/************************************************************************** * * Copyright 2013 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 "draw_prim_assembler.h" #include "draw_fs.h" #include "draw_gs.h" #include "draw_tess.h" #include "util/u_debug.h" #include "util/u_memory.h" #include "util/u_prim.h" #include "pipe/p_defines.h" struct draw_assembler { struct draw_context *draw; struct draw_prim_info *output_prims; struct draw_vertex_info *output_verts; const struct draw_prim_info *input_prims; const struct draw_vertex_info *input_verts; boolean needs_primid; int primid_slot; unsigned primid; unsigned num_prims; }; static boolean needs_primid(const struct draw_context *draw) { const struct draw_fragment_shader *fs = draw->fs.fragment_shader; const struct draw_geometry_shader *gs = draw->gs.geometry_shader; const struct draw_tess_eval_shader *tes = draw->tes.tess_eval_shader; if (fs && fs->info.uses_primid) { if (gs) return !gs->info.uses_primid; else if (tes) return !tes->info.uses_primid; else return TRUE; } return FALSE; } boolean draw_prim_assembler_is_required(const struct draw_context *draw, const struct draw_prim_info *prim_info, const struct draw_vertex_info *vert_info) { /* viewport index requires primitive boundaries to get correct vertex */ if (draw_current_shader_uses_viewport_index(draw)) return TRUE; switch (prim_info->prim) { case PIPE_PRIM_LINES_ADJACENCY: case PIPE_PRIM_LINE_STRIP_ADJACENCY: case PIPE_PRIM_TRIANGLES_ADJACENCY: case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY: return TRUE; default: return needs_primid(draw); } } /* * Copy the vertex header along with its data from the current * vertex buffer into a buffer holding vertices arranged * into decomposed primitives (i.e. buffer without the * adjacency vertices) */ static void copy_verts(struct draw_assembler *asmblr, unsigned *indices, unsigned num_indices) { unsigned i; char *output = (char*)asmblr->output_verts->verts; const char *input = (const char*)asmblr->input_verts->verts; for (i = 0; i < num_indices; ++i) { unsigned idx = indices[i]; unsigned output_offset = asmblr->output_verts->count * asmblr->output_verts->stride; unsigned input_offset = asmblr->input_verts->stride * idx; memcpy(output + output_offset, input + input_offset, asmblr->input_verts->vertex_size); asmblr->output_verts->count += 1; } ++asmblr->num_prims; } static void inject_primid(struct draw_assembler *asmblr, unsigned idx, unsigned primid) { int slot = asmblr->primid_slot; char *input = (char*)asmblr->input_verts->verts; unsigned input_offset = asmblr->input_verts->stride * idx; struct vertex_header *v = (struct vertex_header*)(input + input_offset); /* In case the backend doesn't care about it */ if (slot < 0) { return; } memcpy(&v->data[slot][0], &primid, sizeof(primid)); memcpy(&v->data[slot][1], &primid, sizeof(primid)); memcpy(&v->data[slot][2], &primid, sizeof(primid)); memcpy(&v->data[slot][3], &primid, sizeof(primid)); } static void prim_point(struct draw_assembler *asmblr, unsigned idx) { unsigned indices[1]; if (asmblr->needs_primid) { inject_primid(asmblr, idx, asmblr->primid++); } indices[0] = idx; copy_verts(asmblr, indices, 1); } static void prim_line(struct draw_assembler *asmblr, unsigned i0, unsigned i1) { unsigned indices[2]; if (asmblr->needs_primid) { inject_primid(asmblr, i0, asmblr->primid); inject_primid(asmblr, i1, asmblr->primid++); } indices[0] = i0; indices[1] = i1; copy_verts(asmblr, indices, 2); } static void prim_tri(struct draw_assembler *asmblr, unsigned i0, unsigned i1, unsigned i2) { unsigned indices[3]; if (asmblr->needs_primid) { inject_primid(asmblr, i0, asmblr->primid); inject_primid(asmblr, i1, asmblr->primid); inject_primid(asmblr, i2, asmblr->primid++); } indices[0] = i0; indices[1] = i1; indices[2] = i2; copy_verts(asmblr, indices, 3); } void draw_prim_assembler_prepare_outputs(struct draw_assembler *ia) { struct draw_context *draw = ia->draw; if (needs_primid(draw)) { ia->primid_slot = draw_alloc_extra_vertex_attrib( ia->draw, TGSI_SEMANTIC_PRIMID, 0); } else { ia->primid_slot = -1; } } #define FUNC assembler_run_linear #define GET_ELT(idx) (start + (idx)) #include "draw_prim_assembler_tmp.h" #define FUNC assembler_run_elts #define LOCAL_VARS const ushort *elts = input_prims->elts; #define GET_ELT(idx) (elts[start + (idx)]) #include "draw_prim_assembler_tmp.h" /* * Primitive assembler breaks up adjacency primitives and assembles * the base primitives they represent, e.g. vertices forming * PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY * become vertices forming PIPE_PRIM_TRIANGLES * This is needed because specification says that the adjacency * primitives are only visible in the geometry shader so we need * to get rid of them so that the rest of the pipeline can * process the inputs. */ void draw_prim_assembler_run(struct draw_context *draw, const struct draw_prim_info *input_prims, const struct draw_vertex_info *input_verts, struct draw_prim_info *output_prims, struct draw_vertex_info *output_verts) { struct draw_assembler *asmblr = draw->ia; unsigned start, i; unsigned assembled_prim = u_reduced_prim(input_prims->prim); unsigned max_primitives = u_decomposed_prims_for_vertices( input_prims->prim, input_prims->count); unsigned max_verts = u_vertices_per_prim(assembled_prim) * max_primitives; asmblr->output_prims = output_prims; asmblr->output_verts = output_verts; asmblr->input_prims = input_prims; asmblr->input_verts = input_verts; asmblr->needs_primid = needs_primid(asmblr->draw); asmblr->num_prims = 0; output_prims->linear = TRUE; output_prims->elts = NULL; output_prims->start = 0; output_prims->prim = assembled_prim; output_prims->flags = 0x0; output_prims->primitive_lengths = MALLOC(sizeof(unsigned)); output_prims->primitive_lengths[0] = 0; output_prims->primitive_count = 1; output_verts->vertex_size = input_verts->vertex_size; output_verts->stride = input_verts->stride; output_verts->verts = (struct vertex_header*)MALLOC( input_verts->vertex_size * max_verts); output_verts->count = 0; for (start = i = 0; i < input_prims->primitive_count; start += input_prims->primitive_lengths[i], i++) { unsigned count = input_prims->primitive_lengths[i]; if (input_prims->linear) { assembler_run_linear(asmblr, input_prims, input_verts, start, count); } else { assembler_run_elts(asmblr, input_prims, input_verts, start, count); } } output_prims->primitive_lengths[0] = output_verts->count; output_prims->count = output_verts->count; } struct draw_assembler * draw_prim_assembler_create(struct draw_context *draw) { struct draw_assembler *ia = CALLOC_STRUCT( draw_assembler ); ia->draw = draw; return ia; } void draw_prim_assembler_destroy(struct draw_assembler *ia) { FREE(ia); } /* * Called at the very begin of the draw call with a new instance * Used to reset state that should persist between primitive restart. */ void draw_prim_assembler_new_instance(struct draw_assembler *asmblr) { asmblr->primid = 0; }