diff options
Diffstat (limited to 'src/gallium/drivers/i965/brw_curbe.c')
-rw-r--r-- | src/gallium/drivers/i965/brw_curbe.c | 390 |
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 new file mode 100644 index 0000000..3f03157 --- /dev/null +++ b/src/gallium/drivers/i965/brw_curbe.c @@ -0,0 +1,390 @@ +/* + 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, +}; + |