--- /dev/null
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/**
+ * \file brw_vec4_gs.c
+ *
+ * State atom for client-programmable geometry shaders, and support code.
+ */
+
+#include "brw_vec4_gs.h"
+#include "brw_context.h"
+#include "brw_vec4_gs_visitor.h"
+#include "brw_state.h"
+
+
+static bool
+do_gs_prog(struct brw_context *brw,
+ struct gl_shader_program *prog,
+ struct brw_geometry_program *gp,
+ struct brw_gs_prog_key *key)
+{
+ struct brw_stage_state *stage_state = &brw->gs.base;
+ struct brw_gs_compile c;
+ memset(&c, 0, sizeof(c));
+ c.key = *key;
+ c.gp = gp;
+
+ /* Allocate the references to the uniforms that will end up in the
+ * prog_data associated with the compiled program, and which will be freed
+ * by the state cache.
+ *
+ * Note: param_count needs to be num_uniform_components * 4, since we add
+ * padding around uniform values below vec4 size, so the worst case is that
+ * every uniform is a float which gets padded to the size of a vec4.
+ */
+ struct gl_shader *gs = prog->_LinkedShaders[MESA_SHADER_GEOMETRY];
+ int param_count = gs->num_uniform_components * 4;
+
+ /* We also upload clip plane data as uniforms */
+ param_count += MAX_CLIP_PLANES * 4;
+
+ c.prog_data.base.param = rzalloc_array(NULL, const float *, param_count);
+ c.prog_data.base.pull_param = rzalloc_array(NULL, const float *, param_count);
+
+ brw_compute_vue_map(brw, &c.prog_data.base.vue_map,
+ gp->program.Base.OutputsWritten,
+ c.key.base.userclip_active);
+
+ /* Compute the output vertex size.
+ *
+ * From the Ivy Bridge PRM, Vol2 Part1 7.2.1.1 STATE_GS - Output Vertex
+ * Size (p168):
+ *
+ * [0,62] indicating [1,63] 16B units
+ *
+ * Specifies the size of each vertex stored in the GS output entry
+ * (following any Control Header data) as a number of 128-bit units
+ * (minus one).
+ *
+ * Programming Restrictions: The vertex size must be programmed as a
+ * multiple of 32B units with the following exception: Rendering is
+ * disabled (as per SOL stage state) and the vertex size output by the
+ * GS thread is 16B.
+ *
+ * If rendering is enabled (as per SOL state) the vertex size must be
+ * programmed as a multiple of 32B units. In other words, the only time
+ * software can program a vertex size with an odd number of 16B units
+ * is when rendering is disabled.
+ *
+ * Note: B=bytes in the above text.
+ *
+ * It doesn't seem worth the extra trouble to optimize the case where the
+ * vertex size is 16B (especially since this would require special-casing
+ * the GEN assembly that writes to the URB). So we just set the vertex
+ * size to a multiple of 32B (2 vec4's) in all cases.
+ *
+ * The maximum output vertex size is 62*16 = 992 bytes (31 hwords). We
+ * budget that as follows:
+ *
+ * 512 bytes for varyings (a varying component is 4 bytes and
+ * gl_MaxGeometryOutputComponents = 128)
+ * 16 bytes overhead for VARYING_SLOT_PSIZ (each varying slot is 16
+ * bytes)
+ * 16 bytes overhead for gl_Position (we allocate it a slot in the VUE
+ * even if it's not used)
+ * 32 bytes overhead for gl_ClipDistance (we allocate it 2 VUE slots
+ * whenever clip planes are enabled, even if the shader doesn't
+ * write to gl_ClipDistance)
+ * 16 bytes overhead since the VUE size must be a multiple of 32 bytes
+ * (see below)--this causes up to 1 VUE slot to be wasted
+ * 400 bytes available for varying packing overhead
+ *
+ * Worst-case varying packing overhead is 3/4 of a varying slot (12 bytes)
+ * per interpolation type, so this is plenty.
+ *
+ */
+ unsigned output_vertex_size_bytes = c.prog_data.base.vue_map.num_slots * 16;
+ assert(output_vertex_size_bytes <= GEN7_MAX_GS_OUTPUT_VERTEX_SIZE_BYTES);
+ c.prog_data.output_vertex_size_hwords =
+ ALIGN(output_vertex_size_bytes, 32) / 32;
+
+ /* Compute URB entry size. The maximum allowed URB entry size is 32k.
+ * That divides up as follows:
+ *
+ * 64 bytes for the control data header (cut indices or StreamID bits)
+ * 4096 bytes for varyings (a varying component is 4 bytes and
+ * gl_MaxGeometryTotalOutputComponents = 1024)
+ * 4096 bytes overhead for VARYING_SLOT_PSIZ (each varying slot is 16
+ * bytes/vertex and gl_MaxGeometryOutputVertices is 256)
+ * 4096 bytes overhead for gl_Position (we allocate it a slot in the VUE
+ * even if it's not used)
+ * 8192 bytes overhead for gl_ClipDistance (we allocate it 2 VUE slots
+ * whenever clip planes are enabled, even if the shader doesn't
+ * write to gl_ClipDistance)
+ * 4096 bytes overhead since the VUE size must be a multiple of 32
+ * bytes (see above)--this causes up to 1 VUE slot to be wasted
+ * 8128 bytes available for varying packing overhead
+ *
+ * Worst-case varying packing overhead is 3/4 of a varying slot per
+ * interpolation type, which works out to 3072 bytes, so this would allow
+ * us to accommodate 2 interpolation types without any danger of running
+ * out of URB space.
+ *
+ * In practice, the risk of running out of URB space is very small, since
+ * the above figures are all worst-case, and most of them scale with the
+ * number of output vertices. So we'll just calculate the amount of space
+ * we need, and if it's too large, fail to compile.
