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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 "common/gen_debug.h"
27 
28 const unsigned *
brw_compile_clip(const struct brw_compiler * compiler,void * mem_ctx,const struct brw_clip_prog_key * key,struct brw_clip_prog_data * prog_data,struct brw_vue_map * vue_map,unsigned * final_assembly_size)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(compiler->devinfo,
91                       program, 0, *final_assembly_size, stderr);
92       fprintf(stderr, "\n");
93    }
94 
95    return program;
96 }
97