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                break;
76
77            case TGSI_SEMANTIC_FOG:
78                assert(index == 0);
79                vs_outputs->fog = i;
80                break;
81
82            case TGSI_SEMANTIC_EDGEFLAG:
83                assert(index == 0);
84                fprintf(stderr, "r300 VP: cannot handle edgeflag output.\n");
85                break;
86
87            case TGSI_SEMANTIC_CLIPVERTEX:
88                assert(index == 0);
89                /* Draw does clip vertex for us. */
90                if (r300->screen->caps.has_tcl) {
91                    fprintf(stderr, "r300 VP: cannot handle clip vertex output.\n");
92                }
93                break;
94
95            default:
96                fprintf(stderr, "r300 VP: unknown vertex output semantic: %i.\n",
97                        info->output_semantic_name[i]);
98        }
99    }
100
101    /* WPOS is a straight copy of POSITION and it's always emitted. */
102    vs_outputs->wpos = i;
103}
104
105static void set_vertex_inputs_outputs(struct r300_vertex_program_compiler * c)
106{
107    struct r300_vertex_shader * vs = c->UserData;
108    struct r300_shader_semantics* outputs = &vs->outputs;
109    struct tgsi_shader_info* info = &vs->info;
110    int i, reg = 0;
111    boolean any_bcolor_used = outputs->bcolor[0] != ATTR_UNUSED ||
112                              outputs->bcolor[1] != ATTR_UNUSED;
113
114    /* Fill in the input mapping */
115    for (i = 0; i < info->num_inputs; i++)
116        c->code->inputs[i] = i;
117
118    /* Position. */
119    if (outputs->pos != ATTR_UNUSED) {
120        c->code->outputs[outputs->pos] = reg++;
121    } else {
122        assert(0);
123    }
124
125    /* Point size. */
126    if (outputs->psize != ATTR_UNUSED) {
127        c->code->outputs[outputs->psize] = reg++;
128    }
129
130    /* If we're writing back facing colors we need to send
131     * four colors to make front/back face colors selection work.
132     * If the vertex program doesn't write all 4 colors, lets
133     * pretend it does by skipping output index reg so the colors
134     * get written into appropriate output vectors.
135     */
136
137    /* Colors. */
138    for (i = 0; i < ATTR_COLOR_COUNT; i++) {
139        if (outputs->color[i] != ATTR_UNUSED) {
140            c->code->outputs[outputs->color[i]] = reg++;
141        } else if (any_bcolor_used ||
142                   outputs->color[1] != ATTR_UNUSED) {
143            reg++;
144        }
145    }
146
147    /* Back-face colors. */
148    for (i = 0; i < ATTR_COLOR_COUNT; i++) {
149        if (outputs->bcolor[i] != ATTR_UNUSED) {
150            c->code->outputs[outputs->bcolor[i]] = reg++;
151        } else if (any_bcolor_used) {
152            reg++;
153        }
154    }
155
156    /* Texture coordinates. */
157    for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
158        if (outputs->generic[i] != ATTR_UNUSED) {
159            c->code->outputs[outputs->generic[i]] = reg++;
160        }
161    }
162
163    /* Fog coordinates. */
164    if (outputs->fog != ATTR_UNUSED) {
165        c->code->outputs[outputs->fog] = reg++;
166    }
167
168    /* WPOS. */
169    c->code->outputs[outputs->wpos] = reg++;
170}
171
172void r300_init_vs_outputs(struct r300_context *r300,
173                          struct r300_vertex_shader *vs)
174{
175    tgsi_scan_shader(vs->state.tokens, &vs->info);
176    r300_shader_read_vs_outputs(r300, &vs->info, &vs->outputs);
177}
178
179static void r300_dummy_vertex_shader(
180    struct r300_context* r300,
181    struct r300_vertex_shader* shader)
182{
183    struct ureg_program *ureg;
184    struct ureg_dst dst;
