1/*
2 * Copyright 2009 Corbin Simpson <MostAwesomeDude@gmail.com>
3 * Copyright 2009 Marek Olšák <maraeo@gmail.com>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * the Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE. */
23
24#include "r300_vs.h"
25
26#include "r300_context.h"
27#include "r300_screen.h"
28#include "r300_tgsi_to_rc.h"
29#include "r300_reg.h"
30
31#include "tgsi/tgsi_dump.h"
32#include "tgsi/tgsi_parse.h"
33#include "tgsi/tgsi_ureg.h"
34
35#include "compiler/radeon_compiler.h"
36
37/* Convert info about VS output semantics into r300_shader_semantics. */
38static void r300_shader_read_vs_outputs(
39    struct r300_context *r300,
40    struct tgsi_shader_info* info,
41    struct r300_shader_semantics* vs_outputs)
42{
43    int i;
44    unsigned index;
45
46    r300_shader_semantics_reset(vs_outputs);
47
48    for (i = 0; i < info->num_outputs; i++) {
49        index = info->output_semantic_index[i];
50
51        switch (info->output_semantic_name[i]) {
52            case TGSI_SEMANTIC_POSITION:
53                assert(index == 0);
54                vs_outputs->pos = i;
55                break;
56
57            case TGSI_SEMANTIC_PSIZE:
58                assert(index == 0);
59                vs_outputs->psize = i;
60                break;
61
62            case TGSI_SEMANTIC_COLOR:
63                assert(index < ATTR_COLOR_COUNT);
64                vs_outputs->color[index] = i;
65                break;
66
67            case TGSI_SEMANTIC_BCOLOR:
68                assert(index < ATTR_COLOR_COUNT);
69                vs_outputs->bcolor[index] = i;
70                break;
71
72            case TGSI_SEMANTIC_GENERIC:
73                assert(index < ATTR_GENERIC_COUNT);
74                vs_outputs->generic[index] = i;
75                vs_outputs->num_generic++;
76                break;
77
78            case TGSI_SEMANTIC_FOG:
79                assert(index == 0);
80                vs_outputs->fog = i;
81                break;
82
83            case TGSI_SEMANTIC_EDGEFLAG:
84                assert(index == 0);
85                fprintf(stderr, "r300 VP: cannot handle edgeflag output.\n");
86                break;
87
88            case TGSI_SEMANTIC_CLIPVERTEX:
89                assert(index == 0);
90                /* Draw does clip vertex for us. */
91                if (r300->screen->caps.has_tcl) {
92                    fprintf(stderr, "r300 VP: cannot handle clip vertex output.\n");
93                }
94                break;
95
96            default:
97                fprintf(stderr, "r300 VP: unknown vertex output semantic: %i.\n",
98                        info->output_semantic_name[i]);
99        }
100    }
101
102    /* WPOS is a straight copy of POSITION and it's always emitted. */
103    vs_outputs->wpos = i;
104}
105
106static void set_vertex_inputs_outputs(struct r300_vertex_program_compiler * c)
107{
108    struct r300_vertex_shader * vs = c->UserData;
109    struct r300_shader_semantics* outputs = &vs->outputs;
110    struct tgsi_shader_info* info = &vs->info;
111    int i, reg = 0;
112    boolean any_bcolor_used = outputs->bcolor[0] != ATTR_UNUSED ||
113                              outputs->bcolor[1] != ATTR_UNUSED;
114
115    /* Fill in the input mapping */
116    for (i = 0; i < info->num_inputs; i++)
117        c->code->inputs[i] = i;
118
119    /* Position. */
120    if (outputs->pos != ATTR_UNUSED) {
121        c->code->outputs[outputs->pos] = reg++;
122    } else {
123        assert(0);
124    }
125
126    /* Point size. */
127    if (outputs->psize != ATTR_UNUSED) {
128        c->code->outputs[outputs->psize] = reg++;
129    }
130
131    /* If we're writing back facing colors we need to send
132     * four colors to make front/back face colors selection work.
133     * If the vertex program doesn't write all 4 colors, lets
134     * pretend it does by skipping output index reg so the colors
135     * get written into appropriate output vectors.
