ);
+
+ /* XXX: what if user's constant buffer is too small?
+ */
+ memcpy(&buf[offset], value, nr_const * 4 * sizeof(float));
+
+ screen->buffer_unmap( screen, brw->curr.vertex_constants );
+ }
+ }
+
+ if (BRW_DEBUG & DEBUG_CURBE) {
+ for (i = 0; i < sz*16; i+=4)
+ debug_printf("curbe %d.%d: %f %f %f %f\n", i/8, i&4,
+ buf[i+0], buf[i+1], buf[i+2], buf[i+3]);
+
+ debug_printf("last_buf %p buf %p sz %d/%d cmp %d\n",
+ (void *)brw->curbe.last_buf, (void *)buf,
+ bufsz, brw->curbe.last_bufsz,
+ brw->curbe.last_buf ? memcmp(buf, brw->curbe.last_buf, bufsz) : -1);
+ }
+
+ if (brw->curbe.curbe_bo != NULL &&
+ brw->curbe.last_buf &&
+ bufsz == brw->curbe.last_bufsz &&
+ memcmp(buf, brw->curbe.last_buf, bufsz) == 0) {
+ /* constants have not changed */
+ FREE(buf);
+ }
+ else {
+ /* constants have changed */
+ FREE(brw->curbe.last_buf);
+
+ brw->curbe.last_buf = buf;
+ brw->curbe.last_bufsz = bufsz;
+
+ if (brw->curbe.curbe_bo != NULL &&
+ (brw->curbe.need_new_bo ||
+ brw->curbe.curbe_next_offset + bufsz > brw->curbe.curbe_bo->size))
+ {
+ bo_reference(&brw->curbe.curbe_bo, NULL);
+ }
+
+ if (brw->curbe.curbe_bo == NULL) {
+ /* Allocate a single page for CURBE entries for this
+ * batchbuffer. They're generally around 64b. We will
+ * discard the curbe buffer after the batch is flushed to
+ * avoid synchronous updates.
+ */
+ ret = brw->sws->bo_alloc(brw->sws,
+ BRW_BUFFER_TYPE_CURBE,
+ 4096, 1 << 6,
+ &brw->curbe.curbe_bo);
+ if (ret)
+ return ret;
+
+ brw->curbe.curbe_next_offset = 0;
+ }
+
+ brw->curbe.curbe_offset = brw->curbe.curbe_next_offset;
+ brw->curbe.curbe_next_offset += bufsz;
+ brw->curbe.curbe_next_offset = align(brw->curbe.curbe_next_offset, 64);
+
+ /* Copy data to the buffer:
+ */
+ brw->sws->bo_subdata(brw->curbe.curbe_bo,
+ BRW_DATA_CONSTANT_BUFFER,
+ brw->curbe.curbe_offset,
+ bufsz,
+ buf,
+ NULL, 0);
+ }
+
+ brw_add_validated_bo(brw, brw->curbe.curbe_bo);
+
+ /* Because this provokes an action (ie copy the constants into the
+ * URB), it shouldn't be shortcircuited if identical to the
+ * previous time - because eg. the urb destination may have
+ * changed, or the urb contents different to last time.
+ *
+ * Note that the data referred to is actually copied internally,
+ * not just used in place according to passed pointer.
+ *
+ * It appears that the CS unit takes care of using each available
+ * URB entry (Const URB Entry == CURBE) in turn, and issuing
+ * flushes as necessary when doublebuffering of CURBEs isn't
+ * possible.
+ */
+
+ return 0;
+}
+
+static enum pipe_error emit_curbe_buffer(struct brw_context *brw)
+{
+ GLuint sz = brw->curbe.total_size;
+
+ BEGIN_BATCH(2, IGNORE_CLIPRECTS);
+ if (sz == 0) {
+ OUT_BATCH((CMD_CONST_BUFFER << 16) | (2 - 2));
+ OUT_BATCH(0);
+ } else {
+ OUT_BATCH((CMD_CONST_BUFFER << 16) | (1 << 8) | (2 - 2));
+ OUT_RELOC(brw->curbe.curbe_bo,
+ BRW_USAGE_STATE,
+ (sz - 1) + brw->curbe.curbe_offset);
+ }
+ ADVANCE_BATCH();
+ return 0;
+}
+
+const struct brw_tracked_state brw_curbe_buffer = {
+ .dirty = {
+ .mesa = (PIPE_NEW_FRAGMENT_CONSTANTS |
+ PIPE_NEW_VERTEX_CONSTANTS |
+ PIPE_NEW_CLIP),
+ .brw = (BRW_NEW_FRAGMENT_PROGRAM |
+ BRW_NEW_VERTEX_PROGRAM |
+ BRW_NEW_URB_FENCE | /* Implicit - hardware requires this, not used above */
+ BRW_NEW_PSP | /* Implicit - hardware requires this, not used above */
+ BRW_NEW_CURBE_OFFSETS |
+ BRW_NEW_BATCH),
+ .cache = (CACHE_NEW_WM_PROG)
+ },
+ .prepare = prepare_curbe_buffer,
+ .emit = emit_curbe_buffer,
+};
+
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