185    struct ureg_src imm;
186
187    /* Make a simple vertex shader which outputs (0, 0, 0, 1),
188     * effectively rendering nothing. */
189    ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
190    dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
191    imm = ureg_imm4f(ureg, 0, 0, 0, 1);
192
193    ureg_MOV(ureg, dst, imm);
194    ureg_END(ureg);
195
196    shader->state.tokens = tgsi_dup_tokens(ureg_finalize(ureg));
197    ureg_destroy(ureg);
198
199    shader->dummy = TRUE;
200    r300_init_vs_outputs(r300, shader);
201    r300_translate_vertex_shader(r300, shader);
202}
203
204void r300_translate_vertex_shader(struct r300_context *r300,
205                                  struct r300_vertex_shader *vs)
206{
207    struct r300_vertex_program_compiler compiler;
208    struct tgsi_to_rc ttr;
209    unsigned i;
210
211    /* Setup the compiler */
212    memset(&compiler, 0, sizeof(compiler));
213    rc_init(&compiler.Base);
214
215    DBG_ON(r300, DBG_VP) ? compiler.Base.Debug |= RC_DBG_LOG : 0;
216    DBG_ON(r300, DBG_P_STAT) ? compiler.Base.Debug |= RC_DBG_STATS : 0;
217    compiler.code = &vs->code;
218    compiler.UserData = vs;
219    compiler.Base.is_r500 = r300->screen->caps.is_r500;
220    compiler.Base.disable_optimizations = DBG_ON(r300, DBG_NO_OPT);
221    compiler.Base.has_half_swizzles = FALSE;
222    compiler.Base.has_presub = FALSE;
223    compiler.Base.has_omod = FALSE;
224    compiler.Base.max_temp_regs = 32;
225    compiler.Base.max_constants = 256;
226    compiler.Base.max_alu_insts = r300->screen->caps.is_r500 ? 1024 : 256;
227
228    if (compiler.Base.Debug & RC_DBG_LOG) {
229        DBG(r300, DBG_VP, "r300: Initial vertex program\n");
230        tgsi_dump(vs->state.tokens, 0);
231    }
232
233    /* Translate TGSI to our internal representation */
234    ttr.compiler = &compiler.Base;
235    ttr.info = &vs->info;
236    ttr.use_half_swizzles = FALSE;
237
238    r300_tgsi_to_rc(&ttr, vs->state.tokens);
239
240    if (ttr.error) {
241        fprintf(stderr, "r300 VP: Cannot translate a shader. "
242                "Using a dummy shader instead.\n");
243        r300_dummy_vertex_shader(r300, vs);
244        return;
245    }
246
247    if (compiler.Base.Program.Constants.Count > 200) {
248        compiler.Base.remove_unused_constants = TRUE;
249    }
250
251    compiler.RequiredOutputs = ~(~0 << (vs->info.num_outputs + 1));
252    compiler.SetHwInputOutput = &set_vertex_inputs_outputs;
253
254    /* Insert the WPOS output. */
255    rc_copy_output(&compiler.Base, 0, vs->outputs.wpos);
256
257    /* Invoke the compiler */
258    r3xx_compile_vertex_program(&compiler);
259    if (compiler.Base.Error) {
260        fprintf(stderr, "r300 VP: Compiler error:\n%sUsing a dummy shader"
261                " instead.\n", compiler.Base.ErrorMsg);
262
263        if (vs->dummy) {
264            fprintf(stderr, "r300 VP: Cannot compile the dummy shader! "
265                    "Giving up...\n");
266            abort();
267        }
268
269        rc_destroy(&compiler.Base);
270        r300_dummy_vertex_shader(r300, vs);
271        return;
272    }
273
274    /* Initialize numbers of constants for each type. */
275    vs->externals_count = 0;
276    for (i = 0;
277         i < vs->code.constants.Count &&
278         vs->code.constants.Constants[i].Type == RC_CONSTANT_EXTERNAL; i++) {
279        vs->externals_count = i+1;
280    }
281    for (; i < vs->code.constants.Count; i++) {
282        assert(vs->code.constants.Constants[i].Type == RC_CONSTANT_IMMEDIATE);
283    }
284    vs->immediates_count = vs->code.constants.Count - vs->externals_count;
285
286    /* And, finally... */
287    rc_destroy(&compiler.Base);
288}
289