+ */
+ unsigned output_size_bytes =
+ c.prog_data.output_vertex_size_hwords * 32 * gp->program.VerticesOut;
+
+ assert(output_size_bytes >= 1);
+ if (output_size_bytes > GEN7_MAX_GS_URB_ENTRY_SIZE_BYTES)
+ return false;
+
+ /* URB entry sizes are stored as a multiple of 64 bytes. */
+ c.prog_data.base.urb_entry_size = ALIGN(output_size_bytes, 64) / 64;
+
+ c.prog_data.output_topology = prim_to_hw_prim[gp->program.OutputType];
+
+ /* GS inputs are read from the VUE 256 bits (2 vec4's) at a time, so we
+ * need to program a URB read length of ceiling(num_slots / 2).
+ */
+ c.prog_data.base.urb_read_length = (c.key.input_vue_map.num_slots + 1) / 2;
+
+ void *mem_ctx = ralloc_context(NULL);
+ unsigned program_size;
+ const unsigned *program =
+ brw_gs_emit(brw, prog, &c, mem_ctx, &program_size);
+ if (program == NULL) {
+ ralloc_free(mem_ctx);
+ return false;
+ }
+
+ /* Scratch space is used for register spilling */
+ if (c.base.last_scratch) {
+ perf_debug("Geometry shader triggered register spilling. "
+ "Try reducing the number of live vec4 values to "
+ "improve performance.\n");
+
+ c.prog_data.base.total_scratch
+ = brw_get_scratch_size(c.base.last_scratch*REG_SIZE);
+
+ brw_get_scratch_bo(brw, &stage_state->scratch_bo,
+ c.prog_data.base.total_scratch * brw->max_gs_threads);
+ }
+
+ brw_upload_cache(&brw->cache, BRW_GS_PROG,
+ &c.key, sizeof(c.key),
+ program, program_size,
+ &c.prog_data, sizeof(c.prog_data),
+ &stage_state->prog_offset, &brw->gs.prog_data);
+ ralloc_free(mem_ctx);
+
+ return true;
+}
+
+
+static void
+brw_upload_gs_prog(struct brw_context *brw)
+{
+ struct gl_context *ctx = &brw->ctx;
+ struct brw_stage_state *stage_state = &brw->gs.base;
+ struct brw_gs_prog_key key;
+ /* BRW_NEW_GEOMETRY_PROGRAM */
+ struct brw_geometry_program *gp =
+ (struct brw_geometry_program *) brw->geometry_program;
+
+ if (gp == NULL) {
+ /* No geometry shader. Vertex data just passes straight through. */
+ if (brw->state.dirty.brw & BRW_NEW_VUE_MAP_VS) {
+ brw->vue_map_geom_out = brw->vue_map_vs;
+ brw->state.dirty.brw |= BRW_NEW_VUE_MAP_GEOM_OUT;
+ }
+ return;
+ }
+
+ struct gl_program *prog = &gp->program.Base;
+
+ memset(&key, 0, sizeof(key));
+
+ key.base.program_string_id = gp->id;
+ brw_setup_vec4_key_clip_info(brw, &key.base, gp->program.UsesClipDistance);
+
+ /* _NEW_LIGHT | _NEW_BUFFERS */
+ key.base.clamp_vertex_color = ctx->Light._ClampVertexColor;
+
+ /* _NEW_TEXTURE */
+ brw_populate_sampler_prog_key_data(ctx, prog, stage_state->sampler_count,
+ &key.base.tex);
+
+ /* BRW_NEW_VUE_MAP_VS */
+ key.input_vue_map = brw->vue_map_vs;
+
+ if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
+ &key, sizeof(key),
+ &stage_state->prog_offset, &brw->gs.prog_data)) {
+ bool success = do_gs_prog(brw, ctx->Shader.CurrentGeometryProgram,
+ gp, &key);
+ assert(success);
+ }
+ if (memcmp(&brw->vs.prog_data->base.vue_map, &brw->vue_map_geom_out,
+ sizeof(brw->vue_map_geom_out)) != 0) {
+ brw->vue_map_geom_out = brw->gs.prog_data->base.vue_map;
+ brw->state.dirty.brw |= BRW_NEW_VUE_MAP_GEOM_OUT;
+ }
+}
+
+
+const struct brw_tracked_state brw_gs_prog = {
+ .dirty = {
+ .mesa = (_NEW_LIGHT | _NEW_BUFFERS | _NEW_TEXTURE),
+ .brw = BRW_NEW_GEOMETRY_PROGRAM | BRW_NEW_VUE_MAP_VS,
+ },
+ .emit = brw_upload_gs_prog
+};
+
+
+bool
+brw_gs_prog_data_compare(const void *in_a, const void *in_b,
+ int aux_size, const void *in_key)
+{
+ const struct brw_gs_prog_data *a = in_a;
+ const struct brw_gs_prog_data *b = in_b;
+
+ /* Compare the base vec4 structure. */
+ if (!brw_vec4_prog_data_compare(&a->base, &b->base))
+ return false;
+
+ /* Compare the rest of the struct. */
+ const unsigned offset = sizeof(struct brw_vec4_prog_data);
+ if (memcmp(((char *) &a) + offset, ((char *) &b) + offset,
+ sizeof(struct brw_gs_prog_data) - offset)) {
+ return false;
+ }
+
+ return true;
+}
+
+
+void
+brw_gs_prog_data_free(const void *in_prog_data)
+{
+ const struct brw_gs_prog_data *prog_data = in_prog_data;
+
+ brw_vec4_prog_data_free(&prog_data->base);
+}
projects / mesa.git / commitdiff