diff options
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_rast.c')
| -rw-r--r-- | src/gallium/drivers/llvmpipe/lp_rast.c | 1032 |
1 files changed, 1032 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_rast.c b/src/gallium/drivers/llvmpipe/lp_rast.c new file mode 100644 index 0000000000..50e44dcb2b --- /dev/null +++ b/src/gallium/drivers/llvmpipe/lp_rast.c @@ -0,0 +1,1032 @@ +/************************************************************************** + * + * Copyright 2009 VMware, Inc. + * All Rights Reserved. + * + * 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, 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 VMWARE 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. + * + **************************************************************************/ + +#include <limits.h> +#include "util/u_memory.h" +#include "util/u_math.h" +#include "util/u_surface.h" + +#include "lp_scene_queue.h" +#include "lp_debug.h" +#include "lp_fence.h" +#include "lp_perf.h" +#include "lp_query.h" +#include "lp_rast.h" +#include "lp_rast_priv.h" +#include "lp_tile_soa.h" +#include "gallivm/lp_bld_debug.h" +#include "lp_scene.h" + + +/** + * Begin rasterizing a scene. + * Called once per scene by one thread. + */ +static void +lp_rast_begin( struct lp_rasterizer *rast, + struct lp_scene *scene ) +{ + const struct pipe_framebuffer_state *fb = &scene->fb; + int i; + + rast->curr_scene = scene; + + LP_DBG(DEBUG_RAST, "%s\n", __FUNCTION__); + + rast->state.nr_cbufs = scene->fb.nr_cbufs; + + for (i = 0; i < rast->state.nr_cbufs; i++) { + struct pipe_surface *cbuf = scene->fb.cbufs[i]; + llvmpipe_resource_map(cbuf->texture, + cbuf->face, + cbuf->level, + cbuf->zslice, + LP_TEX_USAGE_READ_WRITE, + LP_TEX_LAYOUT_NONE); + } + + if (fb->zsbuf) { + struct pipe_surface *zsbuf = scene->fb.zsbuf; + rast->zsbuf.stride = llvmpipe_resource_stride(zsbuf->texture, zsbuf->level); + rast->zsbuf.blocksize = + util_format_get_blocksize(zsbuf->texture->format); + + rast->zsbuf.map = llvmpipe_resource_map(zsbuf->texture, + zsbuf->face, + zsbuf->level, + zsbuf->zslice, + LP_TEX_USAGE_READ_WRITE, + LP_TEX_LAYOUT_NONE); + assert(rast->zsbuf.map); + } + + lp_scene_bin_iter_begin( scene ); +} + + +static void +lp_rast_end( struct lp_rasterizer *rast ) +{ + struct lp_scene *scene = rast->curr_scene; + unsigned i; + + /* Unmap color buffers */ + for (i = 0; i < rast->state.nr_cbufs; i++) { + struct pipe_surface *cbuf = scene->fb.cbufs[i]; + llvmpipe_resource_unmap(cbuf->texture, + cbuf->face, + cbuf->level, + cbuf->zslice); + } + + /* Unmap z/stencil buffer */ + if (rast->zsbuf.map) { + struct pipe_surface *zsbuf = scene->fb.zsbuf; + llvmpipe_resource_unmap(zsbuf->texture, + zsbuf->face, + zsbuf->level, + zsbuf->zslice); + rast->zsbuf.map = NULL; + } + + lp_scene_reset( rast->curr_scene ); + + rast->curr_scene = NULL; + +#ifdef DEBUG + if (0) + debug_printf("Post render scene: tile unswizzle: %u tile swizzle: %u\n", + lp_tile_unswizzle_count, lp_tile_swizzle_count); +#endif +} + + +/** + * Begining rasterization of a tile. + * \param x window X position of the tile, in pixels + * \param y window Y position of the tile, in pixels + */ +static void +lp_rast_tile_begin(struct lp_rasterizer_task *task, + unsigned x, unsigned y) +{ + struct lp_rasterizer *rast = task->rast; + struct lp_scene *scene = rast->curr_scene; + enum lp_texture_usage usage; + unsigned buf; + + LP_DBG(DEBUG_RAST, "%s %d,%d\n", __FUNCTION__, x, y); + + assert(x % TILE_SIZE == 0); + assert(y % TILE_SIZE == 0); + + task->x = x; + task->y = y; + + if (scene->has_color_clear) + usage = LP_TEX_USAGE_WRITE_ALL; + else + usage = LP_TEX_USAGE_READ_WRITE; + + /* get pointers to color tile(s) */ + for (buf = 0; buf < rast->state.nr_cbufs; buf++) { + struct pipe_surface *cbuf = rast->curr_scene->fb.cbufs[buf]; + struct llvmpipe_resource *lpt; + assert(cbuf); + lpt = llvmpipe_resource(cbuf->texture); + task->color_tiles[buf] = llvmpipe_get_texture_tile(lpt, + cbuf->face + cbuf->zslice, + cbuf->level, + usage, + x, y); + assert(task->color_tiles[buf]); + } + + /* get pointer to depth/stencil tile */ + { + struct pipe_surface *zsbuf = rast->curr_scene->fb.zsbuf; + if (zsbuf) { + struct llvmpipe_resource *lpt = llvmpipe_resource(zsbuf->texture); + + if (scene->has_depthstencil_clear) + usage = LP_TEX_USAGE_WRITE_ALL; + else + usage = LP_TEX_USAGE_READ_WRITE; + + /* "prime" the tile: convert data from linear to tiled if necessary + * and update the tile's layout info. + */ + (void) llvmpipe_get_texture_tile(lpt, + zsbuf->face + zsbuf->zslice, + zsbuf->level, + usage, + x, y); + /* Get actual pointer to the tile data. Note that depth/stencil + * data is tiled differently than color data. + */ + task->depth_tile = lp_rast_get_depth_block_pointer(rast, x, y); + + assert(task->depth_tile); + } + else { + task->depth_tile = NULL; + } + } +} + + +/** + * Clear the rasterizer's current color tile. + * This is a bin command called during bin processing. + */ +void +lp_rast_clear_color(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + struct lp_rasterizer *rast = task->rast; + const uint8_t *clear_color = arg.clear_color; + + unsigned i; + + LP_DBG(DEBUG_RAST, "%s 0x%x,0x%x,0x%x,0x%x\n", __FUNCTION__, + clear_color[0], + clear_color[1], + clear_color[2], + clear_color[3]); + + if (clear_color[0] == clear_color[1] && + clear_color[1] == clear_color[2] && + clear_color[2] == clear_color[3]) { + /* clear to grayscale value {x, x, x, x} */ + for (i = 0; i < rast->state.nr_cbufs; i++) { + uint8_t *ptr = task->color_tiles[i]; + memset(ptr, clear_color[0], TILE_SIZE * TILE_SIZE * 4); + } + } + else { + /* Non-gray color. + * Note: if the swizzled tile layout changes (see TILE_PIXEL) this code + * will need to change. It'll be pretty obvious when clearing no longer + * works. + */ + const unsigned chunk = TILE_SIZE / 4; + for (i = 0; i < rast->state.nr_cbufs; i++) { + uint8_t *c = task->color_tiles[i]; + unsigned j; + + for (j = 0; j < 4 * TILE_SIZE; j++) { + memset(c, clear_color[0], chunk); + c += chunk; + memset(c, clear_color[1], chunk); + c += chunk; + memset(c, clear_color[2], chunk); + c += chunk; + memset(c, clear_color[3], chunk); + c += chunk; + } + } + } + + LP_COUNT(nr_color_tile_clear); +} + + +/** + * Clear the rasterizer's current z/stencil tile. + * This is a bin command called during bin processing. + */ +void +lp_rast_clear_zstencil(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + struct lp_rasterizer *rast = task->rast; + const struct lp_rast_clearzs *clearzs = arg.clear_zstencil; + unsigned clear_value = clearzs->clearzs_value; + unsigned clear_mask = clearzs->clearzs_mask; + const unsigned height = TILE_SIZE / TILE_VECTOR_HEIGHT; + const unsigned width = TILE_SIZE * TILE_VECTOR_HEIGHT; + const unsigned block_size = rast->zsbuf.blocksize; + const unsigned dst_stride = rast->zsbuf.stride * TILE_VECTOR_HEIGHT; + uint8_t *dst; + unsigned i, j; + + LP_DBG(DEBUG_RAST, "%s 0x%x%x\n", __FUNCTION__, clear_value, clear_mask); + + /* + * Clear