1 /*
2 * Copyright © 2009 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
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 #include <string.h>
25 #include "main/mtypes.h"
26 #include "prog_instruction.h"
27 #include "program_parser.h"
28
29
30 /**
31 * Extra assembly-level parser routines
32 *
33 * \author Ian Romanick <ian.d.romanick@intel.com>
34 */
35
36 int
_mesa_parse_instruction_suffix(const struct asm_parser_state * state,const char * suffix,struct prog_instruction * inst)37 _mesa_parse_instruction_suffix(const struct asm_parser_state *state,
38 const char *suffix,
39 struct prog_instruction *inst)
40 {
41 inst->Saturate = GL_FALSE;
42
43 /* The only possible suffix element is the saturation selector from
44 * ARB_fragment_program.
45 */
46 if (state->mode == ARB_fragment) {
47 if (strcmp(suffix, "_SAT") == 0) {
48 inst->Saturate = GL_TRUE;
49 suffix += 4;
50 }
51 }
52
53 /* It is an error for all of the suffix string not to be consumed.
54 */
55 return suffix[0] == '\0';
56 }
57
58
59 int
_mesa_ARBvp_parse_option(struct asm_parser_state * state,const char * option)60 _mesa_ARBvp_parse_option(struct asm_parser_state *state, const char *option)
61 {
62 if (strcmp(option, "ARB_position_invariant") == 0) {
63 state->option.PositionInvariant = 1;
64 return 1;
65 }
66
67 return 0;
68 }
69
70
71 int
_mesa_ARBfp_parse_option(struct asm_parser_state * state,const char * option)72 _mesa_ARBfp_parse_option(struct asm_parser_state *state, const char *option)
73 {
74 unsigned fog_option;
75
76 /* All of the options currently supported start with "ARB_". The code is
77 * currently structured with nested if-statements because eventually options
78 * that start with "NV_" will be supported. This structure will result in
79 * less churn when those options are added.
80 */
81 if (strncmp(option, "ARB_", 4) == 0) {
82 /* Advance the pointer past the "ARB_" prefix.
83 */
84 option += 4;
85
86 if (strncmp(option, "fog_", 4) == 0) {
87 option += 4;
88
89 if (strcmp(option, "exp") == 0) {
90 fog_option = OPTION_FOG_EXP;
91 } else if (strcmp(option, "exp2") == 0) {
92 fog_option = OPTION_FOG_EXP2;
93 } else if (strcmp(option, "linear") == 0) {
94 fog_option = OPTION_FOG_LINEAR;
95 } else {
96 /* invalid option */
97 return 0;
98 }
99
100 if (state->option.Fog == OPTION_NONE) {
101 state->option.Fog = fog_option;
102 return 1;
103 }
104
105 /* The ARB_fragment_program specification instructs us to handle
106 * redundant options in two seemingly contradictory ways:
107 *
108 * Section 3.11.4.5.1 says:
109 * "Only one fog application option may be specified by any given
110 * fragment program. A fragment program that specifies more than one
111 * of the program options "ARB_fog_exp", "ARB_fog_exp2", and
112 * "ARB_fog_linear", will fail to load."
113 *
114 * Issue 27 says:
115 * "The three mandatory options are ARB_fog_exp, ARB_fog_exp2, and
116 * ARB_fog_linear. As these options are mutually exclusive by
117 * nature, specifying more than one is not useful. If more than one
118 * is specified, the last one encountered in the <optionSequence>
119 * will be the one to actually modify the execution environment."
120 *
121 * We choose to allow programs to specify the same OPTION redundantly,
122 * but fail to load programs that specify contradictory options.
123 */
124 return state->option.Fog == fog_option ? 1 : 0;
125 } else if (strncmp(option, "precision_hint_", 15) == 0) {
126 option += 15;
127
128 /* The ARB_fragment_program spec, 3.11.4.5.2 says:
129 *
130 * "Only one precision control option may be specified by any given
131 * fragment program. A fragment program that specifies both the
132 * "ARB_precision_hint_fastest" and "ARB_precision_hint_nicest"
133 * program options will fail to load.
134 */
135
136 if (strcmp(option, "nicest") == 0 &&
137 state->option.PrecisionHint != OPTION_FASTEST) {
138 state->option.PrecisionHint = OPTION_NICEST;
139 return 1;
140 } else if (strcmp(option, "fastest") == 0 &&
141 state->option.PrecisionHint != OPTION_NICEST) {
142 state->option.PrecisionHint = OPTION_FASTEST;
143 return 1;
144 }
145
146 return 0;
147 } else if (strcmp(option, "draw_buffers") == 0) {
148 /* Don't need to check extension availability because all Mesa-based
149 * drivers support GL_ARB_draw_buffers.
150 */
151 state->option.DrawBuffers = 1;
152 return 1;
153 } else if (strcmp(option, "fragment_program_shadow") == 0) {
154 if (state->ctx->Extensions.ARB_fragment_program_shadow) {
155 state->option.Shadow = 1;
156 return 1;
157 }
158 } else if (strncmp(option, "fragment_coord_", 15) == 0) {
159 option += 15;
160 if (state->ctx->Extensions.ARB_fragment_coord_conventions) {
161 if (strcmp(option, "origin_upper_left") == 0) {
162 state->option.OriginUpperLeft = 1;
163 return 1;
164 }
165 else if (strcmp(option, "pixel_center_integer") == 0) {
166 state->option.PixelCenterInteger = 1;
167 return 1;
168 }
169 }
170 }
171 } else if (strncmp(option, "ATI_", 4) == 0) {
172 option += 4;
173
174 if (strcmp(option, "draw_buffers") == 0) {
175 /* Don't need to check extension availability because all Mesa-based
176 * drivers support GL_ATI_draw_buffers.
177 */
178 state->option.DrawBuffers = 1;
179 return 1;
180 }
181 }
182
183 return 0;
184 }
185