136     */
137
138    /* Colors. */
139    for (i = 0; i < ATTR_COLOR_COUNT; i++) {
140        if (outputs->color[i] != ATTR_UNUSED) {
141            c->code->outputs[outputs->color[i]] = reg++;
142        } else if (any_bcolor_used ||
143                   outputs->color[1] != ATTR_UNUSED) {
144            reg++;
145        }
146    }
147
148    /* Back-face colors. */
149    for (i = 0; i < ATTR_COLOR_COUNT; i++) {
150        if (outputs->bcolor[i] != ATTR_UNUSED) {
151            c->code->outputs[outputs->bcolor[i]] = reg++;
152        } else if (any_bcolor_used) {
153            reg++;
154        }
155    }
156
157    /* Texture coordinates. */
158    for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
159        if (outputs->generic[i] != ATTR_UNUSED) {
160            c->code->outputs[outputs->generic[i]] = reg++;
161        }
162    }
163
164    /* Fog coordinates. */
165    if (outputs->fog != ATTR_UNUSED) {
166        c->code->outputs[outputs->fog] = reg++;
167    }
168
169    /* WPOS. */
170    c->code->outputs[outputs->wpos] = reg++;
171}
172
173void r300_init_vs_outputs(struct r300_context *r300,
174                          struct r300_vertex_shader *vs)
175{
176    tgsi_scan_shader(vs->state.tokens, &vs->info);
177    r300_shader_read_vs_outputs(r300, &vs->info, &vs->outputs);
178}
179
180static void r300_dummy_vertex_shader(
181    struct r300_context* r300,
182    struct r300_vertex_shader* shader)
183{
184    struct ureg_program *ureg;
185    struct ureg_dst dst;
186    struct ureg_src imm;
187
188    /* Make a simple vertex shader which outputs (0, 0, 0, 1),
189     * effectively rendering nothing. */
190    ureg = ureg_create(PIPE_SHADER_VERTEX);
191    dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
192    imm = ureg_imm4f(ureg, 0, 0, 0, 1);
193
194    ureg_MOV(ureg, dst, imm);
195    ureg_END(ureg);
196
197    shader->state.tokens = tgsi_dup_tokens(ureg_finalize(ureg));
198    ureg_destroy(ureg);
199
200    shader->dummy = TRUE;
201    r300_init_vs_outputs(r300, shader);
202    r300_translate_vertex_shader(r300, shader);
203}
204
205void r300_translate_vertex_shader(struct r300_context *r300,
206                                  struct r300_vertex_shader *vs)
207{
208    struct r300_vertex_program_compiler compiler;
209    struct tgsi_to_rc ttr;
210    unsigned i;
211
212    /* Setup the compiler */
213    memset(&compiler, 0, sizeof(compiler));
214    rc_init(&compiler.Base, NULL);
215
216    DBG_ON(r300, DBG_VP) ? compiler.Base.Debug |= RC_DBG_LOG : 0;
217    DBG_ON(r300, DBG_P_STAT) ? compiler.Base.Debug |= RC_DBG_STATS : 0;
218    compiler.code = &vs->code;
219    compiler.UserData = vs;
220    compiler.Base.is_r500 = r300->screen->caps.is_r500;
221    compiler.Base.disable_optimizations = DBG_ON(r300, DBG_NO_OPT);
222    compiler.Base.has_half_swizzles = FALSE;
223    compiler.Base.has_presub = FALSE;
224    compiler.Base.has_omod = FALSE;
225    compiler.Base.max_temp_regs = 32;
226    compiler.Base.max_constants = 256;
227    compiler.Base.max_alu_insts = r300->screen->caps.is_r500 ? 1024 : 256;
228
229    if (compiler.Base.Debug & RC_DBG_LOG) {
230        DBG(r300, DBG_VP, "r300: Initial vertex program\n");
231        tgsi_dump(vs->state.tokens, 0);
232    }
233
234    /* Translate TGSI to our internal representation */
235    ttr.compiler = &compiler.Base;
236    ttr.info = &vs->info;
237    ttr.use_half_swizzles = FALSE;
238
239    r300_tgsi_to_rc(&ttr, vs->state.tokens);
240
241    if (ttr.error) {
242        fprintf(stderr, "r300 VP: Cannot translate a shader. "
243                "Using a dummy shader instead.\n");
244        r300_dummy_vertex_shader(r300, vs);
245        return;
246    }
247
248    if (compiler.Base.Program.Constants.Count > 200) {
249        compiler.Base.remove_unused_constants = TRUE;
250    }
251
252    compiler.RequiredOutputs = ~(~0U << (vs->info.num_outputs + 1));
253    compiler.SetHwInputOutput = &set_vertex_inputs_outputs;
254
255    /* Insert the WPOS output. */
256    rc_copy_output(&compiler.Base, 0, vs->outputs.wpos);
257
258    /* Invoke the compiler */
259    r3xx_compile_vertex_program(&compiler);
260    if (compiler.Base.Error) {
261        fprintf(stderr, "r300 VP: Compiler error:\n%sUsing a dummy shader"
262                " instead.\n", compiler.Base.ErrorMsg);
263
264        if (vs->dummy) {
265            fprintf(stderr, "r300 VP: Cannot compile the dummy shader! "
266                    "Giving up...\n");
267            abort();
268        }
269
270        rc_destroy(&compiler.Base);
271        r300_dummy_vertex_shader(r300, vs);
272        return;
273    }
274
275    /* Initialize numbers of constants for each type. */
276    vs->externals_count = 0;
277    for (i = 0;
278         i < vs->code.constants.Count &&
279         vs->code.constants.Constants[i].Type == RC_CONSTANT_EXTERNAL; i++) {
280        vs->externals_count = i+1;
281    }
282    for (; i < vs->code.constants.Count; i++) {
283        assert(vs->code.constants.Constants[i].Type == RC_CONSTANT_IMMEDIATE);
284    }
285    vs->immediates_count = vs->code.constants.Count - vs->externals_count;
286
287    /* And, finally... */
288    rc_destroy(&compiler.Base);
289}
290