the aera of the swizzled depth/depth buffer matching this tile, in + * stripes of TILE_VECTOR_HEIGHT x TILE_SIZE at a time. + * + * The swizzled depth format is such that the depths for + * TILE_VECTOR_HEIGHT x TILE_VECTOR_WIDTH pixels have consecutive offsets. + */ + + dst = task->depth_tile; + + assert(dst == lp_rast_get_depth_block_pointer(rast, task->x, task->y)); + + switch (block_size) { + case 1: + memset(dst, (uint8_t) clear_value, height * width); + break; + case 2: + for (i = 0; i < height; i++) { + uint16_t *row = (uint16_t *)dst; + for (j = 0; j < width; j++) + *row++ = (uint16_t) clear_value; + dst += dst_stride; + } + break; + case 4: + if (clear_mask == 0xffffffff) { + for (i = 0; i < height; i++) { + uint32_t *row = (uint32_t *)dst; + for (j = 0; j < width; j++) + *row++ = clear_value; + dst += dst_stride; + } + } + else { + for (i = 0; i < height; i++) { + uint32_t *row = (uint32_t *)dst; + for (j = 0; j < width; j++) { + uint32_t tmp = ~clear_mask & *row; + *row++ = (clear_value & clear_mask) | tmp; + } + dst += dst_stride; + } + } + break; + default: + assert(0); + break; + } +} + + +/** + * Load tile color from the framebuffer surface. + * This is a bin command called during bin processing. + */ +#if 0 +void +lp_rast_load_color(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + struct lp_rasterizer *rast = task->rast; + unsigned buf; + enum lp_texture_usage usage; + + LP_DBG(DEBUG_RAST, "%s at %u, %u\n", __FUNCTION__, x, y); + + if (scene->has_color_clear) + usage = LP_TEX_USAGE_WRITE_ALL; + else + usage = LP_TEX_USAGE_READ_WRITE; + + /* Get pointers to color tile(s). + * This will convert linear data to tiled if needed. + */ + for (buf = 0; buf < rast->state.nr_cbufs; buf++) { + struct pipe_surface *cbuf = rast->curr_scene->fb.cbufs[buf]; + struct llvmpipe_texture *lpt; + assert(cbuf); + lpt = llvmpipe_texture(cbuf->texture); + task->color_tiles[buf] = llvmpipe_get_texture_tile(lpt, + cbuf->face + cbuf->zslice, + cbuf->level, + usage, + task->x, task->y); + assert(task->color_tiles[buf]); + } +} +#endif + + +/** + * Convert the color tile from tiled to linear layout. + * This is generally only done when we're flushing the scene just prior to + * SwapBuffers. If we didn't do this here, we'd have to convert the entire + * tiled color buffer to linear layout in the llvmpipe_texture_unmap() + * function. It's better to do it here to take advantage of + * threading/parallelism. + * This is a bin command which is stored in all bins. + */ +void +lp_rast_store_color( struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + struct lp_rasterizer *rast = task->rast; + struct lp_scene *scene = rast->curr_scene; + unsigned buf; + + for (buf = 0; buf < rast->state.nr_cbufs; buf++) { + struct pipe_surface *cbuf = scene->fb.cbufs[buf]; + const unsigned face = cbuf->face, level = cbuf->level; + struct llvmpipe_resource *lpt = llvmpipe_resource(cbuf->texture); + /* this will convert the tiled data to linear if needed */ + (void) llvmpipe_get_texture_tile_linear(lpt, face, level, + LP_TEX_USAGE_READ, + task->x, task->y); + } +} + + +/** + * This is a bin command called during bin processing. + */ +void +lp_rast_set_state(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + const struct lp_rast_state *state = arg.set_state; + + LP_DBG(DEBUG_RAST, "%s %p\n", __FUNCTION__, (void *) state); + + /* just set the current state pointer for this rasterizer */ + task->current_state = state; +} + + +/** + * Run the shader