226 lines
6.6 KiB
C
226 lines
6.6 KiB
C
/**************************************************************************
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*
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* Copyright 2013 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "draw_prim_assembler.h"
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#include "util/u_debug.h"
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#include "util/u_memory.h"
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#include "util/u_prim.h"
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#include "pipe/p_defines.h"
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struct draw_assembler
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{
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struct draw_context *draw;
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struct draw_prim_info *output_prims;
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struct draw_vertex_info *output_verts;
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const struct draw_prim_info *input_prims;
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const struct draw_vertex_info *input_verts;
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};
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boolean
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draw_prim_assembler_is_required(const struct draw_context *draw,
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const struct draw_prim_info *prim_info,
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const struct draw_vertex_info *vert_info)
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{
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switch (prim_info->prim) {
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case PIPE_PRIM_LINES_ADJACENCY:
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case PIPE_PRIM_LINE_STRIP_ADJACENCY:
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case PIPE_PRIM_TRIANGLES_ADJACENCY:
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case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
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return TRUE;
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default:
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return FALSE;
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}
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}
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/*
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* Copy the vertex header along with its data from the current
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* vertex buffer into a buffer holding vertices arranged
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* into decomposed primitives (i.e. buffer without the
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* adjacency vertices)
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*/
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static void
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copy_verts(struct draw_assembler *asmblr,
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unsigned *indices, unsigned num_indices)
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{
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unsigned i;
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char *output = (char*)asmblr->output_verts->verts;
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const char *input = (const char*)asmblr->input_verts->verts;
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for (i = 0; i < num_indices; ++i) {
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unsigned idx = indices[i];
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unsigned output_offset =
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asmblr->output_verts->count * asmblr->output_verts->stride;
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unsigned input_offset = asmblr->input_verts->stride * idx;
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memcpy(output + output_offset, input + input_offset,
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asmblr->input_verts->vertex_size);
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asmblr->output_verts->count += 1;
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}
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}
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static void
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prim_point(struct draw_assembler *asmblr,
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unsigned idx)
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{
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unsigned indices[1];
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indices[0] = idx;
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copy_verts(asmblr, indices, 1);
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}
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static void
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prim_line(struct draw_assembler *asmblr,
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unsigned i0, unsigned i1)
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{
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unsigned indices[2];
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indices[0] = i0;
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indices[1] = i1;
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copy_verts(asmblr, indices, 2);
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}
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static void
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prim_line_adj(struct draw_assembler *asmblr,
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unsigned i0, unsigned i1, unsigned i2, unsigned i3)
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{
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unsigned indices[2];
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indices[0] = i1;
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indices[1] = i2;
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copy_verts(asmblr, indices, 2);
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}
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static void
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prim_tri(struct draw_assembler *asmblr,
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unsigned i0, unsigned i1, unsigned i2)
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{
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unsigned indices[3];
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indices[0] = i0;
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indices[1] = i1;
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indices[2] = i2;
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copy_verts(asmblr, indices, 3);
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}
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static void
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prim_tri_adj(struct draw_assembler *asmblr,
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unsigned i0, unsigned i1, unsigned i2,
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unsigned i3, unsigned i4, unsigned i5)
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{
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unsigned indices[3];
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indices[0] = i0;
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indices[1] = i2;
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indices[2] = i4;
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copy_verts(asmblr, indices, 3);
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}
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#define FUNC assembler_run_linear
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#define GET_ELT(idx) (start + (idx))
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#include "draw_prim_assembler_tmp.h"
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#define FUNC assembler_run_elts
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#define LOCAL_VARS const ushort *elts = input_prims->elts;
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#define GET_ELT(idx) (elts[start + (idx)])
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#include "draw_prim_assembler_tmp.h"
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/*
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* Primitive assembler breaks up adjacency primitives and assembles
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* the base primitives they represent, e.g. vertices forming
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* PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY
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* become vertices forming PIPE_PRIM_TRIANGLES
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* This is needed because specification says that the adjacency
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* primitives are only visible in the geometry shader so we need
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* to get rid of them so that the rest of the pipeline can
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* process the inputs.
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*/
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void
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draw_prim_assembler_run(struct draw_context *draw,
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const struct draw_prim_info *input_prims,
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const struct draw_vertex_info *input_verts,
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struct draw_prim_info *output_prims,
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struct draw_vertex_info *output_verts)
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{
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struct draw_assembler asmblr;
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unsigned start, i;
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unsigned assembled_prim = u_assembled_prim(input_prims->prim);
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unsigned max_primitives = u_decomposed_prims_for_vertices(
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input_prims->prim, input_prims->count);
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unsigned max_verts = u_vertices_per_prim(assembled_prim) * max_primitives;
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asmblr.draw = draw;
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asmblr.output_prims = output_prims;
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asmblr.output_verts = output_verts;
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asmblr.input_prims = input_prims;
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asmblr.input_verts = input_verts;
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output_prims->linear = TRUE;
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output_prims->elts = NULL;
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output_prims->start = 0;
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output_prims->prim = u_assembled_prim(input_prims->prim);
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output_prims->flags = 0x0;
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output_prims->primitive_lengths = MALLOC(sizeof(unsigned));
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output_prims->primitive_lengths[0] = 0;
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output_prims->primitive_count = 1;
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output_verts->vertex_size = input_verts->vertex_size;
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output_verts->stride = input_verts->stride;
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output_verts->verts = (struct vertex_header*)MALLOC(
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input_verts->vertex_size * max_verts);
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output_verts->count = 0;
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for (start = i = 0; i < input_prims->primitive_count;
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start += input_prims->primitive_lengths[i], i++)
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{
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unsigned count = input_prims->primitive_lengths[i];
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if (input_prims->linear) {
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assembler_run_linear(&asmblr, input_prims, input_verts,
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start, count);
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} else {
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assembler_run_elts(&asmblr, input_prims, input_verts,
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start, count);
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}
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}
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output_prims->primitive_lengths[0] = output_verts->count;
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output_prims->count = output_verts->count;
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}
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