src/intel/compiler/brw_compile_clip.c

   1 /*
   2  * Copyright © 2006 - 2017 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_clip.h"
  25
  26 #include "dev/gen_debug.h"
  27
  28 const unsigned *
  29 brw_compile_clip(const struct brw_compiler *compiler,
  30                  void *mem_ctx,
  31                  const struct brw_clip_prog_key *key,
  32                  struct brw_clip_prog_data *prog_data,
  33                  struct brw_vue_map *vue_map,
  34                  unsigned *final_assembly_size)
  35 {
  36    struct brw_clip_compile c;
  37    memset(&c, 0, sizeof(c));
  38
  39    /* Begin the compilation:
  40     */
  41    brw_init_codegen(compiler->devinfo, &c.func, mem_ctx);
  42
  43    c.func.single_program_flow = 1;
  44
  45    c.key = *key;
  46    c.vue_map = *vue_map;
  47
  48    /* nr_regs is the number of registers filled by reading data from the VUE.
  49     * This program accesses the entire VUE, so nr_regs needs to be the size of
  50     * the VUE (measured in pairs, since two slots are stored in each
  51     * register).
  52     */
  53    c.nr_regs = (c.vue_map.num_slots + 1)/2;
  54
  55    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
  56
  57    /* For some reason the thread is spawned with only 4 channels
  58     * unmasked.
  59     */
  60    brw_set_default_mask_control(&c.func, BRW_MASK_DISABLE);
  61
  62    /* Would ideally have the option of producing a program which could
  63     * do all three:
  64     */
  65    switch (key->primitive) {
  66    case GL_TRIANGLES:
  67       if (key->do_unfilled)
  68          brw_emit_unfilled_clip( &c );
  69       else
  70          brw_emit_tri_clip( &c );
  71       break;
  72    case GL_LINES:
  73       brw_emit_line_clip( &c );
  74       break;
  75    case GL_POINTS:
  76       brw_emit_point_clip( &c );
  77       break;
  78    default:
  79       unreachable("not reached");
  80    }
  81
  82    brw_compact_instructions(&c.func, 0, NULL);
  83
  84    *prog_data = c.prog_data;
  85
  86    const unsigned *program = brw_get_program(&c.func, final_assembly_size);
  87
  88    if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
  89       fprintf(stderr, "clip:\n");
  90       brw_disassemble_with_labels(compiler->devinfo,
  91                                   program, 0, *final_assembly_size, stderr);
  92       fprintf(stderr, "\n");
  93    }
  94
  95    return program;
  96 }