on all blocks in a tile. This is used when a tile is + * completely contained inside a triangle. + * This is a bin command called during bin processing. + */ +void +lp_rast_shade_tile(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + struct lp_rasterizer *rast = task->rast; + const struct lp_rast_state *state = task->current_state; + const struct lp_rast_shader_inputs *inputs = arg.shade_tile; + struct lp_fragment_shader_variant *variant = state->variant; + const unsigned tile_x = task->x, tile_y = task->y; + unsigned x, y; + + LP_DBG(DEBUG_RAST, "%s\n", __FUNCTION__); + + /* render the whole 64x64 tile in 4x4 chunks */ + for (y = 0; y < TILE_SIZE; y += 4){ + for (x = 0; x < TILE_SIZE; x += 4) { + uint8_t *color[PIPE_MAX_COLOR_BUFS]; + uint32_t *depth; + unsigned i; + + /* color buffer */ + for (i = 0; i < rast->state.nr_cbufs; i++) + color[i] = lp_rast_get_color_block_pointer(task, i, + tile_x + x, tile_y + y); + + /* depth buffer */ + depth = lp_rast_get_depth_block_pointer(rast, tile_x + x, tile_y + y); + + /* run shader on 4x4 block */ + variant->jit_function[RAST_WHOLE]( &state->jit_context, + tile_x + x, tile_y + y, + inputs->facing, + inputs->a0, + inputs->dadx, + inputs->dady, + color, + depth, + INT_MIN, INT_MIN, INT_MIN, + NULL, NULL, NULL, &task->vis_counter); + } + } +} + + +/** + * Compute shading for a 4x4 block of pixels. + * This is a bin command called during bin processing. + * \param x X position of quad in window coords + * \param y Y position of quad in window coords + */ +void lp_rast_shade_quads( struct lp_rasterizer_task *task, + const struct lp_rast_shader_inputs *inputs, + unsigned x, unsigned y, + int32_t c1, int32_t c2, int32_t c3) +{ + const struct lp_rast_state *state = task->current_state; + struct lp_fragment_shader_variant *variant = state->variant; + struct lp_rasterizer *rast = task->rast; + uint8_t *color[PIPE_MAX_COLOR_BUFS]; + void *depth; + unsigned i; + + assert(state); + + /* Sanity checks */ + assert(x % TILE_VECTOR_WIDTH == 0); + assert(y % TILE_VECTOR_HEIGHT == 0); + + assert((x % 4) == 0); + assert((y % 4) == 0); + + /* color buffer */ + for (i = 0; i < rast->state.nr_cbufs; i++) { + color[i] = lp_rast_get_color_block_pointer(task, i, x, y); + assert(lp_check_alignment(color[i], 16)); + } + + /* depth buffer */ + depth = lp_rast_get_depth_block_pointer(rast, x, y); + + + assert(lp_check_alignment(state->jit_context.blend_color, 16)); + + assert(lp_check_alignment(inputs->step[0], 16)); + assert(lp_check_alignment(inputs->step[1], 16)); + assert(lp_check_alignment(inputs->step[2], 16)); + + /* run shader on 4x4 block */ + variant->jit_function[RAST_EDGE_TEST]( &state->jit_context, + x, y, + inputs->facing, + inputs->a0, + inputs->dadx, + inputs->dady, + color, + depth, + c1, c2, c3, + inputs->step[0], + inputs->step[1], + inputs->step[2], + &task->vis_counter); +} + + +/** + * Set top row and left column of the tile's pixels to white. For debugging. + */ +static void +outline_tile(uint8_t *tile) +{ + const uint8_t val = 0xff; + unsigned i; + + for (i = 0; i < TILE_SIZE; i++) { + TILE_PIXEL(tile, i, 0, 0) = val; + TILE_PIXEL(tile, i, 0, 1) = val; + TILE_PIXEL(tile, i, 0, 2) = val; + TILE_PIXEL(tile, i, 0, 3) = val; + + TILE_PIXEL(tile, 0, i, 0) = val; + TILE_PIXEL(tile, 0, i, 1) = val; + TILE_PIXEL(tile, 0, i, 2) = val; + TILE_PIXEL(tile, 0, i, 3) = val; + } +} + + +/** + * Draw grid of gray lines at 16-pixel intervals across the tile to + * show the sub-tile boundaries. For debugging. + */ +static void +outline_subtiles(uint8_t *tile) +{ + const uint8_t val = 0x80; + const unsigned step = 16; + unsigned i, j; + + for (i = 0; i < TILE_SIZE; i += step) { + for (j = 0; j < TILE_SIZE; j++) { + TILE_PIXEL(tile, i, j, 0) = val; + TILE_PIXEL(tile, i, j, 1) = val; + TILE_PIXEL(tile, i, j, 2) = val; + TILE_PIXEL(tile, i, j, 3) = val; + + TILE_PIXEL(tile, j, i, 0) = val; + TILE_PIXEL(tile, j, i, 1) = val; + TILE_PIXEL(tile, j, i, 2) = val; + TILE_PIXEL(tile, j, i, 3) = val; + } + } + + outline_tile(tile); +} + + + +/** + * Called when we're done writing to a color tile. + */ +static void +lp_rast_tile_end(struct lp_rasterizer_task *task) +{ +#ifdef DEBUG + if (LP_DEBUG & (DEBUG_SHOW_SUBTILES | DEBUG_SHOW_TILES)) { + struct lp_rasterizer *rast = task->rast; + unsigned buf; + + for (buf = 0; buf < rast->state.nr_cbufs; buf++) { + uint8_t *color = lp_rast_get_color_block_pointer(task, buf, + task->x, task->y); + + if (LP_DEBUG & DEBUG_SHOW_SUBTILES) + outline_subtiles(color); + else if (LP_DEBUG & DEBUG_SHOW_TILES) + outline_tile(color); + } + } +#else + (void) outline_subtiles; +#endif + + /* debug */ + memset(task->color_tiles, 0, sizeof(task->color_tiles)); + task->depth_tile = NULL; +} + + + +/** + * Signal on a fence. This is called during bin execution/rasterization. + * Called per thread. + */ +void +lp_rast_fence(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + struct lp_fence *fence = arg.fence; + lp_fence_signal(fence); +} + + +/** + * Begin a new occlusion query. + * This is a bin command put in all bins. + * Called per thread. + */ +void +lp_rast_begin_query(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + /* Reset the the per-task counter */ + task->vis_counter = 0; +} + + +/** + * End the current occlusion query. + * This is a bin command put in all bins. + * Called per thread. + */ +void +lp_rast_end_query(struct lp_rasterizer_task *task, + const union lp_rast_cmd_arg arg) +{ + struct llvmpipe_query *pq = arg.query_obj; + + pipe_mutex_lock(pq->mutex); + { + /* Accumulate the visible fragment counter from this tile in + * the query object. + */ + pq->count[task->thread_index] += task->vis_counter; + + /* check if this is the last tile in the scene */ + pq->tile_count++; + if (pq->tile_count == pq->num_tiles) { + uint i; + + /* sum the per-thread counters for the query */ + pq->result = 0; + for (i = 0; i < LP_MAX_THREADS; i++) { + pq->result += pq->count[i]; + } + + /* reset counters (in case this query is re-used in the scene) */ + memset(pq->count, 0, sizeof(pq->count)); + + pq->tile_count = 0; + pq->binned = FALSE; + pq->done = TRUE; + } + } + pipe_mutex_unlock(pq->mutex); +} + + + +/** + * Rasterize commands for a single bin. + * \param x, y position of the bin's tile in the framebuffer + * Must be called between lp_rast_begin() and lp_rast_end(). + * Called per thread. + */ +static void +rasterize_bin(struct lp_rasterizer_task *task, + const struct cmd_bin *bin, + int x, int y) +{ + const struct cmd_block_list *commands = &bin->commands; + struct cmd_block *block; + unsigned k; + + lp_rast_tile_begin( task, x * TILE_SIZE, y * TILE_SIZE ); + + /* simply execute each of the commands in the block list */ + for (block = commands->head; block; block = block->next) { + for (k = 0; k < block->count; k++) { + block->cmd[k]( task, block->arg[k] ); + } + } + + lp_rast_tile_end(task); + + /* Free data for this bin. + */ + lp_scene_bin_reset( task->rast->curr_scene, x, y); +} + + +#define RAST(x) { lp_rast_##x, #x } + +static struct { + lp_rast_cmd cmd; + const char *name; +} cmd_names[] = +{ + RAST(clear_color), + RAST(clear_zstencil), + RAST(triangle), + RAST(shade_tile), + RAST(set_state), + RAST(store_color), + RAST(fence), + RAST(begin_query), + RAST(end_query), +}; + +static void +debug_bin( const struct cmd_bin *bin ) +{ + const struct cmd_block *head = bin->commands.head; + int i, j; + + for (i = 0; i < head->count; i++) { + debug_printf("%d: ", i); + for (j = 0; j < Elements(cmd_names); j++) { + if (head->cmd[i] == cmd_names[j].cmd) { + debug_printf("%s\n", cmd_names[j].name); + break; + } + } + if (j == Elements(cmd_names)) + debug_printf("...other\n"); + } + +} + +/* An empty bin is one that just loads the contents of the tile and + * stores them again unchanged. This typically happens when bins have + * been flushed for some reason in the middle of a frame, or when + * incremental updates are being made to a render target. + * + * Try to avoid doing pointless work in this case. + */ +static boolean +is_empty_bin( const struct cmd_bin *bin ) +{ + const struct cmd_block *head = bin->commands.head; + int i; + + if (0) + debug_bin(bin); + + /* We emit at most two load-tile commands at the start of the first + * command block. In addition we seem to emit a couple of + * set-state commands even in empty bins. + * + * As a heuristic, if a bin has more than 4 commands, consider it + * non-empty. + */ + if (head->next != NULL || + head->count > 4) { + return FALSE; + } + + for (i = 0; i < head->count; i++) + if (head->cmd[i] != lp_rast_set_state) { + return FALSE; + } + + return TRUE; +} + + + +/** + * Rasterize/execute all bins within a scene. + * Called per thread. + */ +static void +rasterize_scene(struct lp_rasterizer_task *task, + struct lp_scene *scene) +{ + /* loop over scene bins, rasterize each */ +#if 0 + { + unsigned i, j; + for (i = 0; i < scene->tiles_x; i++) { + for (j = 0; j < scene->tiles_y; j++) { + struct cmd_bin *bin = lp_scene_get_bin(scene, i, j); + rasterize_bin(task, bin, i, j); + } + } + } +#else + { + struct cmd_bin *bin; + int x, y; + + assert(scene); + while ((bin = lp_scene_bin_iter_next(scene, &x, &y))) { + if (!is_empty_bin( bin )) + rasterize_bin(task, bin, x, y); + } + } +#endif +} + + +/** + * Called by setup module when it has something for us to render. + */ +void +lp_rast_queue_scene( struct lp_rasterizer *rast, + struct lp_scene *scene) +{ + LP_DBG(DEBUG_SETUP, "%s\n", __FUNCTION__); + + if (rast->num_threads == 0) { + /* no threading */ + + lp_rast_begin( rast, scene ); + + rasterize_scene( &rast->tasks[0], scene ); + + lp_scene_reset( scene ); + + lp_rast_end( rast ); + + rast->curr_scene = NULL; + } + else { + /* threaded rendering! */ + unsigned i; + + lp_scene_enqueue( rast->full_scenes, scene ); + + /* signal the threads that there's work to do */ + for (i = 0; i < rast->num_threads; i++) { + pipe_semaphore_signal(&rast->tasks[i].work_ready); + } + } + + LP_DBG(DEBUG_SETUP, "%s done \n", __FUNCTION__); +} + + +void +lp_rast_finish( struct lp_rasterizer *rast ) +{ + if (rast->num_threads == 0) { + /* nothing to do */ + } + else { + int i; + + /* wait for work to complete */ + for (i = 0; i < rast->num_threads; i++) { + pipe_semaphore_wait(&rast->tasks[i].work_done); + } + } +} + + +/** + * This is the thread's main entrypoint. + * It's a simple loop: + * 1. wait for work + * 2. do work + * 3. signal that we're done + */ +static PIPE_THREAD_ROUTINE( thread_func, init_data ) +{ + struct lp_rasterizer_task *task = (struct lp_rasterizer_task *) init_data; + struct lp_rasterizer *rast = task->rast; + boolean debug = false; + + while (1) { + /* wait for work */ + if (debug) + debug_printf("thread %d waiting for work\n", task->thread_index); + pipe_semaphore_wait(&task->work_ready); + + if (rast->exit_flag) + break; + + if (task->thread_index == 0) { + /* thread[0]: + * - get next scene to rasterize + * - map the framebuffer surfaces + */ + lp_rast_begin( rast, + lp_scene_dequeue( rast->full_scenes, TRUE ) ); + } + + /* Wait for all threads to get here so that threads[1+] don't + * get a null rast->curr_scene pointer. + */ + pipe_barrier_wait( &rast->barrier ); + + /* do work */ + if (debug) + debug_printf("thread %d doing work\n", task->thread_index); + + rasterize_scene(task, + rast->curr_scene); + + /* wait for all threads to finish with this scene */ + pipe_barrier_wait( &rast->barrier ); + + /* XXX: shouldn't be necessary: + */ + if (task->thread_index == 0) { + lp_rast_end( rast ); + } + + /* signal done with work */ + if (debug) + debug_printf("thread %d done working\n", task->thread_index); + + pipe_semaphore_signal(&task->work_done); + } + + return NULL; +} + + +/** + * Initialize semaphores and spawn the threads. + */ +static void +create_rast_threads(struct lp_rasterizer *rast) +{ + unsigned i; + + /* NOTE: if num_threads is zero, we won't use any threads */ + for (i = 0; i < rast->num_threads; i++) { + pipe_semaphore_init(&rast->tasks[i].work_ready, 0); + pipe_semaphore_init(&rast->tasks[i].work_done, 0); + rast->threads[i] = pipe_thread_create(thread_func, + (void *) &rast->tasks[i]); + } +} + + + +/** + * Create new lp_rasterizer. If num_threads is zero, don't create any + * new threads, do rendering synchronously. + * \param num_threads number of rasterizer threads to create + */ +struct lp_rasterizer * +lp_rast_create( unsigned num_threads ) +{ + struct lp_rasterizer *rast; + unsigned i; + + rast = CALLOC_STRUCT(lp_rasterizer); + if(!rast) + return NULL; + + rast->full_scenes = lp_scene_queue_create(); + + for (i = 0; i < Elements(rast->tasks); i++) { + struct lp_rasterizer_task *task = &rast->tasks[i]; + task->rast = rast; + task->thread_index = i; + } + + rast->num_threads = num_threads; + + create_rast_threads(rast); + + /* for synchronizing rasterization threads */ + pipe_barrier_init( &rast->barrier, rast->num_threads ); + + return rast; +} + + +/* Shutdown: + */ +void lp_rast_destroy( struct lp_rasterizer *rast ) +{ + unsigned i; + + /* Set exit_flag and signal each thread's work_ready semaphore. + * Each thread will be woken up, notice that the exit_flag is set and + * break out of its main loop. The thread will then exit. + */ + rast->exit_flag = TRUE; + for (i = 0; i < rast->num_threads; i++) { + pipe_semaphore_signal(&rast->tasks[i].work_ready); + } + + /* Wait for threads to terminate before cleaning up per-thread data */ + for (i = 0; i < rast->num_threads; i++) { + pipe_thread_wait(rast->threads[i]); + } + + /* Clean up per-thread data */ + for (i = 0; i < rast->num_threads; i++) { + pipe_semaphore_destroy(&rast->tasks[i].work_ready); + pipe_semaphore_destroy(&rast->tasks[i].work_done); + } + + /* for synchronizing rasterization threads */ + pipe_barrier_destroy( &rast->barrier ); + + lp_scene_queue_destroy(rast->full_scenes); + + FREE(rast); +} + + +/** Return number of rasterization threads */ +unsigned +lp_rast_get_num_threads( struct lp_rasterizer *rast ) +{ + return rast->num_threads; +} + + |